Android中的對話框界面中的軟鍵代碼行

Question

如何在DialogInterface.OnClickListner正面按鈕中執行後退命令？我想首先詢問用戶他/她是否想要回到之前的活動。我試過super.onBackPressed();，但它不是一個有效的代碼。 這裏是我的代碼：

@Override 
    public void onBackPressed(){ 

    DialogInterface.OnClickListener confirm = new DialogInterface.OnClickListener() { 

     @Override 
     public void onClick(DialogInterface dialog, int which) { 
      // TODO Auto-generated method stub 
      switch(which){ 
      case DialogInterface.BUTTON_POSITIVE:{ 
       //execute back function 
       super.onBackPressed(); 
       break; 
      } 
      case DialogInterface.BUTTON_NEGATIVE:{ 
       //Do nothing, just stay on the current activity 
      } 

      } 
     } 
    }; 
    AlertDialog.Builder msgbox = new AlertDialog.Builder(this); 
    msgbox.setMessage("Are you sure you want to go back?"); 
    msgbox.setPositiveButton("Yes", confirm); 
    msgbox.setNegativeButton("No", confirm); 
    msgbox.show(); 
} 

的super.onBackPressed();是給我這個錯誤提示The method onBackPressed() is undefined for the type object

Answer 1

OK，我已經修改了代碼，以滿足您的需求。這應該做的。

@Override 
    public void onBackPressed(){ 

    DialogInterface.OnClickListener confirm = new DialogInterface.OnClickListener() { 

     @Override 
     public void onClick(DialogInterface dialog, int which) { 
      // TODO Auto-generated method stub 
      switch(which){ 
      case DialogInterface.BUTTON_POSITIVE:{ 
       //execute back function 
       finish(); 
       break; 
      } 
      case DialogInterface.BUTTON_NEGATIVE:{ 
       //Do nothing, just stay on the current activity 
       break; 
      } 

      } 
     } 
    }; 
    AlertDialog.Builder msgbox = new AlertDialog.Builder(this); 
    msgbox.setMessage("Are you sure you want to go back?"); 
    msgbox.setPositiveButton("Yes", confirm); 
    msgbox.setNegativeButton("No", confirm); 
    msgbox.show(); 
}