監(jiān)聽(tīng)返回鍵

@Override  
    public boolean onKeyDown(int keyCode, KeyEvent event)  
    {  
        if (keyCode == KeyEvent.KEYCODE_BACK )  
        {  
            // 創(chuàng)建退出對(duì)話框  
            AlertDialog isExit = new AlertDialog.Builder(this).create();  
            // 設(shè)置對(duì)話框標(biāo)題  
            isExit.setTitle("系統(tǒng)提示");  
            // 設(shè)置對(duì)話框消息  
            isExit.setMessage("確定要退出嗎");  
            // 添加選擇按鈕并注冊(cè)監(jiān)聽(tīng)  
            isExit.setButton("確定", listener);  
            isExit.setButton2("取消", listener);  
            // 顯示對(duì)話框  
            isExit.show();  
  
        }  
          
        return false;  
          
    }  

監(jiān)聽(tīng)對(duì)話框里面的button點(diǎn)擊事件

    DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener()  
    {  
        public void onClick(DialogInterface dialog, int which)  
        {  
            switch (which)  
            {  
            case AlertDialog.BUTTON_POSITIVE:// "確認(rèn)"按鈕退出程序  
                finish();  
                break;  
            case AlertDialog.BUTTON_NEGATIVE:// "取消"第二個(gè)按鈕取消對(duì)話框  
                break;  
            default:  
                break;  
            }  
        }  
    };