Multidex issue with Flutter

Question

I\'m getting the following error compiling with gradle using Flutter in Android Studio:

Dex: Error converting bytecode to dex:
Cause: com.android.dex.DexExce         


        

Answer 1

If you don't have experience with developing android application this information can be helpful otherwise you won't find anything new.

---

How to enable multidex for flutter project.

1. Enable multidex.

Open project/app/build.gradle and add following lines.

defaultConfig {
    ...

    multiDexEnabled true
}

and

dependencies {
    ...

    implementation 'com.android.support:multidex:1.0.3'
}

2. Enable Jetifier.

Open project/android/app/gradle.properties and add following lines.

android.useAndroidX=true
android.enableJetifier=true

NOTE: As of flutter 1.7, the below steps are no longer necessary.

---

3) **Create custom application class.**

If you don't know where to create the file do it near MainActivity for example project/android/app/src/main/kotlin(or java if you didn't enable kotlin)/your/great/pakage/appname/

kotlin example: App.kt

    package your.great.pakage.appname
    
    import io.flutter.app.FlutterApplication
    import android.content.Context
    import androidx.multidex.MultiDex
    
    class App : FlutterApplication() {
    
        override fun attachBaseContext(base: Context) {
            super.attachBaseContext(base)
            MultiDex.install(this)
        }
    
    }

java example: App.java

    package your.great.pakage.appname;
    
    import io.flutter.app.FlutterApplication;
    import android.content.Context;
    import androidx.multidex.MultiDex;

    public class App extends FlutterApplication {

        @Override
        protected void attachBaseContext(Context base) {
            super.attachBaseContext(base);
            MultiDex.install(this);
        }

    }

4. Change the default application file to new.

Open project/android/app/src/main/AndroidManifest.xml

Change android:name="io.flutter.app.FlutterApplication" to android:name=".App"