Inject Koin in Java classes

I'm trying to replace Dagger 2 to [Koin][1] in my current project and I don't want to rewrite some classes in Kotlin to use it.

Is possible to inject with Koin in java classes?


In Kotlin is just

// Inject MyPresenter
val presenter : MyPresenter by inject()


Thanks


[1]:

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A class or file can either have .kt extension means Kotlin, or have .java extension means Java. You can't write a file or class in both the languages simultaneously.

But your Java and Kotlin files can talk with each other, i.e you can a Java class with a variable and access that variable in your Kotlin file or vice-versa.

So you can inject a Kotlin class reference and use that in your Java class and Vice-versa.

This might help:

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I hope that clears the doubt.

It is, make sure you import in gradle the koin for java library and use above answers.

Gradle:

implementation "org.koin:koin-java:2.0.1"

following code worked for me **without** org.koin:koin-java:$koin_version dependency:

private MyPresenter presenter = org.koin.java.KoinJavaComponentKoinJavaComponent.inject(MyPresenter.class).getValue();

You no longer need the additional `koin-java` dependency as this is now a part of `koin-android` & `koin-core`.

```java
// Imports
import static org.koin.java.KoinJavaComponent.get;
import static org.koin.java.KoinJavaComponent.inject;
import static org.koin.core.qualifier.QualifierKt.named;
import static org.koin.core.parameter.DefinitionParametersKt.parametersOf;

// Lazy injection
Lazy<MyDependency> dependency = inject(MyDependency.class);

// Eager injection
MyDependency dependency = get(MyDependency.class);

// Named injection
get(MyDependency.class, named("MyNamedDependency"));

// Parameter injection
get(MyDependency.class, null, () -> parametersOf(this));
```

[Koin Android Java docs][1]


[1]:

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Yes it is Possible.
Just sync project with this gradle file

implementation "org.koin:koin-java:$koin_version"

In your java class replace

// Inject MyPresenter
private val presenter : MyPresenter by inject()


with

private Lazy<MyPresenter> presenter = inject(MyPresenter.class);


and get presenter method inside Java class like

presenter.getValue().sayHello()

Use

// Java Compatibility
implementation "io.insert-koin:koin-android-compat:$koin_version"

Instead

implementation "org.koin:koin-java:$koin_version"


Don't forget

// Add Maven Central to your repositories if needed
repositories {
mavenCentral()
}


Importante point

> Due to Jcenter shutdown, the koin project's maven group id was
> previously org.koin and is now io.insert-koin. Please check your
> configuration with modules below.

See official documentation [here][1]


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Have a good job!