How can I call flow method from Java code.
fun getAllUsers(): Flow<List<User>> =
userRepositoryImpl.getAllUsers()
from Java
private Observable<List<User>> getUsers() {
subscriber.onNext(userViewModel.getAllUsers()); //example
}
If what you want to do is collecting a flow, you can do like this.
Define coroutine helper functions in a Kotlin file.
object JavaFlow {
@JvmStatic
fun <T> collectInJava(
scope: CoroutineScope,
flow: Flow<T>,
action: (T) -> Unit
): Job {
return scope.launch {
flow.collect {
action(it)
}
}
}
// this function is just for testing
@JvmStatic
fun getFlow(from: Int, to: Int): Flow<Int> = flow {
val range = from until to
range.forEach {
delay(50)
emit(it)
}
}
}
then In Java, you can call collectInJava to collect a flow.
public class JavaMain {
public static void main(String[] args) {
Flow<Integer> flow = JavaFlow.getFlow(0, 5);
CoroutineScope scope = () -> EmptyCoroutineContext.INSTANCE; // create a new scope
JavaFlow.collectInJava(
scope,
flow,
(i) -> {
System.out.println(i);
return Unit.INSTANCE;
}
);
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}