我的应用程序被强制关闭，但从查看堆栈跟踪来看，我的代码实际上并没有被引用，而且我没有使用 WebViewClassic 对象。有任何想法吗？
?:??: W/?(?): java.lang.NullPointerException
?:??: W/?(?): at android.webkit.WebViewClassic.setBaseLayer(WebViewClassic.java:4447)
?:??: W/?(?): at android.webkit.WebViewClassic.setNewPicture(WebViewClassic.java:7825)
?:??: W/?(?): at android.webkit.WebViewClassic$PrivateHandler.handleMessage(WebViewClassic.java:7211)
?:??: W/?(?): at android.os.Handler.dispatchMessage(Handler.java:99)
?:??: W/?(?): at android.os.Looper.loop(Looper.java:137)
?:??: W/?(?): at android.app.ActivityThread.main(ActivityThread.java:4745)
?:??: W/?(?): at java.lang.reflect.Method.invokeNative(Native Method)
?:??: W/?(?): at java.lang.reflect.Method.invoke(Method.java:511)
?:??: W/?(?): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
?:??: W/?(?): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
?:??: W/?(?): at dalvik.system.NativeStart.main(Native Method)