当用户点击后退按钮退出应用程序时显示警告

Question

我想知道当用户尝试退出应用程序时如何显示警告？所以这包括如果他们也按下后退按钮。什么是最好的方法来做到这一点？

我在某些主流游戏中看到了这一点。

Answer 1

您可以在您的Application子类截获后退按钮添加onBackPressed()：

public static void onBackPressed(final Activity activity) { 
    AlertDialog.Builder builder = new AlertDialog.Builder(activity); 
    builder.setTitle(R.string.on_back_button_title); 
    builder.setMessage(R.string.on_back_button_message); 
    builder.setPositiveButton(R.string.yes, new OnClickListener() { 
     @Override 
     public void onClick(DialogInterface dialog, int which) { 
      activity.finish(); 
     } 
    }); 
    builder.setNegativeButton(R.string.no, new OnClickListener() { 
     @Override 
     public void onClick(DialogInterface dialog, int which) { 

     } 
    }); 
    builder.show(); 
} 

Answer 2

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    /*if (keyCode == KeyEvent.KEYCODE_HOME) { 
     Log.i("Home Button", "Clicked"); 
     // Toast.makeText(this,"Home Button Clicked",Toast.LENGTH_LONG).show(); 
     return false; 
    }*/ // You cannot gain control over home button 

    if (keyCode == KeyEvent.KEYCODE_BACK) { 
     Toast.makeText(this, "Press back Button to pause Evaluation", 
       Toast.LENGTH_LONG).show(); 
     Log.i("Back Button", "Clicked"); 
     return false; 
     // finish(); 
    } 
    return false; 
}