重置活动堆栈而不启动新活动

Question

I have a broadcast reciever triggered by an alarm event, which checks if the application is being idle (user is not active). Now I would like to reset the activity stack and bring the application to the first / default activity.

But If I do something like this:

Intent intent = new Intent(context, StartUp.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP 
                | Intent.FLAG_FROM_BACKGROUND | Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);

then my application comes to the foreground.

I would like to do it silently so the user will not be disrupted by my application (as aparently he is doing something else).

So my question is how do I clear the activity stack without launching an activity?

Answer 1

Checking whether any of your activities is on the foreground seems to be covered over here , though I have not tried it. Then if you want to terminate the whole application just do:

System.runFinalizersOnExit(true);
System.exit(0);

And you are done. Hope this will help you.

Answer 2

On top of my head, why not save the state to for example the shared preferences and when user launches your application again you can detect it needs to be cleared and relaunch the activity. Ie use a concept of delaying the reset of the stack. There are probably other implications such as SharedPreferences in BroadcastReceiver seems to not update? , just to give an idea.