15
votes
Accepted
How to get Android 11 to trust a user root CA without a private key?
This page pointed me to the right direction.
Android 11 can only install user-provided root CA certificates to contain the X.509v3 CA:true flag, which I suspect wasn't necessary before for some reason,...
- 457
10
votes
Is Android a 32-bit or 64-bit OS?
Originally, Android was written for 32-bit processors only: and specifically, 32-bit ARM processors. Later, Intel and MIPS invested a lot into making Android support their architectures too: but still ...
- 35k
10
votes
how to mount /system as read/write in android?
Solution is simple. To remount a mounted system you need to have root privileges. Do an su. You will enter root mode. Then run the below command. It will work, I did it many a times.
So here are the ...
- 361
9
votes
Where does Android store fingerprint data?
try removing these files also
/data/system/users/0/fpdata/user.db
/data/system/users/0/settings_fingerprint.xml
Instead of removing files, appending the filenames with some random extension would be ...
- 91
9
votes
System partition locked to read only in Android 10
Android 10 prevents apps or pretty much anything from mounting system as R/W. Yes, even if you are rooted.
Top John Wu, the creator of Magisk has covered this in a series of tweets. I will link them ...
- 2,417
8
votes
Accepted
What is the official name of the "open apps" view that is navigated to by hitting the square system button?
It's called Recents Screen:
The Recents screen (also referred to as the Overview screen, recent task list, or recent apps) is a system-level UI that lists recently accessed activities and tasks.
- 7,174
7
votes
Accepted
Where are UID for each application stored?
You have already missed the correct answer.
The UIDs are stored right in /data/system/packages.xml, although an easier-to-interpret version with less information is available at packages.list.
Here's ...
- 7,747
7
votes
Accepted
What process happens when there is a system optimization?
What is Android doing when it says “optimizing apps/system”?
Basically the android system will be creating an optimised version of each application. This process makes each app start as fast as ...
- 10.1k
6
votes
Accepted
What does the /data/system folder store and its significance?
data/system folder contains system configuration files critical to maintaining device's state. Access to the directory is restricted by the system apps only, so if the device is not rooted the folder ...
- 178
6
votes
Accepted
Android: how to increase system partition and decrease data partition?
I have followed this method: shrink data and recreate system partition; which is not too "kind" but works.
Warning: this method is ok for a fresh installation from scratch. You will lose all ...
- 321
6
votes
Getting "java.lang.SecurityException: Shell does not have permission to access user 150" when uninstalling apps from Samsung Secure folder using ADB
Uninstall the Samsung Secure Folder from the Settings.
Settings -> Lock screen and security -> Secure Folder -> Enter your lock details -> Uninstall.
Refer to this blog.
- 71
5
votes
How to move SMS from hangouts to messenger app
Devin, I am not extremely familiar with stock Android, so I apologize if some of what I try to describe does not work exactly as I try to explain it.
The SMS messages on your phone is maintained in a ...
- 66
5
votes
Where is the Home folder?
If you're trying to access the files you see in your device when you're plugging it in a computer, then it's there :
/storage/emulated/0/
/sdcard/
- 300
5
votes
How to mount /system rewritable or read-only? (RW/RO)
-writable-system for the emulator
When launching the emulator after a build with, you must use:
. build/envsetup.sh
lunch aosp_x86_64-eng
emulator -show-kernel -verbose -writable-system
Then, for ...
5
votes
Accepted
Can IMEI number of a device really be changed
IMEI is an baseband identifier so it's stored on non-writable memory. There are two IMEIs actually - display and hardware. It's possible to change the display IMEI on rooted devices, but no way to ...
- 191
5
votes
Accepted
It's there a way to get /system partition permanent read/write access even after reboot?
You don't need to make /system permanently R/W. You just need to mount it as R/W at every boot. So I'm providing you with a few options to mount /system as R/W at boot automatically, but do note that ...
- 7,747
4
votes
4
votes
Is it possible to write to a device's clipboard using ADB?
Here's an improved version of the script by galets above. As with that
script, it does not write to the clipboard, but sends input to the
currently focused input field, which is often what you want ...
4
votes
Symbolic links in the Android filesystem?
You were dealing with /storage/emulated/0/Videos
Android like to make use of the /dev/fuse partition. I do not think you can make a symbolic link in this filesystem. On my htc desire 510, I see ...
- 41
4
votes
Accepted
Why do some apps not have to ask for the "Draw over other apps" permission?
Based on an answer by Mattia Maestrini on Stack Overflow,
It is a new behaviour introduced in Marshmallow 6.0.1.
Every app that requests the SYSTEM_ALERT_WINDOW permission and that is installed ...
4
votes
How can /proc/sys values be changed at boot (sysctl.conf does this on normal Linuxes)?
Use init's write command in /init.rc or any other .rc file. You may also create your own:
# /system/etc/init/custom.rc
on property:sys.boot_completed=1
write /proc/sys/kernel/hostname MyDroid
...
- 20.4k
4
votes
Accepted
Is it possible to create an operating system other than Android for Android devices?
Something like a secondary bootloader. Is that possible?
Yes it's possible. As you mentioned, since the boot chain up to bootloader stage is closed source and binaries are signed with OEM's private ...
- 20.4k
3
votes
how to mount /system as read/write in android?
see this related articles here and stack exchange answer here
Basically
You need root
Better to have adb secure apk installed
Check how the /system partition is mounted as read-only (ro), In ...
- 59
3
votes
What are the differences between a system app and user app?
I would like to add something in the above answers. System apps cannot be deleted in a full factory reset, unlike user apps. So if you want to delete all your personal files but they are too many to ...
- 31
3
votes
Is it possible to write to a device's clipboard using ADB?
I have tried and googled a bit and it seems the call-service-clipboard-approach stopped working in newer androids, it failed for me on a 4.4.4 version Android. I.e. you will need an app to get ...
- 31
3
votes
Accepted
Wiped System Partition... No OS.. How can I recover it back?
Download the following file (J730GMTCE2AQJ1_TCE) from samfirmware.com: direct link
Extract (unzip) the firmware file
Download Odin v3.12.7
Open Odin v3.12.7 (make sure to Run as administrator)
Reboot ...
- 369
3
votes
Accepted
What is this triangle system notification icon on Samsung Galaxy S9+?
That's a Data saver icon.
The icon is different from the data saver icon in stock Android.
Samsung started to use this data saver icon in Android Oreo update as
explained in this guide
This ...
- 10.1k
3
votes
Can airplane mode be maintained during a system update?
If you want to block communication with your mobile network provider there is a second option: You just have to make sure the MNO can not identify your devices.
You can easily achieve that by ...
- 20.2k
3
votes
Where to find information about WiFi connectivity of the device?
You can use various Wifi/network analysis apps from Play Store to get some of the information you're looking for. I suggest IP Tools. In its default screen/view, you would get to see following ...
- 25.1k
3
votes
Accepted
SystemUI.apk is not in /system/app
Since Android 4.4, all privileged system apps including SystemUI have been moved to /system/priv-app.
- 9,539
Only top scored, non community-wiki answers of a minimum length are eligible