警报对话框不显示 [英] Alert dialog is not displaying

问题描述

大家好我正在通过点击按钮创建Android中警告对话框。我用XML和调用函数的OnClick属性。我的code是

 公共无效selectPhoneType（查看视图）
{
    的String []项目= {家，工作，手机，工作传真，住宅传真，寻呼机，其他，自定义};
    AlertDialog.Builder建设者=新AlertDialog.Builder（getApplicationContext（））;
    builder.setTitle（选择标签）;
    AlertDialog警报= builder.create（）;
    alert.show（）;}
 

但这种code未显示警告，并给予错误，如

  BadTokenException：无法添加窗口 - 令牌null不是一个应用程序。
 

请告诉我什么是错这个code。

解决方案

 新AlertDialog.Builder（getApplicationContext（））;
 

我想这就是问题所在。您是否尝试过：

 新AlertDialog.Builder（YourActivityClassName.this）;
 

Hi all i am creating an alert dialog in android by clicking a button. i used onClick property of XML and calling function. my code is

public void selectPhoneType(View view)
{
    String [] item = {"Home", "Work", "Mobile", "Work Fax", "Home Fax", "Pager", "Other", "Custom"};
    AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
    builder.setTitle("Select Label");
    AlertDialog alert = builder.create();
    alert.show();}

but this code is not showing alert and giving error like

BadTokenException: Unable to add window -- token null is not for an application. 

Please tell me what is wrong with this code.

解决方案

new AlertDialog.Builder(getApplicationContext());

I think this is the problem. Have you tried:

new AlertDialog.Builder(YourActivityClassName.this);

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