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Usage of PixelUtil causes crash on the app start

See original GitHub issue

Description

We got lots of following crash on our app at production:

Caused by java.lang.NullPointerException: Attempt to read from field 'float android.util.DisplayMetrics.density' on a null object reference
       at android.util.TypedValue.applyDimension(TypedValue.java:391)
       at com.facebook.react.uimanager.PixelUtil.toPixelFromDIP(PixelUtil.java:18)
       at com.swmansion.rnscreens.ScreenStackFragment.<clinit>(ScreenStackFragment.java:64)
       at java.lang.reflect.Constructor.newInstance0(Constructor.java)
       at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
       at androidx.fragment.app.Fragment.instantiate(Fragment.java:548)
       at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57)
       at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:390)
       at androidx.fragment.app.FragmentStateManager.<init>(FragmentStateManager.java:74)
       at androidx.fragment.app.FragmentManager.restoreSaveState(FragmentManager.java:2454)
       at androidx.fragment.app.FragmentController.restoreSaveState(FragmentController.java:196)
       at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:287)
       at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:115)
       at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:44)

It is caused by usage of PixeUtil to assign static variable at start.

My commit may fix this. Since I don’t know how to reproduce this on my test devices, I will test on production app and will open a pull request.

Package versions

React: 16.9.0, 17.0.1
React Native: 0.63.2, 0.64.2
React Native Screens: 3.4

Issue Analytics

State:
Created 2 years ago
Comments:6 (5 by maintainers)

Top GitHub Comments

1reaction

sercandcommented, Aug 1, 2021

@WoLewicki PR doesn’t affect the changing shadow hidden/shown setting. I believe we can merge the PR.

1reaction

sercandcommented, Jul 22, 2021

@WoLewicki I don’t know to reproduce the crash. The app just crashes on start before loading any screen. It happens on different android versions and different vendors randomly. I tested it on production because I don’t know to reproduce it and we no longer see the crash.

Our apps don’t use toolbar and I will check it later to confirm if it is still working.

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