Flutter Development: Migrating a Flutter App to AndroidX

First, the official documentation: https://flutter.dev/docs/development/packages-and-plugins/androidx-compatibility

There are two approaches: one completed automatically by Android Studio, and one that manually modifies the dependency configuration. The official docs recommend the first, but it didn’t work for me, so I used the second and got it running successfully~

Automatic Method

Use Android Studio to migrate your app

This requires the latest version of Android Studio. Use the following instructions:

1. Import your Flutter app into Android Studio so that the IDE can parse the Android code following the steps in Editing Android code in Android Studio with full IDE support.
2. Follow the instructions for Migrating to AndroidX.

Manual Method

Manually migrate your app

See Migrating to AndroidX for more detailed instructions on how to do this. Below are some steps that you’ll likely need to go through as part of this process, listed here for reference. However the specific things you need to do will depend on your build configuration and could differ from the example changes suggested here.

1. In android/gradle/wrapper/gradle-wrapper.properties change the line starting with distributionUrl like this: distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip

2. In android/build.gradle, replace: content_copy

dependencies {
    classpath 'com.android.tools.build:gradle:3.2.1'
}

by

dependencies {
    classpath 'com.android.tools.build:gradle:3.3.0'
}

1. In android/gradle.properties, append

android.enableJetifier=true
android.useAndroidX=true

1. In android/app/build.gradle: Under android {, make sure compileSdkVersion and targetSdkVersion are at least 28.

2. Replace all deprecated libraries with the AndroidX equivalents. For instance, if you’re using the default .gradle files make the following changes: In android/app/build.gradle testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" by testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

Finally, under dependencies {, replace

androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

by

androidTestImplementation 'androidx.test.runner:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'

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