Leaving android app with back button

Question

I want the users of my android app to leave my app when they press back at a certain activity. Can this be done?

Answer 1

You can use moveTaskToBack() in the onBackPressed() method to exit app.

@Override
public void onBackPressed() {
    moveTaskToBack(true);
}

Hope this helps,

Thanks

Answer 2

I know this is an old post. But this might be helpful for someone just as it was to me, who wants to implement the same feature in their application.

The solution for identifying double back can be done by calculating the time between two back press. If the difference is less than 2seconds (i.e. 2000 milliseconds) then you can accept that as double back press and exit from the application. Otherwise display the Toast message.

Simple implementation of this would be:

private static long back_pressed;

@Override
public void onBackPressed()
{
        if (back_pressed + 2000 > System.currentTimeMillis()) 
            super.onBackPressed();
        else 
            Toast.makeText(getBaseContext(), "Press once again to exit!",Toast.LENGTH_SHORT).show();

        back_pressed = System.currentTimeMillis();
}

The code can be found in this link