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The project uses Android support libraries such as v4, v7, etc., And a dependant library uses AndroidX dependencies. And the app crashes when the dependant library uses the AndroidX class.

java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/core/content/ContextCompat;

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  • Migrate to androidx: developer.android.com/jetpack/androidx/migrate#migrate
    – Gabriele Mariotti
    Commented Aug 8, 2019 at 10:06
  • migrate old project to androidx use new material themes and add other dependencies
    – Pemba Tamang
    Commented Aug 8, 2019 at 10:14
  • Yes, migration is an easy solution, but why does it crash? Is AndroidX not compatible with support libraries?
    – Sarath Natesan
    Commented Aug 8, 2019 at 10:23
  • AndroidX contains support librairies. So you have conflicts with both librairies.
    – Johann67
    Commented Aug 8, 2019 at 12:18

1 Answer 1

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Convert all the support libraries to androidX and in every class and xml file convert the imports and views to androidX.

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