驗證了警報對話框

Question

大家好， 林在比賽中工作，當玩家完成了水平而言，我要求球員在警告對話框上的EditText輸入他的名字：

AlertDialog.Builder builder = new Builder(this); 
     LayoutInflater inflater = getLayoutInflater(); 

     // Inflate and set the layout for the dialog 
     // Pass null as the parent view because its going in the dialog layout 

     builder.setView(inflater.inflate(R.layout.dialog_name, null)) 
     // Add action buttons 
       .setPositiveButton(R.string.alertName, new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, int id) { 

         playerText = (EditText) ((AlertDialog)dialog).findViewById(R.id.username); 
         if(playerText.getText() != null && playerText.getText().length() != 0) 
          Helper.currentPlayer.setName(playerText.getText().toString()); 
         //calculate the score 

         // save in data base 
         PlayerDataSource playerDS = new PlayerDataSource(getApplicationContext()); 
         playerDS.open(); 
         Helper.currentPlayer = playerDS.createPlayer(Helper.currentPlayer.getName(), Helper.currentPlayer.getScore(), 
           Helper.currentPlayer.levels, Helper.currentPlayer.times, LanguageHelper.div); 
         playerDS.close(); 
         saveStmc(); 
         mainScene.setChildScene(choicesMenu, false, true, true); 

        } 
       }) 
       .setTitle("Please Enter Your name") 
       .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int id) { 

        } 
       }); 
     alert = builder.create(); 

當玩家進入他的名稱並按確定（肯定按鈕）如果名稱存在或不存在，我將檢查數據庫，如果名稱存在：顯示Toast並且不關閉提醒以寫入其他名稱。怎麼做？

Answer 1

Set the dilaog as cancelable true and overide the onBackPressed() Method if need and 

    AlertDialog.Builder builder = new Builder(this); 
    builder.setCancelable(true); 

// onBackPressed其設置爲true，當你遇到你在對話框

@Override 
public void onBackPressed(){ 
    if(IsNameInserted) 
    super.onBackPressed(); 
} 

Answer 2

必要的顯示方式：

AlertDialog.Builder builder = new Builder(this); 
     LayoutInflater inflater = getLayoutInflater(); 

     // Inflate and set the layout for the dialog 
     // Pass null as the parent view because its going in the dialog layout 

     builder.setView(inflater.inflate(R.layout.dialog_name, null)) 
     // Add action buttons 
       .setPositiveButton(R.string.alertName, new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, int id) { 

         playerText = (EditText) ((AlertDialog)dialog).findViewById(R.id.username); 
         if(playerText.getText() != null && playerText.getText().length() != 0) 
          Helper.currentPlayer.setName(playerText.getText().toString()); 
         //calculate the score 

         // save in data base 
         PlayerDataSource playerDS = new PlayerDataSource(getApplicationContext()); 
         playerDS.open(); 

         /////Here check for name in database 
         if (name does not exist) 
         { 

         Helper.currentPlayer = playerDS.createPlayer(Helper.currentPlayer.getName(), Helper.currentPlayer.getScore(), 
           Helper.currentPlayer.levels, Helper.currentPlayer.times, LanguageHelper.div); 
         playerDS.close(); 
         saveStmc(); 
         mainScene.setChildScene(choicesMenu, false, true, true); 
         builder.dismiss() 
         } 
         else 
         { 
          Toast.makeText(getApplicationContext(), "Enter other name..", 
       Toast.LENGTH_SHORT).show(); 
         } 
        } 
       }) 
       .setTitle("Please Enter Your name") 
       .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int id) { 

        } 
       }); 
     builder.setCanceledOnTouchOutside(false);    
     alert = builder.create(); 
     builder.show() 

Answer 3

我已經找到了解決方案，它是基於覆蓋OnClick()爲AlertDialog的正向按鈕，這裏是解決方案：

 AlertDialog.Builder builder = new Builder(this); 
     LayoutInflater inflater = getLayoutInflater(); 

     // Inflate and set the layout for the dialog 
     // Pass null as the parent view because its going in the dialog layout 

     builder.setView(inflater.inflate(R.layout.dialog_name, null)) 

       .setPositiveButton(R.string.alertName, new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, int id) { 


        } 
       }) 
       .setTitle("Please Enter Your name"); 
     builder = builder.setCancelable(false); 
     alert = builder.create(); 

     alert.setOnShowListener(new OnShowListener() { 

       @Override 
       public void onShow(DialogInterface dialog) { 
        alert = (AlertDialog)dialog; 
        Button b = alert.getButton(AlertDialog.BUTTON_POSITIVE); 
        b.setOnClickListener(new View.OnClickListener() { 

         @Override 
         public void onClick(View view) { 
           playerText = (EditText) ((AlertDialog)alert).findViewById(R.id.username); 
           if(playerText.getText() == null || playerText.getText().length() == 0) 
           { 

            showToastMsg("Please enter valid name"); 
           } 
           else 
           { 

            if(nameIsExist()) 
            { 
             showToastMsg("Name already exist!!"); 
            } 
            else 
            { 
             //Do stuff because every this is OK 
             alert.dismiss(); 
            } 

           } 

         } 
        }); 
       } 
      });