Android Tutorial: KeyEvent

This tutorial will show you how to handle when a user press the Back key.

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event)
    {
        // IF CLICK BACK BUTTON
        if (keyCode == KeyEvent.KEYCODE_BACK)
        {
            //INSTRUCT WHAT HAPPEN HERE
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }