[SOLVED] Check if app belongs to system apps or to apps signed with platform key

Check if app belongs to system apps or to apps signed with platform key

I am developing custom Android launcher and I have an option to uninstall apps directly from program list. Now, I would like to remove uninstall option for apps that can't get uninstalled, i.e. system apps, apps signed with platform keys...

I found in ActivityInfo class following flags

    /**
     * Value for {@link #privateFlags}: whether this app is signed with the
     * platform key.
     * @hide
     */
    public static final int PRIVATE_FLAG_SIGNED_WITH_PLATFORM_KEY = 1 << 20;

    /**
     * Value for {@link #privateFlags}: whether this app is pre-installed on the
     * system_ext partition of the system image.
     * @hide
     */
    public static final int PRIVATE_FLAG_SYSTEM_EXT = 1 << 21;

but apparently, I get Unresolved reference: PRIVATE_FLAG_SYSTEM_EXT compilation error, even though these flags are public and static. I am not sure why is that.

Is there any other way so I can check for given package name does that app belong to to system apps or to apps signed with platform key?

Checking for ApplicationInfo.FLAG_SYSTEM and ApplicationInfo.FLAG_UPDATED_SYSTEM_APP flags doesn't work for me for some reason.

Solution

Actually, ApplicationInfo.FLAG_SYSTEM and ApplicationInfo.FLAG_UPDATED_SYSTEM_APP flags do work, but they were tested against the wrong flags. Here is the correct code:

val applicationInfo = packageManager.getApplicationInfo(packageName, 0)
val isSystem =
                (applicationInfo.flags and ApplicationInfo.FLAG_SYSTEM != 0) ||
                (applicationInfo.flags and ApplicationInfo.FLAG_UPDATED_SYSTEM_APP != 0)