NullPointerException on Meizu devices in Editor.updateCursorPositionMz

Question

Lately, there have been crashes on my Android app, on Meizu devices only (M5c, M5s, M5 Note). Android version: 6.0.

Here is the full stack trace:

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) 

There is no direct relation to my code (even in other threads' stracktraces). I only know that it happens everytime in a Fragment in which there are TextViews. It might be happening when a TextView is gaining focus but I have no way of being sure. Of course I cannot reproduce the bug, unless I buy a Meizu.

Also, since the top method is called updateCursorPositionMz, it looks to me like this may be an internal issue in Meizu's FlymeOS ("Mz" = "Meizu"?).

Has anyone already had this issue, knows the cause and how to fix it?

Thanks.

Answer 1

Update (Aug. 8, 2019)

As @andreas-wenger, @waseefakhtar and @vadim-kotov mentioned, the fix is now included from com.google.android.material:material:1.1.0-alpha08 onwards.

Old answer

Finally I had the chance to put my hands on a Meizu. As I thought, the crash occurs every time the user clicks on a field to get the focus.

In my case, I had some android.support.design.widget.TextInputEditText inside TextInputLayouts. Simply replacing these TextInputEditTexts with AppCompatEditTexts fixed the problem, like so:

<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> 

The behavior remains the same (since TextInputEditText extends AppCompatEditText). I still haven't found the root cause of the problem though.

Answer 2

This was just fixed in the material components for Android lib, see: https://github.com/material-components/material-components-android/pull/358