SharedPreferences not being removed on user uninstalling application

Question

Has anyone encountered this issue on a Nexus 6P device? I am only getting this issue on a Nexus 6P (running Google Fi).

When I install the app there is a key for userIsLoggedIn inside SharedPreferences.

This block:

boolean userIsLoggedIn  = SharedPrefs.userIsLoggedIn(this);

// Then in another class...

 public static boolean userIsLoggedIn(Context context) {
    // For users updating apps, if the previous key-value is a string, convert it to boolean
    try {
        return context.getSharedPreferences(LOGIN_FILE, Context.MODE_PRIVATE)
                .getBoolean(USER_LOGGED_IN, false);
    } catch (ClassCastException e) {
        Logger.e(TAG, e.getMessage());
        context.getSharedPreferences(LOGIN, Context.MODE_PRIVATE)
                .edit()
                .putBoolean(USER_LOGGED_IN, false)
                .commit();
        return context.getSharedPreferences(LOGIN, Context.MODE_PRIVATE)
                .getBoolean(USER_LOGGED_IN, false);
    }
}

Now this should return false on a new uninstall but debugging this on a fresh install I get the following on App Startup.

I also running Proguard if that matters, when running the device on a non-proguard enabled APK it runs ok. Running proguard on any other devices runs fine.

Blurt

Have you checked with any other devices? Code seems fine. – Ulster

I think login is true somewhere in code because shared preference dont behave like that so please check that first. – Boisvert

That is definitely not the issue, this piece of code is run first. Have confirmed on 8 other devices. – Blurt

Answer 1

Since Nexus 6P is running Android M, I think Automatic Backups is the issue.

I think You can use allowBackup to stop that.

Check this answer: https://mcmap.net/q/331612/-android-m-weird-shared-preferences-issue

Drama

Answer 2

In android M and above versions they keep application backups in google driver, you can disable this by using, go to your project manifest file under Application section set android:allowBackup="true" to false.and you are good to go.

Evania

Answer 3

you can add to your manifest:

        android:fullBackupContent="false"

Duplessis