致命異常：java.lang.ArrayIndexOutOfBoundsException 長度=12； 三星設備 6.0.1 android 版本上的 index=12

Question

致命異常：java.lang.ArrayIndexOutOfBoundsException 長度=12； index=12 我只在 samsung 6.0.1(android version) 設備上遇到這個錯誤。我沒有在任何其他 android 設備上遇到這個錯誤

堆棧跟蹤在下面有關於 crashlytics 的崩潰報告，但我無法重現錯誤。

Fatal Exception: java.lang.ArrayIndexOutOfBoundsException: length=12; index=12 at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1833) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at android.view.ViewGroup.dispatchTransformedGenericPointerEvent(ViewGroup.java:2176) at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1878) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at android.view.ViewGroup.dispatchTransformedGenericPointerEvent(ViewGroup.java:2176) at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1878) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at android.view.ViewGroup.dispatchTransformedGenericPointerEvent(ViewGroup.java:2176) at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1878) at android.widget.ScrollView.dispatchHoverEvent(ScrollView.java:1107) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at android.view.ViewGroup.dispatchTransformedGenericPointerEvent(ViewGroup.java:2176) at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1878) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at android.view.ViewGroup.dispatchTransformedGenericPointerEvent(ViewGroup.java:2176) at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1878) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at android.view.ViewGroup.dispatchTransformedGenericPointerEvent(ViewGroup.java:2176) at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1878) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at android.view.ViewGroup.dispatchTransformedGenericPointerEvent(ViewGroup.java:2176) at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1878) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at android.view.ViewGroup.dispatchTransformedGenericPointerEvent(ViewGroup.java:2176) at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1878) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at android.view.ViewGroup.dispatchTransformedGenericPointerEvent(ViewGroup.java:2176) at android.view.ViewGroup.dispatchHoverEvent(ViewGroup.java:1878) at android.view.View.dispatchGenericMotionEvent(View.java:10074) at com.android.internal.policy.PhoneWindow$DecorView.superDispatchGenericMotionEvent(PhoneWindow.java:2839) at com.android.internal.policy.PhoneWindow.superDispatchGenericMotionEvent(PhoneWindow.java:1873) at android.app.Activity.dispatchGenericMotionEvent(Activity.java:3082) at android.support.v7.view.WindowCallbackWrapper.dispatchGenericMotionEvent(WindowCallbackWrapper.java:70) at com.android.internal.policy.PhoneWindow$DecorView.dispatchGenericMotionEvent(PhoneWindow.java:2806) at android.view.View.dispatchPointerEvent(View.java:10230) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5344) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5180) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4620) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4673) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4639) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4781) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4647) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4838) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4620) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4673) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4639) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4647) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4620) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7306) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7184) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7145) at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7416) at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) at android.os.MessageQueue.nativePollOnce(MessageQueue.java) at android.os.MessageQueue.next(MessageQueue.java:323) at android.os.Looper.loop(Looper.java:143) at android.app.ActivityThread.main(ActivityThread.java:7229) at java.lang.reflect.Method.invoke(Method.java) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Answer 1

在android.view.ViewGroup.dispatchHoverEvent函數中，有一個數組。 我們稱之為foo 。

foo.length為 12。

但是有人在第 1833 行寫了foo[n]因為n是 12。

現在允許這樣做，因為對於長度為 12. n的數組， n必須介於 0 和 11 之間（包括 0 和 11）。 順便說一下，這是一個非常常見的錯誤。

我希望這有點用。 如果有的話，它演示了堆棧跟蹤是多么有用。