text:
Is it safe to remove SD and sim card while phone is powering on and off?
i noticed someone was removing and putting in the SD and sim card while my phone was powering on and off, and i wanted to know if this is safe or if it can cause issues with the phone?
Also they were repairing my phone charging port and said that i encrypted the phone, which i never once did. So i wanted to know if these 2 things were linked or if they could of accidently encrypt it while opening the phone? I'm veryy confused

The concerned term is hot swapping
External storage (including SD card) should only be removed after it has been unmounted from the system, which ensures that no data gets to be read from or written into the device, so as to prevent data corruption and app crashes. Android supports hot swapping of external storage. However, since there is no way to fully ascertain visibly at what stage of shutdown process the external storage is unmounted, it should be removed only when the phone has powered off.
As for the SIM card, OEMs including Google recommends powering off the device before inserting or removing a SIM card. On the other hand, many Android users since Marshmallow have had success with hot swapping a SIM card just by turning Airplane mode on and off. Some phones explicitly support SIM card hot swapping, such as Samsung Galaxy S7.
Android devices since Android Lollipop comes encrypted, unless they have been exempted (see heading 9.9) owing to major performance degradation from encryption.

Great answer! But I have been able to hot swap a SIM card in Android 5.1 (Lollipop) before (although it took a few minutes to register the SIM card changes).

@Zackary, me too, but I read somewhere that people could hot swap instantaneously only since Marshmallow. :-)

I must add my voice here to say.  My SDCard works, but not in the phone, after a hot-swapping took place.  I wish the tech had turned it off, or unmounted the SDCard.  We did not notice that the SDCard quit.  I'm attempting to diagnose the SD-Card now, I've attempted many re-seats.  I can read it with my PC.


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Is there a way to change the color of the navigation bar? Or to make it transparent
Some apps change the color of the navigation bar color to their color scheme (or even make it transparent). But most of the time it remains black. Is there a way to change its color for all screens or to make transparent?
It's okay if rooting or custom ROM is needed for this.

Navbar Apps by Damian Piwowarski from play store is capable of changing navigation bar color equivalent to that of opened app color also with more customization.

@RahulGopi Good thing! But it seems to have some compatibility problems with Nova Launcher. I'll take a deeper look into the setting later.

Install GravityBox compatible with your Android version. It requires a rooted device with a compatible Xposed Framework installed. Once you install it, enable its module in Xposed Installer app, launch it, go to Navigation tweaks, and make changes which you are looking for. Master toggle listed there requires a reboot for changes to take effect.

I'll take a look.

BTW I couldn't try your proposal because that phone has some other issues incompatible with my understanding of using a smartphone, so it's going to be sold :)

source: Stack Exchange

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

sort: votes


text:
Are android system kernel panic logs available in TWRP recovery?
I am trying to debug a rom I built but can't seem to find the any kernel panic or system logs in TWRP recovery.
Is it possible to create logs for a failed boot to see whats going wrong?
I am still a total noob with this stuff so any help is appreciated!

Check /sys/fs/pstore immediately after a crash
In some cases there are no logs here as the device warm resets (it happens when a crash is serious enough to boot the device into edl). To avoid this try disabling kernel panics in your kernel.

all_licenses: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/


text:
How does Nokia automatic backup work on the new Android One devices?
My girlfriend recently got a new Nokia 6.1 device with Android One. Her last device got damaged and data was lost so I'd like to make sure this one is optimally backed up.
I'm used to backing up my iPhone to my desktop via iTunes as well as into the cloud. Is there a similar official desktop software for Nokia devices? I could find Kies for Samsung devices but no Nokia equivalent.
The Nokia 6.1 User Guide has an entry that explains how to enable automatic backups in Settings - but no further information as to how it works. You can choose a Google account to associate the backup with but this seems optional rather than required.
Does this mean that the backup data is by default stored with Nokia and just somehow linked with her Google account? And if I set her Google account as the "Backup Account" then the data will only be stored in her Google Drive?
Finally, if you choose this automatic cloud backup option would the only recovery option be another Nokia Android One device? Or would it be possible for her to get a new phone that's for instance a Samsung and restore to that device?
Any advice would be much appreciated, I'm new to how things work with Android.

I'm not an expert with this, but here's what I know.
Nokia 6.1 as with all Android One phones, runs stock Android. And the backup/restore options that you see are all part of normal Android and you will see them across nearly all Android smartphones be it Android One or not. So, the backup that is on a Google account can be restored on any other device.
Other OEMs do have a better backup/restore setup and I recommend that you ask her to do a better job at backing up stuff.
The backup setup in Android One is a barebone setup and you'll barely recover anything beyond your list of installed apps and your contacts (inc SMS and call history). Apps which automatically backup to their server or to Google Drive (like WhatsApp) are an exception. For everything else, such as files, documents, photos, videos, music, you need to back them up yourself.
Google Photos is a nice way to keep your photos from the camera all backed up. You can also consider using Microsoft's OneDrive app. For the other items, you need to either sync them to the cloud manually or use a USB cable to copy them to the PC regularly.

Thanks, this is definitely helpful. Based on you answer and other reading I've done it looks to me like the optimal approach is to enable the Android automatic backups and be very conscious about keeping everything on your SD card and backing it up via PC every week. The combination of these should keep her data pretty covered.


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Is there a command in /system/bin to wipe cache?
Is there a command in /system/bin to perform cache clearing?

If by wiping you mean erasing the contents of partition mounted at /cache, you can delete them simply from any file explorer or commandline (terminal emulator / adb shell). It needs root. Or if filesystem on your cache partition is ext4, you can use /system/bin/make_ext4fs to format the partition (what custom recoveries do usually). But it can be dangerous in some situations. Some apps save logs etc. there.


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Google Play Authenticate to complete purchase, multiple accounts
I'm using a device running Android 8.1. I'm trying to complete a purchase using Google Play where I'm facing a problem while authenticating myself after I selected my payment method. I have 4 Google accounts linked to my device. I wish to use my primary Google account to authenticate myself, yet the Google Play application picks the account I've added most recently (which is my dads').
For a few hours today and last night I have searched the internet and the settings of my phone trying to find out how I can change the account that Google Play requires me to authenticate with, but I couldn't find a solution.
Now I do have the password of the Google account that Google Play prompts me to use (because my dad gave it to me), but I do not want to use that account to authenticate as I want the purcahse to be logged/added to my own (primary) Google account.
How can I modify the behavior of Google Play so that I can choose what account is used to authenticate whilst completing a purchase?

After some searching through the Github issues I found this issue regarding in-app purchases using Android/Google Play. Neto Martin, developer at Google, states the following regarding multi accounts in combination with the in-app purchases:

The purchases are always related to the user that was selected on Play Store app when you installed the app.
  So, if an user A installs the app, all purchases will be done on it's account, even if you have the account selector in your app.

Knowing this I knew the only solution for my problem was to reinstall the app (which was my last resort as I would lose some data), making sure my primary Google account was selected, which fixed the issue for me, the app now prompts me to authenticate using my primary Google account.


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Unable to turn on Nook HD+ after third trim attempt (Cyanogenmod 10.1)
After initiating my first trim attempt, I left my device alone for a bit assuming that it might take awhile to complete the process. Upon returning to the device, however, it would not power on. After trying the basics without success (holding the power button + home button to reset, etc.), I left the device alone for awhile and later found that the device had booted itself up and was running properly again (though the trim didn't work). I trimmed again after booting up and the operation succeeded almost immediately, fixing the lag issues I was having.
It's now about a month later and I attempted another trim which froze my device (no screen activity, system clock unchanging). After about 15 minutes of waiting for a change, I powered down the device, plugged it in, and went to sleep. Attempting to power the device on has been impossible, and plugging in the charger simply shows a green light (even after unplugging the device for awhile). If I hold the power button for about eight seconds, the green light turns off until I press the power button again.
When plugged into my PC via USB cable, Windows continually sounds the device connect and disconnect jingles and says "the last USB device you connected to this computer malfunctioned, and Windows does not recognize it." This stops if I hold the power button as previously mentioned.
After leaving it alone for awhile, I found that the device had randomly powered on, but was stuck at the initial Nook loading screen. Powering it down left me in the same position as before.
I'm all ears if anyone has a clue on how I can proceed, or where I can ask for knowledgeable support. Thanks!


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In Android, got click-jacked into clicking "Allow" for a pop-up that flashed for 0.1 seconds. How do I find out what I allowed?
In Android, I was using Google Chrome. I clicked on a sketchy website which popped up a new chrome tab. I pressed the tabs button which caused me to view the various tabs. Right as I was clicking on an "X" of the top-most tab, a pop-up appeared with the "Allow" button exactly under my index finger so I accidentally pressed "Allow". I had no idea what the pop-up said, except that there were two blue word buttons, and I clicked the right-most one. What did I accidentally allow and how do I disable it?

Impossible to say for sure without knowing what "sketchy website" this was (and even then, as they might have changed that). Best guess would be something like accessing location or microphone – or, contempory (GDPR), to flood you with cookies and trackers.

Check your mobile balance first. You may have been tricked into WAP billing.


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Network and Call not working in particular region, mobile settings issue
I am using Redmi Note 4 and Jio sim.
My internet and calls are not working inspite of network available. Other people living near me is able to use internet well at that place.
When I move about 70 meter away from my home, internet and calls are working quite fine. Internet and calls are working everywhere, except at my home. Means problem is under particular tower.
At my home, I changed my sim card and inserted in my friend's Redmi note 4 mobile, my internet and calls started working fine. But her jio sim inserted in my Redmi note 4, then it is not working. It means, problem is not in SIM card  but in my mobile setting.
Tried Solutions:
I thought I messed up in ##4636## settings, but I have no options to make it default setting. So, In mobile setting, I made default network setting.
Final solution:
I formatted my mobile completely, three times, so that all settings get as it was in new mobile. But still the problem is unsolved.
Please let me know, what should I do ?

Please try to add APN settings of jio of the mentioned second phone into your phone and check.


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How to back up notes taken with Samsung Notes app?
I'm using my Samsung Tab 2016 P580 for taking lecture notes. I used the Samsung Notes app, and now, my device is running out of storage. Furthermore, I can't access the notes from my PC.
I have a 32GB storage card that can't function as Internal storage. I am looking to back up my notes and I do not have a rooted device.
Do you have any idea how to solve the problem?

Your question isn't clear. How do you know your storage is full? Why and how you connect your device to PC? Is 32GB internal storage or external sd card? What does it mean by "can't function as an internal storage"? Are you talking about adaptable storage?

@IrfanLatif I got an alert from the system. Via usb. I have 16GB internal and 32GB in an sd card... Yes, it means I want to use it as an adoptable storage.

Use other applications that allow synchronization with other devices via your account. So in this case nothing is stored in your local storage and you can also access your note from other devices(Just need to login to their service).
My recommendations are:

Microsoft OneNote
Evernote

Thanks but I need to backup my previous notes... For this, do you have any idea? I don't have root...

Every version of Samsung Notes I have seen is completely lacking export functionality.
Unfortunately, without root, you have to manually cut and paste every note individually to another app.
It's a lesson I learned the hard way, and I now recommend avoiding Samsung apps and any apps they force-install on their devices.


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Fastboot unlock failed
I have a Nokia 6 and whenever I try to unlock my device I am facing error.
The command
sudo fastboot oem unlock

The result
(remote: oem unlock is not allowed)

Any suggestions?

Nokia phones do not currently allow unlocking of the bootloader. So, you cannot unlock the bootloader even if you have enabled "OEM Unlocking" in Developer Options.
It doesn't unlock because Nokia Mobile has locked them with an encrypted key and it is needed to gain temporary access of complete a full-unlock of the bootloader.
There is an unofficial (and paid) method available which you can use if unlocking is important for you.
Nokia/HMD are also showing some signs that they will allow unlocking of the bootloader. Official unlocking is enabled for Nokia 8 device owners and chances are that this will be expanded to the other phones in the future.

can i unlock it if i flash stock nougat firmware because it is written that they have implemented this in August 2018 security patch

@BhavukSharma With August 2018 release, they blocked the unofficial unlocks. So, yes, if you flash Nougat, you can unlock if after purchasing that unofficial key :)

HMD has not yet allowed the bootloader unlock of Nokia 6, so you have no chance :(


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WhatsApp using microphone in the background
Got a notification today that whatsapp is using microphone while not using the phone.
To view it again I got under  settings/lock screen/app permission monitor/permission history and during the day whatsapp used contacts several times.
I am using samsung s7 (sm-g930p), running on android 8.0.0 (august 1 2018 security patch level)
Can someone explain what is happening? Is anyone else experiencing this?

The contacts are accessed at regular intervals to look for any new numbers that may have joined/left whatsapp. But the microphone thing is really fishy.

cmon @harpratap, I was crossing my fingers for a good news.. however, I uninstalled/installed and updated it again, now its not requesting the mic anymore. I hope they had a bug and fixed it..

fixed it like "Android sys can't detect them anymore" lol

A bit off topic, but how do you reach the permission access history?

@YoavFeuerstein settings/lock screen/app permission monitor/permission history


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Moved files within Internal Storage and file can't be accessed from android
I have Moto G S5 (Android 8.1). I connected it to my laptop (Ubuntu 18.04). I moved some files (about 4 Gb) from a folder in internal storage to root folder of the internal storage.
Transfer happened succesfully. But the File manager of android doesn't show those files in the root folder. And I can access those files from my laptop, but when I try to open it. It shows Unknown MTP error. The SD card capacity when viewed from Android has decreased by 4 Gb (same as those files), but when I see the SD card capacity through Ubuntu the capacity remains intact.
Please suggest me some steps to recover those files. I tried copying those files back to the original location, but I get the same MTP error.

raw ideas: a) use a terminal emulator or b) adb shell to gain shell access, then use the mv command to move the files back to their original location. I wouldn't trust MTP farther than I can throw my house. To my experience, the adb shell approach has the best chances (even better if you have root access).

@Izzy Isn't adb a tad slow when transferring big files, though?

@DeathMaskSalesman compared to MTP? ROFL And then, OP wants to move files within the device, so that's not relevant (it's no adb pull – though in my experience, even that is faster than transferring via MTP (but then again, what is not?))

@Izzy Can't argue with that. I still don't get why Google picked MTP to begin with.

@DeathMaskSalesman if you just got your first Android device ever, without any "depth knowledge" in advance, and plugged it into your computer – what would you end up with? Besides, Nikhil is lucky he didn't try that from Windows and lost all those files, if that bug wasn't yet fixed …

@Izzy Ah, "that" bug. I don't even want to remember.

@DeathMaskSalesman I was never affected. Don't use either MTP nor Windows :)</OT> // Nikhil: Have you tried that? If you have no idea about ADB, our adb tag wiki will be a good start.

@Izzy I'm using neither as well, starting from that day.

@Izzy Thanks for the guide. I would go through it. It previously sounded complicated.

@Nikhil once you got the knack it's easy (I use it almost daily, so I might be prejudiced). The only troubles are drivers (when you're on Windows), and then maybe getting the device properly detected for the first time (not hard either if you know how). A little self-promotion: my article ADB for end-users might help getting you interested to dig-in – and started :)


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Full circle with symbol like smiling mouth in notification bar
Does anybody know, what is this icon in the notification bar in the top left corner?

I saw it on screenshot, thats why I cant check it on my mobile phone.
Thanks.

Finally I found it. Its Android application - Breaking News notification icon.

Which breaking news application? What is the name?

"Breaking News" is the name of the notification icon.


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My rooted samsung galaxy s4 is soft bricked, Can I save it?
The device has been rooted since shortly after I bought it new years ago. I've had very few problems since... which is why it's never been replaced.
When I start the device it gets stuck at the splash screen with the sprint logo.
I can get the device to "download mode" but I don't know what to do once there and I'm not sure I can do anything from here.
I can get the device to "android system recovery."
I've wiped the "cache partition" but the problem remained.
I'm not sure what else to do from here.
I'm trying to salvage the data on the internal storage.
I'm pretty sure I could successfully "wipe data/ factory reset" and get it to "function" again but that's not the priority.
I'm going to replace it regardless of success or failure.
Data recovery is the priority here. (pictures and videos of my young children as well as less important stuff.)
I have an old laptop with an old version of ubuntu I can use or a newer one with windows 7 to work with. I mention this in case it makes this easier to help?
Thank you very much if you try to take a stab at this or refer someone that might!

I cannot really answer that. But as you don't know what to do in download mode (which is most likely where your solution lies), take a look at our odin tag wiki – as that's what download mode is for (Odin operations).

And after you've looked at that tag wiki, you need to flash a custom recovery (TWRP) from where you'll be able to backup your /data partition (the one wiped during a factory reset). If your phone supports an external SD card, I also suggest copying the contents of the internal storage to said card.

@Izzy Thanks I managed to figure that out last night and used Odin to reinstall TWRP.  I did have it at one point.

@DeathMaskSalesman I managed to figure that much out, see my comment from a second ago.  The problem I'm running into now is that my data partition and internal storage can't be mounted because they're encrypted. I'm using the latest version of TWRP 3.1.x but it doesn't offer me the option to enter a password.  It just won't allow access to the partition.


text:
first time trying to install custom ROM on Samsung Galaxy Win (SHV-E500L)
I have an old Samsung Galaxy Win (SHV-E500L) Korean version (Android 4.4)
 which I want to experiment on
I searched for custom ROMs for this model online but I haven't been able to find any
I am thinking of risking it and trying custom ROMs for The E300 phones (they are Galaxy S4 phones if I understand correctly)
One of the things I have read is that installing ClockworkMod is the first step to installing custom ROMs, and the wikipedia for ClockworkMod says it

...replaces your Android device's stock recovery image. Using this
  recovery image, various system-level operations can...

What are the risks associated with doing this? At the moment I can go into recovery mode on this phone by pressing home+volume up+ power button simultaneously. Does ClockworkMod replace this built in recovery mode? If it is, is there a way to get it back in case something goes wrong? I have used Odin to download stock firmware on this phone before. Ideally, I want to be able to do it again multiple times and get it back to it's factory condition if something goes wrong.
If I manage to get ClockWorkMod on this phone, will I still be able to get the phone back to it's default settings using Odin and stock ROM in case something goes wrong? I do not have any special hardware for doing this so ideally any problems with the phone should be fixable through the standard USB port. The deice will not be used as a phone and only be used for it's camera and wifi.
Some details about the phone:
These aren't probably important details, but would still like to point them out. This phone previously had a problem where it would boot up to the telecom company logo but not go any further than that. The Download mode was still working so I managed to use Odin to download the stock ROM and the phone worked worked normally after that, but there were many background processes that would suddenly stop, giving an
Unfortunately, xxxx has stopped working

error box. This happened especially more frequently with Samsung Touch Wiz (which was fixed by installing Google's launcher) but started happening later on with other system apps as well. The problem happens more frequently if resource heavy programs such as games are run on the phone, but doesn't happen as much if it is just used for basic internet surfing and youtube from the browser. I am assuming there is some kind of problem with the phone's RAM related hardware, so I'm hoping that downloading some lite weight custom ROM without any bloatware will make the device run more smoothly.

If You have stock rom,pc and odin then you can retain device to normal state as restored if you flash cwm or twrp you can still get your default recovery from Stock rom but don't flash wrong rom it might brick your device so be careful.


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How to keep playing online videos when screen is locked?
I want to listen to online videos with my mobile phone in my pocket, but there is always something to touch the screen and interrupt the stream.
The only solution I know is to download and save the broadcast or video on my phone before listening to it with a video player app which can be screen locked.
The issue is that I don't want to download any YouTube video before listening to it, so I'd like to find a way that can keep screen locked while playing a video.

You can try to use an alternative to the default YouTube app, a popular choice being NewPipe. Although I haven't tested this myself yet, one of the listed features is being able to play videos in the background - even just the sound, without having to waste battery by displaying something you dom't actually care about.

There is a solution, if you want to listen YouTube song even when your android phone is locked. To do that you have to use chrome browser in android phone. Open YouTube in chrome browser and request as Desktop Site and search for the song which you want to listen then minimise it. The song will be paused then, from the notification you can tap on the play(▶). By doing this you will be able to listen YouTube videos in your phone even if it is locked.
I hope this will help you.

There is no way you can play a video on YouTube and lock your phone or minimize the app (in case you are using its mobile app) unless you subscribe to YouTube Premium. https://www.youtube.com/premium

Wow, I wouldn't have thought of that option... youtube app with premium ? That said I followed your link, and it says YouTube Premium is not available in your country... So it's a definitive no no. I don't understand why mobile developpers put such obstacles in the way of usability !

To make money. LOL

@user276692 That's because YouTube is sponsored by the ads and when you run videos in the background, the ads are less effective as the advertiser expects you to watch it and probably also interact with it. So, to protect itself (Google) and creators from lost revenue, and to stop advertisers from turning furious, Google does it.

Firefox for Android had that ability. Due to Google making some requirements, it was disabled, but there's an addon which you can install in a second and that's all you need to continue playing YouTube in the background or when the screen is locked.

Download Firefox for Android
Install Video Background Play Fix addon.

Firefox should be able to continue playing videos after you have installed the addon and enabled it. Just to ensure that if your phone has a background activity manager (which kills background apps), you should whitelist Firefox so that it continues to work in the background.

Try Youtube Vanced. You can listen to any video while your phone's screen is locked.


text:
Android free space decreasing
Why are apps or cache constantly bloating in space in my android 5.1.1 device?
Every time I update & use an app it bloats especially if it connects to internet.
I have to free cache every 4 months after which free space is around 1.5 GB & then after 4 months it decreases to around 400  MB.

As every time you use any app, their is some caches for each sessions which is saved by app in device memory like if you are using Instagram it stores some of your starting posts in your device memory as caches for offline view. So as you clear your cache every time, device clear all the temporarily saved data and when you starts again using that app, it again saves some cache for your easy handling of app in offline view. So that's why your memory is decreasing


text:
Set up Google Play for restricted user accounts
i have a Samsung Galaxy Tab 4, running Android 5.0.2
I'm looking for a soluton to the following issue:
All of my family is using the tablet.
So i set up accounts for an admin, and personal accounts for me and my wife, linked to our Google email adresses.
I also set up restricted accounts for the kids. (They are not linked to any email as i remember)
Now one of the kids plays Clash of Clans. Game has been installed on the admin account, and authorization given so it can be used on the kids' restricted account.
It would be cool if the kids could use Google Play to save his game progress online.
But i'm struggling to find out how to set this up.
Currently, Google Play is installed and given access to the kid account.
From kid's account, i can launch Google Play, then launch CoC.
But the button "Google Play Sign In" in CoC does nothing. (It stays red, saying disconnected).
Seems it is still not recognized.
Do i need to have an email address for the kid?
How do i link it to the restricted account?
If this doesn't work, is there any other way i can achieve this?

Follow Following steps:-

First you have to make a gmail id for your kid.
Then open clash of clans and in settings use connect to supercell id follow this video https://m.youtube.com/watch?v=D7zX0kETazA]
After connecting your kid account is connected to supercell id means id is backup online.
Now uninstall clash of clans from admin account and open your kid account and download again in that account from play store.
After install in his account just reconnect to supercell id by using newly created gmail.
They will send sign in code on Gmail open gmail app and account in which you have backup his account copy that code and enter in game.
Now all done nothing is connected to your admin account and clash of clans has ended support to Google play games.

But Still If you want to connect to Google play use following steps:-

Create a new Gmail id then.
Open clash of clans and go to settings double click on Google play button.
An menu will pop up which shows you all accounts that you have in your device.
Just select newly created gmail which is created for kid all is done.
Uninstall clash of clans and logout admin account.
Open kid account download again From store and reconnect to Google play by double tapping on Google play in game settings and select newly created gmail account.

He will got his progress back any questions are most welcome.


text:
How to edit this name in Samsung Android Phones

How to edit this name in Samsung Android Phones

You can't. That is the default name for your Cellular Modem. For more information, check this out: What is CP and AP and what are these options used for?

many person doing this why i ask here


text:
Disable "open with" in chrome
How do I disable the "open with" feature in chrome on android? An alternative would be to have chrome itself in the list of alternatives.

Can you please rephrase the question as it is unclear. Do you want to stop Chrome opening web pages by default, and instead prompt you how you want to open a link?

No, but I want the option of opening a link in chrome itself.

Does it currently open somewhere else? You can set your default apps in Settings > Apps.

I am only getting the option to open some links using external apps even if chrome would be able to open them itself.

When you have an app installed which is a dedicated app to handle certain links, you'll be given options how you want to open it. Example, if you have twitter app installed and you tap on a twitter link, it can sometimes ask you where you want to open it. You can set them in Settings > default Apps > Opening Links and set "Open supported links" to "Don't open in this app".

I know all of this. The problem is that I cannot open those links in chrome, given the options presented.

Apps has an option as 'In-App Browser' which enables an app to open links within the app and it can be disabled by disabling 'In-App Browser' in that particular Settings of App.
For another thing like clicking twitter links, for ex-  'https://t.co/something' we have two ways either clear default app in settings that enables system to ask you from which app you want to complete this task or copy the link(s) and open it in browser itself.


text:
Persistent Problem: Internet may not be available
I have a J7 (SM-J730F/DS) and noticed a while back that I can connect to WiFi but that on some networks I got the message "Internet may not be available" .... and it wasn't. This message started to appear more and more frequently and on a trip last week I could not connect to any airport, hotel or other WiFi network, with the exception of 1 network at the conference center. Upon return home, I now also get the message at home and at work. Using data roaming to get on the net is not a  problem.
I searched the web and found a number of potential fixes. I did the following:

Reboot (didn't solve it)
Forget network, then retry (didn't solve it)
Switch to static IP (didn't solve it)
Changed time/date and then back (didn't solve it)
Cleared Cache Partition (did't solve it)
Factory reset (didn't solve it)

I'm now out of ideas. Anyone any suggestions?
Thanks.

Turn off automatic updates. Google Play throttles the network.

That seems more like a comment, especially because it appears to be a wild suggestion instead of a carefully considered solution. Can you tell us how automatic updates from Google Play are linked to the problem?

Honestly, this is a bold (and scary) statement if Google Play indeed throttles the network (why, though?). We need more credible references for such a bold statement like this.

What are you saying? Of course they throttle it. All isps throttle requests when overloaded. It's just server and bandwidth management.
As to references, I'm simply commenting on my experience. Almost every time I update an app larger then 30mb, the network drops out. It only happens on Google Play.


text:
Swiftkey Keyboard uses too much space
Keyboard application uses 845 MB of my phone data which is really too much.
I want to delete data, but I am afraid that I will delete words predictions too.
Is there any solutions for me? Maybe there is option to decide what will be deleted. Cache memory is only 300 kb. I tried to move app to SD card but that option moves only application not data, and I started getting message that SwiftKey stopped working. After moving it back, works correctly again.
Hope someone can help me,
tnx

I have been using SwiftKey for a few years now and have a large dictionary. Still, my data size is some 17MB. Yours at 845MB is enormous, and this is likely due to some bug/error inside the app.
Here's what I can recommend:
Open SwiftKey and go to Account > Backup & Sync.
Here, ensure that you are backing up your SwiftKey account to Google account, Microsoft or other available options. This will ensure that your dictionary and learned words are synced to the server, and hence the learned words are connected to your account.
At this point, you should be safe when you delete the SwiftKey data and/or re-install the app. After the initial setup, you will be asked to log in to an account, and if you log in using the same account, your dictionary will return. This time, with a much smaller size (expected).
Check that your backup exists and your dictionary is synced:
If you want to confirm that your dictionary is backed up before deleting the data of SwiftKey, you can install SwiftKey Beta and then login using the same account. Now start typing and see if you are getting the predictions as expected. If you do, all is good, and you can delete both apps, re-install stable SwiftKey and have fun.


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Can I use my android phone as finger print, webcam, and mic for my windows 10PC?
I suppose I can buy a mic, a webcam, and a finger print censor for my windows 10.
But I have all those in android phone already.
Is there an easy way to do so?

As for the camera and mic part,
If you simply search the web for phrases like "use Android camera/mic on PC", you will come across many apps; some of them actually do the job.
I have used an app called DroidCam in the past which had worked for me in Windows 7 after a litte bit of struggling. (I have never tried it in Windows 10, though; but I guess it should work)

As for the fingerprint reader part,
There is not a solution which can be assured to work flawlessly. But there are some things which might be helpful :-

Dynamic Lock by Microsoft — If you are simply looking for a solution to unlock your PC using your phone, then this might be the solution for you. Although it doesn't specifically use a fingerprint unlock, it allows you to keep your PC unlocked when your phone is close enough and reachable via Bluetooth.
Third-party solution — There is an app called Remote Fingerprint Unlock which is slightly complicated to set up but will do the job for you.
Samsung Flow — If you happen to have a Samsung Android phone, then this solution from Samsung should work for you.
This app has also been ported to non-Samsung devices by some developer(s) but the Fingerprint unlock functionality does not work on non-Samsung devices yet.

(Mentioning the below content just for the sake of completeness; doesn't answer this question)

Google Smart Lock for Chromebooks — This is a solution provided by Google to unlock your PC with a fingerprint scanner on your phone. However this only works on Chrome OS (v71+) and not on any other OS.

chrome os? PC running on chrome os? Something besides microsoft?

Sorry, I didn't quite understand what you are asking.

As for the Chrome OS part, I have specifically mentioned that this solution does not apply to your question. I have mentioned it just for the sake of completeness.
With a PC running on Chrome OS, I was referring to both – Chromebook and Chromebase.


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Why my DCIM folder is empty seen in the computer but not empty in the phone
I am using HuaWeiNova device, and I tried to access it with aft-mtp-cli.
$ aft-mtp-cli
$ ls DCIM/

I got folders listed here:
|-photos
|-Camera
....

When I tried to list or download my photos in the Camera/ folder, I got nothing. Only the empty folders are listed and the folders that contains files are not shown at all. I am quite sure my photos are stored in the Camera folder in my cell phone. How come I could not access my photos with my computer ?

Maybe your photos are on the sd card, but you show internal storage?

Related: Why does MTP show wrong directory location?

For accessing your Android device via USB in "File Transfer" mode your computer uses the MTP protocol. This protocol allows to list and read/write the files from/to your device.
What most people don't know is that the MTP protocol does not show the content of the file-system. Instead it uses the Android MediaStore Database (an SQLite database) which is populated by the Media Provider, a special daemon running on Android (app package name: com.android.providers.media).
If you create a new file/directory or delete something without notify this daemon the database and the file-system are out-of sync and you end up that you can see files already deleted or can't see existing files.
You can force the Android MediaStore to refresh it's database.
There are three way to do so, just pick one of the following:

Reboot your phone

Use one of the multitude of apps that can force a rescan of the sd-card

Only for Android 4-7: Use the following ADB command-line (source):
adb shell am broadcast -a android.intent.action.MEDIA_MOUNTED -d file:///sdcard

Resetting MediaStore Database
Some times it can happen that the MediaStore database is corrupted. In such a case open the app info page of com.android.providers.media (enable "show system apps") and clear storage of this app. Afterwards reboot the device.
After reboot login using your password/pin/pattern so that you can see the launcher. Then leave the device alone to regenerate the media database. This can take some minutes or hours depending on the number of media files you have on your phone.
If that still not resolves the problem of missing files and folders then may be you have a corrupted media file on your phone that prevents further scanning of the media files. In such a case you first have to identify the corrupt file and remove or repair it.

For Android 8 and above that adb command would not work. See my answer https://android.stackexchange.com/a/200785/96277.

@Firelord Thanks for the info. If I draw the correct conclusion from your tests an Android 8 an updated app that sends this broadcast with an File object should work, right? And from my experience on Android 9 the MediaStore usually auto-updates the database so that there is no need for manually triggering an update.

Sorry, I can't interpret that conclusion for some reason, so can't comment on it. // I did come to know from you sometime ago that Android 9 automatically auto update the database so there is no need for a manual trigger. I had updated my answer there because mediaserver can be crased by an app (happened by an Xposed module) so an alternative solution was needed. In normal circumstances, yes, nobody would need to resort to command-line solution at all. So your answer is all good now. :)

Well rebooting used to do that on Android 7.

@Firelord how is this guy doing it so in this video https://www.youtube.com/watch?v=GitMOYdsA9I  where he shows here https://i.imgur.com/9gou0yT.png  windows explorer showing lots more folders than just DCIM and Pictures,  ?!

@barlop Android devices typically show all folders. Even modern Android 11 devices do. If your device does not show then something is wrong. Clear app cache of com.android.providers.media, reboot the device and wait some hours (depends on the number of media files you have).


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Unable to install PyCrypto
I'm installing PyCrypto because it is a dependency of another package. The installation always ends in an error in Termux (pip install pycrypto):
Command "/data/data/com.termux/files/usr/bin/python -u -c "import setuptools, tokenize;__file__='/data/data/com.termux/files/usr/tmp/pip-install-ip9yqged/pycrypto/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /data/data/com.termux/files/usr/tmp/pip-record-_ac102nh/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /data/data/com.termux/files/usr/tmp/pip-install-ip9yqged/pycrypto/

The other Python packages have so far installed succesfully.

PyCrypto uses C code that needs to be compiled when installed. Therefore you need a fully working C compiler/build environment (e.g. gcc/clang plus tools and develop libraries and headers).

Try installing a C compiler like Clang provided by Termux:
apt install clang


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Missing storage space in Android 7.0

Where did all the missing space go? I've deleted most of my apps, but no matter how much I get rid of it keeps saying I'm almost out. The stuff I have accounts for 3.5 GB-ish, but there's lots that seems to have disappeared. The version is Android 7.0; the phone is a Samsung Galaxy S5.
What's going wrong here?

You added the tag storage to your question, and there are nearly 500 questions associated with that tag. Have you investigated those, even only the ones with accepted answers? Hover over the tag and click the link view tag to take you to a list of related questions to explore.

How disk space is used on Android device?

Never seen this before!
Anyways here is the steps i would do:
1. If you are sure that the 15.9/16GB is wrong, e.g you know you haven't got that many apps/videos, then proceed to step 3.
2. If you know you have got like more than 50 apps or really many videos, take some time and delete videos/apps (of course images, otger files too) that take much storage.
3. Go to Setting > Device Mainteance and then clean everything you can (optimize the phone)
4. If that doesn't work go to like a phone reparator and check what they can do.


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Is it possible to save an encrypted data partition so that I can decrypt it later?
I have a rooted samsung galaxy s4 sph l720 with an encrypted data partition.
It's currently a soft brick.
I'm confident I could wipe the device and start over from scratch but then I'd lose everything in my internal data partition.
I have TWRP installed and the data partition reads as 0mb.
I know the password to access the data from the normal ROM startup but that's not an option in TWRP recovery.
I don't really care if I salvage the device. I have another device functioning as a phone right now.
I just can't believe there's no way to save this data.
Does anyone have any suggestions?

I have seen TWRP versions that ask for the FDE password and allow to access the encrypted data. May be there is also an updated TWRP version for your device available?

Thanks for the reply. I'm using 3.1.1-0 which as far as I know is the latest version for my device.  It is over 5 years old.

@Robert This version is the one provided for this device at the TWRP website so I believe it's the most up to date one. https://twrp.me/samsung/samsunggalaxys4sprint.html

Just copying the files and knowing the password likely won't be enough. I haven't done much with FBE but it likely also requires additional files with metadata. Without those the encrypted  files would be useless.


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WhatsApp keep loosing internet connection
After I force stop it, and restart whatsapp, every thing works as expected. in five minutes again, it stops working. If I do force stop and restart it, it again starts working.
I do not change anything or even touch the phone, no other apps are running, even I did factory reset and installed only whats-app, nothing else, but the behaviour is the same, I changed sim card, or wifi network, but nothing seems to change, even as last resort system update to 8.1 didn't change the behaviour, it works and suddenly stops and start working after force stop.
only that behaviour is consistent.
my question is, how to diagnose this ? or solve this ? all ideas are welcome including changing the damn phone. :)

Troubleshooting
Most connection issues can be resolved by doing the following:

Restart your phone, or turn it off and on.
Update WhatsApp to the latest version available on the Google Play Store
Open your phone's Settings > tap Network & Internet > toggle to turn Airplane mode on and off.
Open your phone's Settings > tap Network & Internet > Data usage > toggle to turn Cellular data on.
Open your phone's Settings > tap Apps & notifications > App info > WhatsApp > Data usage > toggle to turn on Background data.
Open your phone's Settings > Network & Internet > Wi-Fi > toggle to turn Wi-Fi off and on.
Try connecting to different Wi-Fi hotspots.
Make sure Wi-Fi stays on during sleep mode.
Reboot your Wi-Fi router.
Contact your mobile provider and make sure your APN settings are configured correctly.
Upgrade your Android operating system to the latest version available for your phone.
If you're having trouble connecting to WhatsApp while on a Wi-Fi network that you don't normally connect to, contact the network administrator.
If you're on a campus or corporate Wi-Fi that has firewall restrictions in place, contact the network administrator.

WhatsApp isn't designed to be used with proxy or VPN services, so we can't provide support for those configurations.


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Google calendar doesn't sync
I use google calendar and one of my calendars within google calendar does not sync to my android phone. The calendar shows in google calendar, and syncs correctly with my desktop software (Fantastical for Mac). On my phone, I can see the calendar under Settings > Accounts and Calendar folders, but the calendar is greyed out. So the phone know that the calendar is there, but is not downloading the events. Does anyone know how to 'activate' this? (NB I have quite a few calendars withing Google calendar. Is there an upper limit?)
Thanks
(PS Device = Blackberry Keyone).

I know this is old and you may have already found a solution but I ran into something like this today (on my BB Keyone) and solved it by simply un-checking and re-checking the relevant calendar account. Doing so caused the greyed out calendars to begin to sync to my phone.

My "sync now" button was grayed out and it didn't sync for weeks. It turns out I had a power saver mode on and that was causing the problem. I had to turn off power saving and the "sync now" turned on and it auto-synced.


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Factory Reset, Google Photo's recovered old photos
Recently purchased a Oneplus One second hand from eBay.
It was factory reset by previous owner, and it has since been factory reset by me a couple of times.
I have setup Google Photo's today and it's pulled in all my photo's like it should. However, it has also resurfaced all the previous owners photos and is currently backing them up to my Google Photos account!
When i look at the info on the images, it seems it's dragged them in from 'storage/emulated/0'
I wouldn't normally be bothered by something like this but these photo's contain enough information for some serious fraud/identity theft!
I have pictures of addresses, passports, credit cards, tax bills ....
How is this possible? Surely a factory reset should wipe all data?
For clarity, the phone is running stock Android 5, but is rooted (supersu) and running TWRP (both installed by previous owner).

storage/emulated/0 is what often is referred to as "internal SD card". A factory-reset leaves that untouched – unless it has such an option and you select it (e.g. twrp recovery offers that).
Which means, you have to explicitly clear that storage – or all files stored there remain there. Which obviously was the case with your device: neither the previous owner nor you thought to delete the internal-sd card. If you "explore" it (e.g. using a file manager app, or by connecting the device via mtp using an USB cable) you will most likely find many other files from the previous owner still existing there: data apps have stored, photos, screenshots and more.
If you want to erase contents of the internal or external SD card, you fine the corresponding "buttons" in Settings › Storage.

A factory reset deletes the files on your internal memory, but does not secure delete them - or delete anything on your internal SD card.
When you press "Factory reset", it quick formats /data/ and /cache/. If you select "Also erase the SD card", then the internal SD card will be erased too.
If they can still be found with Google Photos after selecting the option to erase the SD card during a factory reset, try going to Settings > Storage and then select "Erase SD card".
If you really want to fully erase everything, use a secure delete program (it will fill the internal memory with a file filled with 0's and then delete the file), so you can't recover deleted files.

It's not the "traces of deleted files". It's the "internal SD card" not being erased at all when performing a factory reset unless such an option is available and selected (neither the external). Google Photos may do many things, but it for sure doesn't undelete erased files.

Surely this is a big security risk? with the type's of data people are keeping on their phone's why wouldn't the factory reset option (that to the layman wipes 'all' data) wipe everything in a secure fashion?
Is this an older Android thing, or is this still the case in newer versions?

@BarryJarvis it was not my design decision. I was as confused as you when I found that out first. But thinking about it, it makes some sense: if you have trouble with your device you cannot solve yourself, service hotlines of the manufacturer always recommend you a factory-reset before asking you to send in the device. Sometimes that solves the issue. Data on the card shouldn't affect those issues, so they are left untouched in such cases; if you want to erase them, there's an option to do so in the storage settings (will update my answer with that).

@Izzy I updated my answer to descibe how to format the internal SD card, instead of the internal storage.

@Izzy - no questioning your answer at all... to me it just seems a blatant security issue, given the data people are storing on these devices.

@Zackary Thanks! "try putting the SD card in a computer": can you explain how to do that with /storage/emulated/0 (the internal card)? :) You might wish to specify you mean the external only. Besides: I always wonder if it really formats /data – wouldn't that mean theinternal SD card to be blanked along? Don't /data (for app data) and the internal SD card share the same partition – and the internal SD is just a "FUSE mount" inside of /data? Quite confusing …


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How to ignore specific ssid from scanning?
I would like to block neighbour wifi named 'akx" from scanning. that means  my cellphone not show this wifi network when finished scanning.


text:
Android Automatically open a Webpage using Chrome on boot
I have an Android TV box plugged on a TV in a waiting room.
I would like to have a web page open on Chrome automatically when I turn it on.
Is it possible to do?
Thanks

Have you tried one of the "Kiosk mode" apps from Google Play Store?

Hello @Robert, I didn't know about these "Kiosk" apps until you told me, I've tried one and it seems to be exactly what I am looking for, thanks a lot!


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How do I keep the Spotify Android app from hogging all free space for its cache?
The Spotify for Android app uses every last byte of space it can find on my device for its cache, and I frequently have to delete /storage/self/primary/Android/data/com.spotify.music/files/spotifycache/Storage to reclaim the space. The last time I did it was about a month ago, and now it's 11GB again (12GB available space in total on that device)
I pay for Spotify and would very much rather not serve as their CDN so they can save a few cents on bandwidth while rendering my device unusable.
How can I prevent Spotify from writing to that directory altogether? I tried changing the permissions to 400 but the app fixes the permission and promptly resumes eating up all free space.


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Error fastboot flash system
Hey i have phone xiaomi mi a2 try install another OS but get this error any ideas? need faster, cuz i can't run phone stuck on android one logo

PS C:\add> fastboot flash system C:\add\pixel.img
  target reported max download size of 536870912 bytes
  sending sparse 'system' (524284 KB)...
  OKAY [ 16.264s]
  writing 'system'...
  OKAY [  0.002s]
  sending sparse 'system' (488200 KB)...
  FAILED (command write failed (Unknown error))

First you need to unlock your bootloader and then you can flash recovery image.
If you have already done that, Check whether you are flashing the proper one.
This is TWRP recovery for MI A2.
After flashing TWRP you can flash the desired rom from it. Do read some threads from XDA, If you are not sure about what you are doing.


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is there a common symlink in android multi-users, access use's `root directory` ？
On test tablet.
There are two users:

/storage/emulated/0/AAA  --onwer
/storage/emulated/10/AAA  --nomal user

My attempt:

adb shell "ls -l /storage/emulated/legacy/AAA" file dot exist.  --failed
adb shell "dumpsys activity | grep -E "mUserLru" | grep -Eo "[0-9]+\]$" | tr -d "]""  find the current user_id     e.g.: 10.
Splice string the path string.Format("/storage/emulated/{0}/AAA","10").  --succeed ,but it's too complicated.

I want to find a simple way.
like a common symlink or adb command,
When different users log in, can use the same method to access different root directory.Thanks.

You have already figured out that the path to user's home directory is /storage/emulated/USER_ID/. In order to find the user id of the the currently running user, follow my answer here. I have updated it along the lines of Android Oreo.

Thanks.  I just read your answer ,then I found the user's link rule. In my opinion, there should be an android API . Different users root directory , the same simple way to access it. Now, it seems that there is no this way.


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How do i get a daily notification?
I'd like my phone to give me a daily notification to remind me to do something. This something isn't time critical, I just need to remember to do it of an evening. Therefore, I don't want to use the alarm function and be interrupted in the middle of doing something else - I just want a notification to appear at a given time.
Ideally any solution should avoid having a constant notification visible, which rules out most of the apps I've tried.
I could just send myself a daily email (as I have a raspberry pi), but I tried that, and the email notification gets lost in with other emails.
I've also tried using notify.run, which only seems to work sporadically.
Any ideas as to how I might achieve this?

Have you tried a repeating calendar event?

Have you tried Google Keep? You can swipe the notification away when you are done with it. I use it for daily reminders.

With a lot more googling, I found this can be achieved with Google reminders. To find them, there's an app called "Google" on the phone. In that app there's a hamburger menu which has reminders under it.


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How to factory reset without having google account verification(FRP) during setup?
I bought Asus Phone last 5 months, and I bought new one today. I'm planning to give the old one into someone but before that, I wanted to factory reset the device to clear all my data but I'm gonna need to sign in my account during the setup after the reset.
how can I reset without needing to sign in my account to verify?
I have full access to device.

How can I reset without needing to sign in my account to verify?

Remove all of your Google accounts from Settings →  Accounts before initiating a reset. That's all you need to do. Alternatively, if your phone offers OEM unlock option unde Developer Settings, you can enable it as well. Both would work. You can disable the latter setting later after completing the setup wizard on the next-cum-first boot post reset.
Tested on Nexus 6 a week ago.
Source: my own answer here.


text:
signing custom OTA update .zip file
We have a kiosk application that needs to be able to periodically do OTA updates using our self-made OTA update .zip files.
Our custom OTA update .zip file have the following files:
/data/misc/adb/
        adb_keys
/system
    /priv-app/
        MyApp.apk
    /vendor/
        build.prop
/META-INF/com/google/android/
        update-binary
        updater-script

We have used many different tablets like Galaxy Tab 3, Galaxy Tab 4 and Yoga 3, the only thing we have had to do is to replace the mount command arguments inside updater-script with the right ones for each tablet.
Of couse, since we do not have the release keys of each of these tablets, we have had to replace every Recovery with its own TWRP Recovery replacement, in order to be able to flash our custom OTA update file. All this worked like a charm every time.
Now we bought new tablets from a chinese manufacturer and when we tried to flash our OTA update package we got the following error:
Verifying update package...
E:footer is wrong
E:signature verification failed
Restarting adbd...
Installation aborted.

From that message is clear that error occurred because the OTA update .zip file was not signed. So, I asked from the manufacturer the release keys and the instructions in order to sign our OTA update .zip file and being able to flash it.
The problem is that the manufacturer's engineers have no clue of how to do this (signing OTA update files so they don't get rejected by their Recovery), which seems like a very common problem because we asked in multiple manufacturers and nobody knows how to do this.
So, I would like to ask for your help since I cannot find the instructions on how to sign it. Anybody knows how to do it?

No... And no one knows how to do this except software engineers, and if they give you the release keys they should be immediately terminated. This would be an extremely security issue, for example, if I had the release keys for any device, you could immediately bypass any and all security mechanisms, root, and access any data with near zero effort. If any company gave you the release keys, they are basically opening the doors and saying "here, take my business from me, you can have keys".

The tablet manufacturers actually build different ROMS for their clients so they generate different release keys for each generated ROM so there is no issue in sharing those keys with the company that is paying for that specific ROM. No "extremely security issue" there since our key will be different to all other keys they have generated in the past.

If you want to provide self-made OTA update you also have to use your own custom ROM. Then you are able to sign OS and OTA update using the same key.

@Storo Then only that manufacturer can give you the keys... Unless you use Robert's suggestion of building your own ROM.

@Robert and acejavelin what I am asking is actually how do I need to sign my OTA update file in order to be able to flash it. It is clear that it needs to be done with the release keys of the manufacturer of the ROM. What I need from you guys is to tell me what do I do with those keys in order to sign the ZIP file.

As acejavelin already told you you will never get those keys from the manufacturer. You have to options: create your own custom ROM with your own signing keys or as the manufacturer how much it would cost to create a "branded ROM" (with a custom signing key) for you (similar as the large mobile network operators have their own branded ROMs for some devices). In the latter case you could the the OTA-updates to the manufacturer and the can sign it with the keys for your branded ROM.


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Termux says file does not exist but it does
A while back I installed nano on Termux and it worked fine, but when I accidentally tried to copy a file into a nonexistant directory at nano's location, nano wouldn't run. I checked and the executable is still there with the object code and all. If I chmod -x nano and run nano, it says nano has wrong permissions but using chmod +x nano and running nano says there is no such file or directory. The same thing happened when I tried installing Haskrll stack. First I tried installing a non-ARM version accidentally, but when I found the correct ARM executable, it had the same issue as nano. I've looked around for solutions and some answers to other questions say the issue could be trying to run from sd card but it used to work so I don't think that's it and don't know of a way to check. Also, all other executables in nano and stack's directory (and all other directories) work just fine.

Seems SELinux issue. Did you try restorecon or setting SELinux permissive? Secondly paths isuus occur when using absolute executable paths while LD_PRELOAD is set.

The thing is, I tried with UserLAnd it doesn't the same issue with stack. Passing binaries in between UserLAnd and Termux doesn't work unless I compile statically. I think the issue is, that as Termux's directories are organized differently, the binaries can't find the .so files. Could SELinux still be an issue? I don't really know what it is. Also, would you know why Termux and UserLAnd say the dynamic binaries don't exists when I try running them?


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"No calendars have been synchronized with this device."
I'm running Android 9 and I'm trying to add an event in Calendar. Upon  clicking the circular button with a plus sign, a message saying No calendars have been synchronized with this device.. I don't want to synchronize the calendar on my phone with anything, be it a Google account, my carrier, or anyone. Is there anyway around this? I never had this problem on my previous Android phone or on my Android tablet.

Which calendar app are you using: Google's, Samsung's, other OEM, other third party? On your prior devices which calendar app where you using?

@MorrisonChang Google's.

@maleb so I have the same issue but I guess the work around is in the app setting or widget hold down the calendar icon and two options appear rather; than new event (give synch loop feedback) click new reminder and you should be able to add your event.


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Make Google Pay require unlocking for NFC payment?
I have installed Google Pay and NFC credit card payment is neat. However, I don't feel safe about it. What if someone snatches my phone, then pays with it before I notice, or after I notice but before I can call my bank to stop the credit card tied to the account?
As things go now, payment up to 30 Euro (I am in Ireland) work without unlocking the phone, just by waking it up with the power button.
Is it possible to set Google Pay to work with NFC only when the phone is unlocked? In this way, if the phone is snatchedm at least it will take the thueves some time to find my pattern...

The only thing I figured out can be done, is to make a job on the phone which would disable NFC whenever the phone is locked and enable it when the phone is unlocked.
I read that it could be done with Tasker but it requires assigning some extra permissions with developer tools (but it doesn't require rooting the phone).

Hi,  I did not go through the process,  but when you install tasker and try to use the NFC toggle it points you to the instruction how to make it work. Then you just create a rule

Automate is another such app people use for this.


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Android 8: enable and disable notification for certain apps during certain hours
I only found answers to this question for older versions of Android and they did not work for me: how do I enable and disable notification of certain apps (Outlook for example) during certain hours automatically WITHOUT using an additional app? The context is that I use my phone for both private and professional emails and I would prefer not to be bothered by work emails outside of my working hours.
On older versions of android I was able to set a schedule (like this: How to disable notifications per app and time frame?), but now I do not find how any more. Am I just being stupid or was the notification subsystem changed?
I have a Samsung Galaxy S7 on Android 8.

Possible duplicate of How to disable notifications per app and time frame?

@Firelord This question is specific to Android 8. The answer in your link does not work any more as stated in my question.

Refer here @njg https://www.androidcentral.com/how-adjust-do-not-disturb-settings-android-o

I have had the same problem for quite some time. I have just developed an app that allows you to cancel notifications from specific applications on the day and time you want. Also, you can set a notification title and/or content, so only notifications of selected app with that title or content will be cancelled.
For example, you could cancel WhatsApp/Telegram notifications from chat group called "Work", between 7pm and 10am during weekdays, and whole weekends.
Here is the app: Disconnect


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When does google backup stop waiting?
I enabled google backup on my galaxy S8 this morning. Photos synced in a few minutes, but all other items ("App data", "Call history", "Contacts" etc) have a message under them reading "Waiting to back up".
Under what conditions does the google backup start for these other items?

The phone is connected to Wi-Fi
The battery full battery
All OS updates are installed (or those that I've been prompted to)
No power-saving features are enabled
Tried attaching to recharger
Tried rebooting
Tried disabling/re-enabling backup

Is there something else I'm missing?  Perhaps there is a setting somewhere to control when backup should be performed?

A common reason for that behavior is if you have activated the power save or data  save mode.

@Robert Power savings are all turned off, but I hadn't thought about  data savings...turns out they are also turned off.  I'm a bit less panicked about this now though since I found that I can transfer data directly from this phone to my new android.  Interestingly the new phone (Pixel) seems to have the same problem.

Confirming that on the OnePlus 7t (Oxygen OS 10.0.14), turning off all lock screen security (nuking fingerprints, etc) enabled Back up now button and backing up to Google Drive procee3ded. What a crappy thing to have to do...

As I just discovered, on a Note 8, screen lock seems to disable backup - including greying out the "backup now" button.  Disable screen locking and everything works.  Re-enable locking, and no backup.  Kind of strange.

Just confirming this works on a Oneplus 5 (Android 9) -- after disabling screen lock, the 'Back up now' button got enabled and it did a backup over Wifi, on battery with 36% left.

Confirming this also worked on a OnePlus 6T (Android 10) -- after disabling screen lock the Back up now... button was enabled and did back up over WiFi while charging.

Thanks for this! I encountered the same issue on my Galaxy S10 and disabling the screen lock seemed to fix it. I was able to successfully complete a backup after disabling the screen lock.

Confirming that it also works on Motorola G(6) Play. Had PIN code lock enabled, and Backup was stuck on "Waiting to back up...". After removing PIN code lock, the Backup now button was blue again.

TL;DR
In general it should be enough to leave your phone on charge, with Wi-Fi available overnight to trigger backup.
Unfortunately, bug reports from users indicate that google have had issues for some time with backups not being scheduled.  We might guess that these issues have either not been prioritised, have been too difficult to fix, have been fixed and reoccured due to poor quality code or whatever.

Google cloud backup has been broken since 2016
My best guess is that my particular problem is a bug from 2016 that is still to be fixed (see this post).  The answer in the linked post from a google employee says,

We have been investigating why some devices are rarely (or never)
  attempt to back up and have identified a bug within the backup
  scheduler. We're working on fix for upcoming Google Play Services
  release. We are not sure yet if this is the only issue, so will
  continue the investigation.

There are no further updates.
Meeting backup criteria (excluding the condition that bugs need to be fixed)
Regarding my question about what conditions will allow backup to continue, the same answer from the google employee provides some useful information:

Meeting backup criteria
Our main backup mechanism (K/V Backup)
  covers call history, device settings and a small subset of apps and
  will upload over any network connection and without requiring the
  phone to be idle and charging. However, our newer mechanism (Auto
  Backup for Apps) covers SMS and apps (~25% covered) is restricted to
  the device being on Wifi, idle and charging. The reason for that was
  that we theoretically can get up to 25MB of data to backup per app and
  that would not have a terribly positive effect on your data usage (for
  those who don't have the luxury of an unlimited data plan). We are
  working resolving this, in all likelihood by:
a) providing an option in settings to be more aggressive to backup,
  e.g. allowing it even when the device is not charging (but on Wifi)
b)
  allowing manual trigger of a backup in settings
c) providing warnings
  when backups haven't happened for a number of days

It seems that neither the bug fixes nor the proposed improvements have materialised, and so we might conclude that google gives cloud backup relatively low priority. Or I guess it could be that the backup code is horrific and takes an inordinate amount of time to modify and debug. Your guess is as good as mine.
On my new phone most items eventually got backed up (after about 24 hours). Now only Contacts are waiting for backup, so obviously something still isn't right, but for best results you could do worse than:

Make sure you're device is on Wi-Fi
Make sure that the charger is connected
Make sure your phone is idle

This last point is a little ambiguous. I imagine it to mean that you shouldn't be actively using your phone for some unspecified amount of time, but it's not clear to me whether stuff running in the background using CPU might affect the "idle" determination.
Without any better information available, you would imagine that leaving your phone on charge, with Wi-Fi available overnight ought to be enough to trigger backup.
Untested workaround
For those who feel sufficiently motivated, a workaround (one that I have not attempted myself) is to use adb to force a backup:
adb shell
bmgr run
bmgr backupnow --all

I hate that Google's corporate ADHD is so believable. Another 4 years on and still entirely untouched.

I have a few suggestions, it can depend on a few different other phone factors but it's worth trying these;
1) turn the "back up to google drive" off, close the settings application and switch the device off then back on and re-enable the sync
2) if you are using a wifi try using a mobile network/phone hotspot as an alternate wifi source
3) i've had it before when the google account needs to be signed out and in again to re-authorise the connection
4) depending on the manufacturer/android version, sometimes each section needs to be turned on to enable sync
5) again depending on the version, some have security features when the time & date has to be updated and location turned on (I haven't come across this one personally)
i hope one of these helps!


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Security related concern for my android phone
i purchased an android  mobile and had my google account set up but the device later went faulty and would not turn on, so now I got the same brand phone exchanged. meanwhile I have also set up my google account to delete itself if at all my faulty phone comes up as the seller took it back. Should I wait before setting up my new phone or will it cause my new phone to not setup properly. How does google's device security detect my account login from a device based on the brand or OS or based on MAC address?.

You can log off you accounts on other devices from your Google account. Then just change your password.


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How to turn off split screen mode in Oreo?
I hate this feature because:

I don't use it
I often turn this on automatically

Any way this can be disabled? I've searched the net but nothing useful came up.
Thanks

Step 1. Enter the Overview Screen. If you see the "Recents" button, tap on that to enter the Overview screen.
Step 2. Enable Split Screen Mode. Tap or long-press the icon near the top of the individual app's card until a submenu appears.
Step 3. Exit Split Screen Mode.
How to end your split-screen mode session?
While split-screen mode can come in handy, it’s definitely not something you want to use all the time. There are a few ways to get out of split-screen mode.
The first, and probably most simple, way to end split-screen mode is by long-tapping the split-screen app switching icon. This method automatically closes the secondary app at the bottom of your display.
Another way to end your split-screen mode session is simply by dragging the divider line all the way to the top or bottom of your display. This method allows you to select which app you prefer to keep open, as opposed to automatically selecting the app at the top of your screen.
Furthermore, there is this thread which can help you too.

The question is about disabling splitscreen mode entirely (as in it can't be accessed anymore), not how to get out of a splitscreen.

I think their is no way to disable it till you don't have root access.


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How to copy the /system/media/audio from phone to PC
The adb pull /system/media/audio command works on one of my phones to copy the folder to my PC, it copies the folder's contents recursively.
However, on my other phone the USB connector is broken, and the phone cannot get a USB data connection. The phone is not rooted and it's impossible to root without losing data. The apps FolderSync, ES File Explorer and ASTRO File Manager can't see the /system folder: they see / as empty.
My plan was (1) to use a file manager to copy the contents of /system/media/audio to /sdcard/audio, and then (2) to use FolderSync to copy /sdcard/audio to Google Drive. Step (1) doesn't work, I haven't found any app so far which is able to see /system. Also running ADB over TCP would require rooting the phone, which is not possible (because I don't want to lose data and settings).
Is there a way to copy /system/media/audio from this phone to my PC?

What about using Termux and copy those files like this?
cp -R /system/media/audio /sdcard/system_audio

and then you can pull system_audio from your storage as usual.
For most ROMs, you'll want to grant storage permission tovTermux first:
termux-setup-storage

and tap "Grant".

I was getting cp: ...: Permission denied until I enabled the Storage permission on the Termux app on Android 9. Then the copy worked. If you update your answer with that, I'll accept it.

Setup an FTP server. I used this app. I set the login to anonymous, HOME directory to root (/) and started the server. I logged in to the server using my PC (used Linux; Windows natively supports FTP access too - try the answer here from Ashok). If you get into issues in using your File explorer to access FTP server, then simply fire up your browser and access the URL directly. It would be like ftp://IP_ADDRESS:PORT. Make sure to remain within the same Wi-Fi.
At first, I logged in successfully (Code 200) but naturally didn't see anything in FTP server (an unprivileged user). But I edited the URL to directly jump into /system/ and it did load successfully, all without root too. My URL was ftp://192.168.0.18:9999/system/.


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How to move apps if the option 'move to sd card' is missing?
My android tablet has 4.4.2 kitkat. The option 'move to sd card' is missing from all apps. The internal memory is 2GB and the sd card is 16GB. Is there any way to move apps to sd card? My tablet is rooted.

Since you're rooted, download Link2sd and it has an solution for you problem.

I tried Link2sd but i get this: "App2SD is not supported by your device. Because your device has a primary external storage which is emulated from internal storage."

Hello Android Enthusiasts!
How to move apps if the option 'move to sd card' is missing?
I seem to be having the same issue with my
Not Rooted: Samsung Galaxy S6 Edge
Device Name/Model number: Samsung-SM-G925A
Android mobile operating system Version: 5.1.1
Linux Kernel version 3.10.61-5927475
I think the 5.1.1 refers to the Android release Lollipop, However the kernel version points toward the KitKat release.
None of my apps seem to have the Move to SD option showing either. I've done some research:
I found this info interesting Android OS allows you to move many apps over to external storage to help free up space on the main device. Be aware of the limitations. Some apps are deemed as too important by their developer, and thus can’t be moved via normal methods. Many apps that ship with the device can’t be moved either. Ultimately, it’s up to the app’s developer to allow or disallow its move permissions. and even with the tweaks mentioned on this page (with the exception of using root), the apps still may not be movable afterwards. Your best bet would be to then email the developer and ask why, or go the way of rooting your device so that you can force it. It shouldn’t be so complicated, but it is.
It needs to be stressed that even if an app (or game) can be moved, there are potential risks for going through with it. Here are some general guidelines of what not to move:
Apps That Shouldn’t Ever Be Moved

List item Widgets: If you want to use a certain widget, don’t move the   app that provides it.
List item System Tools: Important tools might not operate well or at all on external storage.
List item Important Apps: If you can’t afford a certain app becoming unavailable, don’t move it.

Consider that to be your first and final warning!
Things to bear in mind: Some apps may remain unmovable after these tweaks are applied, which is common of apps that come preinstalled on the device.
In this instance, the best fix is to #1. root the phone and either delete the app from the system’s ROM with Titanium Backup, or #2. force the app to be moved with Link2SD. Either one of these options is required for Android 5.0 and later. It’s also important to note that even after certain apps are moved, some data is likely required to remain on the internal storage. Don’t consider these tweaks to be miracle solutions.
Guide Index:
Part 1 – Downloading Android’s ‘ADB’
Part 2 – Setting Up Your Phone Or Tablet
Part 3 – Moving Apps On Android 4 & Earlier
Part 4 – Running The Tweak On The Device Itself
Part 5 – Moving Apps On Android 5 & Beyond

Blockquote

https://techgage.com/article/moving_your_non-movable_android_apps_to_an_sd_card/

Blockquote
                                           ~ Samuel F. Campbell

Say user1800997 I'm new to this sit. I hope this info is helpful, there seems to be a lot of work to be done, I'm also looking into Using terminal to move applications! I just downloaded a Guide "Linux and Android HOWTO by Guido Gonzato, Ph. D. guido.gonzato at gmail.com The HOWTO provides information on how to manage your Android device using a GNU/Linux system. It's aimed at reasonably competent Linux users who want more control over their Android device. He states in the Requirements:

He states in the Requirements:  Root permissions are normally forbidden in Android, unless an enlightened vendor decides otherwise.

To use Link2SD, you must first root your Android device, create an extra partition on your SD card, and download Link2SD from Google Play Store.   https://www.wikihow.tech/Use-Link2SD


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Only image files are showing up in my folder when I view my phone's files on the computer
I need to transfer some sound recordings from my Samsung Android phone to my computer, however when I view the phone's files on my computer, only image files (.jpg, .png, .bmp, etc.) are visible.

No .mp3 files from the /sounds/ folder are appearing.
No .mp3 files from my music albums are appearing (but the album cover photo is appearing!
No .pdf files from my /documents/ folder are appearing.

For all three of the above bullet points, the files are clearly visible (and accessible!) if I look on the phone itself, just not on the computer.
Originally I thought this was something wrong with my Ubuntu 16.04 computer, but then I tried on a different Ubuntu 16.04 computer and still couldn't view the files, and now I've tried on Windows 10 and still can't view the files on my computer!
What can I do to transfer these files from the phone to the computer?
I do not have any memory card inserted into the phone, only internal storage.

Set the USB Connection that pops-up on your status bar to File Transfer instead of Photo Transfer.


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Why does Samsung's Always On Display not work on some not so old Galaxy devices?
Samsung's Always On Display (AOD) has minimum and targeted API 24 i.e. Android Nougat 7.0. It runs on all the latest Galaxy smartphones including, but not limited, to A5 (2017), A7 (2017) and even the much older devices - S6 and S7.
My Galaxy A9 Pro (2016) got updated to Android Oreo 8.0 today with no AOD whatsoever. It had Marshmallow out of the box (S6 had Lollipop). So, I tried sideloading the AOD's untouched APK I obtained from a trusted source. It failed to install, without giving any error message.
Whereas, on the previous Nougat 7.0 OS, I had successfully sideloaded the APK though it never worked. Also apparently there already exists a package with the same name as the APK I try to sideload but maybe it is disabled permanently. So, the quick-install-after-a-reboot trick worked sometimes. It did add the Always on Display option in the Settings app but it always crashed when opened.
What's the reason behind this behaviour? An app which is supposed to run on lower API 24, doesn't work on API 26 even though the manufacturer is same and the hardware isn't much different than the above listed Galaxy smartphones.

Just a guess, but it could be that there's a Samsung-specific API that is not implemented on Galaxy A9 Pro, which makes it crashes when accessed (are you able to get the log using ADB/logcat?). Unfortunately, I don't know much about how Samsung's customization works...


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Unresponsive Samsung Galaxy S6 phone, even to soft reset (volume down + power)
I'm having some trouble with my Samsung Galaxy S6 not responding.
I can't remember which Android version it has; it's whatever it came with in 2015, so it's Marshmallow or earlier. The phone is not rooted, not modified. I think that USB debugging is enabled.
The phone is showing a slowly blinking blue notification light.
It does not respond to pressing any of the keys, does not respond to soft reset (volume down + power), does not respond to hard reset (volume up + power + home).
When plugged into a computer via USB cable the computer does not give the option to connect to the phone.
Running "adb devices" at the (Ubuntu) command line with phone connected returns blank list of devices.
What are my options? Is there some other reset option I haven't yet tried?


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Multiple problems with HTC M8S after rom upgrade
I have an old HTC M8S I'm trying to give a new lease on life by getting off the stock ROM. It's an EE (read Orange UK) branded phone.

romver: 1.11.61.2
CID: ORANG001
ModelID: 0PKV10000
Project: M8_QU_UL_L50_SENSE60

After switching on debug mode and unlocking the boot loader I installed TWRP specific to that model (twrp-recovery-2.8.6.0-m8s-qlul.img) and it worked, recovery worked fine. After that I wiped and attempted to install the Lineage M8S ROM, which did not work.
Now I have a phone that won't boot and can't be accessed on USB, the device shows up in adb as offline. The phone has an SD card, and I've loaded the stock recovery back on, which was successful. I then attempted loading the original ROM onto the SD card as 0PKVIMG.zip, however I got a message about 0PKVDIAG.zip not being present. The device still shows up as
I am not sure how to proceed to get this phone back, several hours of research has been very contradictory. I'd like to get a better rom on than the stock because it was full of trash apps and they stopped making releases for it, but I'm happy to get back to stock and try again if that's what it takes.

Try the ROMs here from XDA Forums, as they can help you to fix your problem.
 You can also try a higher version of TWRP, such as v3.2.1.

Thanks @KirandeepMaan, I've been all over that site for some time without progress, hence the question here.

@GdD try higher twrp version like 3.2.1 or higher may help you if not available try to port yourself.

I followed your suggestion to use a newer version of TWRP and it works now, much appreciated!

Most welcome @GdD


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how to check if i have successfully disabled dm-verity?
my phone has dm verity enabled by default. I read about ways to disable it. After that, is there any way with which can i verify if dm-verity is disabled?

All that dm-verity usually mean is that you have write access to the /system partition. So trying to write to (or place) any file in there should be enough.
Be careful though, modifying /system is always risky.


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Remap headphone buttons
I listen to audible for multiple hours everyday, im wondering if anyone knows of any way/app that will let me remap my earphone buttons to something more useful than play/pause or volume up/down, the amount of times I need to grab my phone out my pocket to click the 30sec rewind is quite inconvenient

I have the same problem, wired headset control worked nice with Podcast Addict (after some minor tweaking in podcast addict settings), but rewind/forward(i.e. prev/next) = double tap/triple tap, on the play button, DID not work with Audible.
A partial solution I have, just tried recently (August 2019):

install "button mapper" app (the app has nasty privileges, a short inconclusive google search suggests those privileges apparently are required to allow the app to do what is intended to do - but please investigate yourself)
in the app, in Headset Button section assign "double tap" to  "rewind" function.

and more or less it works with Audible. The shortcomings:
A) IS NOT WORKING WHEN  SCREEN IS OFF (perhaps is working with screen off on rooted devices).
B) when "double tap" it jump in the Audible the required amount of seconds back but it also pause the playback (so the action is: play-listen, when I want to jump back: double tap, then again a single tap to resume playback)
C) it messed my controls with Podcast Addict, when mapper is enabled, so I have to switch the mapper off to use with podcast, switch on for Audible, (perhaps a further tweak in Podcast addict settings will fix that for me)
For working with screen off, there is a link suggesting some solution, I have not tried this: https://elementalx.org/button-mapper/screenoff-noroot/
Other option perhaps to investigate is a Tasker app.
If any one has an update or know if Tasker can do the job better, please share.


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SyncThing, Lolipop, and "Transport endpoint not connected"
I'm trying to get 2 way sync going with Syncthing on OctOS L (Lolipop, based on Cyanogen) with folders on the SD card.  Backup from Android to other Syncthings works fine.  The Syncthing devs say it's complicated to make things work properly on the SD card because of Google, and someone made a blurb on it.  Not sure why, but the fix doesn't seem to work for me.
I seem to be running into this issue, and the error I'm getting is weird, but more importantly, I'm not sure what Syncthing is doing to my SD Card.
Once Syncthing tries to write to the SD card, it fails, and then the SD card is unavailable to the rest of the system.  For example, Total Commander.  The only way I can get it back is to reboot the phone.  Using the built in Android tools, I cannot mount the SD card.
What does Syncthing do to the SD card when this happens?  Is it messing with the mount point?

Try different Sd card or your sd card might have a low space try Different method like Syncthing to otg or internal storage.

Sorry, but this is more of a comment than a proper answer. Just 18 points more, and you can post comments since then. :-)

No option to add comments without giving answer in Android app stack exchange ohh so i need 18 points thanks for telling.

Actually, when I commented yu had 32 points, now you have 26, but not to worry. The moment you reach 50 points, you would be able to comment on anyone's post. :-) See this to know what privileges you can earn with reputation points.

Ok thank you very much @firelord you comment on all my four answers .

Please keep up the good work of answering. If you need help, visit our [help], [meta] or [chat]. :-)

Thanks @firelord im improving my knowledge and learning lot of stuff from this site and i will answering as much i know again thanking you for helping me.


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samsung j7 clock in unlocked screen
The lock screen has a large clock in the lock screen, which disappears when unlocked and leaves only a tiny display top r/h corner. How do I retain a larger clock in the unlocked screen?


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How long are call logs stored and is this configurable?
As far as I can tell, my OnePlus 3 has complete call logs for the past 6 months (last log 4-19-2018, today is 10-20-2018 which seems too much of a coincidence)
Logs are really useful but some calls I make only once a year so being able to keep (more) complete logs would be really useful.
Is this something that's configurable on Android? And, is there a way to sync this with my Google account so it's backed up even?

There is a limit of 500 entries for calls (incoming, outgoing and missed) in Android. How long will the call log last, go back in time or get filled depends on how often you call or are called.
If your device is rooted, you can install Unlimited CallLog for LP/MM/N, an Xposed module that extends the limit to an unlimited number like its name suggests for Android 5 to 7. For non rooted devices, a search via Google Play Store provides a list of apps that should also extend the limit.
Your device should have the ability to backup the call history; search for Backup in the Settings app. Some of the apps (see previous link) also provides for backup options.
Manage & restore your device backups in Google Drive


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Why my phone is sending some other phone number as my caller ID and for SMS?
I've been using LineageOS 14.1 on ZUK Z1 for quite a while now. One problem I am facing is, sometimes my phone sends text messages from some other number which I don't even know. This also happens to the calls, my phone number is replaced with someone else's number.
Couple of days ago I did a fresh install of LineageOS 15.1 hoping this will fix the issue with my phone, but that had some other problems attached with it. I wasn't able to connect my phone to PC through USB cable, lots of apps were crashing making phone unusable. I had to go back to LineageOS 14.1 but this is not the main question. I wanted to ask what can be the issue which is causing the phone to use someone else's phone number as my phone number while calling or for the SMS purposes?
My friends pointed this thing lots of times and also referred the numbers through which my SMS or call was delivered. After calling those numbers I got to know they are people within my area at the time of my messages being delivered from their numbers. This problem is not on some specific region, I travel a lot and this happens no matter where I am which makes it clear it is not fault in my area's network coverage.
I tried searching for problem like this but I wasn't able to find any single, that's why I am posting this.
There is also another problem which I forgot to mention earlier, my phone restarts on its own sometimes.
Any help would be appreciated!
By the way Lineageos 14.1 is basically Android 7.1 and Lineageos 15.1 is Android 8.1.


text:
When saving a webpage from Chrome on Android, where in the file manager can I locate the stored file?
I need to know where are the saved webpages of Google Chrome stored in Android.  I mean, I can access them from the browser itself but I need to know where its stored in the file manager.

The save folder may vary depending on the firmware of your device, but usually it is mnt / sdcard / download

I checked its not there,could you suggest some other place where it will be

check these paths /data/data/com.android.browser/files/  OR /Download/ OR look for your setings.


text:
Is it safe to enable to allow apps from unknown sources?
I would like to install whatsapp on my Huawei android tablet  but get the message (as others have ) stating ' your device is not compatible'.
Searching the internet it seems that you can bypass things and get it installed. However it seems the only way to do it is to all apps from unknown sources. My problem is I am not happy in what you appear to be doing ie withdrawing security and allowing apps from unknown sources.
Does anyone know if it really is safeand will not allow the tablet to add peculiar and potentially other unwanted app
thanks

As long as you are getting the file/APK from a reputable source, it should be safe.

Installing from unknown sources is by itself not dangerous - it just allows you to do dangerous things. Enabling it will be safe as long as you get the APK from a source you trust.
Just to be sure you can turn the option off after you have installed the custom APK. It doesn't affect things you already have installed, just the installation of and updates of new things.


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How to get device name like "whyred" for Xiaomi Redmi Note 5?
For custom ROMs like LineageOS, the more specific device names are used. So e.g. the Xiaomi Redmi Note 5 is called whyred or Samsung Galaxy S7 Edge goes hero2lte. Having some experience in Android and custom ROMs, I don't know how to find out device names based on the colloquially used device names (Redmi Note 5 -> whyred).
Neither in specs on e.g. shop sites, nor in the device info. Let's look at the device info  of a Xiaomi Redmi Note 5 Pro:

I only see M1803E7SG as the model name here but does not match the device name used for custom ROMs. Especially on Xiaomi, it's a big mess to get rich in different models or editions. Sometimes a single model is not equal across different regions.
For M1803E7SG, I found this article which says:

For reference, our review unit is the M1803E7SG. This is also known a the Redmi Note 5 AI Dual Camera. It is neither the Redmi 5 Plus, which is listed as the Redmi Note 5 on Xiaomi's Mi website, nor is it the Redmi Note 5 Pro either. All three devices are powered by a Qualcomm Snapdragon 636 SoC, but they feature different camera hardware and memory options among other differences.

So, is this a flashable device for TWRP/LineageOS? I'm really confused now and would like to see the device name for this smartphone.

As long as it's on SDM636 you should be fine. The main confusion here is Redmi 5 Plus (vince) which has an SD625 inside, but often confused due to its Indian naming.

For simplicity, you can either find the device codename from the official Xiaomi forum (which I believe is constantly updated). You can also use a third-party tool Device ID to get your device codename:

If you have access to a terminal (either adb or a terminal app) then just run:
getprop ro.product.device

or you can run getprop by itself to get all sorts of good information

Xiaomi specific
Dial *#*#64663#*#* and use 1 Check version info. Near Camera information you can see the codename.
Vendor unspecific
You could use Device ID as xavier_fakerat already suggested. But I also found aida64 which seems more verbose as you can see much more details about the device instead of only seeing the Device ID. But if you're really just want the codename, the Device Id app works well.