android - 魅族设备上 Editor.updateCursorPositionMz 出现 NullPointerException

Question

最近，我的 Android 应用程序出现了崩溃，仅限魅族设备（M5c、M5s、M5 Note）。安卓版本：6.0。

这是完整的堆栈跟踪：

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.text.Layout.getLineForOffset(int)' on a null object reference
   at android.widget.Editor.updateCursorPositionMz(Editor.java:6964)
   at android.widget.Editor.updateCursorsPositions(Editor.java:1760)
   at android.widget.TextView.getUpdatedHighlightPath(TextView.java:5689)
   at android.widget.TextView.onDraw(TextView.java:5882)
   at android.view.View.draw(View.java:16539)
   at android.view.View.updateDisplayListIfDirty(View.java:15492)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3719)
   at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3699)
   at android.view.View.updateDisplayListIfDirty(View.java:15443)
   at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:286)
   at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:292)
   at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:327)
   at android.view.ViewRootImpl.draw(ViewRootImpl.java:3051)
   at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2855)
   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2464)
   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1337)
   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6819)
   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:894)
   at android.view.Choreographer.doCallbacks(Choreographer.java:696)
   at android.view.Choreographer.doFrame(Choreographer.java:631)
   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:880)
   at android.os.Handler.handleCallback(Handler.java:815)
   at android.os.Handler.dispatchMessage(Handler.java:104)
   at android.os.Looper.loop(Looper.java:207)
   at android.app.ActivityThread.main(ActivityThread.java:5969)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:720)

与我的代码没有直接关系（即使在其他线程的 stracktraces 中）。我只知道它每次都发生在有 TextViews 的片段中。当 TextView 获得焦点时可能会发生这种情况，但我无法确定。当然，我无法重现该错误，除非我购买了魅族。

另外，由于调用了 top 方法updateCursorPositionMz，在我看来这可能是魅族 FlymeOS 的内部问题（“Mz”=“魅族”？）。

有没有人遇到过这个问题，知道原因以及如何解决？

谢谢。

标签： androidtextviewmeizu

Answer 1

更新（2019 年 8 月 8 日）

正如@andreas-wenger、@waseefakhtar 和@vadim-kotov 所提到的，该修复程序现在包含在com.google.android.material:material:1.1.0-alpha08之后。

旧答案

终于有机会接触到魅族了。正如我所想的，每次用户单击某个字段以获得焦点时都会发生崩溃。

就我而言，我有一些android.support.design.widget.TextInputEditTextinside TextInputLayouts。只需将这些TextInputEditTexts替换为AppCompatEditTexts 即可解决问题，如下所示：

<android.support.design.widget.TextInputLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="...">

    <android.support.v7.widget.AppCompatEditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</android.support.design.widget.TextInputLayout>

行为保持不变（因为TextInputEditTextextends AppCompatEditText）。不过，我仍然没有找到问题的根本原因。