使用ViewGroup抛出NullPointerException

Question

有没有人知道这是什么原因？

11-16 16:23:26.745: ERROR/AndroidRuntime(9549): Uncaught handler: thread main exiting due to uncaught exception
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): java.lang.NullPointerException
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:692)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:692)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at android.view.ViewRoot.performTraversals(ViewRoot.java:722)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1658)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at android.os.Looper.loop(Looper.java:123)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at android.app.ActivityThread.main(ActivityThread.java:4363)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at java.lang.reflect.Method.invokeNative(Native Method)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at java.lang.reflect.Method.invoke(Method.java:521)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:862)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

这个错误过去经常出现在我们的崩溃报告中。这很难追踪，但最后我们发现，我们有时会触发代码，从surfaceDestroyed() (来自SurfaceHolder的回调方法)中删除视图层次结构中的视图。如果您的应用程序正在使用SurfaceView，请确保您没有对surfaceDestroyed()中的视图层次结构进行任何修改。