Didn't find class “androidx.core.content.FileProvider”

Question

I migrated my app to AndroidX and it\'s crashing on launch on API level 21. My application throws this exception:

10-08          


        

Answer 1

The documentation is outdated; use androidx.multidex for androidx:

implementation "androidx.multidex:multidex:2.0.1"

AndroidManifest.xml:

<application
    android:name="androidx.multidex.MultiDexApplication">
</application>

Use the Jetifier when it still uses any com.android.support libraries:

android.enableJetifier=true

Answer 2

add below ndk lib support to your project if you have used the external library -

ndk
     {
        abiFilters "armeabi-v7a", "x86", "x86_64", "arm64-v8a"
     }

inside the default config of your app level build.gradle file

defaultConfig 
    {
        applicationId "org.comcast.net"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        ndk
                {
                    abiFilters "armeabi-v7a", "x86", "x86_64", "arm64-v8a"
                }
    }

it has solved my problem, hopefully it will solve at your end also.

Answer 3

It seems that this error came from incomplete configuration of MultiDex in your app. Here you may find the similar issue and here is an article answering it.

I suggest you to check the following (extending App class helped me):

Your Application class (App.class, for instance, if you use it) should extend from MultiDexApplication class:

public class BaseApplication extends MultiDexApplication {}

or if you don't use Application class check your manifest:

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.android.multidex.myapplication">
        <application
            ...
            android:name="android.support.multidex.MultiDexApplication">
            ...
        </application>
    </manifest>

Answer 4

The problem is your React Native android project is not in AndroidX while react-native-image-picker is in an AndroidX environment; therefore, it is missing packages from the androidx package library.

Simple fix is adding the following lines to your ./android/gradle.properties file:

android.useAndroidX=true
android.enableJetifier=true

If you have any existing RN libraries that uses old android packages, your project won't build since they will be missing once you updated your project.

A clever tool found here deals with RN libraries that uses old android packages and brings them up to date.

npm i --save-dev jetifier
npx jetify
react-native run-android

All checked out and it's working on my end. Hope this helps anyone and please do share if it does.

Source https://github.com/react-native-community/react-native-image-picker/issues/1088#issuecomment-509755692