解决“java.lang.NullPointerException:Attempt to read from field

最新推荐文章于 2025-04-17 08:27:03 发布

搬砖的杨先生

最新推荐文章于 2025-04-17 08:27:03 发布

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分类专栏：异常信息文章标签： android

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本文记录了解决Java中常见的NullPointerException异常的过程，特别是在Android视图绘制时出现的问题。异常源于后台数据返回null，未进行判空处理导致。解决方案是在接口请求回调中增加数据判空逻辑。

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解决异常 java.lang.NullPointerException: Attempt to read from field ‘int android.view.View.mViewFlags’ on a null object reference 记录一下

很多资料都写的是动画加载问题
我自己的代码没有任何动画所以不存在动画加载问题那么只能排查！最后发现是后台数据返回不正确导致
正常是在返回data 和分页 pageEntity 对象是有数据的！这次返回都是null 导致渲染数据没有判空出现的问题

解决方式接口请求回调方法中在渲染数据的时候判空就可以了下面是异常信息

java.lang.NullPointerException: Attempt to read from field 'int android.view.View.mViewFlags' on a null object reference
        at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3197)
        at android.view.View.updateDisplayListIfDirty(View.java:14162)
        at android.view.View.getDisplayList(View.java:14189)
        at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3389)
        at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3368)
        at android.view.View.updateDisplayListIfDirty(View.java:14127)
        at android.view.View.getDisplayList(View.java:14189)
        at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3389)
        at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3368)
        at android.view.View.updateDisplayListIfDirty(View.java:14127)
        at android.view.View.getDisplayList(View.java:14189)
        at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3389)
        at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3368)
        at android.view.View.updateDisplayListIfDirty(View.java:14127)
        at android.view.View.getDisplayList(View.java:14189)
        at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3389)
        at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3368)
        at android.view.View.updateDisplayListIfDirty(View.java:14127)
        at android.view.View.getDisplayList(View.java:14189)
        at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:273)
        at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:279)
        at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:318)
        at android.view.ViewRootImpl.draw(ViewRootImpl.java:2554)
        at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2376)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2006)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1085)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5909)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
        at android.view.Choreographer.doCallbacks(Choreographer.java:580)
        at android.view.Choreographer.doFrame(Choreographer.java:550)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5305)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)