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我有这个例外：

java.lang.NullPointerException
        at android.webkit.WebViewClassic.requestFocus(WebViewClassic.java:10003)
        at android.webkit.WebView.requestFocus(WebView.java:2133)
        at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:2382)
        at android.view.ViewGroup.requestFocus(ViewGroup.java:2338)
        at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:2382)
        at android.view.ViewGroup.requestFocus(ViewGroup.java:2338)
        at android.view.ViewGroup.onRequestFocusInDescendants(ViewGroup.java:2382)
        at android.view.ViewGroup.requestFocus(ViewGroup.java:2341)
        at android.view.View.requestFocus(View.java:6538)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1899)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1110)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4472)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
        at android.view.Choreographer.doCallbacks(Choreographer.java:555)
        at android.view.Choreographer.doFrame(Choreographer.java:525)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
        at android.os.Handler.handleCallback(Handler.java:615)
        at android.os.Handler.dispatchMessage(Handler.java:92)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4918)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
        at dalvik.system.NativeStart.main(Native Method)

但它并没有告诉我它发生在哪条线上或其他任何东西。知道如何调试吗？

谢谢，亚历克斯

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