Flutter Projects & Android X Migration Issues

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As you are creating a new project, just follow @harsh ‘s answer and you’re done.

However, as I recently upgraded my existing app to use new plugins, I had to migrate to AndroidX as well… and the default procedure in the official instructions didn’t work, which is using Android Studio to migrate the project – it said “No usages found!”.

So what I did was:

  1. updated Android Studio to 3.3
  2. tried menu Refactor > Migrate to AndroidX
  3. got “No usages found” (if you manage to do it here instead, stop! you’re done! … actually, you can give this answer a try before continuing)
  4. opened android/gradle.properties and added
android.useAndroidX=true
android.enableJetifier=true

  1. opened android/build.gradle and changed

    • com.android.tools.build:gradle to version 3.3.0
    • com.google.gms:google-services to version 4.2.0

  2. opened android/app/build.gradle and

    • changed compileSdkVersion to 28
    • replaced android.support.test.runner.AndroidJUnitRunner to androidx.test.runner.AndroidJUnitRunner
    • replaced com.android.support.test:runner to androidx.test:runner:1.1.0
    • replaced com.android.support.test.espresso:espresso-core to androidx.test.espresso:espresso-core:3.1.0
    • in my case that was it, but here’s the complete list of required replacements

  3. opened android/gradle/wrapper/gradle-wrapper.properties and changed distributionUrl to https\://services.gradle.org/distributions/gradle-4.10.2-all.zip (you might have to use 5.4.1, please see update below)

  4. executed flutter clean

And contrary to what I expected, IT WORKED! 🙂

UPDATE (2019 October 27th)

When updating my app to flutter v1.9.1+hotfix.5, as I use app signing, I was stuck with the error SigningConfig "release" is missing required property "storePassword" and in the end it was the gradle version from step 7 above. So now I’m using 5.4.1 as suggested in this wiki.

[android/gradle/wrapper/gradle-wrapper.properties]

distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip

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