没有显示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();

这是我的代码显示弹出对话框..但我得到问题 “builder.show（）”行。我不明白我做错了什么。请。我会感谢任何帮助没有显示alertdialog框

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2016-04-20 Ameya Joshi

考虑添加错误消息 –

首先，我亲自测试设备上，

builder.show();

应该有作为

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

无论android.support.v7同样的效果.app.AlertDialog或使用android.app.AlertDialog。

在我的情况下，我发现是什么导致问题是AlertDialog.Builder被初始化。

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

从Dialog documentation，你需要在活动传递给此构造，其中以下将工作：

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

，或者

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

来源

2016-04-20 18:39:20 solosodium

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

感谢您的帮助.. –

首先调用builder.create（）。您无法显示构建器本身。

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2016-04-20 18:03:20 kylexy1357

是不是'.create（）'？ – Bonatti

@Bonatti谢谢你的错误 – kylexy1357

你有你的AlertDialog.Builder的create对话框，然后显示它...删除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();

来源

2016-04-20 18:05:16 Mohit

您需要使用AlertDialog.Builder对象创建AlertDialog对象并显示对话框。对于例如，

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();

来源

2016-04-20 18:35:26 Rutvik

没有显示alertdialog框

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