沒有顯示alertdialog框

DialogInterface.OnClickListener clickListener= new DialogInterface.OnClickListener() { 
      @Override 
      public void onClick(DialogInterface dialog, int which) { 
       switch (which) 
       { 
        case BUTTON_POSITIVE : 
         udb.signout(); 
         break; 

        case BUTTON_NEGATIVE: 
         finish(); 
         break; 
       } 
      } 
     }; 

     AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext()); 
     builder.setTitle("Notification"); 
     builder.setMessage("You are already logged in.\nDo you want to signout and login with different account?"); 
     builder.setPositiveButton("Yes",clickListener); 
     builder.setNegativeButton("No",clickListener); 
     builder.show();

這是我的代碼顯示彈出對話框..但我得到問題「builder.show（）」行。我不明白我做錯了什麼。請。我會感謝任何幫助沒有顯示alertdialog框

來源

2016-04-20 Ameya Joshi

考慮添加錯誤消息 –

首先，我親自測試設備上，

builder.show();

應該有作爲

AlertDialog dialog = builder.create(); 
dialog.show();

無論android.support.v7同樣的效果.app.AlertDialog或使用android.app.AlertDialog。

在我的情況下，我發現是什麼導致問題是AlertDialog.Builder被初始化。

AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());

從Dialog documentation，你需要在活動傳遞給此構造，其中以下將工作：

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

，或者

AlertDialog.Builder builder = new AlertDialog.Builder(<YourActivity>.this);

來源

2016-04-20 18:39:20 solosodium

它工作正常，當我更新AlertDialog.Builder builder = new AlertDialog.Builder（ .this）; –

感謝您的幫助.. –

首先調用builder.create（）。您無法顯示構建器本身。

來源

2016-04-20 18:03:20 kylexy1357

是不是'.create（）'？ – Bonatti

@Bonatti謝謝你的錯誤 – kylexy1357

你有你的AlertDialog.Builder的create對話框，然後顯示它...刪除builder.show();

AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext()); 
builder.setTitle("Notification"); 
builder.setMessage("You are already logged in.\nDo you want to signout and login with different account?"); 
builder.setPositiveButton("Yes",clickListener); 
builder.setNegativeButton("No",clickListener); 


AlertDialog alert = builder.create(); 
alert.show();

來源

2016-04-20 18:05:16 Mohit

您需要使用AlertDialog.Builder對象創建AlertDialog對象並顯示對話框。對於例如，

AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext()); 

/*All your dialog code*/ 

//Create AlertDialog object 
AlertDialog alertDialog = builder.create(); 
//show the AlertDialog using show() method 
alertDialog.show();

來源

2016-04-20 18:35:26 Rutvik

沒有顯示alertdialog框

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