Koin for Android Java app

JavaApp.java

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        // Call helper to start Koin
        JavaAppKoinKt.start(this);
    }
}

public class MainActivity extends AppCompatActivity {

    MainActivityHolder holder = new MainActivityHolder();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //... 
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //...

                // Use my components here
                holder.getJComp().sayHello();
                holder.getKComp().sayHello();
            }
        });
    }
}

JavaAppKoin.kt

// A module with Kotlin and Java components
val module = applicationContext {
    bean { KotlinComponent() }
    bean { JavaComponent() }
}

// Start
fun start(myApplication: Application) {
    // Start Koin with given Application instance
    startKoin(listOf(module)) with (myApplication)
}

// Dependency holder
class MainActivityHolder : KoinComponent {
    val kComp: KotlinComponent by inject()
    val jComp: JavaComponent by inject()
}

JavaComponent.java

public class JavaComponent {

    public void sayHello() {
        System.out.println("Hello Koin from Java");
    }
}

KotlinComponent.kt

class KotlinComponent {

    fun sayHello() = println("Hello Koin from Kotlin")
}

Thanks! You saved my day!

👍

Thanks a lot!