[MaterialCalendarGridView] NullPointerException in onDraw in 1.3.0

Description: I’m receiving a similar bug to https://github.com/material-components/material-components-android/issues/1338, but using version “1.3.0”

I don’t have steps to reproduce, but It occurred on different devices with different android versions. Maybe there is a trick with language, most users are using ‘fr’.

Expected behavior: expect the app will not crash

Source code:

private fun showDatePicker(from: DateTime, to: DateTime, onSubmit: (DateTime, DateTime) -> Unit) {
        val datePicker = MaterialDatePicker.Builder.dateRangePicker()
        datePicker.setSelection(Pair(from.millis, to.millis))
        val dialog = datePicker.build()
        dialog.addOnPositiveButtonClickListener {
            onSubmit(DateTime(it.first), DateTime(it.second))
        }
        dialog.show(parentFragmentManager, dialog.javaClass.simpleName)
    }

Android API versions: 29, 28, 27, 26

Material Library version: 1.3.0

Devices: Huawei P20 Xiaomi Redmi 9 Samsung Galaxy S7 Samsung Galaxy S7 edge Samsung Galaxy A41 Samsung Galaxy Note 10 Samsung Galaxy S9 OnePlus 6

Stacktrace:

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getLeft()' on a null object reference
       at com.google.android.material.datepicker.MaterialCalendarGridView.horizontalMidPoint(MaterialCalendarGridView.java)
       at com.google.android.material.datepicker.MaterialCalendarGridView.onDraw(MaterialCalendarGridView.java:221)
       at android.view.View.draw(View.java:23187)
       at android.widget.AbsListView.draw(AbsListView.java:7190)
       at android.view.View.updateDisplayListIfDirty(View.java:22062)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.updateDisplayListIfDirty(View.java:22048)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at androidx.recyclerview.widget.RecyclerView.drawChild(RecyclerView.java)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.draw(View.java:23190)
       at androidx.recyclerview.widget.RecyclerView.draw(RecyclerView.java)
       at android.view.View.updateDisplayListIfDirty(View.java:22062)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.updateDisplayListIfDirty(View.java:22048)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.updateDisplayListIfDirty(View.java:22048)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.updateDisplayListIfDirty(View.java:22048)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.updateDisplayListIfDirty(View.java:22048)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.updateDisplayListIfDirty(View.java:22048)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.updateDisplayListIfDirty(View.java:22048)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.updateDisplayListIfDirty(View.java:22048)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.updateDisplayListIfDirty(View.java:22048)
       at android.view.View.draw(View.java:22917)
       at android.view.ViewGroup.drawChild(ViewGroup.java:5230)
       at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4987)
       at android.view.View.draw(View.java:23190)
       at com.android.internal.policy.DecorView.draw(DecorView.java:1154)
       at android.view.View.updateDisplayListIfDirty(View.java:22062)
       at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:588)
       at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:594)
       at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:667)
       at android.view.ViewRootImpl.draw(ViewRootImpl.java:4296)
       at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:4080)
       at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3348)
       at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2225)

I going to try the latest release 1.4.0-alpha01 of the library. But I can’t reproduce this issue by myself, so the only way is to receive crash information from Firebase, it’s painful. Maybe someone faced the same issue, will be thankful for any help.

[SashaCube]

I’m getting the same crash on Lenovo TB-8504X with Android 8.1.0. Many of our users getting this crash, all with the same model device and Android version. Tried everything, cannot reproduce even when using exactly the same device model and Android version. Using version 1.3.0 of the Material Components library with the bridge app theme Theme.MaterialComponents.Light.NoActionBar.Bridge.

We had the same problem on production recently. I have managed to reproduce it by using Foldable emulator. (You will find it in awd manager ). The only way to fix it was forking the project and fixing it in MaterialComponents.

I’ve used the same solution. Opened PR to this issue is based on fix which I used on prod, hope it will be rewived soon.

[mirjalal]

@vladyslavkhimich checkout this one. Additionally, I highly recommend you to read this issue 🙂 Cheers 🥳