[Android Auto General] Jen94:
Still wait for some methods? Oh, it is!

Here is NO-ROOT method to add designed for android auto app, to the screen of your car! Just told to your device that your app installed from Google Play.

Use adb as described here: https://stackoverflow.com/questions/39265358/android-auto-app-testing (mobile-debug.apk is an app that need to install from PC)

adb push mobile-debug.apk /sdcard/app.apk
adb shell pm install -i "com.android.vending" -r /sdcard/app.apk
adb shell rm /sdcard/app.apk

Want without PC? Use special flags!

Attached app "asKing.apk" great to install the app as if it were downloaded from Google Play. Just select a file and press Install. Use custom file manager like Total Commander to correct select file, if your path starts with /root - remove /root from a path (string with path is editable). For example, /root/storage/emulated/0/Download/tmp/my.apk - not correct, but /storage/emulated/0/Download/tmp/my.apk is OK.

It work on all AA on Android 10 and lower, on Android 11 and higher it works on AA 6.3 and lower or AA 6.6 and higher (exclude 6.4 and 6.5 if we be simple)

But if you have Android 11 and Android Auto 6.4 or 6.5 seems to it use this that works like this and cannot change without root.

However, with root you can got it (It is only on Android 11, if you have Android 10 and lower, can use without root with any version AA.).

Before you start root manipulations, just imagine that your phone may stop booting losting all data, as this is an important system file!

See system name of your car APP, that you want add to the car screen AA. com.best.app for example! It must be already installed. Actions below told your device that it from Google Play (car app updates are installed in the same way, it is unlikely that it will be possible to update from Android)

So reboot to TWRP and connect to PC with adb.

Then, open command line on your pc!

adb pull /data/system/packages.xml

Near adb appears file packages.xml on your PC

Open it with any text editor. Find by your system app name:

<package name="com.best.app" codePath="/data/app/com.best.app-1" nativeLibraryPath="/data/app/com.best.app-1/lib" primaryCpuAbi="arm64-v8a" publicFlags="675855940" privateFlags="0" ft="179523e9258" it="179523ea69a" ut="179523ea69a" version="1" userId="10215">

And add this (installer="com.android.vending" installInitiator="com.android.vending") to end before the closing tag. If it already in file, but not equals "com.android"vending", it need to correct this. Example for this case:

<package name="com.best.app" codePath="/data/app/com.best.app-1" nativeLibraryPath="/data/app/com.best.app-1/lib" primaryCpuAbi="arm64-v8a" publicFlags="675855940" privateFlags="0" ft="179523e9258" it="179523ea69a" ut="179523ea69a" version="1" userId="10215" installer="com.android.vending" installInitiator="com.android.vending">

Be aware, installInitiator needs only in Android 11 and high.

If your Android is 10 or lower, and installInitiator were not in packages.xml, you should not add it to file - add only installer.

Save file on your PC and push to device:

adb push packages.xml /data/system/packagesnew.xml
adb shell "cat /data/system/packagesnew.xml > /data/system/packages.xml"
adb shell rm /data/system/packagesnew.xml

Very important not remove or not completely rewrite /data/system/packages.xml - only replace text in this. So using cat instead mv/rm/cp.

Reboot mobile. If it booted, youre lucky. If not, return to TWRP, do all again to prevent errors, or remove on your own risk file /data/system/packages.xml from TWRP (adb shell rm /data/system/packages.xml). Next booting will long, system recreate this file... maybe. Always has a chance! For lost your data also. So always have your backup and do all tihis for your own risk!

Want without PC? Oh, sure, but be careful, I warned you!

Just use attached changeInstaller.apk [ROOT ONLY] instead of all the described actions with the computer adb!

1. Install

2. At the first start, grant root rights and access to the repository. After issuing the rights, close and reopen the application. It is important.

3. Select the application from the list that you want to mark as installed from Google Play. Its status will appear. On the left is a log of events, on the right - errors, there should be no errors

4. Press Start, wait for the status to change. We carry out the procedure for all the necessary applications

5. Press Force Reboot and wait for reboot.

Booted? Excellent.

Didn't load? At the root of the internal sdcard is the packages_backups folder with the packages.xml backup.

Check out the manual version of the solution to understand what has been fixed and what to look for.

Remember that /data/system/packages.xml cannot be overwritten, only change the text inside.

All of this is only for testing your apps.