Force application to restart on first activity

android

For an unknown reason, I can't get my application leaving properly so that when I push the home button and the app icon again, I resume where I was in the app. I would like to force the application to restart on the first Activity.

I suppose this has something to do with onDestroy() or maybe onPause() but I don't know what to do.

Solution 1:

Here is an example to restart your app in a generic way by using the PackageManager:

Intent i = getBaseContext().getPackageManager()
             .getLaunchIntentForPackage( getBaseContext().getPackageName() );
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i);

Solution 2:

The solution marked as 'answer' works but has one disadvantage that was critical for me. With FLAG_ACTIVITY_CLEAR_TOP your target activity will get onCreate called before your old activity stack receives onDestroy. While I have been clearing some necessary stuff in onDestroy I had to workaroud.

This is the solution that worked for me:

public static void restart(Context context, int delay) {
    if (delay == 0) {
        delay = 1;
    }
    Log.e("", "restarting app");
    Intent restartIntent = context.getPackageManager()
            .getLaunchIntentForPackage(context.getPackageName() );
    PendingIntent intent = PendingIntent.getActivity(
            context, 0,
            restartIntent, Intent.FLAG_ACTIVITY_CLEAR_TOP);
    AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    manager.set(AlarmManager.RTC, System.currentTimeMillis() + delay, intent);
    System.exit(2);
}

The idea is to fire a PendingIntent via AlarmManager that will be invoked a bit later, giving old activity stack some time to clear up.

Solution 3:

if you want to always start at the root you want to set android:clearTaskOnLaunch to true on your root activity

Solution 4:

android:clearTaskOnLaunch="true"
android:launchMode="singleTask"

Use this property in manifest file in starting class (first activity).

Solution 5:

Does FLAG_ACTIVITY_CLEAR_TOP do what you need to do?

Intent i = new Intent(getBaseContext(), YourActivity.class);
            i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(i);