使用 ViewGroup 抛出 NullPointerException
有谁知道这可能是什么原因造成的？
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$MethodAndArgsCaller.run(ZygoteInit.java:862)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at dalvik.system.NativeStart.main(Native Method)
Does anyone have a clue what could be causing this?
11-16 16:23:26.745: ERROR/AndroidRuntime(9549): Uncaught handler: thread main exiting due to uncaught exception
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): java.lang.NullPointerException
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:692)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:692)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at android.view.ViewRoot.performTraversals(ViewRoot.java:722)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at android.view.ViewRoot.handleMessage(ViewRoot.java:1658)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at android.os.Handler.dispatchMessage(Handler.java:99)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at android.os.Looper.loop(Looper.java:123)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at android.app.ActivityThread.main(ActivityThread.java:4363)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at java.lang.reflect.Method.invokeNative(Native Method)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at java.lang.reflect.Method.invoke(Method.java:521)
11-16 16:23:26.765: ERROR/AndroidRuntime(9549): at com.android.internal.os.ZygoteInit$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)
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这个错误过去经常出现在我们的崩溃报告中。追踪起来非常困难，但最后我们发现有时会触发代码，从 surfaceDestroyed()（SurfaceHolder 的回调方法）中删除视图层次结构中的视图。如果您的应用程序使用 SurfaceView，请确保您没有执行任何操作来修改 surfaceDestroyed() 中的视图层次结构。
This error used to show up in our crash reports with some regularity. It was very difficult to track down, but in the end we discovered that we sometimes triggered code that removed a view from the view hierarchy from surfaceDestroyed() (the callback method from SurfaceHolder). If your app is using a SurfaceView, make sure you don't do anything to modify the view hierarchy in surfaceDestroyed().