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