is there a default back key(on device) listener in android?

Question

I am having two activities A and B. when i click the button in A that will shows B. when i click the Button in B it backs to A. i had set the overridePendingTransition metho

Answer 1

I use this code on an activity with a media player. I needed to stop the playback when user pressed the back button but still be able to go back to previous activity.

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        try{
            mp.stop(); //this line stops the player
            return super.onKeyDown(keyCode, event);//this line does the rest 
        }
        catch(IllegalStateException e){
            e.printStackTrace();
        }
        return true;
    }

    return super.onKeyDown(keyCode, event); //handles other keys
}