在Android开发中，遇到一个错误：`android.view.WindowManager$BadTokenException`，原因是尝试在一个无效的Context上添加Dialog。错误发生在使用`getApplicationContext()`创建AlertDialog.Builder时。正确的做法是使用Activity上下文，即`getActivity()`，来确保Dialog能正确显示。修正后的代码应为：`AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());`
Android：创建alertDialog报错(错误信息)：
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
at android.view.ViewRootImpl.setView(ViewRootImpl.java:525)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:407)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:321)
at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:152)
at android.app.Dialog.show(Dialog.java:301)
报错原因：创建dialog时传的参数有误，下面的写法会报错
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity().getApplicationContext());
参数传Context是有误的，应该传Activity 在context中不能增添窗体
正确的写法应该是：
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
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