android show dialog exception or android.view.windowManager BadTokenException

今天在开发的时候，要显示一个Dialog出现如下的错误：

 W/dalvikvm(29843): threadid=3: thread exiting with uncaught exception (group=0x4 000fe70) E/AndroidRuntime(29843): Uncaught handler: thread main exiting due to uncaught e xception E/AndroidRuntime(29843): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application E/AndroidRuntime(29843): at android.view.ViewRoot.setView(ViewRoot.java:4 29) E/AndroidRuntime(29843): at android.view.WindowManagerImpl.addView(Window ManagerImpl.java:178) E/AndroidRuntime(29843): at android.view.WindowManagerImpl.addView(Window ManagerImpl.java:91) E/AndroidRuntime(29843): at android.app.Dialog.show(Dialog.java:231) E/AndroidRuntime(29843): at android.app.AlertDialog$Builder.show(AlertDia log.java:802) E/AndroidRuntime(29843): at com.android.library.GalleryAdapter.dealItemCl ick(GalleryAdapter.java:607) E/AndroidRuntime(29843): at com.android.library.GalleryAdapter.access$0(G alleryAdapter.java:571) E/AndroidRuntime(29843): at com.android.library.GalleryAdapter$1.onClick( GalleryAdapter.java:391) E/AndroidRuntime(29843): at android.view.View.performClick(View.java:2179 ) E/AndroidRuntime(29843): at android.view.View.onTouchEvent(View.java:3828 ) E/AndroidRuntime(29843): at android.widget.TextView.onTouchEvent(TextView .java:6291) E/AndroidRuntime(29843): at android.view.View.dispatchTouchEvent(View.jav a:3368) E/AndroidRuntime(29843): at android.view.ViewGroup.dispatchTouchEvent(Vie wGroup.java:863) E/AndroidRuntime(29843): at android.view.ViewGroup.dispatchTouchEvent(Vie wGroup.java:863) E/AndroidRuntime(29843): at android.view.ViewGroup.dispatchTouchEvent(Vie wGroup.java:863) E/AndroidRuntime(29843): at android.view.ViewGroup.dispatchTouchEvent(Vie wGroup.java:863) E/AndroidRuntime(29843): at android.view.ViewGroup.dispatchTouchEvent(Vie wGroup.java:863) E/AndroidRuntime(29843): at android.view.ViewGroup.dispatchTouchEvent(Vie wGroup.java:863) E/AndroidRuntime(29843): at android.view.ViewGroup.dispatchTouchEvent(Vie wGroup.java:863) E/AndroidRuntime(29843): at com.android.internal.policy.impl.PhoneWindow$ DecorView.superDispatchTouchEvent(PhoneWindow.java:1707) E/AndroidRuntime(29843): at com.android.internal.policy.impl.PhoneWindow. superDispatchTouchEvent(PhoneWindow.java:1197) E/AndroidRuntime(29843): at android.app.Activity.dispatchTouchEvent(Activ ity.java:1993) E/AndroidRuntime(29843): at com.android.internal.policy.impl.PhoneWindow$ DecorView.dispatchTouchEvent(PhoneWindow.java:1691) E/AndroidRuntime(29843): at android.view.ViewRoot.handleMessage(ViewRoot. java:1525) E/AndroidRuntime(29843): at android.os.Handler.dispatchMessage(Handler.ja va:99) E/AndroidRuntime(29843): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime(29843): at android.app.ActivityThread.main(ActivityThrea d.java:3948) E/AndroidRuntime(29843): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime(29843): at java.lang.reflect.Method.invoke(Method.java:5 21) E/AndroidRuntime(29843): at com.android.internal.os.ZygoteInit$MethodAndA rgsCaller.run(ZygoteInit.java:782) E/AndroidRuntime(29843): at com.android.internal.os.ZygoteInit.main(Zygot eInit.java:540) E/AndroidRuntime(29843): at dalvik.system.NativeStart.main(Native Method) I/Process ( 580): Sending signal. PID: 29843 SIG: 3 I/dalvikvm(29843): threadid=7: reacting to signal 3 I/dalvikvm(29843): Wrote stack trace to '/data/anr/traces.txt'

 

解决方法，Dialog实例化的时候我开始传进去的是context(context = getApplicationContext())，改成传进去的XXXXActivity.this就可以了。