问:
should I update my Android System version 7.1.1 to 8.0 in a phone Z835?
Hello I am new here and I have phone android mark ZTE model Z835 and I would  like update but I dont know if my phone support tha update.

details about my phone:

model: Z835

Android version: 7.1.1

if you need more information about my phone could you comment bellow and I give you more information.


问:
How to modify the "systemless hosts” file under the newer Magisk?
It seems to be under /system_root/etc but the hosts file really is just a symbolic link to /system/etc/hosts.

How to modify the "systemless hosts” file under the newer Magisk?

ContentLicense: CC BY-SA 4.0


问:
Retrieve deleted file Android droid 2

Possible Duplicate:

  How can I recover a deleted file on Android?

I deleted a file from my droid 2 -Android 2.2. I am not trying to retrieve the file(jpg). I have used Astro to look at the file system and dumped all the camera pictures(as this picture was taken with the Motorola droid 2) but have not been able to retrieve the image.

Is there any way I can retrieve the image from the droid 2 that I have deleted ? This picture was taken on July 15th, 2011 before Google+ days.
I have Windows desktops at my disposal.

TIA,
Vijay

OwnerDisplayName: Vijay

ContentLicense: CC BY-SA 3.0

Title: Retrieve deleted file Android droid 2


问:
"Save as" like window's saving
I see that in Android (MiMax 2 with Android 7) the downloads fall in the same and unique folder. I have a Dropbox. In the Dropbox I can save my files offline. But when I want to move a file from the downloads to the Dropbox, and make it available offline, it seems like it uploaded and downloaded in two steps. Can I make this in one step, i.e to download from a website in Dropbox as outline available?</p>

Title: "Save as" like window's saving


问:
Symbolic link permission denied
I'm trying to create a symbolic link on my Android N phone, so that my photos are accessible from the Pictures folder. I want to be able to sync all my pictures in a single folder using Syncthing.

My phone isn't rooted, so I booted into a TWRP image using fastboot boot twrp.img, where I have root access to the filesystem. I was then able to log in using adb shell, create the symlink and change its owner.

```<code>cd /data/media/0/DCIM
mv Camera Camera.bak
ln -s ../Pictures/Camera Camera
chown -h media_rw:media_rw Camera
</code>```

Unfortunately the camera app fails to open, with an error message saying No storage found. Attempting to navigate to the symlink results in a Permission denied error.

Is there a way to get this working properly?

Note that in Android /data/media is mounted to /storage/emulated. The filesystem of /data is ext4, which supports symlinks, and the link works correctly from within TWRP.

Title: Symbolic link permission denied


问:
Insert ROM in PDA file
I have a problem. I am new in the domain of android customization and that is why I am testing.

I have a PDA file for my old GT-S6102 Galaxy Y, which contains the following files:

boot.img

param.lfs

Sbl.bin

system.img

userdata.img

I also downloaded a custom ROM from the internet called evo_x2.1 (evo_x2.1.zip) which contains the following files:

META-INF (folder)

system (folder)

installbusybox (file)

Normaly this file is supposed to be put on /sdcard and update the system partition only from recovery mode.

But I have a question: Can I edit my PDA file mentioned above by inserting this ROM in it? (so that when I flash this firmware with odin into my phone I will no longer have to update it with this ROM separately afterwards, manually)

I tried to create a system.img which contained the files included in the ROM file and replaced the system.img in the PDA file with the system.img I just created from the ROM file.But when I try to flash the PDA with Odin, it crashes while analyzing the file.

NOTE: there is no md5 hashsum at the end of the PDA so there is no problem concerning the integrity of the file.

Thank you, and any observations are welcomed.

Title: Insert ROM in PDA file


问:
Every time I walk past a hotel
...my phone thinks I need to know what amenities the hotel has. I've managed to shut off most of the other annoying alerts my phone wanted to throw out, but this one I haven't found in the menus. Where do I go to tell my phone I don't need to know about every hotel?</p>

Title: Every time I walk past a hotel


问:
Make the home button go the middle screen?
With Android 8.1, the wallpaper can cover all three screens. So when you move from the first screen to the second, and from the second to the third, the wallpaper pans to a different part.

This is a cool effect.

How can I make my home button take me to the second screen -- in the middle of 1 & 3, so the wallpaper shows the cool stuff when I first launch into my phone.


问:
Routing call audio to HDMI
I have samsung S5 running android marshmallow. I have connected it to my TV via hdmi cable.  Whenever I make a  whatsapp video call to S5,    video is shown on TV but call audio comes only from phone speaker, not from TV speaker.

What do I need to do to route call audio to tv speaker ?
I have tried soundabout app from playstore, but it does not seem to be working. I have rooted it. Any command from terminal that could do the trick or any other app ?

Title: Routing call audio to HDMI


问:
Oreo 8.1 - Trouble enabling ADB for system by modifying /system/build.prop in TWRP adb shell
I've followed https://gist.github.com/varhub/7b9555cdd1e5ad785ffde2300fcfd0bd and have doublechecked that the build.prop is indeed modified i.e. system was mounted in read-write mode.

Unfortunately after reboots, the /data/property/persist.sys.usb.config resets itself to just mtp (instead of mtp,adb).

Any ideas what I am missing? I have to do this via adb since I am working on a headless phone with a broken screen (touch/display not working at all).


问:
Missing internal SD card in /dev/block, phone won't start
Yesterday my Samsung Galaxy Note 2 froze I'd say. The phone was locked and when I attempted to unlock it, it didn't respond (black display, just the led blinking). So I shut it down with holding power button until it stopped, then tried to power it up. The phone stucked on the Samsung logo booting part.

Currently I can't even get there cleanly, my screen is stucked on the battery image e.g. when you plug in the phone when charging, but the logo is frozen (normally there is a gif showing a charging battery). When I go to recovery and choose to reboot the system (to normal mode, not recovery), I can get pass the battery image, but I'm stuck on the Samsung logo again.

I have Samsung's stock Android 4.4, rooted, with CWM recovery. I can get into the phone when in recovery mode (power+volup+home, ClockworkMod Recovery v6.0.4.3), but even through the recovery menu I get only Can't mount backup path. or E:Can't mount /sdcard when I try to e.g. backup the phone (at least to show whether the damn thing mounts). When I go to the section in CWM where I can attempt to mount (there is format also, but I haven't done it yet, most likely even won't work because of the mounting) these:

/efs

/system

/cache

/preload

/data

on each of the options I get only: Error mounting <...>.

When I try to wipe the cache, I get this:

E:format_volume: make_extf4fs failed on /dev/block/mmcblk0p12

When I try wiping dalvik cache, nothing appears in the log.

On each try to actually do something in CWM I get this in the log:

```<code>E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/log
E:Can't mount /cache/recovery/last_log
E:Can't open /cache/recovery/last_log
</code>```

I can reboot to bootloader, but (perhaps obviously) adb doesn't connect to the device because it's not even showing in the list nor able to get it via adb usb.

I can get into the phone with adb only when in recovery mode, so I checked the default locations e.g. /data/data, /sdcard, /system and everything in there seems dead, nothing is mounted.

/

```<code>boot                 fstab.smdk4x12       sbin
cache                init                 sd-ext
data                 init.rc              sdcard
datadata             internal_sd          seapp_contexts
default.prop         lpm.rc               sepolicy
dev                  mnt                  storage
efs                  preload              sys
emmc                 proc                 system
etc                  property_contexts    tmp
external_sd          recovery             ueventd.goldfish.rc
file_contexts        res                  ueventd.rc
fstab.goldfish       root                 ueventd.smdk4x12.rc
</code>```

/dev

```<code>HPD                    input               ttyGS2
__properties__         ion                 ttyGS3
akm8963                keychord            ttyS0
alarm                  kmem                ttyS1
android_adb            kmsg                ttyS2
ashmem                 link_pm             ttyS3
binder                 log                 ttySAC0
block                  mali                ttySAC1
bus                    mem                 ttySAC2
bus_dma_throughput     mobicore            ttySAC3
console                modem_br            tun
cpu_dma_latency        mtp_usb             tzic
device-mapper          multipdp            uhid
display_frequency      network_latency     uinput
dun                    network_throughput  ump
dvfs_response_latency  null                umts_boot0
ecryptfs               pn544               umts_csd
exynos-mem             ppp                 umts_ipc0
fimg2d                 psaux               umts_loopback0
fmradio                ptmx                umts_ramdump0
full                   pts                 umts_rfs0
fuse                   random              umts_router
graphics               rfkill              urandom
i2c-0                  rtc0                usb_accessory
i2c-1                  rtc1                vcs
i2c-12                 s3c-mem             vcs1
i2c-14                 s3c-mfc             vcsa
i2c-15                 s5p-smem            vcsa1
i2c-17                 snd                 video0
i2c-19                 socket              video1
i2c-21                 srp                 video11
i2c-22                 ssp_sensorhub       video12
i2c-3                  sw_sync             video16
i2c-4                  tspdrv              video2
i2c-5                  tty                 video20
i2c-6                  tty0 - 63           video3
i2c-7                  ttyGS0              xt_qtaguid
i2c-8                  ttyGS1              zero
</code>```

~ # ls /dev/block

```<code>ls /dev/block
loop0       loop4       mmcblk0p12  ram11       ram15       ram5        ram9
loop1       loop5       ram0        ram12       ram2        ram6        vold
loop2       loop6       ram1        ram13       ram3        ram7
loop3       loop7       ram10       ram14       ram4        ram8
</code>```

mmcblk0p12 is a /cache partition, however it's sometimes missing. I don't see the device (mmcblk0) there anyway, so perhaps it's just some quirk from CWM. I can't mount it to /cache or custom folder too:

~ # mount /dev/block/mmcblk0p12 /testfolder

```<code>mount /dev/block/mmcblk0p12 /testfolder
mount: mounting /dev/block/loop0 on /testfolder failed: Invalid argument
</code>```

I tried to investigate where is the device I'm looking for (mmcblk0) and its partitions (mainly mmcblk0p16 i.e. /data) via dmesg:

dmesg output(too long for question)

~ # cat fstab.goldfish

```<code>cat fstab.goldfish
# Android fstab file.
#<src>                                                  <mnt_point>         <type>    <mnt_flags and options>                              <fs_mgr_flags>
# The filesystem that contains the filesystem checker binary (typically /system) cannot
# specify MF_CHECK, and must come before any filesystems that do specify MF_CHECK
/dev/block/mtdblock0                                    /system             ext4
      ro,barrier=1                                         wait
/dev/block/mtdblock1                                    /data               ext4
      noatime,nosuid,nodev,barrier=1,nomblk_io_submit      wait,check
/dev/block/mtdblock2                                    /cache              ext4
      noatime,nosuid,nodev,nomblk_io_submit,errors=panic   wait,check
/devices/platform/goldfish_mmc.0                        /storage/sdcard     vfat
      defaults                                             voldmanaged=sdcard:auto
</code>```

~ # df

```<code>df
Filesystem           1K-blocks      Used Available Use% Mounted on
tmpfs                   923748        48    923700   0% /dev
tmpfs                   923748         0    923748   0% /storage
tmpfs                   923748         0    923748   0% /mnt/secure
tmpfs                   923748         0    923748   0% /mnt/fuse
</code>```

~ # mount

```<code>mount
rootfs on / type rootfs (rw)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
tmpfs on /storage type tmpfs (rw,seclabel,relatime,mode=050,gid=1028)  # this folder is empty actually (bad)
tmpfs on /mnt/secure type tmpfs (rw,seclabel,relatime,mode=700)
tmpfs on /mnt/fuse type tmpfs (rw,seclabel,relatime,mode=775,gid=1000)
</code>```

~ # cat /etc/recovery.fstab

```<code># Android fstab file.
#<src>                  <mnt_point>         <type>    <mnt_flags and options>
                            <fs_mgr_flags>
# The filesystem that contains the filesystem checker binary (typically /system) cannot
# specify MF_CHECK, and must come before any filesystems that do specify MF_CHECK
# data partition must be located at the bottom for supporting device encryption

/dev/block/mmcblk0p3     /efs                ext4      noatime,nosuid,nodev,journal_async_commit,errors=panic    wait
/dev/block/mmcblk0p13    /system             ext4      ro,noatime
                                 wait
/dev/block/mmcblk0p12    /cache              ext4      noatime,nosuid,nodev,journal_async_commit,errors=panic    wait,check
/dev/block/mmcblk0p14    /preload            ext4      noatime,nosuid,nodev,journal_async_commit                 wait
/dev/block/mmcblk0p16    /data               ext4      noatime,nosuid,nodev,discard,noauto_da_alloc,journal_async_commit,errors=panic    wait,check,encryptable=footer

/devices/platform/s3c-sdhci.2/mmc_host/mmc1     /storage/sdcard1    auto      defaults      voldmanaged=sdcard1:auto
/devices/platform/s5p-ehci                     /storage/usbdisk0   auto      defaults      voldmanaged=usbdisk0:auto

# recovery
/dev/block/mmcblk0p8            /boot                           emmc
defaults                recoveryonly
/dev/block/mmcblk0p9            /recovery                       emmc
defaults                recoveryonly
/dev/block/mmcblk0p10           /modem                          emmc
defaults                recoveryonly
</code>```

~ # cat /etc/fstab
  ~ # cat /etc/fstab

```<code>cat /etc/fstab
/dev/block/mmcblk0p12 /cache ext4 rw
/dev/block/mmcblk0p16 /data ext4 rw
/dev/block/mmcblk0p13 /system ext4 rw
</code>```

I attempted to make a backup via CWM to the external card, but it failed I think on the first/fourth step:

```<code>boot                 fstab.smdk4x12       sbin
cache                init                 sd-ext
data                 init.rc              sdcard
datadata             internal_sd          seapp_contexts
default.prop         lpm.rc               sepolicy
dev                  mnt                  storage
efs                  preload              sys
emmc                 proc                 system
etc                  property_contexts    tmp
external_sd          recovery             ueventd.goldfish.rc
file_contexts        res                  ueventd.rc
fstab.goldfish       root                 ueventd.smdk4x12.rc
</code>```0

Obviously the folder with the backup remains empty.

So to my questions:

Is there ANY way how can I recover data from the internal SD card and/or from the (mounted) /data folder? I don't care what happens to the device, I only care about the data.

Less important one. Is there any way how to recover the actual system to a working state even without recovering the data mentioned in 1.?

Edit: Any ideas?


问:
Change user name which I see in adb
```<code> ./adb shell pm list users
Users:
        UserInfo{0:*********:13} running
        UserInfo{999:XSpace:800010}

./adb shell dumpsys user
Users:
  UserInfo{0:*********:13} serialNo=0
    Created: <unknown>
    Last logged in: +39m10s436ms ago
  UserInfo{99:Airlock User:10000010} serialNo=1001
    Created: +386d6h17m29s394ms ago
    Last logged in: <unknown>
  UserInfo{999:XSpace:800010} serialNo=11
    Created: +540d9h24m8s349ms ago
    Last logged in: <unknown>
</code>```

I would never set such a user name I've hidden behind the star symbols.

I couldn't find where it can be set in settings.

It's not a Wi-Fi AP SSID, not a bluetooth name, not a Lock Screen owner name.

How could that be? Even if someone took my phone, unlocked it with password, how they could do that? I'm puzzled.

Phone is Xiaomi Redmi 4 Pro with MIUI 9.

Title: Change user name which I see in adb


问:
List of ROMs for HTC Flyer

Possible Duplicate:

  Where can I find stock or custom ROMs for my Android device?

I've just received an HTC Flyer which I intend on rooting and putting a custom ROM on.  Normally I would look at CyanogenMod, but it seems that there isn't a port for the Flyer, so I was wondering if there is any resource where I can see a list of ROMs available for a given device?

Title: List of ROMs for HTC Flyer


问:
Is Kingroot/Kinguser reliable for Android 4.3+?
I recently rooted an Android (Yuntab K107, Android 5.1), with Kinguser (KingRoot). So far, it has worked well (except for a hanging Busybox command), but I got this warning starting Titanium Backup:

Is Kinguser (KingRoot) reliable for Android 4.3+? The app (KingRoot( says it works fine for Android 5.1.1-, but Titanium Backup says it's only reliable on Android 4.2.2-.


问:
What are my options to recover data from my water damaged phone?
My phone(Wileyfox Spark+, rooted and on COS 13, TWRP recovery) fell into water, and i got it out a few seconds later. I immediately took out the battery, sd card, sim, and lid, and left them in the sun to dry for two days. The SD cars is still functioning perfectly, the battery seems to be completely dead though.

These are my observations:

With another battery from an Samsung S Advance, this is what happens when I try to turn on the phone:
Buzz, light gray screen for a few seconds, then the screen turns off and stays off

When connecting the phone to a PC:
Windows connect sound, a few secs, disconnect sound, screen turns gray, then black, then gray, connect sound, black screen, then the charge indicator turns red/yellow. Disconnect sound when removing the battery again.
Windows says it doesn't recognise the USB device.

I'm not sure what happens, the screen turns gray now and then, but with a wavy pattern flowing over it. I don't think it'll be able to display anything useful anymore. It doesn't seem to be stuck in a bootloop, but i can't see if i can get into recovery mode.

EDIT: The phone is working with the original battery now when keeping it plugged to power. Both windows and the phone make a sound acknowledging that they're connecting and disconnecting when I plug or unplug the usb cable. The phone also reacts when i'm pressing the power button by lighting and dimming the screen, still in gray. The device is showed as a phone/music plater in win explorer, but no folders or files show up upon opening it. I didn't have a lock code or pattern on the phone.

What are my options to retrieve data from the interal storage? Is there a possibility/programs to access and recover it?


问:
How do I sign in to google without compromising password?
I've got a Lenovo Solo VR headset. I've got a long, randomly generated password for my google account that is pretty much impossible to memorize without an eidetic memory. If you remove the goggles to look up the next few characters, the login process resets (this is pretty much the exact same problem on Android phones where switching apps to copy the password restarts the login process). It goes without saying that trying to type this in using the simple hand controller is a PITA (possible, but not fun). In order to use the Google Store, I changed my Google password to something far simpler (as simple as possible). Great, now I'm able to login, but when I change my password back to a long, complex, random password, Google Store kicks me out.

Other than creating a separate google account with a simple, easy-to-type password just for my VR goggles, is there any way to login to Google without a password? Or not have it log me out when I change my password?

If anybody from Google reads this, it would be great if Android or, at least, Daydream could just do what a bunch of other apps do and show me a short code in the headset, then I can visit a page on my computer where I log in as the account I want to activate and then type in the code.


问:
I have a Lenovo android pad with voice commands that will not display @ sign. When I say at sign it displays "at sign" only
How do I display the @ sign using voice command.</p>


问:
New to this sort of thing: Attempting to figure out a long lost Google account on Android
I am very new to this sort of thing and I am really liking the possibilities that are achievable with Android. I wasn't really at all familiar with this until a few days ago and some of the things that you guys are doing is really pretty neat!

Okay, so I want to get started by saying I have a pretty big problem, and that problem is going back around this time last year.

I had used my android device to download a couple of applications through the Google Play Store, and I cannot remember for the life of me what the account in question was. I have tried to wrack my brains to figure bits and bobs out but I am only really able to achieve the dates the applications were downloaded and their times. Not what account was associated with the said applications, If I could figure out the account not just the password, that would be half of the battle.

The tricky bit is that I know that I removed the account from my device at some point and attached a new one that I use on and off, but I am in need of getting back into the prior.

I have been looking at the forums up and down, trying to scour for answers, looking at posts about Databases and rooting etc and I even attempted rooting my device today, but of course as a Newbie, what I really do not want to do is erase any of the data from the applications, or any data at all really that is on the root level. I pretty much just quit after a bit but I am trying to get myself familiar with the basics of this.

Because it was such a while ago I have been really skeptical about how long it will have been stored in any said databases etc, whether is has been replaced etc, all in all I might find nothing, but at the end of the day I just want to get to the bottom of this mess so that I am able to hopefully try and retrieve a lost account.

I have been picking up a few things on using 'Odin' and using the 'Teamwin' tools, as I said I was about to root my device using 'Magisk' but I eventually sort of gave up as I was unsure on about backing up my data and not having enough space on my device.

So, what would I do from here, at this point I am just a sitting duck, I am sort of in bits at the moment and I am all over the place trying to figure things out.

My Specifications on what device I am using are as follows:

Device: Samsung S6 /
Android Version: 7.0 Nougat /
Build: G920FXXS5EQL5

Thank you for your time!


问:
Google Response Sound (Ding sound) on clicking google mic or saying Ok google
Why after turning off all the accessibility services the sound is disabled  and immediately after enabling accessibility of any third party app or inbuilt app ,this sound is enabled.
I (perhaps everyone , I tested 3 phones at my home ) am facing this issue since two year.
This is not an OS issue  as it occurred in Marshmallow, Noughat as well as in Oreo.

I have found only one solution on the internet reagarding this & it is "Turn on Accessibility fpe at least one app"


问:
Android SMS/MMS not getting deleted
I've tried many different things to delete my SMS/MMS messages but nothing has worked. Things I've tried so far

History Eraser https://play.google.com/store/apps/details?id=mobi.infolife.eraser&hl=en_US

tried deleting them manually one by one.

and I tried creating an Android app and getting the following line to execute

```<code>mContext.getContentResolver().delete(Uri.parse("content://sms/"), null, null);
</code>```

But no method was successful. Are there any other options worth a try? I don't want to do a factory reset or root my phone.

Title: Android SMS/MMS not getting deleted


问:
How can I make my phone synchronize data more reliably?
Problem

My phone, Sony Xperia Z5 Compact, doesn't like synchronizing my data.

Sometimes it takes hours for my email and chat notifications to go through, and if I take some photos, it is very reluctant in sending them to Google Photos even if my Wi-Fi is enabled with good reception and the battery is fully charged.

Additional data

I noticed that the problem generally disappears if I plug it into the charger, but I fail to find a setting that throttles Internet usage. The phone fails to sync even if it's fully charged and the wi-fi is on. Google Photos specifically will sometimes start syncing the very moment I open the app. The STAMINA and the Ultra STAMINA modes are off. The problem persists with all Wi-Fi networks I've tried, and when wi-fi is enabled during sleep.

The phone used to work normally, which makes me think either one of the software updates about a year ago caused this problem, or there's something wrong with the hardware.

Question

I'd like to know what I can do to make my phone sync more often and more reliably.


问:
Resetting phone to one big internal disk?
My phone has 32GB internal storage and 128GB external (SD-card). Internal has 20GB to use for data and apps, of which 19GB is used. TomTom Go uses 6GB of internal storage. I can't move it to external storage.

I've heard that with Android 8 you can merge internal and external storage, but it needs a complete reset of the phone, removing all apps, data and settings. I'm prepared to do this, but I can't find the proper manual how to do this.

I got this phone with Android 7, then upgraded to 8.0 and I heard that when you start out with 8 it is the default setting. So is resetting enough?

Now what happens when my SD-card crashes? It has happened before. The SD-card is gone of course, but what will happen to the phone? What happens when I eject the SD-card? Does Android keep the base system safe, so most important apps on the internal storage?


问:
android 8.1.0 - unable to reinstall apk
Pixel 2, Android 8.1.0

I have an .apk which has been signed by a developer on our team. The first time I install one of the builds, it installs fine. If I uninstall the app and try to reinstall it again from the .apk, this is what happens:

I have tried clearing the data/cache of the Package Installer app as has been suggested elsewhere on google, but it did not help.

Any tips/ideas?

I should note that I am not an android developer, and our android developer does not know what's causing this or how to fix it. He is also a remote dev, so I can't just have him come have a look. I am not able to physically connect my phone to my computer, as it is a USB-C phone and I don't have a USB-C => USB-A cable.

EDIT
As requested in the comments, I am uninstalling the app by long-tapping the appicon and dragging it to the top of the screen where it says "uninstall". I have also tried uninstalling it from the app settings to the same effect (Settings -> Apps & notifications ->  -> Uninstall)

Title: android 8.1.0 - unable to reinstall apk


问:
Disable headphone physically in rooted phone
I want to disable my headphone jack in my rooted Android phone because it is physically damaged. How can I do it? Is there any way in build prp file or any other way so that it is "physically" disabled it?</p>


问:
Clone phone with TWRP (Galaxy S4 mini)
I have two identical* phones (Samsung Galaxy S4 mini), both with TWRP installed. I want to clone one to the other so that all applications, data, settings etc are preserved.

How I did my backup:

First, I backed up all partitions except Cache to my SD card.

Then, I copied /data/media/0 to the SD card

I cloned the SD card to another SD card (both identical hardware) and inserted it into the other phone.

How I tried to restore it:

Sadly, TWRP didn't show my backup in the restore list

I then made a backup of the bad phone to generate folder name and replaced its content with the good backup (someone on Reddit suggested that)

Recovery showed that backup, but the list of partitions was empty

After this, the folder with the backup was not present on the SD card anymore

Is there a way to make TWRP accept backups from other devices? Are there other ways to create backups but not bound to a single device?

*With identical, I mean hardware-wise. They run different software: The one I want to clone runs vanilla Android, but I flashed its recovery with TWRP by booting into Download mode. On the other one, I additionally used TWRP to install LineageOS as I was told here.

Title: Clone phone with TWRP (Galaxy S4 mini)


问:
Open with %APP% Always option not remembering
I have a intranet webpage that has a button that launches a barcode scanner app, basically by calling the app through a link to the company's webiste:

```<code>Scan Sales Order
</code>```

When one clicks on this link a modal pops up with 'Open with Barcode Scanner' and the Just Once or Always buttons.

If I click 'Always' it never remembers. Anytime we click the button to scan, it always asks. How do I override this, or just force it to use the default app without prompting me?

Body:
I have a intranet webpage that has a button that launches a barcode scanner app, basically by calling the app through a link to the company's webiste:

```<code><a class="btn btn-lg btn-block btn-success" href="http://zxing.appspot.com/scan?ret=http%3A%2F%2Fwebin1%2Fembroidery_scheduling%2Fjobs%2Fmobile%2F%7BCODE%7D&SCAN_FORMATS=CODE_39">Scan Sales Order</a>
</code>```

When one clicks on this link a modal pops up with 'Open with Barcode Scanner' and the Just Once or Always buttons.

If I click 'Always' it never remembers. Anytime we click the button to scan, it always asks. How do I override this, or just force it to use the default app without prompting me?


问:
How to connect to PEAP MSCHAPv2 Wi-Fi using system certificates in Android 8.0 Oreo?
This is in followup to a similar question about Android 7.1
How to connect to PEAP MSCHAPv2 Wi-Fi using system certificates in Android 7.1 Nougat?

In there is said:
"Android 7.1 has introduced some changes to Wi-Fi connection interface. In 6.0, when selecting PEAP MSCHAPv2 in Wi-Fi connection interface, there were no CA certificates available (unless some had been installed). In 7.1 one can Use system sertificates and Domain input field appears."

But in 8.0 it seems its back to no certificates, just "Select CA certificate" and "none" and hitting "Select CA Certificate" does not do anything, and it doesnt let you continue with the setup.

Anyone know how to connect to a PEAP MSCHAPv2 Wi-Fi using a certificate in 8.0?
I've exported the cert from a windows machine connected to it and imported it as a user certificate for wifi, and still nothing happens when you click "Select CA certificate".

Thank you!


问:
How did my application database end up on the SD card?
I have a question regarding database location on Android devices.

We don't specify where to install the app(no installLocation in manifest), but we see that ./data/data/{package-name}/databases are ending up on SD cards. On the Android doc it said that "When your application is installed on external storage, the .apk file is saved on external, but all private user data, databases.... are saved on the internal device memory."

My question is:

If the app was first installed on internal and the user decided to move it, does the databases and other user data also get moved to external SD card?

If no, then is there any other possible scenario as to why the database is now in external?

Any help/insight is appreciated! Thanks in advance!


问:
LineageOS 14.1 browser keeps saying "Download Unsuccessful" at 30-35%
I recently installed LineageOS 14.1 x86 (Android 7.1.2), and have been having issues downloading with the default browser.

Every download starts working, but then fails at around ≈30-35%. I have:

Checked connection. All downloads were happening on a reliable 4/4 bar Wi-Fi connection.

Retried downloading. Same issue.

Tried a different file. Still, the same issue.

Downloaded an app from the Google Play Store (since it uses the Download Manager as well). It works just fine.

Used an app with a built-in download manager (Google Chrome). Successfully downloads the files I was having troubles with.

Is there some way I can make the built-in browser properly download files?


问:
PDF/Image viewer with scaling to a calibrated size
I'm looking for a way to consistently display raster images or PDFs, so that the image on screen has a calibrated physical size. I.e. I create an image/PDF on a computer with a shape 10cm*10cm and want it to be exactly this size on the tablet's screen. I don't care if I have to measure/calibrate something beforehand, or if the viewer on the device queries e.g. the screen size/ppi and image dpi to do this. I only need this to be accurate for one single device.
Any ideas on how to do this? </p>


问:
How to restart phone when power button does not work
When driving I saw a dialog that an application power control stopped. Later I realized that the phone Nokia 8 behaves strangely. I cannot go to launcher, switch application and reboot the phone. Back button works, two other buttons have no effect. Volume app and down work. I can use the power button to lock and unlock the screen. But holding it does not bring reboot options. Is there any other way how to reboot the phone?</p>


问:
Is there a way to disable fingerprint reader on OnePlus 5T?
I'm using a OnePlus 5T, which is running Android 8.1. Since the face-unlock works perfectly, I don't need the fingerprint reader much. In addition, I often touch the reader accidentally and the phone gets unlocked without my intention.

I only see the following settings related to fingerprint.

When I click a fingerprint, there are two options:

Rename fingerprint

Delete fingerprint

I couldn't find any option to disable the fingerprint reader. Actually I don't know what happens when all fingerprints are deleted, but I don't want to delete them.

Is it possible to disable the fingerprint reader without deleting fingerprints?

Edit: I use my fingerprint to sign in to some apps, thus I want to disable fingerprint-unlock only.


问:
Can I emulate my NFC credit/bankcard with my phone?
down vote
favorite
Samsung Pay, Google Pay, Apple Pay or anything else isn't enabled in my country, but I do know that my card is using NFC. From what I have read there is a possibility that it can't be simply copied, because it actually doesn't transmit the card number and only encrypts something it sends. But I also read that some older cards don't use this yet and can be copied.

How can I find out which is the case? And in case it's an older card, how can I copy it onto my phone?

I have an Samsung S7 with Oreo (international model), maybe that matters because it has Samsung pay capabilities? I can also root it in case that is needed.


问:
How to transfer files using WiFi Direct between 2 ICS devices?

Possible Duplicate:

  Is it possible to send a file wirelessly without bluetooth or a wifi network in ICS?

I recently asked the question whether it was possible to transfer 2 files between two ICS devices here.

This leads to the question:  How do I transfer files between two ICS-devices using WiFi Direct?  Is there a way to do it built-in to ICS, or is there an app for it?

UPDATE:

The Samsung Galaxy S II apparently has this feature built in pre-ICS (go samsung!). Is this same method available in ICS?


问:
Partial display failure
The lower 1.5 to 2 cm of the screen of my OnePlus 3 failed:

(The white part in the middle is just censored information. The problem only exists in the bottom.)

When I power my phone completely off,the part in the bottom is black and slowly turns green (but not uniformly green). There also is a colorful (now mostly white) line originating from the right side of the screen between the failed part of the screen and the part that works normally.

When I turn the display off, the failed part stays on a bit longer than the rest. When I turn it on again, it's green from the beginning if it has only been off for a few seconds. If it has been off for longer, it starts from being black. Probably just the same as if I turn it off completely because I waited before powering it up again.

Touch works normally anywhere on the screen. The buttons below the screen (return, home, app list) work normally too.

Is this a loose connection? Should I buy and install a new screen? How do I solve this problem?

I posted this on the OnePlus forum already (https://forums.oneplus.com/threads/partial-display-failure.882605/) and will answer this question myself if a solution is found there.

Title: Partial display failure


问:
How to restore backup from Google Drive
I've a Sony Xperia Z tablet (SGP311) that has a specific setting to enable online backups. It reads (translated from Spanish):

Back up application data, wifi passwords and other settings in Google servers

I wanted to do a factory reset to clean up storage so I enabled it and I waited several hours until the copy showed in Google Drive (my tablet lacks the "Backup up data now" mentioned in generic Google documentation).

After the factory reset, the wizard never offered to restore any copy. I added the Google account to the device but absolutely no data has been restored. There's no option anywhere to restore the copy. This is utterly different from my experience with an LG phone, where everything (and I mean everything) was restored automatically upon first star up.

I have two questions:

Did I misunderstand the purpose of Google backups in the context of Xperia?

Is there a way to restore the backup I have in Google Drive?

(Additionally, I copied into my desktop PC all files and folders that are possible to copy though USB and I made a backup with Xperia Companion.
 As last resource, I tried restoring the Companion backup—the program runs for a while and then closes unexpectedly... but I guess that's another question.)

Title: How to restore backup from Google Drive


问:
Show which photos are not backed up to Google yet
I was using Google Photos in my Samsung J7 + Android 6, and it overlaid a small symbol on each photo which was in my phone and not synced to G Photos yet (I had disabled auto backup, so I did it manually).

I switched phones to Samsung J7 Prime + Android 7, and now I cannot see that small symbol anymore.
So I do not know which photos are synced and which are not.

Can that be done under Android 7?


问:
Does the fastboot erase cache command wipe all your data off your phone?
As the title says. As i was trying to flash a new recovery to my phone, i followed a tutorial and that said i needed to do this command but now the OS isnt booting up anymore.
Did this command wipe all the data?

I'm using the phone: Oneplus 5t and used this tutorial

https://www.techrrival.com/flash-recovery-adb-fastboot/


问:
Using audio and mic from device used to answer phone
I have 2 bluetooth devices:

1. Wristband - which can also act as an earpiece

2. Bluetooth earphones with a mic.

My wristband is always connected via bluetooth to my device, and my ear phones are only connected when i use them.

When someone phones me, doesn't matter with what i answer, there is a single device which is selected as the audio/mic device.

I know I can set a specific device to act as the one used when taking calls.

But, I want the device i use to answer to be the one i click when the phone rings, i.e.:

1. If I click on the phone - the phone is used

2. If I click on my wristband, then that is used

3. If I click on .... you get the picture

I think this is a logical request.

Searched the web, failed to find a solution.


问:
Delivery List (DL) or Mailing List for Texts
I have a group of friends who like board games, and want me to text them any time we have a board game pick up night come up. But as friends move away or new friends are made I want to update this list.

At this point the list is a couple dozen people long and so manually texting that many people on short notice is hard. I'd like a 'few button clicks away' way of sending all of them a single, simple, text. IE "Board games tonight at my house at six!"

The Question

Is there a series of operations (on any app) that will let me keep a list of phone numbers that I can conveniently group text?

Complications

I will routinely add and remove numbers from this list. (basically a Delivery List)

I won't have access to other communications platforms for these people. (can't make them use an app or connect to their facebook or anything like that)

Other Notes

I'm willing to use pretty much any app if it does this (and isn't blatantly evil)


问:
Is SuperSU still downloadable anywhere or is the project dead?
I am trying to root an Asus Tinkerboard and I've come across some instructions that mention downloading the flashable zips from the SuperSu.com downloads page. However it seems all of these links on the page are dead now, possibly pointing to files hosted on AWS that no longer exist.

Does anyone know if there is a new place where these might be hosted so that I can download them? In researching a bit I've come to understand that chainfire parted ways with them early this year but seems to indicate that the project would live on in his absence. It's been several months now did it end up not really living on as anticipated? Has it just moved elsewhere? Is it just a temporary issue? I checked throughout the weekend and they've been dead links the whole time so I don't think it's temporary, but only been looking a few days.


问:
Is battery temperature reading, dependent on the ROM that is installed on the phone
On my original Android installation, the battery temperature was 31-37°C depending on what I was doing. Now I've installed a custom ROM and the temperature is usually 35-41°C.

This 4°C difference is something that I should feel with my hand, but I doubt there is that much difference.

Is it possible that two different ROMs are reading the same temperatures differently?

PS: Power consumption is not much different either


问:
Device won't boot - Shows g.co/ABH secutiry error
Device is a pretty much new LG V30 from verizon, running android 8.

I have done pretty much nothing with the device yet. No root, no tinkering, nothing. I accidentally accepted the software update request it showed me today, which I didn't want. I shut the device down but every time I would turn it on it would start the update progress.

The only other option I had was booting into recovery, so I did that. I was presented with the following options:

So I went with factory reset. After that the phone won't boot anymore, and all I see is this screen:

What can I do now? I could use warranty, but is there anything I can do myself right now?

Again: No root. No unlocked bootloader. Nothing. I used LG's "require password on boot" feature though, which I assume is equal to android's full disk encryption. (?)

Edit: Just talked to LG. Since my phone has [very minor] physical damage on its back, the warranty stands void per LG. What can I do now?

I can't even access fastboot. It just puts me into recovery. What am I doing wrong and what do I need to flash, assuming I can make it into fastboot?


问:
How to generate QR code that connects phone to wifi AND opens website?
I know it's pretty easy to generate a QR code that connects your phone to a wifi or open a website. But I can't find a way to do both with just one QR code. Is this possible? If yes, can someone tell me how or mention a tool that does this?

PS: I hope this is the right stack to post this.


问:
Certain apps not showing up in app list after upgrade to Pie
I have a pixel 1 and I upgraded to Android Pie yesterday. Now I have started to notice missing apps in the app list. They are still installed and appear in widget form on the main screen but do not show up in the app list.

They all appear finance related which is also interesting.

Is there a new AI "feature" that filters rarely used apps from the list or something? Can I turn it off?


问:
How do I update the browser of the Sony ebook reader PRS-T1?
I've an old PRS-T1 ebook reader that is still a very good reader. Occasionally I use the browser that is included, but this is very outdated (based on Android 2.2) and often gives errors about security certificates and other errors.
I've rooted this device so I think that it might be possible to manually update the browser for a smoother browsing experience.
Is there a way to update the system browser or install a similar browser (apk) that is e-ink screen friendly?</p>


问:
How to restore app data backups like logging in to a new device?
Basically, I have lost 60% of all my events in google calendar on both desktop and on android. I know there is a backup of the android app data from yesterday which should hopefully contain the events, how can I restore this backup from google drive?</p>


问:
android phone displays numbers info even for uknown ones to my adressbook
A question of a general nature, the call to the numbers of which is not in the phone book. android shows information such as a call name. where does this information come from, if the source is open and google take it from web, can this information be changed? </p>


问:
Running apps that require unrooted system?
I am trying to run Standard Chartered's app in android-x86, but I get the error:

```<code>This application is not supported on rooted
devices. Please restore or update your device.
(code: 4)
</code>```

Since I am running 8.1rc1 updating is not really possible, and since this is a brand new installation, restoring the device does not really make sense.

How can I either unroot the device or at least make the app think the device is unrooted?


问:
Meaning of: Delivered, Received, Tap to chat
Snapchat shows a kind of status under each contact's name in the chat list:

In the screenshot above it is "Tap to chat", but sometimes it is "Delivered" or "Received".

Question: What are all possible statuses, and what is the meaning of each?


问:
phone stuck in recovery and blank screen
so i have a condor plume L1 the the default rom was full of bloatware every 30 sec i get an add so i used adb to install twrp and wanted to install a custom rom but i had a problem with /data couldnt mount and stuck with that problems for days after that i decided to flash it and install the original rom using SP flash too everything looked fine but after its done andi unpluged the phone i got a blank screen when i press Power + vol up botton i get a menu

```<code>- recovery
- fastboot
- normal`
</code>```

and when i go to any option its just blank screen adb no longer recognize my phone but sp flash tool recognize my phone when i choose fastboot


问:
Block Probe Requests (SSID leak / active WiFi scan)
I have a simple question. I don't want my Android devices to do active WiFi scans because this way the SSIDs of all APs the device has ever connected to get leaked.

How can I block all probe requests? Could it be done using iptables?

(I don't care about the fact that auto connecting takes a few seconds longer if you only do passive scans. I don't care about closed-source apps like Pry Fi. I don't want to disable WiFi when I'm not using it. I don't want to use apps like Wi-Fi Privacy Police that alter the WiFi scans depending on your GPS location.)

OwnerDisplayName: Forivin


问:
Which option to choose in Redwolf TWRP Recovery for OTA update support?
I recently flashed the redwolf twrp recovery on my Xiaomi Redmi Note 4 (Snapdragon variant; code name - mido) which runs on MIUI10 (beta) based on Android 7.0 Nougat.

Now the reason behind the flashing is the fact that it supports the incremental OTA update.

But I have a problem in understanding which option I should choose to support the OTA updates. In fact, the redwolf twrp recovery I flashed is the latest build and there is no mention on the internet which option I should tick. Here is the image of the page:

Can anyone guide me?


问:
When will google assistant support Cantonese?
I heard that google assistant is going to support more language, there is no real date. Anyone know about when it will be released? </p>


问:
Why is Google Assistant so Slow?
I am using Google Assistant on LineageOS Android 7.1...

Using Assistant is like this:

"Ok Google"

1-5 second wait for beep

Speak command

5-10 second wait for Google Assistant app

2-5 second wait for analysis to show

5-15 second wait for application launch (such as TuneIn or Pandora)

Why is this so slow? I'm better off doing it by hand - which should not be. It should be like this:

"Ok Google"

beep

Speak command

Needed application launches

No waiting, no delays, "it just works."

To add to this - if the display goes to sleep Google Assistant doesnt respond at all, and all attempts to fix seem to assume that Android 7 = Android 7.0 (not 7.1).

I'm using LineageOS 14.1 (Android 7.1.2) June 29, 2018 on a Samsung S5.

Title: Why is Google Assistant so Slow?


问:
Data recover/transfer from a disk image
Situation. I have a .img disk image file obtained from a .vmdk file via a virtualbox conversion, the latter being created by an Android 4.4.2 emulator. I'm trying to recover some app data and transfer it to a new, working, .img file.

What I did. I extracted APKs and copied app data folders (com.devname.appname) from/to the /data/data directory. I did that using a file manager and via Ubuntu terminal. I also attempted to copy the folders to /Android/data. Although cp -ar retains files permissions and ownership, that was of no use after the import into the working image.

The problem (and a workaround). When the APKs are installed, a new uid (in the 10000 group) is generated for them. These values are unknown when I import the data folders, hence they are destroyed at phone boot. A log in /data/system/uiderrors.txt confirms this. The only way I could make it work was to install the APK, run the app so that the new data folders are created with a proper uid, replace those folders with old ones and fix ownership and permissions accordingly (for every app). This turned out to be effective, but it's a very tedious and error-prone process.

Is there a proper way to achieve this result?

Probably noteworthy:

Folders are copied after the APK is installed. The APK won't install if folders are there already.

Original image has some Android data corrupted, so it cannot be mounted in the emulator. loop mount works properly, though.

I didn't modify packages.list and packages.xml files (should I?).

Title: Data recover/transfer from a disk image


问:
Removing Encryption from Android Backup
I made a backup of my android using twrp recovery, at that time I had setup PIN as password in the device. After that, i installed some other custom OS, but later thought of switching to it, everything goes well, except it asks for password, and when i enter the same PIN I had setup before, it says incorrect password, is there any way to remove that PIN from the backup itself?? Or removing the PIN after restoring the backup? I don't want to lose my data as well. My mobile is MI A1. Any solutions to it??</p>

Title: Removing Encryption from Android Backup


问:
Query editing apk name
Will it effect working of app if I change name of apk using apk editor?
It's an VPN app and I want to change apk package name.
I'm not the owner of the apk and using apk editor app to modify the name.</p>

Title: Query editing apk name


问:
How can I share my wifi Internet connection from Android phone to a Linux Raspberry Pi?
How can I share my wifi Internet connection from an Android phone to a Linux Raspberry Pi?

I am trying to share my Wifi connection from the phone to a Raspberry Pi 3B. USB tethering is connected. I can access the RPi3 from the phone over SSH. But when I try to ping some website or browse I get the error message from Terminal:

Network is unreachable.

Any advice?

Vesa

OwnerDisplayName: Vesa


问:
How to stop my phone from annoying me with software updates?
I'm getting constant notifications that a new software-update is available for my phone.

It's a motorola on android 7 and i do not want the software-update. I was getting notifications all day getting to the point where it's so aggressive I'd rename my phone to an "updates pager".

I did the following:

```<code>1) Tap build number 7 times to enable developer mode
2) Settings -> Developer Options -> Disable Automatic System Updates
</code>```

And ever since the notifications per se stopped, but the phone still constantly (without the notification tho!) shows an activity (entire screen) telling me that there's a new software update.

Can someone help me to end my misery? The phone is not rooted. All stock.


问:
Show Android notifications until I explicitly close them
My smartphone is nice and reminds me of approaching appointments (Etar) or other stuff.

But sometimes I just do not look at the notifications and when I switch off the phone, the next time they are gone.

Is there any way to keep notifications showing until I explicitly close them?

OwnerDisplayName: Kurtibert


问:
Adb says "Error: Device offline" everytime
Please see this question for background information.

Problem:

Whenever I run adb devices it says Error: device offline - This appears even when no device is connected at all. It won't even let me start the adb server. Therefore solutions like "run adb kill-server first" won't have any affect.

Things to note:

This is adb on another android device. I can not "re-install the android SDK platform" or something like that. It took me a long while to find the ARM binary for adb that works.

From googling around, I suspect it might be that the adb binary is outdated, however it seemed to work recently for other people on XDA-devs. If anyone can provide me with a newer version of adb as a binary that will run on an ARM platform (android), I'd be happy to try it out.

Yes, I do run adb as superuser (root). Other commands (like adb --help work).

The tablet runs android 4. The phone runs android 7 but that shouldn't matter since even without anything connected I can't even start the adb server on the tablet.

Edit: Using the adb binary from here solved the error, but presents me with this now:

```<code># adb devices
List of devices attached
* daemon not running. starting it now at tcp:5038 *
* daemon started successfully *
** daemon still not running
error: cannot connect to daemon at tcp:5038: Success
</code>```


问:
Possible to use mods with locked bootloader? Xposed, Root, zip files Twrp
I want to unlock bootloader install twrp, flash xposed and magisk zip files through twrp. Flash the stock roms recovery again relock the bootloader to be able to use those mods.

Is this possible, i think it was as i've seen it suggested before however issue here is lots of phones delete data during the unlock relock, so that would remove all the mods relocking it defeats the point.

Also my current phone the Samsung S7 Edge, has factory reset protection. I have to unlock the bootloader to flash, tho if i lock the bootloader after flash. Reboot it is permantly stuck on a screen saying locked with factory reset protection in red.

Only way out of this is to go into download mode and flash stock through odin. So i'm guessing Samsungs factory reset protection, ontop of data be deleted even more impossible.

Samsung has dm-verity so magisk or a file to remove dm-verity has to be flashed or rom won't boot.

Maybe i can root without twrp and use flashify, i don't no if it can install xposed magisk.

Looking for suggestions of phones this could work with.

Thanks.


问:
Find Your Device doesn't lock/erase or indicate it will be completed when phone is online
I don't believe these exact questions have been answered, so would appreciate your help!

I lost my Samsung Galaxy S8 while it was on airplane mode. I have been checking Find Your Device frequently, but I have seen no change in the date it was synced (which is the day before I lost it), nor have I been able to locate it.

I tried locking it, but after inputting the information the screen gets stuck in “Trying to contact your phone…”.

I also clicked “Yes, erase” in the “Consider erasing your device” section. The words “Trying to contact your device to erase it…” showed up in the bottom left corner and disappeared within a few seconds. I was left with a screen saying that I could restart these steps at any time:

When I go to the Find Your Device homepage again, there is no record that I tried erasing the phone. The “Yes, erase” option is still there. I tried it multiple times from both of my Gmail accounts. How can I tell that the erase command was sent and will be completed as soon as the device is online? And how can I tell if it has been erased? I did not receive any emails about it.

I did sign out of my Google accounts remotely and change my passwords. Is that why it doesn’t work? I thought I would still be able to track the device after those actions, but I don’t know if I can still lock the phone or erase it. I don’t actually know if the signout and password changes worked, though, because the phone was on airplane mode when I lost it.

Any other advice would be great. Thanks!


问:
L2TP VPN connection on Android via shell
Is there a way to open a predefined vpn (inbuilt vpn managment) connection on Android 8< via shell (on a rooted device), so it can be put in an init script?

Thanks


问:
How to optimize all my apps in “Battery Optimization”?
I have xiaomi mi max 32gb -Multirom 8.4.26
I make all my apps "battery optimized" except these apps: (Greenify+amplify+powernap+Launcher+Appops+Magisk+ Xposed).

But after rebooting my mobile, apps returns non-optimized. So I need to make all my apps optimized after every reboot. This task is tiring and wastes my time.

My Question: Can you help me batch optimize all apps after every reboot, please? By using tasker or terminal commands or adb commands or mod or anything
Please help me


问:
Screen won't turn on during a call
As soon as I'm connected on a call, both outgoing and ingoing, the screen goes blank, even if it's sitting on a desk (i.e. it's not the result of the proximity sensor).

I can't get the screen to go back on until the call is ended.  Pressing the power button does nothing; pressing the power button and then the fingerprint sensor gives the phone a brief vibration, but does nothing for the screen.

I can still speak and hear during the call, I just can't interact with the screen in any way.

Once the call is over, I can get the screen back on via power button + fingerprint sensor.

My Settings has no option under Calls for turning the screen on or off.

(Google Pixel XL, Android 8.1.0)

Title: Screen won't turn on during a call


问:
How to add contacts on FireChat?
I just downloaded FireChat for my Android. I see it identify you with your email address by making you sign up, but I can't see anyway to add contact on FireChat. Does anyone know how I can add contact on FireChat?</p>

Title: How to add contacts on FireChat?


问:
How to greatly improve privacy against Google apps such as Play Services?
This is really a long and tiresome journey. So I hope you become my companion!

Device info changed with build.prop and XPrivacy/Lua. Magisk/Xposed in Systemless mode.

I am on my way to achieve finest and most stringent privacy settings possible on android for Google services (Package - Pico). OS is Lineage OS 14.1 - 7.1.2

I am looking to fine tune the privacy settings for Google right now. I have been able to get amazing control over it with the help of XPrivacy/Lua modules of Xposed, but here is the catch. I am not able to get Google Play Store to connect, which is obvious. So I want to know what are the bare minimum permission requirements for it to work while keeping privacy in check?

I have firewalled through AFWall+. Only have allowed Google Play Store and Play Services (Group of apps) to connect.

Steps taken:

Most rights are revoked with the help of Privacy Guard of OS.

System apps are also paralyzed with restrictions.

Most permissions are actually allowed in XPrivacy and Lua.

Critical permissions (Network/Serial/Tracking/Analytics/Location) are denied.

Frozen many Google Apps (and System) with Titanium Backup.

AFWall+ has allowed only limited apps: GApps/Download Manager

After all this, device is stable. No boot loop. No app crash.

Only root apps have true access here. No other app, be it system or user apps, have any easy access to device info.

I am fine tuning each permission as I go. But any input from you can help accelerate this process.

Will you be my north star?


问:
Why is IVPN so slow?
I use IVPN on my laptop, over Wi-Fi, with two proxies, each with just under 30ms delay. Web pages load snappily, and online gaming shows no perceptible drag.

Using it on my Android ‘phone (which probably has more processing power than my laptop), with only one of those proxies, over a 4G data link, leads to web pages taking a few seconds to load.

(How) can I improve this, as I would like to use IVPN for all traffic? Are there any settings that you can recommend? Does anyone else experience this delay?

Title: Why is IVPN so slow?


问:
WIndows Antivirus reports Arp Cache Poisoning Attack by Android device
A Windows computer running ESET reports Arp Cache Poisoning Attack by the IP of my android phone.
It's Redmi Note 4,
MIUI 9 Global Stable,
Android 7.0.
I scanned it with Avast, Malwarebytes, MIUI Security App, Google Play Protect. I didn't find any virus.
I scanned the ports with nmap. Nothing suspicious.
My question is what can cause it?</p>


问:
Offline Maps don't automatically update on Google Maps
TL;DR: Why don't offline maps download automatically via WiFi for me?

Long version: I have a Xiomi Redmi 4, with no data plan. I use wifi to download an offline map in Google Maps. I only have one map, and I use it extensively (daily). I also connect to a wifi network for a few minutes each day -- long enough to download all the other apps updates, etc.

According to this Google documentation, the offline map should update automatically:

Offline maps that you downloaded on your phone or tablet need to be updated at least every 30 days. When your offline maps expire in 15 days or less, Google Maps will try to update the area automatically when you're connected to Wi-Fi.

I've been using the same map for at least six months, and it never once updated automatically. Am I doing something wrong?

I read through some of this Google support thread, and it seems like it works for other people.


问:
Moto e2 doesn't recognise mobile network, what can I do?
My wife has recently switched mobile operator and now can't get mobile data. Phone calls and text are OK. WiFi is OK.

Going to Settings -> More -> Mobile Networks -> Network Operators shows a list of possible networks (The usual UK ones: EE, Vodafone etc) but not the one she's with. We've been through the APN settings and they are identical to the settings on my phone, which works.

If we turn the phone off and on again, or switch it into airplane mode and back again we get the following message:

You have lost data connectivity because you left your home network with data roaming turned off.

I have no idea what this message means.

The operator piggybacks on EE and the name at the top left says "EE - plusnet", but there is an "R" over the mobile signal strength indicator - which we've worked out means "roaming".

I'm also with Plusnet and if we swap sims hers works properly in my phone but mine still shows the "R". This make me think it's something wrong with the phone itself.

The phone is a Moto E2 on Android 6.0 Marshmallow. It had no problem with mobile data on the previous carrier (giff-gaff).

We haven't tried a factory reset of the phone yet.

Other than that, is there anything we can do to get the phone to recognise the correct network?


问:
Are Android USB plug-in chargers interchangeable?

Possible Duplicate:

  Is my phone liable to explode if I charge it with a charger that came with a different phone?

  Are Android chargers universal in terms of power (Voltage, amperage)?

I'm developing an app for my job for Android and we're testing on multiple devices.

I know I can charge the phones by plugging them in via USB cables and such but sometimes I may need to charge one or more via plugging them into the wall (or power strip).

Thing is, most of these phones come with a USB cable and a plug adapter to connect the USB cable to. Sometimes the plug adapter doesn't indicate which phone or manufacturer it came with and so it's really easy to get things confused.

What would be really nice is if I could just plug in all of these chargers to a power strip and just plug phones into any of the USB ports. Is this possible? Is it safe? Will I screw anything up if I just plug any phone into any charger?


问:
Other apps can't see PDF printed by Chrome
I'm using a Samsung Galaxy J3 with Android 7.  Here's what I did to print the PDF from Chrome:

Open Google Chrome app and go to a website I want to save

Go to : Menu, Share ..., Print.  (It defaults to Save as PDF and shows the preview.)

Click the yellow circle to Save PDF.  (It goes to "Save to", showing My Files > Internal Storage)

Click into the Download folder.

Click "DONE"

Just to be sure, repeat steps 1-4 and see that the file is now in the Download folder.  But now,

Open My Files app

Click "Downloads".  The file doesn't show up.  Same problem in other apps.

How can I open the printed PDF from other apps?


问:
LineageOS Linux Kernel version
I use LineageOS 14.1 on i9305 and have been pondering updating to 15.1 since it's decently mature now.

Recently I was looking into the Linux Kernel versions that Android uses.
Refer: https://en.wikipedia.org/wiki/Android_version_history

The questions I have are:

1) My ROM on my S3 shows Kernel version 3.0.101-lineage-gb7ffe7f. So is this actually Linux Kernal v3? Now shouldn't Android N run on Kernel 4.4.1 or is an older kernel version just expected on older phones for compatibility.

Thanks for clarifying.

Title: LineageOS Linux Kernel version


问:
Merge/Copy linked contacts
I hope this is the right place to ask my question.

On my android phone I have my contacts synchronized with NextCloud (CardDAV). Now, many contacts are linked/connected with other (same) contacts from social networks, providing more data. So far, so good.

As I would like to have a "unique exhaustive" contacts list that I also use on other devices (PC, online, or maybe another phone), I would like to merge/copy the additional data from the linked contacts into my existing contacts lists (which is then synchronized with my cloud/cardDAV).

So, the questions are: - is there any easy way to do this? - without giving my contacts to google or any other shady app? - preferrably with the option to chose on which data "wins" (like, own nextcloud contacts always win facebook data)

Thanks for any advice!

Title: Merge/Copy linked contacts


问:
Workaround with root for inability to set file timestamps
A bug or unfortunate design choice in Android since forever ago prevents non-root users from setting file timestamps to times other than the present.

Apparently this issue has been fixed and the fix is rumoured to have found its way into 8.0 Oreo.  However, I don't have that version of Android (yet).  Anyway, it sounds like it only works for certain apps.

For a different issue, that of write access to the external SD card, there is a workaround that allows this permission to be granted to individual apps provided the phone has been rooted.

Is there a way to allow an app to modify file timestamps on a rooted phone, perhaps by adding a permission to the appropriate section of packages.xml?  Having to copy files over as root is quite cumbersome and insecure.


问:
How do I get rid of boot screen on unrooted phone?
I have an old Samsung galaxy a5 2016 (sm-a510f). I had previously rooted it and installed a custom ROM called the Google Product Rom along which came a boot animation that flashed the google logo before actually going into the animation. Now I have decided to unroot the phone and flash the stock firmware, I have managed to do everything including getting rid of the boot animation. But when I boot up the phone it still flashes the Google logo before going on to play the Samsung boot animation. How do I get rid of it without having to re-root my phone? If there is no way and I have to root my phone again! How do I achieve this on a rooted device?</p>


问:
Chrome taking up lots of space on my Android device
I have an OnePlus 5T running Oxygen 5.1.4 (which is based on Android Oreo 8.1.6). According to the app DiskUsage, Google Chrome is using almost 15 GB of data.

(Click image to enlarge it)

Apart from this insane amount of space (which no app should ever use), I've been trying to figure out a way to backup the data (and remove the data I don't want). But I don't see a way of doing this without unlocking the bootloader and possibly flash the ROM.  I've enabled developer mode, I've tried backing up using the ADB drivers, but Chrome don't seem to let me backup it's app data.

Specifically asking to backup Chrome using adb backup -noapk -f Chrome.ab com.android.chrome only leaves a 1 kB .ab backup file.

But clearly the app data is there – and even DiskUsage can see it – and the device is not rooted.

So to summarize:

1. Is there a way for me to see the app data of installed apps, without having to root the device?

2. Is there a way to backup Chrome, only so that important stuff is backed up (open tabs, the state of each tab, history, saved passwords, browser settings, etc) and neglecting god knows what Chrome uses the space for. I'd imagine these would be stored in SQLite3-databases under /data/data/com.android.chrome/, but as I'm unable to access the files I cannot know for sure.


问:
How can I cast only my android screen to my tv
I have a Chromecast and I want to cast my android screen to my tv (mainly youtube) but not the audio, I looked online to find any answers and I found that I have to double broadcast I did it once (I assume) and could not replicate it I also cant google a guide to doing this because I just find other things that I am not looking for. So, how can I do this?

Thanks in advance!


问:
Upgrade the OS from 5.x to 6.x
How can I upgrade from 5.1.1 to 6.x in order to utilize adoptable storage?</p>

Title: Upgrade the OS from 5.x to 6.x


问:
How to update Flipkart Digiflip Pro XT911 to latest version of android
I have Flipkart Digiflip Pro XT911 Tab, which have old version of android like Marshmlow, Now I am looking for a way to update it to latest android version, How can I do that.

Thank you


问:
What is effecting my Android's sound?
Recently, while listening to music and YouTube the volume level fluctuates.

It goes from...

what I set it to - to 70% lower volume - to back to what I set it to - to 70% lower, on and on and on.

Headphones and Bluetooth both experience the same volume level up/down effect.

I booted in Safe Mode.  I deleted the last recently added apps I installed over the past 6 months. I have no tasker type apps installed.  I use the phone for calls, web and YouTube.

Nothing has fixed this.

The only thing I can think of is the last update I said "OK" too.

What else can I try?

```<code>Moto G5 Plus
Android Version/7.0
Android security patch level/1 June 2018
Kernel/3.18.31-perf-gf055b2e-00107-gdc6d2c1
</code>```

Title: What is effecting my Android's sound?


问:
How to prevent merging phone's contacts and Gmail contacts on Pixel 2?
I've been using Android for 7+ years and now got a Google phone. There are several things I like but one thing which annoys me a lot is that all of my phone's contacts are now merged with Gmail contacts.

For my phone contacts, I have prefixes (Dr, Uncle, Aunt etc.) and groups. Both are now messed up. All contacts are sorted alphabetically.

From my Gmail, all people I've ever sent or received emails from, are shown in the phone contacts. I tried to show only phone contacts by deselecting other but it does not work.

How can I only display contacts from my phone's address book with groups and ignoring prefixes/suffixes in sorting order?


问:
Find Exact Install Date of A FREE App From The PlayStore On A Older Phone
I'm looking to find the instillation date of an app I had on my old phone.
I've tried looking on the play store  here  however it only shows be previous paid purchases.

I've also tried using a android emulator on my pc to view Google Play Games achievements, as it appeared it used to show you the time those achievements are unlocked, however checking it now just shows the achievements and not the times.

EDIT: To clarify the app is no longer installed, hence all answers in the other question are worthless as this is not the same question, as these only answer the question to when the app was installed on the current device, not when they were installed on another phone but are still linked to the account.


问:
Finding hidden data
I have an app that has 4 GB of video data, But I cant find it even with the hidden files showing. I want to move them to my SD card, How do I find them ?                  </p>

Title: Finding hidden data


问:
How do I get calendar alerts to display before the event begins?
I use Google Calendar a lot for work. On my PC I get alerts appearing 10 mins before an event starts, which is great.

However, on my Galaxy S7 running Android 7.0, the alerts I get appear anywhere between 15 mins to an hour after the event has started.

Of course I've checked time zones and daylight saving settings both on the phone and the Calendar app (and on the Google Account too), and all is good there.

Would anyone know what I could do to fix this?


问:
How can I prevent bogus one-letter empty contacts from appearing in a dual sim phone?
I have a dual SIM phone and my address books keeps getting populated by these empty bogus one-letter contacts that are shown as being read from the second SIM, see picture:[
If I delete them, after some time, they appear again. I had some saved contacts (like 112 aka European 911) from my primary SIM that also appeared in this fashion but after I deleted them from the first SIM, they stopped appearing. However, I cannot deleted those from the second SIM card, because they are not there! I have this confirmed by another user of hte same phone (Gemini PDA) and also by someone who used to own a dual SIM Sony Experia, so it seems like a bug in Android. Any idea what to do about it?


问:
Titanium Backup installation error
I was using Titanium Backup previously. It was working fine when I rooted my device before a month. But Because of some problem in my phone I again rooted my device, and now when I install this app, I'm getting error 504.

I tried so many things:
I tried with different internet connection with high speed.
I cleared Google play cache/ services cache clear data etc.
I reset app preferences.
I downloaded apk from apkmiror.
I tried with signed testing APK.
I tried with the edit common files like change app name.

Title: Titanium Backup installation error


问:
Android phone lost, Data wipe after password change
Here's an urgent situation regarding phone robbery:

My android phone (note 8) gets robbed and as far as i know it has not lost its way to some general person. It was robbed by force, so people handling that can misuse it, so am very concerned.

It all happened in a very unexpected fashion and very fast. In a hurry to secure device, i immediately login to my nearest computer when possible (after 15-20 mins), googled how to clean the lost device and followed the steps. From the very moment it showed these two options:

a. ) Play Sound

b.) Enable secure and erase

I repeatedly click on enable 'secure and erase', google showed an alert that a request to secure and release has been sent.  But i guess robbers would have switched the phone off, so google might not have been able to delete it immediately.

I read that as a first step, i must change my account password. So immediately i changed my account password from the phone.

Meanwhile, i kept trying for secure and erase and searching for other safe options. On searching for how would i confirm if the device have been wiped, i came to find that after 'secure and erase' google supposedly sends an email to ask for further multiple options.

Now here's my concern:

Having already changed the password, when those robbers do turn the phone on, will google would be able to still secure and erase the phone? Or have i hurt my own cause after changing the password immediately.

The emails contain lots of personal information as i have been a heavy user of email on phone and of professional email as well. Also the phone's gallery contains more than 2k photographs of family members and close friends. Am really concerned about this. I know similar question have been asked before but the answers to that arent very clear. So I'll be really greatful if on or more of you can share any further information on this.


问:
How to free up space to install apps?
After installing a 32 GB SD card, having trouble installing apps.  Because the OS is 5.x and not upgradable then adoptable storage isn't an option.

How can I install apps when the system reports insufficient free space?  Every app I've downloaded has been moved to SD card, yet, the prompt is to uninstall these apps.  To reiterate, every app which I'm being prompted to uninstall has already been moved to external storage.

Seems a conundrum.

After resetting to factory default I then installed Disk Analysis for defrag on the system storage.

Title: How to free up space to install apps?


问:
PDF Print Preview Failure on Android 7
An Android phone with Android 7, trying to use the HP Print Service Plugin (Android 8 was the version that brought in the default print service that makes this obsolete).

Certain PDF files (all from the same sender, it appears) will not render correctly in the print preview dialog (and will not print, either). Instead of lines of text, you only see horizontal grey blocks where text should be. This is similar to how the Facebook website behaves while it's downloading content - showing a placeholder of sorts.

The same PDFs on my Samsung S7 and another random unbranded Android 8 tablet work fine.

Is there anything I might be able to do, or at least an explanation I can give for the issue?

Many thanks in advance.

OwnerDisplayName: Neil Barnwell

Title: PDF Print Preview Failure on Android 7


问:
Default Outlook sound notification
I have changed the new mail notification in the Outlook app to an Android - but now I'd like to change it back. In the list of Sounds the default Outlook sound isn't listed - where is it hidden?!</p>

Title: Default Outlook sound notification


问:
Check latest added apps in google play store
How do we check latest added apps in google play store? Currently we can only see New Free Releases but that are top new Free apps.

So How to Check latest added apps in google play store?


问:
Camera: Not working or all pictures gray
I'm having some serious troubles with my android camera application.

Either it directly tells me that it's not working ("Camera failed" in WhatsApp), or it allows me to take a picture - but that picture is just a full gray image with some stains on it (looks a little like this https://static.vecteezy.com/system/resources/previews/000/119/257/large_2x/gray-paper-texture-background-vector.jpg  for instance). However, through the "viewfinder" everything looks perfect - so the camera hardware itself should be fine.

My guess:
The SD card is damaged. I can't download any pictures from my web browser or send / receive images via WhatsApp (or any other app).
But, I CAN access the files on the SD card, so there is also some evidence against a corrupted SD card.

Details:
Phone: Lenovo K6
OS: Android 6.0


问:
How to make Gmail stop replacing the word "Re:" with a translation?
I have a friend who has a Sony Xperia X F5121 with Gmail v8.7.15.206199545 on Android 8. Every time he replies to a message in his Gmail app, the app replaces the word "Re:" with "השב:", which is the Hebrew translation for "Re".

When he replies from the Desktop Gmail, then it replies with "Re:", so it only affects him when he uses his phone to reply.

The official support suggests changing a language setting but his Gmail's settings simply have no language settings. The phone in general is set up to use Hebrew, and he doesn't want to change that. Is there a way to keep it as "Re:" or - if necessary - change only the Gmail app into English without affecting the overall phone?


问:
Question about restricted user profiles on 4.4.3 KitKat tablet
I realize that 4.4.3 is a very old version at this point so let me explain my situation for context. I work as IT in a small trucking company, we are a client of another company called PeopleNet who provides us with units to track our trucks, take driver logs, provide GPS, etc. Recently we purchased some of their MS5 PeopleNet Connected Android tablet units from them, along with their application we also wanted drivers to use certain applications that railyards are beginning to regularly use for in-gating and out-gating loads. Obviously though, we don't want them to have access to much beyond those.

PeopleNet wants us to send the tablets back for a 3 week period and pay 12$ a month to do this for us on a tablet system that was already 900$, which is ridiculous. Setting up a restricted user profile has pretty much provided everything minus one exception, the PeopleNet application (called PMobile) is not listed at under the applications for the restricted user at all.

I was wondering if someone with much more knowledge of Android could tell me, is this application not showing because I know at version 4.4.3 that restricted user profiles were a fairly new feature (It is also impossible for me to update the tablet past this version.)? This application was also NOT installed through the Play Store, but through a USB stick, could that be the issue? The application also has a plethora of permissions it requires, does this make it unusable in a restricted user profile at all?

If anyone could help me understand or even get the app to show so I can turn it on/off for the restricted user profile I'd greatly appreciate it. Thank you.


问:
How to enable USB Debugging from recovery mode?
My phone screen broke. I can't see anything, and the touch screen doesn't work. I can't buy a new phone, so I'm not looking into backing up my data, I want to be able to use it from my pc.
I have a Motorola Moto G2 running LineageOS 14.1, and TWRP custom recovery.

Until now I have been able to use my phone with from my PC using Vysor, because I previously had USB debugging activated. However, I accidently deactivated it and now I'm stuck out.

I can access via ADB through recovery and already have investigated how to activate USB debugging again from the shell using these sources:

How to enable USB Debugging in Android if forgotten pattern for screen-unlock?

Can I enable USB debugging using adb?

Broken screen while debug mode was disabled. How can I re-enable adb?

Enable USB debugging through Clockworkmod with adb

How can I enable adbd during boot on Cyanogenmod?

Manually enable adb debugging from recovery

How to authorize adb service from boot

But none of these solutions have worked for me.

Here's a brief summary of everything I've tried:

I've set the content of /data/property/persist.sys.usb.config to mtp,adb

I've edited /data/system/users/0/settings_global.xml, setting adb_enabled, verifier_verify_adb_installs and development_settings_enabled to 1

I've added these lines to /system/build.prop:

persist.service.adb.enable=1
persist.service.debuggable=1
persist.sys.usb.config=mtp,adb

I've used the following setprop commands:

setprop persist.service.adb.enable 1
setprop persist.service.debuggable 1
setprop persist.sys.usb.config mtp,adb

But when I reboot, I still can't see my device when I run adb devices

Not only that, but then everytime I reboot to TWRP recovery again, I notice that some changes are reversed:

/data/property/persist.sys.usb.config content only says adb

/data/system/users/0/settings_global.xml remains almost intact but adb_enabled is back to 0 again

When I run getprop to all of the properties I've setted before using setprop, it returns an empty string (which makes me suspect that the changes I've been making to /system/build.prop are being completely ignored)

It's as if everytime the phone boots, the system loads some default configuration and reverses some of the changes I've made and USB debugging remains deactivated. Am I missing something? I really not know what else to do.


问:
How can I join a Hangouts call with Hangouts Meet?
(The links provided by the Hangouts program do not work in Hangouts Meet - it appears I cannot enter the final character in the link, in either case it says "No such meeting.".)

Alternatively the answer to a different question could solve my issue.

OwnerDisplayName: nsandersen


问:
How to turn WiFi off/on when in/out a car?
My phone WiFi connects automatically to hotspots (of my cable provider) which is very convenient except when I'm driving (where connections are disrupted all the time). Is there an easy way to configure WiFi to be OFF while driving and then back ON when out of the car (e.g. depend on car Bluetooth connection)? </p>

<p>I tried the Automate app, and it seems to work fine, but it's tricky to configure and it triggers the battery usage system notification (Android 8) all the time. </p>


问:
I connected my Google Pixel to my PC using a USB A to USB C cable claiming to support data transfer, but it doesn't show up in Device Manager
I'm running Windows 10 and Android 9. I can't see the phone in Windows, so I can't transfer files or install apps I'm developing; I'm quite disappointed!</p>


问:
How to add a new button to the button bar in Total Commander for Android?
I got Total Commander on my Android phone.

I need to check the directory size for a folder and the solution is:

Add a new button to the button bar, and then..

I understand that but my question is how to add a new button to the button bar?

OwnerDisplayName: BearCode


问:
My android phone cannot recognize my camera
How come my android phone cannot open my camera?

I do have the system app on my phone, but I find it in the Apps portion and no matter what kind of camera app or camera repair app, it will not work. One app asked if the camera was in use.

I cannot press the lock button with the volume down because my volume down button is stuck and broken. I tried downloaded the camera repair apps like Camera (CMMFix) for Cyanogenmod and it doesn't work. My phone was just fresh from factory reset.

Also I get random crashes like camera and imageview has stopped working randomly.


问:
My phone is stuck in a loop
My phone is a Samsung Galaxy Young GT S6312.
It does not boot up at all. I have made a video of the loop as shown here - https://drive.google.com/file/d/1t38NYXvawmxSiIK9gqRTLINoIvG158Vi6w/view?usp=drivesdk

What is the problem?

I flashed the stock rom many times but it doesn't fix. Any help is appreciated.

Title: My phone is stuck in a loop


问:
Touch screen only works when charging
My Xiaomi Redmi 3s's old screen was broken so I imported a new LCD+Touch-screen with frame from china. After fixing the new LCD, the touch screen(LCD is working perfectly) is not working but the surprising thing is the touch screen of the new LCD is working only when the phone is connected to a charger! When I unplug the charger the touch screen stops working.
any Idea why its happening? hope someone could help me.

Title: Touch screen only works when charging


问:
How to fix USB Mass Storage not recognized by PC?
I have tried many things but can't make my Samsung Galaxy mini 2 S6500 USB Mass Storage to be simply recognized by my PC. Why is such a simple thing so hard?

Does anyone know the solution to this problem?

Thank you.


问:
Google Nexus 7 (2013 Wi-Fi) Boot freeze, no recovery options working
I bought a Google Nexus 7 2013 edition, Wi-Fi only, from a yard sale. I have no clue what the previous owner did or tried but I cannot get it to boot. I'm not by any means an Android expert so if it seems I'm missing something basic, it's quite possible.

Basic Symptoms and Problems:

-Power on -> stuck at "Google" logo screen

-Recovery mode -> the Android guy on his back with the red "!"

-Cannot wipe data/factory reset or clear cache partition as both result in a  bunch of mount failures (e.g. "Failed to mount /cache (Invalid argument)

-Cannot unlock (freezes on "erasing user data" for indefinite time)

-Cannot use adb to send OTA as it sends the package but can't mount partitions and results in "Installation aborted"

What I CAN do:

-use adb and can see the device

-use fastboot and see the device

I have PC drivers installed. Running Windows 10 on my PC. I don't care about the data or anything. I just wanted to wipe and factory restore this device. It physically looks to be in great condition if relevant.

I'm not sure what my next step should be or if I'm working towards the right direction. Pretty much every solution I've check either gives me errors or every thread is abandoned without solution.


问:
How to stop Vlingo Voice Talk coming up on double-tapping?
Maybe my home button is getting a bit bouncy but I'm getting this annoying app constantly coming up, blasting out "What would you like do". O/S 2.3.5.

Is there a way of reconfiguring double-tap or disabling this app without going a custom ROM?


问:
Delete inbuilt apps completely after rooting
I have a Samsung Galaxy on7, running on Android 6.0.1.

It has a lot of pre installed apps that I consider bloatware. I want to remove them completely from the phone.

Recently, I tried removing these apps as per this video:

Video 1

But soon I found that it does not delete the system files, because that is not possible without root.

I also found that I can root my phone using adb. The procedure (on a different phone, though) is here:

Video 2

After rooting and installing magisk, I want to delete the system files from adb using the following command (say, to remove google photos):

```<code>adb shell rm -f /system/app/Photos/Photos.apk
</code>```

and

```<code>adb shell rm -f /data/user/0/com.Google.android.apps.photos
</code>```

Two questions on this:

Is this possible to be done on my device? Any precautions?

Is there any way to backup the system files before deleting it?


问:
Updating system app without root and apk install in stock ROM
I need to update system apps like phone, contacts etc without installing apk or rooting. Is this possible?

Stock ROM in Moto X4

How can I update my phone, contact etc with latest version from moto? Is this only possible by OTA? I have seen in xiaomi devices which provide updates to system apps without OTA.


问:
How can I troubleshoot a very slow initial connection when web browsing on WiFi?
This has been bugging me for quite some time.

When connected to my home WiFi, web connections take a long time to initially establish (like ~10 seconds+) on two separate Android phones (OnePlus 3, and HTC 10). Once the connection is made, the download rates are absolutely fine. Also, web browsing is absolutely fine (almost no latency) on all other devices connected to the home WiFi - MacBook, PC (Windows and Linux). This issue is not observed on other WiFi networks, or when using mobile data.

I imagine it may be something to do with DNS resolution, firewall, or something else funny on my home router, but the main problem is I have no idea how to actually debug/troubleshoot this on an Android phone.

So by way of an answer, I would really appreciate either:

Suggestions of tools for debugging something like this - something like the Developer Console in Chrome would be ideal

Suggestions on what the underlying problem might be

Thanks alot


问:
Why does not full mean full?
I have a Razer Phone running 8.1.0.
When I go to the camera app, it says Device Storage Full

But my device is not full. I have 2.34 GB free (of 64GB) in system memory (I do not have an SD card installed). Shouldn't that be enough to take a few hundred pictures?

Title: Why does not full mean full?


问:
CPU throttling during Web browsing for battery preservation - counterproductive?
The power saving feature in Android (I'm mainly familiar with Samsung phones so this might not apply to all brands) throttles the CPU in order to save battery. If the phone is being used for Web browsing, this results in slower page loading, which means that your screen is also consuming power for longer when in power saver. Does this mean in some cases the throttled CPU might actually result in higher battery consumption (specially taking into account that modern CPUs are pretty good at regulating their own power consumption)?

I'm sure the answer depends on a lot of variables so let's assume some specifics (although it would be great if one could make some extrapolations to more general scenarios):

Samsung Galaxy J5 2016 phone (Quad-core 1.2 GHz Cortex-A53 CPU, 720x1280 Super AMOLED screen)

Google Chrome browser

Screen brightness is the same for power saver and non power saver scenario


问:
Has 2FA authenticator latency increased since upgrade to Android 9?
Since upgrading to Android 9/Pie, coworkers and I have noticed increased latency in receiving pushes to our authenticator apps (Okta, Salesforce Authenticator are my only two examples; haven't been using Google Authenticator). What used to be a wait of 1-5 seconds is typically a 10-20 second wait. Is this a known issue?  Before going to the app vendors, is there anything to explore in Android settings?</p>


问:
What is LgeGnssLocationProvider and how do I stop it from keeping my phone awake all the time?
After I have upgraded my LG G6 to 8.0 I've had this extremely annoying (partial) wakelock that keeps my phone awake all the time. It's LgeGnssLocationProvider according to BBS and is caused by the system. After some research I found out that GNSS stands for Glonass. When I turn of GPS completely this wakelock does not occur. The weird thing is that when GPS is on the wakelock does not happen always, but regularly. I used battery historian to figure out if something specific triggers it but I can't say for sure.

I have been struggling with it for quite some time. I rooted my phone to disable anything that had to do with GNSS but nothing worked. Over at XDA there are no answers either. I'm kind of running out of options. Any ideas on how to at least figure out what is causing this wakelock? Perhaps some way to trigger a notification as soon as the wakelock is detected?


问:
Can a Whatsapp account be spoofed?
I've had a big privacy concern lately regarding the safety of my Whatsapp account. Ever since my phone was stolen from me and returned by certain malicious individuals, I've had the weirdest feeling that they secretly "spy" on my Whatsapp messages. I've been told I've left "seen" on my friends' messages at times when I was almost certain I didn't use the phone. Other times I've had the weirdest feeling that they "know" the content of my messages, as they would nonchalantly just say something I texted recently they couldn't have known without, well, snooping on my messages. But as paranoid and insecure as I am, I cannot quite tell if it's just my overly active imagination playing on me, or if it's actually possible that my Whatsapp account's been hacked. I've attempted to solve this myself and I didn't have any luck since half of the information on the internet regarding this is either strongly claiming this is possible while the other one claims this is NOT possible, both with little or no evidence or explanation to suggest the either one. So, I understand how Whatsapp works:

1.) Your number is tied to your public key stored in the database

2.) Your public key is generated on your phone when you verify the account by OTP

3.) When you change your device, a new OTP is sent to your number and a new public key is generated. This public key is now valid, while the old one is no longer. Your account is not active on your old phone. (Because Whatsapp doesn't support more than one device per account at the time, except for Whatsapp web.)

Now, my main concern is, since the private key is generated locally (i.e. on your smartphone), is it possible to fool the app into generating the SAME public key as on your old phone, essentially fooling the database into thinking that only one device is connected to your account?

Internet claims this can be apparantly done by spoofing the MAC address and obtaining the confirmation code sent to the phone associated with the account that's being "hacked". Next step is to delete the confirmation code SMS off the phone to remove any proof.

Reasons why I think it's not possible:

1.) It would be a safety hole, actually you can easily figure out a MAC of a device if it's on your local network without even looking into the phone settings -> about. Your password would essentially be only as strong as your grip and any screen lock you have on (I've had none)

2.) It is possible that two devices by accident have the same MAC address

3.) I don't think Whatsapp would just so easily let people bypass their security features.

Reasons why I think it could be:

1.) A part of the internet says so

2.) My experiences (but keep in mind I tend to be a bit paranoid over security issues)

Title: Can a Whatsapp account be spoofed?