Android“无法添加窗口——令牌空值不适用于应用程序"异常 [英] Android 'Unable to add window -- token null is not for an application' exception

问题描述

当我尝试打开对话框时出现以下 Android 异常.有人可以帮我了解发生了什么，我该如何解决这个问题?

I get the following Android exception when I try to open a dialog. Can someone please help me understand what is going on and how can I fix this problem?

android.view.WindowManager$BadTokenException: 
  Unable to add window -- token null is not for an application
    at android.view.ViewRoot.setView(ViewRoot.java:509)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
    at android.app.Dialog.show(Dialog.java:241)

推荐答案

我在猜测 - 您是否正在尝试使用应用程序上下文创建 Dialog?像这样:

I'm guessing - are you trying to create Dialog with an application context? Something like this:

new Dialog(getApplicationContext());

这是错误的.您需要使用活动上下文.

This is wrong. You need to use an Activity context.

你必须尝试:

new Dialog(YourActivity.this);

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