Your app isn't using AndroidX - Flutter doesn't allow me to generate apk

Question

I developed an app in flutter with Visual Studio code on Mac. I ran the application without any kind of problem on IOS. I also installed it on a physical device and it works perfectly, but I have a problem generating the Android project study and its APK on with flutter.

Message:

flutter build appbundle
[!] Your app isn't using AndroidX.
    To avoid potential build failures, you can quickly migrate your app by following the
    steps on ...
Running Gradle task 'bundleRelease'...                                  
Note: Some input files use unchecked or unsafe operations.      
Running Gradle task 'bundleRelease'...                                                     Note: Recompile with -Xlint:unchecked for details.              
Running Gradle task 'bundleRelease'...                                                                                                        
Running Gradle task 'bundleRelease'... Done                       217,9s (!)
Gradle build failed to produce an .aab file. It's likely that this file was generated under
/Users/riccardo/Desktop/QuoteFlutter/quote/build, but the tool couldn't find it.

Answer 1

in my own case my gradle.properties was missing. I Just created a new gradle.properties file inside the android folder, with the below parameter

org.gradle.jvmargs=-Xmx1536M
android.useAndroidX=true
android.enableJetifier=true
android.enableR8=true

Answer 2

The error description clearly states that

Your app isn't using AndroidX. To avoid potential build failures, you can quickly migrate your app by following the steps on ...

How to resolve this?

Follow this detailed documentation.

Answer 3

you should go to

YourAppName=> android => gradle.properties

inside gradle.properties add these two lines

android.useAndroidX=true
android.enableJetifier=true

dat should solve it.

Answer 4

I had an old project using Firestore, that I was trying to open, and got this message. I could not find any easy way to fix it.

These were the steps I took to migrate it, hope it helps someone.

Create a new folder.

Then run this command in Terminal, in the folder:

flutter create --org com.yourdomain your_app_name

Copy the files from lib folder, (and any other modifications from android or ios folders).

Copy google-services.json to android\app folder.

Modify pubspec.yaml and copy the dependencies under dependencies:

Change android\app\build.gradle change version to:

minSdkVersion 21

Add the plugins needed in android\app\build.gradle:

apply plugin: 'com.google.gms.google-services'

In Android\build.gradle file: Add the dependency (with your version):

classpath 'com.google.gms:google-services:4.3.3'