问:
Lock-screen passwords sometimes fails
I have recently updated from Android 8.1 to 9.

Since the update, there's a problem that keeps popping up every now and then. no matter how often I type the password, it does not get accepted. And I'm sure the password is right.

The only way out is to re-boot the phone. Then my password will be recognized again, until after a couple of days the problems arises again.

My phone is a Nokia 1, Build number 00WW_2_130_SP01.

Update:

tried changing the password, didn't work.

tried changing PIN for keyboard password input, didn't work

noticed that the previous login before this happens, I input the right password, the device lets me in, but shows the message "Wrong password". And in the next lock, it's for real, it won't recognize the right password.

Title: Lock-screen passwords sometimes fails


问:
Is there an app, or method, to read .desktop file with url links via a file manager
At the moment I can move the .desktop file to the android device and (using FX File Explorer) open as application, choose Firefox, allow Firefox to access files and then it works. But whilst giving a file manager access to my files is a necessity, I don't really want Firefox to have access to my files (which it presumably needs by this method in order to 'read' the .desktop file). I really want the file explorer app to 'read' the .desktop file (as it already has access rights) and then forward the url it found there to my browser.

This is exactly the way both my cloud storage apps (Dropbox and Nextcloud) work when they encounter .desktop files. They just open the url in a browser without needing the browser itself to access the file.

Is there a way to make this happen within a file explorer app?

ContentLicense: CC BY-SA 4.0


问:
How can I block the update on my SM-G930V?
Note that my device is not rooted, and I have not downloaded the recent update yet</p>


问:
'Recycling' off-the-shelf Android devices as server ('Toaster-Net')
Since Android devices tend to be relatively low-power un*x devices, this seems like an obvious usage, I was already able to run the basic setup of what I had in mind, but I think it's a right time for me to consult about this.

I have a few unused Android devices (tablets and phones, some with a broken display), I've seen there are several ways to install various Linux distributions on them, installed some scripting environment (Node.JS or Python) I've successfully ran a few that did not require rooting, and I've ran some server software from them (like Node-Express based REST etc) I'm left with the following open questions, maybe there are much simpler solutions to this scenario.

I'd be happy to hear of such a usage scenario.

All these non-rooted Linux apps I've installed - were running as long as the device did not go to 'sleep', I've tried several 'insomnia' apps, but actually non of them worked correctly, and they were all trying to keep the Display awake. I would actually prefer the Display to be Off, but the device to not sleep, is there a scheme for that, or is that not the general design of a common off-the-shelf Tablet let's say?

The app seemed to randomly go into 'background' even with the display on; Is there a settings to prevent that, so that I would have a reliable HTTP listener?

I understood that Battery life / performance - might be deteriorate severely - by keeping Tablets Changed 24/7, is there a standard solution for that? I've seen some recommendations for rooted apps that prevent charging on and off, but lacking another solution - a timer-AC-mains-Socket can be installed

Generally this seems like an ecological idea for 201x style ARM based Toaster-Nets; I found that I often need some 'cronjobs' to run and serve some not very CPU demanding experiments. It also seems like a good exercise in local net setup;

I can see this setup being used in schools for example to provide students a network they can play with and setup web-apps.

If there's a proper guide for this anywhere, please point, I've seen good guides for how to install Linux / a similar setup - on your phone for example for 'on and off' usage, but nothing that covered the actual aspect of leaving a bunch of these machines as a small server-farm.

Thank you!


问:
What's the easiest way to add files to the Android system partition?
I need to add a root certificate to Android systems. I hope to achieve this by copying the appropriate file the following path: /system/etc/security/cacerts, or using a flashable zip.

Due to the fact that applications from Android version 7 and upwards no longer trust user-added CAs by default, I will need to do this to many tens of devices from multiple vendors.

Possible methods:

Rooting the devices

Via a custom recovery

Drawbacks:

Rooting:

I will need to separately find a method of rooting each device. There
is no generic rooting method that will work for all devices.

Custom recovery:

I will need to obtain multiple customized TWRP (or other) recovery images, one for each device model.

Not all devices have custom recovery images available.

Is there an easier and more generic method to achieve my goal?


问:
2 folders of same name in internal storage of Oneplus3
Currently on my phone, i have 2 folders of the same name. The content of both folder shows 0 bytes. EDIT : They are exactly the same. And the subfolders and files are also same with 0 bytes content. When i deleted the 2 folders with same name, then other new folder was seen with the same name of an existing folder. I know it sounds confusing and impossible. But could this be due to storage problem?

I only want to ask, is this a known problem or has this happened with someone else before ?


问:
Moto G back up without booting
I have a Moto G first generation that is stuck on the M boot screen.  I have tried going to recovery and wiping cache but the cache wipe does not complete even after hours (it stays on wiping/formatting cache).  Is there a way to back up what's on the phone without it booting (so I can then try the factory reset)?  Thanks!</p>

Title: Moto G back up without booting


问:
My GPS location changes when on a call
My GPS location is accurate in Google Maps except when I am on the phone.  It consistently changes my location to another house 5 blocks away. When I end the call it goes back to my real location.
How can I resolve this?
Scott  </p>

Title: My GPS location changes when on a call


问:
Samsung's device care app and running services option in developers settings show two different values for the amount of RAM free on my device
As shown by Samsung:- https://m.imgur.com/gallery/yoiOnlS

As shown by developer options by Android:- https://m.imgur.com/gallery/OzNwRMO

Why is it happening? Why is Samsung lying?


问:
Configure Emergency Alerts on Android Pie
My phone is in either vibrate or DND mode at night. I enabled developer mode in order to be able to allow the emergency alerts to ignore DND, since otherwise they make no sound at night (don't know why this requires developer mode, I would have thought it would be the default setting).

I would like more fine-grained control than just that setting. When I'm sleeping, there's no reason for me to be woken up by one of the frequent Amber alerts, since I'm not going to be much help from my bed. If there's an Incoming Ballistic Missile alert on the other hand, I wouldn't mind be roused for that.

Currently, it seems that I have the following options:

Prevent all alerts from breaking through DND - Makes alerts useless

Allow all alerts to break through DND - Get woken up constantly by
Amber alerts

Turn off Amber alerts and allow other alerts to break
through DND - Prevents me from helping with Amber alerts when I'm out
of the house

Is there a way to configure the alert settings between the various types of emergency alert in Android 9? Maybe an app that give me better control? I'm using an Essential PH-1, if the phone type matters.


问:
How to unlock bootloader on nexus from bootloader/PC command line
I have a nexus 5X phone, which needs a factory reset to fix it's infinite boot loop. The problem is that the bootloader says DEVICE STATE - locked. Is it possible to fix this?


问:
Galaxy Note 4 muffling external mics
I just got a refurbished Samsung Galaxy Note 4 to replace a dead Note II. When compared with the Note II, it is giving me terrible audio quality for voice recordings done with headset mics — there is a severe high-frequency roll‑off that leaves the recording sounding muffled.

I initially discovered this when using the headset that came with the Note II. I have a homemade windscreen rigged up on it, so I wanted to keep using it rather than trying to transfer that to the headset that came with the Note 4.

So, the exact same microphone and windscreen, using the stock Voice Recorder app on both phones, neither rooted, in high quality mode in both cases (recording MPEG-4 audio), and the difference is night and day when listening to existing recordings done on the Note II vs. tests on the Note 4. The recordings from the Note II certainly donʼt sound like a studio condenser mic (like in the appʼs graphic, lol), but theyʼre of reasonable quality, more than adequate for speech. High frequency detail is there; I can hear leaves rustling very crisply, and sibilants in speech are clear and distinct. The recordings from the Note 4, by contrast, sound muffled. Sibilants are muted and somewhat indistinct. It sounds like it was put through a low‑pass filter. Speech is still basically intelligible, but the gap in quality could well make the difference between making out certain words or not under less ideal conditions.

The overall signal level in the Note 4 recordings is also noticeably lower. I have to turn up those recordings more than the Note II recordings to compare them equally. (<s>Iʼm wondering if that and the fidelity problem may be related — the MPEG codec might throw out very quiet high-frequency data by design.</s>) I should note that in the Note 4 the “Recording volume” setting is set to “High” (thereʼs only that and “Low”).

Iʼm listening to both files on a PC with VLC media player, through a home hi‑fi system with proper speakers — not some cheezy self-powered made‑for‑computers garbage.

VLC is showing the recordings from both phones to have a content bitrate around 128kb/s, so I donʼt think itʼs a matter of bandwidth loss from more aggressive data compression.

I figured maybe the electrical parameters of the headset had changed between the two models, and so also did a test with the headset that came with the Note 4. It was maybe very slightly better due to the lack of the windscreen, but basically still horribly muffled — low signal level and significant loss of high frequency response.

I should note that this is not a problem with the Note 4ʼs internal mics. When I unplug the headset and record with the internal mic, the recording is much louder and has decent frequency response.

Possible explanations I can think of:

There has been a significant regression in the quality of the preamp or ADC circuitry for the external mic from the Note II to the Note 4.

My particular Note 4 has a problem in the audio connector that is introducing extra resistance. I have tried cleaning it with a cotton swab and isopropanol, and the issue remained.

My particular Note 4 has a damaged mic preamp or ADC circuit.

There is a system setting buried somewhere that I need to change, other than the obvious settings in Voice Recorder, which are already set to their highest levels.

There is a bug in the Note 4ʼs firmware.

<s>There is a bug in the Note 4ʼs Voice Recorder app, but this seems unlikely, as I expect it just encodes whatever audio the OS gives it.</s>

Any ideas which of these might be happening? If this is a problem in the model itself, surely someone else has encountered this long ago.

The exact model is SM-N910W8 running Android 6.0.1, kernel 3.10.40-8000148.

UPDATE:

I did testing with a 3rd party app that can record raw PCM into a RIFF (WAV) file, and the same muffled sound was there, so itʼs not the fault of the stock recording app or data compression.

Robertʼs suggestion led me to figure out that the ADC for the headset input is in a Qualcomm WCD9330 chip. I also discovered from schematics I was able to dig up that the internal mics are digital mics (the ADC is built into the mic), so the WCD9330ʼs ADCs are not being used for those. I also checked out the engineering specs for a couple similar chips in the same line (Qualcomm doesnʼt seem to have published specs for that exact device), and nothing there suggested that the frequency response should be anywhere near so poor unless the firmware has drastically misconfigured the chip.

I did find a reference, on XDA Developers here, regarding a totally different device, the Samsung Galaxy Tab S2 8.0 LTE, that uses the same chip and has muffled audio input caused by a firmware issue. In that case, a custom ROM was causing the issue, and the stock ROM worked fine. In my case, itʼs using the stock ROM (AFAIK!), but perhaps in this case the stock ROM is at fault.

I did some testing and found, somewhat surprisingly, that the frequency response is actually full hi‑fi with the exception of a two-octave 10dB notch at around 8kHz. This dip at 8kHz is very consistent with what the recordings are doing to speech. Given that the response is consistent with a notch filter, it now looks like the behaviour is probably half‑ways intentional, which was a bit mystifying. I decided to put up this question on the Electrical Engineering SE, to see if there might be a plausible engineering explanation.

The result of that discussion is that it would be normal, due to sampling rates used in telephony, to knock out frequencies above 4kHz in order to avoid transmitting severe aliasing artefacts to the remote party. That filter should get turned off when an app asks for PCM data at a higher sampling rate, but the electronics allows independent control over the filtering, so itʼs quite plausible that the firmware in this particular model, when disabling the filter for audio recording, forgets to disable it on the external mic input.

So far I have not found a confirmation of this as a known issue of this model, but it seems like the most likely explanation.

On a firmware/software level, Android devices are basically a black box to me, so I have no idea where in the software stack this issue would be most likely to be, whether this might be fixed by a custom ROM, or by some utility that runs rooted, or what.

Another dimension to the problem is the very low input volume level. I had originally thought that was related, though it now seems more likely it may be a separate issue. I did find the following suspicious lines in mixer_paths.xml:

```<code><path name="rec-headset-mic">
<path name="ear-mic"/>
<ctl value="14" name="ADC2 Volume"/>
<ctl value="72" name="DEC5 Volume"/>
</path>
</code>```

There are a number of other places there and in mixer_paths_i2s.xml (I2S is Inter‑IC Sound, a hardware bus used by the WCD93xx) that also set a similarly low number for the volume for ADC2.

I say this is suspicious because from what I understand, the integer setting here is in 1dB increments with 84 being 0dB. This would suggest that ADC2 is being set to -70dB — a remarkably low level! However, ADC2 is a hardware port whereas DEC5 is I think some kind of software mixing channel, so without much more intimate knowledge of Androidʼs audio hardware abstraction scheme, I canʼt be sure that the numbers for ADC2 are interpreted in the same way.

To make matters more confusing, there are two identical copies of this file, one in /etc and one in /system/etc. Also, the mixer_paths_wcd9330.xml file, mentioned for the Galaxy Tab S2, does not occur in either of these locations. And there doesnʼt even seem to be a /system/vendor/etc directory on this phone.

I canʼt edit this file to play around with it without rooting the phone, but Iʼm a little reluctant to do that, partly from having zero experience rooting phones, and also because if I do discover a hardware issue, I donʼt want the store to be able to blame it on that. So Iʼd need to first be confident itʼs going to fix the problem.

Title: Galaxy Note 4 muffling external mics


问:
How can I install ROM on SD-card?
I'm searching the Internet and xda-developers, but they all have tutorials to flash ROM on the device itself; I'm afraid that would brick my device, especially that it would destroy the original ROM.

Is there a way to flash the ROM on an SD-card?

My deivce is Samsung Galaxy Note 2, and I'm looking for Cyanogenmod (maybe CyanogenMod 14.1 ROM, as in here)

Title: How can I install ROM on SD-card?


问:
Cron job over adb possible?
I'm trying to use my phone less. I've managed successfully to remove apps via adb. My question is if it's possible to have apps disable/remove via their package names over adb, and then reinstated on the device at certain times of the day.

So for say the hours 9am to 5pm Chrome app would be completely removed and not on the device, then after 5 it's there again.

I'm not wanting app timers or the app being disabled but app icon still visible. I'm after the full removal followed later in the day by it's full revival. Thanks :)

Title: Cron job over adb possible?


问:
Can I decrease the audio latency of Android (for a Midi keyboard)?
I've connected a MIDI keyboard to my Moto E4 and I'd like to decrease the audio latency.  I've searched online and found that Android OS doesn't do a great job processing audio signals quickly.  Is there something I can do about this?  This is a phone I don't use, so I'm open to anything - I've looked at options involving another OS (haven't found any), or rooting the OS and maybe something then.  I'd like to prioritize the audio signal as much as possible, I need to run one app and then output from the phone.  Thanks for your help!</p>


问:
Backup app data from Android 4.1.1
I need to backup app data (some games) from Android 4.1.1 (Xiaomi Mi2S) and than restore them on Android 9 (Xiaomi Mi9T). I have tried using adb backup, but current version is not compatible with Android 4.1.1 (creates 41 bytes file). When I tried using older ADB (as suggested here: link), I couldn't get adb devices to recognize my device.

Is there any way to backup app data without using adb backup? I have access to root on Android 4.1.1 but not on the new Android 9.0

Title: Backup app data from Android 4.1.1


问:
How do I switch from swipe-up to tap in order to answer a call?
I have a UMX phone running Android 8.1 Oreo. For some reason, I can't always answer an incoming call by swiping up. I do it several times, and the little green circle moves up with my finger, but then back down again and the phone keeps ringing, and I miss the call. Then sometimes, it does work, and I swipe up once and I answer the call.

I can't figure out what is the problem if I'm doing something wrong sometimes, or if it is a glitch in the software or a screen sensitivity issue, I don't know.

Could it make a difference if my finger is cold or dry? Sometimes my hands are cold, sometimes dry, sometimes sweaty. Does it matter how much pressure I apply to the phone when I swipe up?

Is there a way to switch from swipe-up to tap in order to answer a call? I could not find anything in settings that had to do with answering a call.


问:
no more space on device while writing to exFAT folder on MicroSD card
```<code>    JasonR:/ $ su
JasonR:/ # cd /stor*/emu*/0/WhatsApp
JasonR:/storage/emulated/0/WhatsApp # cd Media
JasonR:/storage/emulated/0/WhatsApp/Media # ls -al *.jpg
-rwxrwx--x 1 root everybody 506827 2019-02-22 11:42 DSC_20190102_130645.jpg
</code>```

## I cant' move a regular file in whatsapp Images folder

```<code>cp DSC*.jpg  "WhatsApp Images"
cp: cannot create regular file 'WhatsApp Images/DSC_20190102_130645.jpg': No space left on device
</code>```

## Neither can I create a 0 byte file.

```<code>JasonR:/storage/emulated/0/WhatsApp/Media # touch 1.jpeg
JasonR:/storage/emulated/0/WhatsApp/Media # cp 1.jpeg "WhatsApp Images"
cp: cannot create regular file 'WhatsApp Images/1.jpeg': No space left on device
</code>```

## du command o/p

```<code>du -sch "WhatsApp Images"
2.0G    WhatsApp Images
2.0G    total
</code>```

## Df command o/p. The BindFs between internal storage and SD Card can be seen.More details in Mount o/p below

```<code>JasonR:/storage/emulated/0/WhatsApp/Media # df -h "WhatsApp Images"
Filesystem                       Size  Used Avail Use% Mounted on
/mnt/media_rw/76B2-B58E/WhatsApp 109G   65G   45G  60%
</code>```

## I m listing top 5 elements in that directory

```<code>JasonR:/storage/emulated/0/WhatsApp/Media # cd "WhatsApp Images"
ls -al | head -5

   <
total 3962688
drwxrwx--x  5 root everybody  2097152 2019-07-29 14:32 .
drwxrwx--x 13 root everybody    32768 2019-07-29 14:44 ..
-rwxrwx--x  1 root everybody    95402 2019-01-13 01:50 IMG-20150526-WA0005.jpg
-rwxrwx--x  1 root everybody   161097 2019-01-13 01:55 IMG-20150711-WA0000.jpg
</code>```

## I can move up and restore a file within the WhatsApp Images folder.

```<code>/storage/emulated/0/WhatsApp/Media/WhatsApp Images # mv IMG-20150526-WA0005.jpg IMG-20150526-WA0005.jpg.old
/storage/emulated/0/WhatsApp/Media/WhatsApp Images # mv IMG-20150526-WA0005.jpg.old IMG-20150526-WA0005.jpg
/storage/emulated/0/WhatsApp/Media/WhatsApp Images # mv IMG-20150711-WA0000.jpg ../
/storage/emulated/0/WhatsApp/Media/WhatsApp Images # mv ../IMG-20150711-WA0000.jpg .
</code>```

## Just <16.5K files totally. ExFat Limit is 2,796,202 per dir

```<code>/storage/emulated/0/WhatsApp/Media/WhatsApp Images # ls -alh | wc -l
16387
JasonR:/storage/emulated/0/WhatsApp/Media/WhatsApp Images #
</code>```

## MOUNT command output

```<code>mount | grep -i "Whatsapp"                                                     <
/mnt/media_rw/76B2-B58E/WhatsApp on /mnt/runtime/default/emulated/0/WhatsApp type sdcardfs (rw,nosuid,nodev,noexec,noatime,low_uid=1023,low_gid=1023,gid=9997,mask=0006)
/mnt/media_rw/76B2-B58E/WhatsApp on /storage/emulated/0/WhatsApp type sdcardfs (rw,nosuid,nodev,noexec,noatime,low_uid=1023,low_gid=1023,gid=9997,mask=0006)
/mnt/media_rw/76B2-B58E/WhatsApp on /mnt/runtime/read/emulated/0/WhatsApp type sdcardfs (rw,nosuid,nodev,noexec,noatime,low_uid=1023,low_gid=1023,gid=9997,mask=0027)
/mnt/media_rw/76B2-B58E/WhatsApp on /mnt/runtime/write/emulated/0/WhatsApp type sdcardfs

    (rw,nosuid,nodev,noexec,noatime,low_uid=1023,low_gid=1023,gid=9997,mask=0007)
    JasonR:/storage/emulated/0/WhatsApp/Media/WhatsApp Images #

    .
</code>```

## Going into Images directory directly without a bindFs link  & creating a 0 byte file Fails

```<code>JasonR:/mnt/media_rw/76B2-B58E/WhatsApp/Media # cd "WhatsApp Images"
    touch 1.jpg
    touch: '1.jpg': No space left on device

    JasonR:/mnt/media_rw/76B2-B58E/WhatsApp/Media/WhatsApp Images #
</code>```

## Now I 'll list some jpg's

```<code>    JasonR:/mnt/media_rw/76B2-B58E/WhatsApp/Media/WhatsApp Images #
    ls -al *.jpg | head -5
    -rwxrwx--- 1 media_rw media_rw    95402 2019-01-13 01:50 IMG-20150526-WA0005.jpg
    -rwxrwx--- 1 media_rw media_rw   161097 2019-01-13 01:55 IMG-20150711-WA0000.jpg
    -rwxrwx--- 1 media_rw media_rw   183103 2019-01-13 01:53 IMG-20150711-WA0002.jpg
    -rwxrwx--- 1 media_rw media_rw   170516 2019-01-13 01:55 IMG-20150711-WA0003.jpg
    -rwxrwx--- 1 media_rw media_rw   190117 2019-01-13 01:55 IMG-20150711-WA0004.jpg
</code>```

## I can move a file inside that folder 1 level up && after moving it , it WILL let me create an additional file

```<code>    mv IMG-20150526-WA0005.jpg ../
    touch 1.jpg
</code>```

## Now with that additional file created I will move back the original file  It will REFUSE this unless I delete the additional file I just created

```<code>                                                                       <
    mv ../IMG-20150526-WA0005.jpg .                                                <
    mv: cannot move '../IMG-20150526-WA0005.jpg' to './IMG-20150526-WA0005.jpg': No space left on device
    JasonR:/mnt/media_rw/76B2-B58E/WhatsApp/Media/WhatsApp Images #

    JasonR:/mnt/media_rw/76B2-B58E/WhatsApp/Media/WhatsApp Images #
    rm 1.jpg
    mv ../IMG-20150526-WA0005.jpg .
</code>```

##sounds like it cares about the #files . Issue is not space related

exFAT
file  system is supposed to allow more than 2 million files per folder.

so just to give you an idea of my situation.

as is well known WhatsApp will not let you specify where to store its huge volume of media and database files i.e.
WhatsApp  folder in  user internal storage. so I have to use a bind approach to link to a folder on my exFAT MicroSD card with the same name.

all was well for almost 2 years and all of a sudden out of Nowhere I had the situation where  WhatsApp images
i.e. the "WhatsApp Images" folder ( WhatsApp/Media/"WhatsApp Images")
will simply refuse to accept any more jpg from WhatsApp
if I un-bind this relationship and have everything downloaded on my internal memory the jpg's & other media are downloaded just fine.  but internal storage is crammed - I don't have space.

binding does not cause this to happen to other media i.e. video documents etc.  this only happens to images folder and presumably that is related to large number of image files already in that folder.
exFAT does not have such a low ceiling for number of files you can put in a folder.
 also just to complete the picture, I can write to any other folder on that micro SD card through binding on internal storage

what I did

renamed this folder ( folder.old )and created a new folder and moved  all files into that new folder also called 'WhatsApp images' and after about a week the same issue crept up on this new folder

since most of the space is hogged by videos , I created a bind only for video folder ( WhatsApp videos) everything else could go to internal memory.

 the result was videos could not be downloaded. so I could bind only the parent  WhatsApp  folder lock stock subfolder approach fails

so my questions are:

exFAT  does not have restrictions for such a small number of files in a folder what is causing this issue.
on command line it shows up as no more space available

I have attached screenshots of my terminal emulator

why does in subfolder approach not work. I'd assume that has to do with temp files created elsewhere while you download the video and then they have to be joined some place on the same partition and so the binding does not work  . if at all this is in fact true then where does WhatsApp store temporary files before it joins them so this temp folder can also be linked through a bind relationship


问:
Having trouble powering up my phone with another power source
I am having a bit of trouble powering my phone I got a Lenovo A7000 plus which is the same as K3 Note version and this phone uses BL243 battery

Here is some information about the battery

Typical Capacity: 3000mAh/11.40Wh

Nominal Voltage: 3.8V

Limited Charge Voltage: 4.35V

and also I have a USB charger 5.0V 1.5A, I used the charger with another K3 Note phone I had, and I used it to power it up (using wires in place of the battery) it looked like it was all fine even after that when I connected the device to my pc it detected the device just fine also the k3 note's screen is damaged soo it won't show anything on it just boots up

so I wanna know is it possible to power my working A7000 plus with that charger using wires instead of the battery without destroying it


问:
Connecting Micro USB keyboard to a Type C device
I've recently purchased a micro USB smartphone keyboard (image below).
The problem is, I'm using OnePlus 5T which has a type C USB port. I've already tried micro to type C adapters, but those didn't work.
Is there any way to make this keyboard work with a type C device?

OwnerDisplayName: Asaf


问:
In Google Chrome for Android, how to remove permanently all the visited pages icons - or restore all the removed ones
I want to have a clear new tab page in Chrome so that I don't get suggestions on what to browse. For that reason I pressed each of the icons on it and remove them. However new ones keep appearing all the time.

I looked everywhere in Google and played with the chrome://flags but they keep appearing all the time.

For that reason I would like one of the following options:

make sure I have a clean new tab page with no icons of websites at all. Or in case this is not possible

to revert all the removals so that at least I see the pages I like the most but where removed (I didn't clear my browsing history because I have kept it for years and I'd like to keep it)

Also I've uninstalled the Chrome app but didn't help.

OwnerDisplayName: Michel


问:
WiFi and Bluetooth not working on android-x86_64-8.1-r1
I have install Android (android-x86_64-8.1-r1) on my HP Pavilion G4 Notebook PC. For few months, it worked very well (except Bluetooth). But now it can't see Wi-Fis around me and the Bluetooth didn't worked from the installation. I have tried a previous version (android-x86_64-7.1-r1) and PhoenixOS (based on Android-x86) but the same problem. Is there any solutions?


问:
Htc one A9 firmware flashing problem
Htc one a9 (model: 2PQ9100) see the error below i'm facing please help me i am very upset

C:\adb>fastboot oem rebootRUU
...
OKAY [ 0.047s]
finished. total time: 0.048s

C:\adb>fastboot flash zip firmware.zip
target reported max download size of 1166400000 bytes
Invalid sparse file format at header magi
error: write_sparse_skip_chunk: don't care size 617001178 is not a multiple of the block size 4096
sending sparse 'zip' (1139061 KB)...
error: write_sparse_skip_chunk: don't care size 617001178 is not a multiple of the block size 4096
error: write_sparse_skip_chunk: don't care size 617001178 is not a multiple of the block size 4096
OKAY [ 53.554s]
writing 'zip'...
(bootloader) HOSD CL#853511
(bootloader) ERR lzipv2_init : Cannot open file /dev/fastboot_download_z
(bootloader) EOonp
(bootloader) ERR [SD_UPDATE_ERR] update_fb_ZIP_buf: can not find ZIP hea
(bootloader) der
(bootloader) ERR [SD_UPDATE_ERR] sddownload failed: 22
(bootloader) ERR Update zip file failed.
(bootloader) ERR ZIP ERROR, exit read zip loop
(bootloader) ERR ZIP signature checking failed...
(bootloader) Update zip file OK
(bootloader) ERR ZIP ERROR CODE, 22
(bootloader) end@Done
FAILED (remote: 22 RU_HEADER_ERROR )
finished. total time: 91.572s

Title: Htc one A9 firmware flashing problem


问:
Clock resetting when battery is removed
Every time I turn off my phone and remove the battery the clock on it gets reset and it causes problem for some apps I was wondering if there is some other way to sort out the problem

like is it possible somehow with a script to rewrite the default time/date
or like to set the time/date before any app loads up

Title: Clock resetting when battery is removed


问:
Connect Android to OTG cable and PC
TLDR: I'm wondering if it's possible to connect a android device to a device(lets say usb flash drive) while staying connected to the computer.

I'm developing a app that requires a ftdi chip to be connected to my device via USB. I connected a OTG cable and everything works just fine. The problem is that I want to do some debugging(i use android studio) and i need the PC connected to the tablet at the same time.

I tried multiple ways to connect to a adapter using a otg cable and normal cable

At this point i'm wondering if it's even possible to do that.

Title: Connect Android to OTG cable and PC


问:
How do you enable MTP on Android 8.0.0?
Developer options on. Select USB Configuration is MTP (Media Transfer Protocol). When I plug the USB into my Windows 10 computer it does nothing.</p>

Title: How do you enable MTP on Android 8.0.0?


问:
Yet another play store df-dferh-01 issue, Pixel 3a
Pixel 3a here.

After a fresh install of the latest factory image, I was unable to download apps from play store.

Searching or browsing apps in the store are without any problem, but once I tapped Install button it shows  Error retrieving information from server [DF-DFERH-01] like other people.

I've tried to clean the cache/storage, uninstall update, re-login Google account, countless reboot between the methods above, but none worked.

One thing I've noticed is that those apps have been installed before, are able to be installed again, and those dont are not.

So I suspect it's a problem related to my account, or their server, any clue helps, thanks.


问:
How to get rid of "Device is not Certified"?
I wanted to ask that is there any solution for getting rid of this "Device is not Certified" without/with root? I have flashed Phusson's GSI and then GApps Micro but the first error j get is that on Setup screen, it sticks on Checking for Update no matter how much time I give it to check(Problem 1). The second problem is that I have sent the Android device ID (or whatever) used to certify the device but if no avail. It's still saying not Certified. I can spoof it by Magisk, that it is Certified by a module ummm... I forgot it's name(but it's not PlayStore Visa for sure) but still I can't use Google Play services in my device. Whenever I use an app that requires so, it gives an error that "Google Play Services is having trouble .....". What can I do to resolve this issue and use Google Play Services? (I have Redmi S2 but the issue seems to be on all devices)</p>


问:
How to run a mouse on android 7.1 (TV Box)?
I got gifted a nice wireless mouse this morning.
I've seen android work with a mouse before so I figured it can handle it as a plug an play, given that this one doesn't have fancy buttons that can be configured - hence needing special software.

Well that wasn't the case, and the manufacturer of the mouse doesn't have android drivers.

Is there such a thing as a general mouse driver I could find. If windows while offline can give basic functions to a new mouse, can we give a helping hand to android to jump the gap?

Normally I'd just go to the store and swap it for a Bluetooth mouse but its a friendly gift and I don't want to do that unless i have to.

The tech is "96 pro plus" tv box (has two usb ports) runs a cable mouse with no problem.

(Just returned it and got a bluetooth replacement in the end)


问:
How to install TWRP?
I'm a very beginner and I read some info about ADB tool and other articles about flashing ROM, rooting and things like that. I would like to install TWRP recovery on my phone using ADB tool.

I did the steps in this web page. It showed on the mobile screen that some data or files are successfully transferred (As far as I remember).

Now, when I enter the recovery mood, it's the same screen (same software) that appears before installing TWRP.

Why doesn't the  TWRP interface open? The link said "Done!!! Now you should have TWRP on your device" but I don't know how to open it on my phone.

Phone type: Techno W4

Title: How to install TWRP?


问:
Is there anything like live CD for android phones?
We can go into recovery mode in android phones, which is usually home+volume up+power for samsung phones

This answer says that the recovery mode is like a simple OS that the device boots into. This OS then is not restricted by protections and folder permissions implemented by android, so it can see root folders and write to it if needed. I have also once seen (not sure of all the steps I did but I remember doing it) that a zip file in the sdcard root can be used to temporarily change this recovery screen software to something else (I think it was CWM recovery zip file, but it was the type where once you restarted the phone and went to recovery mode again, you would have to run the zip file again to get back to CWN recovery screen. There was a way to permanently replace the recovery screen with a CWM recovery but I didn't try it)

If that is the case, is there anything like a live CD for android? preferably also with a touch screen gui, and able to install and run apps from the phone's internal memory or sdcard? Has this been done or is it technically unfeasible? Would it have to be separately made for different phones?


问:
In Android 8, during video recording, how the data is saved to disk?
In Android 8, during long video recording,
1) how often does the recorded video data is written to internal storage?
2) What is the size of each piece of data written?
3) Is the data stored contiguously in the internal storage or each piece of data is stored independent of each other?</p>


问:
Why isn't the OnePlus 7 Pro compatible with Google Daydream?
Is there any shortcoming in the hardware offering of the One Plus 7 Pro that makes it ineligible to run Daydream? I can't see anything that specifies what exactly makes a Daydream phone special.

I see the YouTube VR page in the Play Store says that my hardware isn't compatible. But it doesn't tell me why it isn't compatible,


问:
Background usage even if the app put to sleep
I have put the WhatsApp to sleep (App Usage --> Put app to sleep ( ON ) ) but when I checked on the battery usage, it shows 1 h 6 min.

I'm using Android Pie on Samsung Galaxy Note 8.

How I can ensure that the app will not use battery in background. I guess one way to use the 'Force stop' in app manager.


问:
Android 8.0 | How to show the day of the week on my widget (HTC CLOCK) or Notifications area at the top
so I have this problem of not knowing the day of the week (Monday, Tuesday,...) and having it on my HTC 10's home screen or the notifications pane would help a lot. I remember that one of the above-mentioned items showed the day of the week along with the date, but I don't know why it is gone. Any help will be much appreciated.

P. S. Priority is to avoid installing third-party apps for this simple thing.


问:
SSL certificates not updated on old Android
I have an old Android smartphones. More and more websites stop working because my chrome browser doesn't trust the root CA (Outdated or missing CA certificates). Obviously the root CA list is only updated via an android os update.

Any ideas how I can migate the problem? (Beside adding them manually / buying a new phone) Lineageos isn't supported as well.

OwnerDisplayName: firendlyQuestion


问:
What .apk is missing for my htc wilfire s to be able to boot?

Possible Duplicate:

  Can't boot my Htc Wildfire S after deleting Sense

I have deleted some pre installed apps on my Htc Wildfire S.
Now I am not able to start it, does anyone know which .apk could be missing and is causing it to not boot?

ContentLicense: CC BY-SA 3.0


问:
Repairing a suddenly dead Samsung Galaxy Note Pro 12.2
Samsung Galaxy Note Pro 12.2
(1,
2)
bought used for diversity of Android tests during app development. Died suddenly a year later.

Would still like to keep it running. It now has no sign of life when plugged in, but
because the battery was still holding a 3-hour charge when last used, I suspect that the sudden death is
not caused by the battery. The battery would have dwindled more slowly.

Net chatter suggests that the USB connector is prone to breaking. Have you been there? Is this repairable?

I am content to use it with the power cord attached. Yet replacement battery sellers suggest that presence of a working battery is necessary. Have you been there? Can you confirm one way or the other?

I used the 10.1 tag because the 12.2 is identical in build quality (or lack thereof) to the 10.1. Your experience with the Samsung Galaxy Note pro 10.1 is likely very relevant.


问:
how to always ask password in k-9 email app android
I have installed K9-mail in my android phone and mapped my 2 email accounts. When I open the K9-mail app, it opens without asking the email account password.

But I want to make the settings to always ask for the password before it opens an email account in that app and before its sync with the respective servers.

I have Thunderbird on my desktop and have this setting, which always prompts me for a password for the respective email accounts before it syncs (connect to email server). Could anyone help with this, please?


问:
Why do some apps still get push notifications when there's no data?
I have both Facebook and Instagram blocked from using data on my phone (only WiFi), but I still get push notifications from them when not on WiFi. How and why is this happening, and how do I stop it? </p>


问:
Restore folder of icons to home screen
My one year old was playing Balloon Pop on my Pixel 2 and accidentally removed a folder of icons from my Home screen. There happened to be 11 icons in that folder and I'm hoping I can easily get it back without rebuilding it manually? (Some sort of undo function or "trash" area?)

As a side note, any recommendations on how to lock the home screen icons? The icons tend to get accidentally moved a lot, though this is the first time they got completely removed.

Title: Restore folder of icons to home screen


问:
How to stop Do Not Disturb turning on every day at midnight?
Every day at 00:00 my phone goes into Do Not Disturb mode. I have turned off Do Not Disturb in all settings. I have tried with scheduled Do Not Disturb and with the schedule turned off.

No matter what, it turns on every day at 00:00 without my permission.

How do I stop this?


问:
How to dismiss non-removable notifications?
So I've got a new Android phone like a week ago. But still couldn't get used to it. Still, couldn't figure out some part that how is it workes. Now, this is about notifications I get by installed apps. On the drop-down menu, I get it usually but some of these notifications are not removing even if I try to remove it. Most of them are saying that some kind of app running. And it won't dismissive.

Does anyone have any idea how to remove these non-removable notifications?


问:
If Bluetooth Then Hotspot
I have a Pixel 2 and I just installed a Android head unit in my car. I am looking for an app or script that when I get into my car and my Pixel connects by bluetooth to my head unit it turns my Hotspot on so my head unit can get internet connection. I tried IFTTT but that doesn't have an option for it. I am new to Android a bit but pretty computer savvy. Has anyone seen an IFTTT like this or know of how this can be done?</p>

Title: If Bluetooth Then Hotspot


问:
Facebook app appears twice in "Open With"
I was trying to open a link to a Facebook post sent in Facebook Messenger recently, and I got an unexpected "Open With" dialog, asking whether I wanted to open it with...

Facebook

com.facebook.katana

Facebook

com.facebook.katana

The exact same app entry repeated two times, like so:

This looked suspicious to me. Is this possibly a sign of some malware that's masquerading as Facebook on my phone? Or is it just an innocent bug/confusion within the Facebook app or Android system?

Are there particular steps I should take to fix it?

Facebook appears only once in my "App info -> All apps" list.

I'm running Android version 9 on a Google Pixel 2. My Facebook app is version 232.0.0.35.115 - I'm happy to dig up any other diagnostic information that might be useful, just please let me know in a comment what needs to be added/clarified.


问:
Sharing gmail can 'potentially' erase my device
Me and my friend use shared email (about 15 people), then i realized from that gmail account i can see the connected phone (specially android), and i can play around with that (lock phone, ring) and wipe out the device / factory reset, and i thought this is so ridiculous, who would have thought sharing email account can do that much harm, to my question :

Can i select which gmail account (strictly personal account) have access to wipe my device and which not?

edit: currently i had find my device setting disabled


问:
inject recorded audio in an in-going call
I need to inject a recorded voice during a live call to test the network, how can I do that?
I got a rooted device working on Qualcomm  MSM9889 soc.</p>


问:
Which Android system file(s) should I change to connect only to specific Wi-Fi hotspots
I would like to make change in some file under the root so that Android on my device be able to connect only to specific Wi-Fi hotspots by their names and be disable to connect to all others hotspots. I mean to specify a list of the allowed hotspots in a file. I'm interested only in changing a file or files under the root and not in a program/app or changing of settings.

Which file should I change and how to?

If I make my device rooted, then add specific networks in data/misc/wifi/wpa_supplicant.conf and then switch update_config to 0, new networks are not added to the file, OK. But I still can connect to any network by typing its password manually. So how to disable this? Or how to change graphic interface to be disable to type the password manually?

ps. It's not a duplicate of Only connect to certain Wi-Fi networks


问:
Turn off the prompt asking "You usually dismiss these notifications. Keep showing them?"
I often dismiss notifications from my home screen by swiping them. For example, I collaborate through google docs a lot, and get updates on when a document has changed. I like knowing when this happens, but often don't need to see the change itself so I just dismiss the notification by swiping. However, almost every batch of notifications I do this with, I get prompted with:

"You usually dismiss these notifications. Keep showing them?"

It interrupts me being able to dismiss notifications. And I get asked this constantly even after selecting "Keep showing".

How can I prevent these "You usually dismiss these notifications. Keep showing them?" notifications from appearing?


问:
Can I flash update.zip of titanium backup to non-rooted device
I was searching for an answer but I couldn't find any explanation if I'm able to flash update.zip of Titanium backup to non-rooted device.</p>


问:
Play a video on a TV over HDMI without DEX experience
I see there are two options on how to connect my S9 to a TV over HDMI: dex and screen mirroring. Neither of them quite fits what I want to do.
I'm coming from the iPhone and I want to do the same as there - use a tv only when a video is playing. E.g. I'm browsing web on my phone as usual but once I start a video I have a choice where to run it on the local phone screen or on the connected screen.

Full dex experience is just too much hassle and looks like overkill for this, not all the apps support it and sometimes there are minor issues with fullscreen players. While screen mirroring is even worse, works only with phone display on and adds black bars twice horizontally and vertically, I believe it's because screen ratio of S9 does not match my TV screen ratio 16:9


问:
Missing recovery mode on Android?
I can't hard reset my Android phone it seems like my recovery mode is missing what should I do to make it back to normal or default? I already tried to perform hard reset but it only reboot to menu.
My phone is O+ 8.38z
Android version 5.0
It is still working
But i can't access fastboot and recovery mode</p>

Title: Missing recovery mode on Android?


问:
Vysor app isn't working for chrome on windows 7
I referred this site to install and run vysor app but it turns out that it needed a graphic card instead of using integrated graphic cards on my windows 7

there was solution on how come over this error

but that solution was only for the windows 10 users to turn on multiple displays and that option isn't available in windows 7
help me please


问:
Android "Nearby" ( set up nearby device ) - "No devices Found"
trying to migrate over from  1 mobile to other . Older is on 7.0 and newer is 9.x aka Pie.

Both devices have bluetooth and wi-fi turned on. In fact one sees the other on a bluetooth scan and they are paired.

Its just that the nearby service (?) of whatever its called that is used  for setting up a new device just doesn't do its job.
I initiated  simultaneously from both phone - the "find nearby devices" beacon...none of the phones "found " each other . I repeated the same separately- No avail.

Why is this happening and what does it take for this stuff to run correctly ?


问:
fastboot doesn´t see device but device manager & windows does
I am trying to unlock the bootloader of my Umidigi F1.

ADB works, recognizes my phone but once I get into fastboot mode, fastboot devices does not display and devices.

I did install all the drivers and Windows itself does see an Android device,
and device manager does not show any unknown devices.

I have attached images of the devices Windows and the Device Manager find once I connect my phone in fastboot mode.


问:
where can i get app back that opens a tab for all my apps?
My smartphone was open in my pocket and the application that opens the tab for my all apps disappeared. Now i can open apps that are not on the home screen just through the play store.

phone sony xperia xz2 compact, android pie 9


问:
Camera folder displayed as empty, but contains 20GB data
My Lenovo Moto G5 Plus' internal storage ran full, and now there appears to be a problem with the photos that are saved on its internal storage. The internal DCIM/Camera folder is displayed as empty when I

open the gallery app

open the folder with the Solid Explorer app

open the folder on my PC (file transfer mode as well as PTP mode).

BUT the app "DiskUsage" says that the folder has got a size of 20GB, and luckily I was able to do a backup of its contents using adb pull.

What can I do to make the content visible for the phone again? Using a scanning app like "SD Card scanner" did not help.


问:
Read adopted and encrypted SD card with external SD reader?
My Moto G5 sd reader doe not work anymore, and does not read the SD card that was adopted and encrypted. I want to access the sd card to save the data/pics etc.

I thought that I could use an external SD reader, and that the phone would recognize that this is the "internal" card, and hence give access to the data. It does not seem to work: using a file reader like amaze, I see the OTG option, but nothing happens? Which steps could I do? Note my phone is not rooted.

Thanks!

PS: an alternative would be to read the SD card in my Linux machine, and follow the instructions from this page, this one or this guide. My understanding is that I would need to root my phone, and hence potentially loose all data anyway.


问:
Can I use my spare android phone as a Bluetooth speaker?
Actually, I have a spare android phone which is connected to my old speaker system. I wanted to connect to that phone via Bluetooth as if I'm connected to a Bluetooth speaker.
So that, I can route audio to the speakers using any device connected to that spare phone (Indirectly giving the Bluetooth functionality to the old speaker system)

Edit: I saw the related questions, those questions needed any working method that solves it. I don't want to use any third-party app like a music player or anything. I just want the spare android phone to be connected as an audio source to my phone.

The first image is the screenshot of a Bluetooth headphone connected to my phone. I want the same settings as "Media Audio" when I'm connected to spare android phone.

The second image is the screenshot of Bluetooth settings when connected to the android phone which is currently being detected as a phone and I want that to be shown as a Bluetooth Audio device.


问:
Are printer drivers technically possible?
It seems that printer manufacturers like Canon provide a printing app for Android devices, from which you can print documents and images stored on your Android device, but not printer drivers. So you cannot just print from any app, in the way that you can print from any program on a computer with printer drivers installed.

Is there a technical reason why there are no regular printer drivers for Android devices? Or is it just a choice made by manufacturers?


问:
Pattern Lock Nokia 7.1 even thought i gave correct pass code
i am using Nokia 7.1 mobile phone. i have setup screen lock pattern and finger  print.
Now, i have problem with the phone like not able to unlock the phone eventhought i am giving correct pass code and finger print.
Now i don't know how to fix this issue in Nokia 7.1 phone, please suggest he to fix the issue. I have been restarted multiple time and i dont want to do factory reset.

Thanks in advance.


问:
EXT4 Mount gives this error "SELinux: mount invalid. Same superblock, different security settings"
I am trying to mount a second partition  (ext4 ) for my apps ( I guess its a bit outdated with adoptable storage but then ext4 isn't accepted FS for adoption for external card ) . I am on 9.0 ( Pie ) and all my SD partitions are mounted under /storage and some weird name .e.g.

```<code>/storage/ 6226b27a-ebc1-4fdd-b54c-096abc40c2b9
</code>```

Now I need my 2nd Partition to be mounted under /data/sdext2 but O.S already mounts it.
app2sd ( link2sd) gives me Mount script argument invalid argument . No matter what .

On digging further through OS logs I get this info

```<code>[   48.820728] EXT4-fs (mmcblk1p2): mounted filesystem with ordered data mode. Opts: nomblk_io_submit,errors=remount-ro
[   48.941276] EXT4-fs (mmcblk1p2): mounted filesystem with ordered data mode. Opts:
[   48.969786] sdcardfs: mounted on top of /mnt/media_rw/6226b27a-ebc1-4fdd-b54c-096abc40c2b9 type ext4
[   48.970918] Remount options were mask=18,gid=9997 for vfsmnt ffffffda2f7539e0.
[   48.971668] Remount options were mask=18,gid=9997 for vfsmnt ffffffda95617660.
</code>```

......

```<code>[  107.476736] SELinux: mount invalid.  Same superblock, different security settings for (dev mmcblk1p2, type ext4)
</code>```

What I did :

Umount partition as mount master under Terminal Emulator. Its umounted only in context but not everywhere. But in-spite of umount I cant seem to mount it under /data/sdext2

Whats happening  and how to work around .

On a side note. How do I manually assign mount point names  and prevent these weird names given by OS to the partitions
and on a 'side side' note. I am not even sure if this is the reason for invalid mount error as I read elsewhere its more of a benign FYI message.


问:
Linking social media data to SD card - how does Samsung do this without partitioning the SD card?
I am using a Samsung Galaxy On7, Android 6.0.1. In the latest update (released April 2018), they have added a feature such that you can store your social media content on SD card, but link it to the internal storage. For example, Whatsapp still doesn't support reading the SD card. If you enable the "Move to SD card" option, the phone will move all Whatsapp data from internal storage to SD card, but these will still be accessible when you open Whatsapp.

I know about the Link2SD app, which creates a second partition on SD card and treats it like internal memory. But here there is no such partition created. How does Samsung make this link? Is there any app available that can do this same thing (the app may ask for superuser access, I have no problem with that).


问:
Android version stable version?
I do not use my android phone for anything but making phone calls and browsing the web not logged into anything.

Is there an Android phone version or phone that is not upgradable.  I have noticed as the phone upgrades on both my iPhone and Android the versions of the phone gets slower.

Maybe android go or android one?

The Google Pixel works because you can install any ROM but is slightly to expensive.

Title: Android version stable version?


问:
Android : how to remove the downloaded android update
I have a securities concern. I installed a VPN software on my android and just after (the next day) android asks me do install an update (that is already downloaded via the VPN). I don't fully trust my VPN software and I can not trust that the downloaded update is legitimate. I would like to force Android to redownload this update but from OUTSIDE the VPN (so delete the downloaded file and let android redownload it). How to do that?</p>


问:
Printing photos off of Android phone with "Verifiable dates"?
How does one print photos from an Android phone with a date on it?

When the original photo doesn't show a date on the actual image?

OwnerDisplayName: Bob


问:
Lineage OS 16, Nandroid Backup Not Working
I am currently running the April 29th build of LineageOS for MicroG 16.0 on my OnePlus 5 (cheeseburger). I tried to update the device using the built in Updater, but the device just rebooted into TWRP and showed the TWRP logo screen for some time. After that, I got this error message:

```<code>Checking for MODEM build time-stamp 2019-07-18 14:56:39
Error: This package requires firmware version 9.0.7 or newer.
Please upgrade firmware and retry!
Updater process ended with ERROR: 7
Error installing zip file '@/cache/recovery/block.map'
Done processing script file
</code>```

After searching for a solution, I decided it would be best to just backup my data and reinstall Lineage.

After looking through my options, I decided a Nandroid backup through TWRP was my best option. So, I tried to take one. This was the result:

```<code>createTarFork() process ended with ERROR: 255
Backup Failed. Cleaning Backup Folder.
</code>```

If I adb pull my recovery.log, this is where I get my errors:

```<code>E:tar_open error opening '/data/media/0/TWRP/BACKUPS/[serial_number]/2019-08-10--23-11-06_lineage_cheeseburger-userdebug_9_PQ2A190405/data.ext4.win000'
Error creating backup.
I:Error creating tar '/data/media/0/TWRP/BACKUPS/[serial_number]/2019-08-10--23-11-06_lineage_cheeseburger-userdebug_9_PQ2A190405/data.ext4.win000' for thread 0
Error creating backup.
I:ERROR tarList for thread ID 0
Error creating backup.
I:InfoManager saving '/data/media/0/TWRP/BACKUPS/[serial_number]/2019-08-10--23-11-06_lineage_cheeseburger-userdebug_9_PQ2A190405/data.info'
createTarFork() process ended with ERROR: 255
</code>```

I read up about this type of error and found out that it means that those files have been corrupted and should be deleted. The strange thing is that the day before yesterday when I deleted the files in the /data/media/0/TWRP/BACKUPS/[serial_number]/ and then tried to perform the backup again, it regenerated files in the same directory, causing the same error. I also find it strange that the files that are causing the backup to fail seem to be backup files as well, although I've never performed a successful Nandroid backup on my device.

So, what can I do to fix this error and finally be able to backup and update my device?


问:
Changing Mac Address on Mi A1 running LineageOS - where to look to fix problem?
I have a rooted Mi A1, and upgraded to the latest LineageOS daily build (Pie). Most things work OK, however I can no longer change the MAC address of my device (which worked on stock). I'm trying to work out if this is something I can hack/fix.

I have downloaded a couple of programs to change the MAC address, and have also tried in an ADB shell.  What I noticed is that when the MAC address changes  the connection appears to go down, and then when it comes back up its reset to the original MAC address.

The driver appears to be wcnss_wlan and the chipset on the phone is, I think, MSM8960 (but could be wrong here).

When I manually try and bring the interface up at the command prompt using ip link set dev wlan up, it does not work (I can bring it down OK, and can change the MAC OK using ip link set dev wlan0 address ma:ac:ad:dr:es:ss ), and when I use the toggle on the phone the interface gets reset to its default MAC.

Can anyone advise a way to fix this, or point me (even vaguely) in a productive direction - ie where can I find where the MAC address is coded, how to I manually trigger a DHCP update?  How do I look at whats happening with WPA_SUPPLICANT ?


问:
How do I get rid of "the connected device is unable to access data" notification
When I connect my phone to my job computer the phone shows a "the connected device is unable to access data" dialog from time to time. I think this is just annoying - if I want to access files from my computer I would notice that when I try and if I don't I couldn't care less.

Is there a way to disable that popup from appearing? I'm using a Galaxy Note 9 (in case that make any difference).


问:
Recovery approach for lost partition and encrypted F2FS

The Problem and Mystery

My ZTE Axon 7 [Android 7] inexplicably wiped its emulated storage area /storage/emulated/0 while retaining all installed applications, albeit with settings wiped clean. There was also a 256GB sd-card mounted as a add-on, system space. I think it was configured as F2FS and encrypted. I've stopped using it and bought a new phone. I want to image the phone's internal memory and the sd-card, and recover what I can that wasn't backed up. I don't know the best approach, but know there are some hurdles, which I'm unsure how to approach.

What is the best way to image phone memory? Recovery mode and ADB?

The F2FS and internal memory may have been re-partitioned and/or reformatted

Getting the image would allow me to scan for text, strings, and file signatures

Where is the encryption key normally kept? Is it backed up anywhere?

The original file systems are likely encrypted, and would need a key

I know the phone would store this somewhere, but unsure how to retrieve it.

Key may have been overwritten or reset, since I didn't immediately realize something happenend, plus don't fully comprehend what did.

Is there any way to view the contents of a GDrive backup? Any chance it contains key?

There is some backup data on Google Drive, but haven't viewed yet

This backup may also have been overwritten, since I see no versioning info

Backup data is not very large. Maybe a few megabytes.

How did this happen? Does my story below add up?

I'm hoping there's an alternative cause and fix to this

How it happened

Not sure since I was using Android Auto for navigation and music, and the phone was normal. At some point the phone became "weird" with the wrong launcher, which I ascribed to accidentally pressing a wrong button and activating another launcher (I had several installed), and I switched to my wife's phone. Later I realized every app was "weird" and then checked the FS and realized everything, photos, docs, were missing even at the file system level.

Maybe I pushed a system upgrade prompt, or confirmed some other crazy phone action. I was driving and don't know.


问:
recovery of data on MMC protected internal memory device
I have a broken HTC Sensation with a forensics lab who are trying to recover the data from the phone's internal memory chip. The technician says he is unable to recover the data on the chip because the chip itself is MMC password protected. This is the first time he has ever encountered this on an internal memory chip. He added that he was mystified as to how an internal memory chip could become MMC password protected in the first place.

I should add that this phone belongs to me. It is not nor was it ever password protected.

Can anyone here offer any guidance on solving this problem? I simply refuse to believe that HTC have for the first time in the history of civilisation, created a perfect security measure and then installed it into a mid-price mobile phone handset.

Many thanks


问:
Settings crashes when I try to set a screen lock
I have a Google Pixel. The bootloader is unlocked, but the system software remains unmodified.

A few days ago, I booted into TWRP (flashboot boot twrp.img) to access the data partition. The encryption key for the data partition is encrypted with a key that is partly derived from the unlock code. I was under the impression that touchscreen input with TWRP would be very mininal due to it being a minimal recovery system, so I had figured that I would not be able to enter my password so TWRP could then mount the data partition. I search the internet for this question and the results said to remove the lock screen password. I did that and I was able to access the data partition while booted into TWRP.

I rebooted my phone into normal Android and I successfully set my lock screen password again, BUT I may be misremembering this and it may have been that I had unset my password, then set it back up, and THEN booted into TWRP for the first time. The problem now is that when I either:

Go into Settings and select Security & location > Screen lock

Press the box at the top of the main menu in Settings that says "Secure your phone"

Settings crashes. Now I cannot set a screen lock. Why is this happening and how do I fix this?

These are not solutions:

Wiping my phone.

Restoring from a backup.

Anything to do with syncing with Google.


问:
Android 9 "battery fully charged" icon flickers: What does it mean?
With my Samsung S10e phone fully charged, when I unplug it from USB then re-plug it in, the "battery fully charged" behaves like this:

appears and disappears a few time quickly

stays visible for 5 seconds

appears and disappears a few time quickly

stays visible for 5 5seconds

appears and disappears a few time quickly

stays visible forever

Question: What does that mean exactly? In particular, is it an indication that there is a kind of problem with the hardware or software?


问:
OS-independent app loading problem
My phone has an odd problem, and I don't know where to start in diagnosing it. Several apps started having problems opening, taking a very long time (sometimes several minutes) to open; sometimes they won't open at all, and a reboot will be needed. Interestingly, once the app has been opened for the first time, it won't have problems again until the next reboot.

So I reinstalled the OS, and the new one is an entirely different version of Android. And yet, the problem was not solved! So I started thinking about a hardware problem (reading the disk? using memory?), but I wouldn't know how to diagnose what it is, and if it's solvable or not. Any hints are appreciated. I understand this will not be enough information to solve it, but I will answer questions.

The phone is a Samsung Galaxy Note 3 with Lineage OS (unofficial, but the problem is present on two different, independently developed versions of the OS).

Title: OS-independent app loading problem


问:
trouble maker when I write email or username
When I want to write email or username, or when I search for topics e.g. on stack overflow, when I begin to write, I see immediately on the screen things I wrote in the past and sometimes, despite that I write something else, the previous typings replace them. It appens when I write to buy on Amazon or when I want to buy an airline ticket, when I want to write tags on a stack overflow site.

How can I neutralize this "help"…?

I'm browsing with Firefox, with a Google keyboard, my phone is a mi Max 3 working with Android 8.1.


问:
ADB shell gets "stuck" connecting to Samsung S10, must open other ADB shell to "unstuck" it
On Ubuntu, I often use adb shell and other operations such as adb push and adb pull over a USB cable.

On Nexus 5 it always worked perfectly. But since I switched to Samsung S10e I have this very surprising problem:

I open a terminal on my laptop, run adb shell.

I type normally in ADB shell (ls, typing enter, etc), the expected output appears.

As I continue typing, suddenly my typed character is not shown, as if the USB connection was stuck.

I have found a strange workaround: When that happens, I open another terminal and run adb shell in it.

Immediately, that "unstucks" the first terminal, and the "stucked" characters appear.

Now I can use the first terminal again, until it gets stuck again.

When that happens, I type a few characters in the second terminal, and that solves the problem again.

Inevitably as I repeat the trick several times, the second terminal gets stuck too.

When that happens, I open a third terminal, and that "unstucks" the first and second terminals.

Etc. Sometime I need to open a fourth terminal.

This also happens with other ADB commands.

Question: How to investigate the problem? Is there any Android setting that could mitigate or even solve the problem?


问:
Recent apps getting closed without closing them
Samsung S9 -
In the recent apps view, the apps that were used recently are getting closed automatically.
If you do not use an app for more than one hour, then the app gets closed.

My phone forced me for an update, but after the update the apps in the recent apps view were getting closed automatically.

In the previous versions / before the update, I manually needed to close them in the recent apps.

How to prevent the apps in the recent apps not to get closed?

Steps to reproduce the issue:

Open 10 apps.

Go to the navigation bar.

Hit the recent apps button.

You can see the few of the applications that were used recently

Wait for a period of 6-7 hours/not to use the app in that time frame.

Most of the apps were closed automatically without closing them in the recent apps.

I found others with the same issue here


问:
Term for decoding symbols / icons
The top of the phone often has symbols to indicate features such as battery life, cell tower signal strength, wifi strength, etc.

Is there a commonly accepted term for said symbols?  Usually there is a list of symbols and the symbol's meaning.  This list should have a name: what is the name of this list?

The idea is that the term for said list would be found in the phone's manual, when trying to lookup what an unknown symbol communicates.

Title: Term for decoding symbols / icons


问:
Settings keep resetting after restart Oppo ColorOS
I have an Oppo R17 (Model CPH1879) running ColorOS V5.2.1 based on Android 8.1.0.

The problem is that every time I restart my device or if its battery runs out, some of my settings are reset to default. Not all my settings, I'll make it clear.

I realized that it is mainly

The Auto-lock setting; keeps resetting to 15 seconds and I have to change it back to 2 minutes as it was,

My alarm ringtone is reset to the default ringtone whereas I keep changing it to a custom file.

As of now I am not even sure if anything else changes besides these 2.

Since the ColorOS is still relatively new, searching on Google got me absolutely nowhere. Anyone come across this before or know how to fix this?


问:
In which Android system file can I remove Wi-Fi password field?
If I would root my device based on Android (v4.0.4), which system file and how can I change to remove from the graphic interface the field where we manually type a password when connecting to new Wi-Fi hotspot?

ps. This is an additional and separate question to Which Android system file(s) should I change to connect only to specific Wi-Fi hotspots


问:
Dumpsys Meminfo reporting inconsistent values ((Free Ram + Used Ram + Lost Ram) > Total Ram) Nokia 1
Below is my log as stated in the title the value of Dumpsys Meminfo do not add up to total ram.

My device is NOKIA 1
Android 8.1.0

To reproduce these results I opened 10 apps using adb shell monkey and then took a dumpsys meminfo using This Command.

adb shell dumpsys -t 60 meminfo

My intution is

```<code>Free RAM + Used RAM + Lost RAM = Total RAM
416,633K + 760,054K + -17,123K = 1,159,564K

Total RAM (Though Summing) = 1,159,564 K
Total RAM (Reported by Dump Sys) = 951,952K
</code>```

Why is there a difference in Total RAM ?

Here is the App list

```<code>com.google.android.youtube
com.google.android.apps.messaging
com.google.android.music
com.android.contacts
com.google.android.calculator
com.android.chrome
com.android.camera2
com.alibaba.aliexpresshd
com.amazon.mShop.android.shopping
com.cam001.selfie
com.daraz.android
</code>```

I opened these apps with 20 second gaps to make sure that app opend completely.

```<code>  Total PSS by process:
       84,517K: com.google.android.apps.docs (pid 10596 / activities)
       71,280K: com.amazon.mShop.android.shopping (pid 10319 / activities)
       59,903K: com.alibaba.aliexpresshd (pid 9826 / activities)
       56,000K: system (pid 720)
       55,667K: com.hmdglobal.support (pid 10891)
       51,705K: com.android.systemui (pid 1161 / activities)
       40,915K: com.google.android.gms.persistent (pid 1529)
       32,720K: com.lenovo.anyshare.gps (pid 9140)
       29,314K: com.google.android.gms (pid 1680)
       24,049K: com.evenwell.UsageStatsLogReceiver (pid 9860)
       22,398K: com.android.chrome (pid 9588 / activities)
       20,676K: com.android.launcher3 (pid 1615 / activities)
       20,132K: com.uc.vmate (pid 7787)
       20,098K: com.google.android.inputmethod.latin (pid 1139)
       19,382K: video.like (pid 4663)
       18,346K: libweexjsb.so (pid 10111)
       18,100K: com.google.android.music:ui (pid 9020 / activities)
       18,004K: com.android.settings (pid 7279 / activities)
       16,362K: com.alibaba.aliexpresshd:channel (pid 10142)
       15,781K: com.android.vending (pid 7678)
       15,400K: com.android.chrome:sandboxed_process0 (pid 9632)
       13,429K: com.google.android.calculator (pid 9502 / activities)
       12,023K: surfaceflinger (pid 289)
       11,217K: com.uc.vmate:rainbow (pid 7889)
       10,448K: com.lenovo.anyshare.gps:transfer (pid 8380)
       10,311K: video.like:service (pid 9926)
       10,020K: camerahalserver (pid 426)
        9,585K: com.google.android.music:main (pid 9039)
        9,373K: com.android.phone (pid 1323)
        7,786K: com.opera.browser.beta (pid 9724)
        7,629K: com.google.android.partnersetup (pid 10869)
        6,198K: com.mediatek.ims (pid 1316)
        5,358K: android.process.acore (pid 8929)
        4,348K: merged_hal_service (pid 282)
        4,096K: com.evenwell.OTAUpdate (pid 1570)
        4,094K: android.hardware.graphics.composer@2.1-service (pid 280)
        4,033K: com.google.process.gapps (pid 7909)
        4,033K: mediaserver (pid 420)
        3,900K: audioserver (pid 409)
        3,849K: android.hardware.audio@2.0-service-mediatek (pid 273)
        3,751K: vtservice (pid 415)
        3,652K: com.evenwell.pushagent (pid 1552)
        3,639K: android.process.media (pid 7353)
        3,613K: com.google.process.gservices (pid 1633)
        3,557K: media.codec (pid 424)
        3,472K: /init (pid 1)
        3,219K: com.evenwell.autoregistration (pid 7239)
        2,901K: zygote (pid 407)
        2,900K: drmserver (pid 413)
        2,883K: com.android.chrome:webview_service (pid 10008)
        2,823K: mtkmal (pid 297)
        2,705K: media.extractor (pid 419)
        2,701K: com.evenwell.batteryprotect (pid 7220)
        2,691K: mtkrild (pid 760)
        2,604K: mnld (pid 406)
        2,588K: rilproxy (pid 849)
        2,546K: com.android.smspush (pid 1708)
        2,539K: cameraserver (pid 411)
        2,444K: com.evenwell.emm (pid 1546)
        2,383K: com.android.partnerbrowsercustomizations (pid 9618)
        2,158K: mtk_agpsd (pid 432)
        1,825K: wpa_supplicant (pid 1241)
        1,414K: netd (pid 421)
        1,392K: android.hardware.wifi@1.0-service (pid 281)
        1,386K: vold (pid 262)
        1,313K: logd (pid 251)
        1,290K: android.hardware.drm@1.0-service.widevine (pid 278)
        1,237K: vendor.mediatek.hardware.wfo@1.0-service (pid 284)
        1,234K: wfca (pid 298)
        1,186K: ueventd (pid 205)
        1,157K: vendor.mediatek.hardware.pq@2.0-service (pid 435)
        1,151K: keystore (pid 417)
        1,123K: installd (pid 416)
        1,085K: wificond (pid 423)
        1,082K: aal (pid 408)
        1,068K: android.hardware.sensors@1.0-service-mediatek (pid 425)
          959K: ged_srv (pid 1516)
          958K: hwservicemanager (pid 253)
          857K: mediadrmserver (pid 418)
          852K: android.hardware.keymaster@3.0-service (pid 261)
          840K: gatekeeperd (pid 437)
          827K: dm_agent_binder (pid 412)
          797K: storaged (pid 422)
          787K: thermalserviced (pid 290)
          771K: android.hardware.broadcastradio@1.1-service (pid 275)
          734K: healthd (pid 285)
          715K: ccci_fsd (pid 292)
          703K: android.hardware.bluetooth@1.0-service-mediatek (pid 274)
          690K: android.hardware.cas@1.0-service (pid 276)
          669K: ccci_mdinit (pid 294)
          667K: vendor.mediatek.hardware.imsa@1.0-service (pid 283)
          665K: android.hardware.gatekeeper@1.0-service (pid 279)
          662K: ip6tables-restore (pid 481)
          659K: netdagent (pid 443)
          652K: adbd (pid 1503)
          637K: vtservice_hidl (pid 272)
          629K: android.hardware.configstore@1.0-service (pid 277)
          615K: fuelgauged (pid 291)
          598K: servicemanager (pid 252)
          569K: gsm0710muxd (pid 696)
          554K: epdg_wod (pid 442)
          553K: android.hidl.allocator@1.0-service (pid 271)
          553K: lmkd (pid 287)
          552K: dumpsys (pid 10758)
          541K: vndservicemanager (pid 254)
          541K: bbs_fih_log (pid 330)
          540K: program_binary_service (pid 438)
          516K: thermald (pid 414)
          511K: tombstoned (pid 441)
          510K: batterywarning (pid 410)
          485K: ipsec_mon (pid 430)
          457K: iptables-restore (pid 480)
          451K: pandoraservice (pid 306)
          424K: ccci_rpcd (pid 296)
          409K: sysenv_daemon (pid 434)
          405K: wifi2agps (pid 436)
          395K: thermal (pid 427)
          386K: wmt_launcher (pid 300)
          385K: storageproxyd (pid 444)

  Total PSS by OOM adjustment:
      204,221K: Native
           55,667K: com.hmdglobal.support (pid 10891)
           18,346K: libweexjsb.so (pid 10111)
           12,023K: surfaceflinger (pid 289)
           10,020K: camerahalserver (pid 426)
            7,629K: com.google.android.partnersetup (pid 10869)
            4,348K: merged_hal_service (pid 282)
            4,094K: android.hardware.graphics.composer@2.1-service (pid 280)
            4,033K: mediaserver (pid 420)
            3,900K: audioserver (pid 409)
            3,849K: android.hardware.audio@2.0-service-mediatek (pid 273)
            3,751K: vtservice (pid 415)
            3,557K: media.codec (pid 424)
            3,472K: /init (pid 1)
            2,901K: zygote (pid 407)
            2,900K: drmserver (pid 413)
            2,823K: mtkmal (pid 297)
            2,705K: media.extractor (pid 419)
            2,691K: mtkrild (pid 760)
            2,604K: mnld (pid 406)
            2,588K: rilproxy (pid 849)
            2,539K: cameraserver (pid 411)
            2,158K: mtk_agpsd (pid 432)
            1,825K: wpa_supplicant (pid 1241)
            1,414K: netd (pid 421)
            1,392K: android.hardware.wifi@1.0-service (pid 281)
            1,386K: vold (pid 262)
            1,313K: logd (pid 251)
            1,290K: android.hardware.drm@1.0-service.widevine (pid 278)
            1,237K: vendor.mediatek.hardware.wfo@1.0-service (pid 284)
            1,234K: wfca (pid 298)
            1,186K: ueventd (pid 205)
            1,157K: vendor.mediatek.hardware.pq@2.0-service (pid 435)
            1,151K: keystore (pid 417)
            1,123K: installd (pid 416)
            1,085K: wificond (pid 423)
            1,082K: aal (pid 408)
            1,068K: android.hardware.sensors@1.0-service-mediatek (pid 425)
              959K: ged_srv (pid 1516)
              958K: hwservicemanager (pid 253)
              857K: mediadrmserver (pid 418)
              852K: android.hardware.keymaster@3.0-service (pid 261)
              840K: gatekeeperd (pid 437)
              827K: dm_agent_binder (pid 412)
              797K: storaged (pid 422)
              787K: thermalserviced (pid 290)
              771K: android.hardware.broadcastradio@1.1-service (pid 275)
              734K: healthd (pid 285)
              715K: ccci_fsd (pid 292)
              703K: android.hardware.bluetooth@1.0-service-mediatek (pid 274)
              690K: android.hardware.cas@1.0-service (pid 276)
              669K: ccci_mdinit (pid 294)
              667K: vendor.mediatek.hardware.imsa@1.0-service (pid 283)
              665K: android.hardware.gatekeeper@1.0-service (pid 279)
              662K: ip6tables-restore (pid 481)
              659K: netdagent (pid 443)
              652K: adbd (pid 1503)
              637K: vtservice_hidl (pid 272)
              629K: android.hardware.configstore@1.0-service (pid 277)
              615K: fuelgauged (pid 291)
              598K: servicemanager (pid 252)
              569K: gsm0710muxd (pid 696)
              554K: epdg_wod (pid 442)
              553K: android.hidl.allocator@1.0-service (pid 271)
              553K: lmkd (pid 287)
              552K: dumpsys (pid 10758)
              541K: vndservicemanager (pid 254)
              541K: bbs_fih_log (pid 330)
              540K: program_binary_service (pid 438)
              516K: thermald (pid 414)
              511K: tombstoned (pid 441)
              510K: batterywarning (pid 410)
              485K: ipsec_mon (pid 430)
              457K: iptables-restore (pid 480)
              451K: pandoraservice (pid 306)
              424K: ccci_rpcd (pid 296)
              409K: sysenv_daemon (pid 434)
              405K: wifi2agps (pid 436)
              395K: thermal (pid 427)
              386K: wmt_launcher (pid 300)
              385K: storageproxyd (pid 444)
       56,000K: System
           56,000K: system (pid 720)
       77,468K: Persistent
           51,705K: com.android.systemui (pid 1161 / activities)
            9,373K: com.android.phone (pid 1323)
            6,198K: com.mediatek.ims (pid 1316)
            4,096K: com.evenwell.OTAUpdate (pid 1570)
            3,652K: com.evenwell.pushagent (pid 1552)
            2,444K: com.evenwell.emm (pid 1546)
       84,517K: Foreground
           84,517K: com.google.android.apps.docs (pid 10596 / activities)
       88,556K: Visible
           40,915K: com.google.android.gms.persistent (pid 1529)
           29,314K: com.google.android.gms (pid 1680)
           15,781K: com.android.vending (pid 7678)
            2,546K: com.android.smspush (pid 1708)
       20,098K: Perceptible
           20,098K: com.google.android.inputmethod.latin (pid 1139)
        6,858K: A Services
            3,639K: android.process.media (pid 7353)
            3,219K: com.evenwell.autoregistration (pid 7239)
       20,676K: Home
           20,676K: com.android.launcher3 (pid 1615 / activities)
       80,608K: B Services
           59,903K: com.alibaba.aliexpresshd (pid 9826 / activities)
           18,004K: com.android.settings (pid 7279 / activities)
            2,701K: com.evenwell.batteryprotect (pid 7220)
      320,869K: Cached
           71,280K: com.amazon.mShop.android.shopping (pid 10319 / activities)
           32,720K: com.lenovo.anyshare.gps (pid 9140)
           24,049K: com.evenwell.UsageStatsLogReceiver (pid 9860)
           22,398K: com.android.chrome (pid 9588 / activities)
           20,132K: com.uc.vmate (pid 7787)
           19,382K: video.like (pid 4663)
           18,100K: com.google.android.music:ui (pid 9020 / activities)
           16,362K: com.alibaba.aliexpresshd:channel (pid 10142)
           15,400K: com.android.chrome:sandboxed_process0 (pid 9632)
           13,429K: com.google.android.calculator (pid 9502 / activities)
           11,217K: com.uc.vmate:rainbow (pid 7889)
           10,448K: com.lenovo.anyshare.gps:transfer (pid 8380)
           10,311K: video.like:service (pid 9926)
            9,585K: com.google.android.music:main (pid 9039)
            7,786K: com.opera.browser.beta (pid 9724)
            5,358K: android.process.acore (pid 8929)
            4,033K: com.google.process.gapps (pid 7909)
            3,613K: com.google.process.gservices (pid 1633)
            2,883K: com.android.chrome:webview_service (pid 10008)
            2,383K: com.android.partnerbrowsercustomizations (pid 9618)

  Total PSS by category:
      120,452K: .dex mmap
       85,362K: .so mmap
       77,628K: Native
       68,219K: .apk mmap
       65,610K: Dalvik
       46,060K: GL mtrack
       25,774K: .art mmap
       25,312K: Dalvik Other
       24,384K: Unknown
       16,813K: .oat mmap
       14,974K: EGL mtrack
       12,700K: Stack
       12,308K: Other mmap
        1,326K: Other dev
          730K: Ashmem
          709K: .ttf mmap
           76K: .jar mmap
            0K: Cursor
            0K: Gfx dev
            0K: Other mtrack

  Total RAM:   951,952K (status normal)
   Free RAM:   416,633K (  320,869K cached pss +    72,320K cached kernel +    23,444K free)
   Used RAM:   760,054K (  639,002K used pss +   121,052K kernel)
   Lost RAM:   -17,123K
       ZRAM:   104,800K physical used for   357,032K in swap (  428,372K total swap)
     Tuning: 128 (large 256), oom   184,320K, restore limit    61,440K (low-ram)
</code>```

Addition Information DUMPSYS, VMSTAT

```<code>Total RAM:   951,952K (status normal)
 Free RAM:   420,263K (  286,451K cached pss +   112,720K cached kernel +    21,092K free)
 Used RAM:   729,271K (  610,175K used pss +   119,096K kernel)
 Lost RAM:    -7,523K
     ZRAM:    86,648K physical used for   322,252K in swap (  428,372K total swap)
   Tuning: 128 (large 256), oom   184,320K, restore limit    61,440K (low-ram)

C:\Users\ab>adb shell /system/bin/vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 4  1 318204  27884    900 335664  477  667  2422   747    0 2797 20 18 62  1

C:\Users\ab>adb shell /system/bin/free -k
                total        used        free      shared     buffers
Mem:           951952      903968       47984        1868         900
-/+ buffers/cache:         903068       48884
Swap:          428372      324320      104052
</code>```


问:
Why does my twrp custom recovery not work?
I've recently wanted to root my phone I unlocked the bootloader and followed a tutorial of how to add the twrp custom recovery I complete it and everything seems fine but when I turn on my custom recovery it just shows the android recovery

My phone is a allwiev p7_pro
I've used the recovery file from XDA developers

OwnerDisplayName: DarkneSSs -Made-M-


问:
Whatsapp isn't performing the expected daily backup
I have a Galaxy S10e with Whatsapp backup setup to backup daily to google drive, according to the guidelines on Samsung's website:

However the backup isn't taking place automatically.  It only backs up if I manually initiate it.  What could be the reason that Whatsapp isn't doing it?


问:
Part of mobile screen not working
I have an Android mobile Meizu m5 which has a Flyme OS.Until recently the phone has been working just fine. However recently i noticed that the lower part of the screen has stopped working. I tried the touch detector tool and it also didnt work in that specific area which is

On random occasions the screen stated acting weird and clicking random buttons. Antiviruses didnt catch any problem however the antivirus of meizu showeved that there was something in the TouchPal. I transfered my contacts and sms and did a full factory reset however the issue still presisted and then meizus owns antivirus also didnt give any issue.I also took off the screen protector but still no luck.

Waiting for help. Thanks

OwnerDisplayName: Talha Israr

Title: Part of mobile screen not working


问:
Galaxy s9+ not charging via USB-C cable and not quick charging at all
I ran into a problem with my Galaxy s9+ recently, it won't charge at all using my Samsung 25 Watt Wall Charger and also won't charge using my Aukey 26800mah power bank when connected via USB-C. It however will charge when I connect my phone to the power bank using a USB-A to USB-C cable. As of right now there is no way I can quick charge my phone, even using a brand new Samsung charger that came in the box will not quick charge my phone, only cable charging.

What chargers I tested:

The in the box Samsung charger

This will charge my phone, but only "cable charging", no fast charging

Samsung 25 Watt Wall Charger

This one won't charge my phone at all

Aukey PA-6Y

This one charges my phone with quick charge, but only when using the USB-A connector, and won't charge my phone when using the USB-C port

This one is also an interesting case, as it has a USB-A and USB-C plug

Lenovo 65 Watt laptop charger

This one won't charge my phone at all

I tested all of these chargers at 2 different physical locations and 2 different sockets at each location so I cannot possibly be a problem with the Socket. I also tested all these chargers with my brothers Galaxy s10+ and each of these chargers charge his phone with quick charging.

But I have also been seeing some very weird behaviour from my phone. For example: I bought the 25 Watt Samsung wall charger brand new and tested it out, it worked perfectly. A day later I wanted to plug in my phone again and it won't charge anymore, just for me to unplug it, turn around the USB-C connector and plug it in and to work again. Once more a day later I wanted to charge my phone again, only for it to not work at all, no matter the USB-C orientation (which shouldn't matter anyways).

I've exhausted every opportunity at my disposal and don't know what could possibly be the problem. I also brought in my phone to my cell carrier (where I have it insured) only for them to say "it quick charges with this charger, I don't see a problem". The only constant I was able to find was that my phone won't charge when using a USB-C to USB-C cable, but will charge (and sometimes quick charge) when using a USB-A to USB-C cable (I tried this on the Aukey charger and the two Samsung chargers back this up)

So my question is this: Does anyone have any idea what could be causing this and how I could fix this?


问:
Where can I modify to make a custom rom allow debug any apk without android:debuggable="true" in AndroidManifest.xml?
I am try to debug a android app which have integrity check. Then I can not decompile it and change AndroidManifest.xml. And this app do not work in emulator. Therefore, I try to flash a custom ROM which can debug any app without flag android:debuggable="true" in my real devices. I tried changing the ro.debuggable=1 in default.prop in boot.img then flash to my device. But It did not change anything. Please give me some suggestion. Thank you very much.
Edit: custom ROM I use is CarbonRom this is the link: https://basketbuild.com/devs/CarbonROM/.OLD/Nougat/sirius</p>


问:
Google drive high data usage
I'm not sure if this is the right place to post...

Yesterday, i opened Google drive to check and spreadsheet and everything looked fine. Today i see that this night Google drive has used about 600MB of mobile data on the background. It's been 2 weeks since i connected to a WiFi network and around 1 month since i opened Drive. Obviously, i have now disabled background data usage for that app on Android settings but I'm afraid that this can happen again with another app.

What has been using that much mobile data (maybe sync or updates?) and how can i avoid this happening in the future?

Is it safe to disable background data usage on every app (except messaging apps)?

Thanks and sorry for my bad English.

Title: Google drive high data usage


问:
Purpose of sdcardwritable file
In some directories there's .sdcardwritable file. It's a empty file. What is purpose of this file?</p>

Title: Purpose of sdcardwritable file


问:
Can I get non ASCII numerals globally (without rooting my device)?
I'm using 'Redmi note 7 pro'. This device has a huge language support, but unfortunately it does not handle numerals efficiently. It supports non-ASCII numerals in some places (eg. dates, phone numbers) but doesn't support them in some places (eg. Dialpad, time)

Is there any way to make this setting global (and not local)?

Is there any software which can change the UI in a way which enables unicode everywhere?


问:
enable screen mirroring on galaxy S7 (broken display + locked by sequence) with keyboard
I have a Galaxy S7 device with broken and black screen. The phone is locked by screen sequence (pattern).

I would like to activate the screen mirroring on it to backup data, but it is not possible to use touch screen.
So I have bought an OTG cable to connect a mouse or keyboard to my phone.
The problem is that i don't know which steps I need to perform to tap the screen mirroring button on the top menu.

Is there a way to know the steps to do for this purpose?

Or, is there an alternative way to access on phone?

I've tried with Vysor software app, but it is needed that USB debugging is activated on phone, so maybe I need to know the steps to activate USB debugging via keyboard.


问:
Google keeps moving my (favourite) contacts to the "other contacts" section in Google Contacts
So, this has been bugging me for a while. A few months ago, I wanted to call up an old friend of mine, but couldn't find his contact anywhere. I just wrote it off as weird bug (maybe user error on my side) and wrote him on Instagram instead. This happend again and again, with different contacts (all of which I had saved on Google for years, even starred contacts).

When I entered the web version of contacts, I realised that they weren't actually being deleted, but rather moved into a section called "other contacts". The little info button on the web version just tells me to check the settings in "my google account" to control how those contacts are managed (very specific).

Moving the contact back into the normal list does not fix the issue. They'll disappear again sooner or later, more often than not even twice a day. This seems to only happen to a certain group of contacts (around 70ish out of 170), with no discernible pattern as far as I am concerned. I already checked the permissions on my phone, nothing out of the ordinary there either. Also exported all contacts, cleaned up the csv, deleted everything in GC and uploaded them again. Same issue persists.

Any help on the issue would be greatly appreciated, because this is driving me insane. Thanks in advance.


问:
Fastboot Xiaomi system partition problem
I am trying to upgrade Xiaomi Mi A2 Lite to Android Pie via fastboot ROM images. It was on Oreo, initially. Had TWRP

installed in boot.img because it is an A/B slots device. TWRP is officially supported.
Had made a full TWRP backup, also system_image and vendor_image, which are exact copies of the whole system. Then

tried official Xiaomi fastboot Pie images, and system.img doesn't flash. Other smaller in size system images I flashed to see

what would happen do go through, but they don't work. Pie image is 2.1 GB. Other partitions are all flashed.
Each attempt via Xiaomi flash tool ends with: Chunk data size exceeds partition size.
Log:
$fastboot -s 08f97d930705 flash system_a C:\XiaoMi\XiaoMiFlash\Source\ThirdParty\Google\Android

\daisy_global_images_V10.0.10.0.PDLMIXM_9.0\images\system.img   ||
10:26:06 AM  08f97d930705:target reported max download size of 534773760 bytes
10:26:06 AM  08f97d930705:sending sparse 'system_a' 1/3 (462332 KB)...
10:26:06 AM  08f97d930705:OKAY  59.062s:writing 'system_a' 1/3...
10:26:06 AM  08f97d930705:flashSuccess False

Fastboot flash_all.bat gives:
fastboot  getvar product   2>&1  | findstr /r /c:"^product: *d
aisy"   ||
The system cannot find message text for message number 0x8 in the message file f
or System.

Fastboot flash system sends sparse chunks and gives:
data too large

So, what gives? Any ideas greatly appreciated. Oh, TWRP boots, but can't use touchscreen at all, no response

whatsoever, can't restore my perfect Oreo backup, and wanted to go to Pie and cutom ROMs anyway.
If anybody can shed some light, I will be grateful.

Also tried flashing different boot images from Pie and Oreo and different TWRP versions than the latest, nothing works.


问:
"install zip from sd card" missing on Samsung Ace
When I go into the recovery mode I am missing the option "install zip from sd card". I have installed the Android 2.3.6 DDKQ8 Fimware (http://www.youtube.com/watch?v=7L_w-MNxAzE). How can I get this option to appear?</p>


问:
Pixel keeps removing Smart Lock devices
Phone Google Pixel

OS Android 9

I connect my phone to my car using Bluetooth, and to use it hands free it must be unlocked. I use Smart Lock to achieve this, by adding my car as a Bluetooth device to Smart Lock.

However, sometimes the device is removed from the list, and I can't figure out why.

Why is Android removing my Smart Lock devices?

Title: Pixel keeps removing Smart Lock devices


问:
How can I block ads in Facebook videos
I have installed AdGuard Pro and have installed all the filters.

Nearly every video I watch on Facebook (only when using my Android phone) becomes interrupted by a video ad.

In contrast, my partner also has AdGuard Pro on a Android and she experiences zero ads during facebook videos. It seems that we have the same setup, however I receive ads and she doesn't.

I have been trying to figure out how to block these ads for over 1 year.

Please help.

Thank you

Title: How can I block ads in Facebook videos


问:
Is it possible to prevent an android from slowing down in just 2 or 3 years or even 4 years
I know that SSDs wear out with time but it takes a long amount of time for the wear out noticeable affect performance (not 2 or three years). I can TRIM the SSD as far as I know to bring back it's old performance. I believe that RAM and CPUs/GPUs don't slow down with time (not 2 years that is usually the amount of time after which people start feeling like they need a new phone). So is it possible for a phone to be as fast as it was 2 years ago if the apps in the current age are also not more CPU demanding than they were 2 years ago?
PS. also my last question is unanswered so please consider replying to that</p>


问:
How does an app (e.g. Whatsapp) automatically detect when the phone receives a 2FA SMS verification code without being granted SMS read permissions?
When installing some apps (for example Whatsapp) the user is required to receive a verification code on the phone via SMS.

I have noticed that some apps automatically verify this code as soon as the text message is received by the phone, without the user having to open the SMS message or type the code manually. The app does this without being granted any permissions by the user to access or read their calls and texts.

How is this possible, and is it a privacy or security concern?


问:
How to recover personal data on an Android phone which is in a bootloop?
Is there a way to recover the internal storage (images, video, photos, notes, app data, music, etc) of an Android phone which is currently in a bootloop?

Additional info:

Wiping the cache partition in recovery mode does not solve the bootloop issue.

The phone is not rooted.

USB debugging (hopefully) has been enabled prior to the soft-bricking.

The bootloop occurred after the battery run out of power.

The phone is SAMSUNG Galaxy Note 4