Using kotlin extension function in Java code

Question

I have created an extension function for listening to click listener for buttons, when I try to access it from Java code it does not work,

Cannot access clicks() from java file, this is what I tried

Can you please suggest how to resolve this.

Thanks R

File - Extension.kt

   fun Button.clicks(): Flow<Unit> = callbackFlow {
        setOnClickListener {
            offer(Unit)
        }
        awaitClose { setOnClickListener(null) }
    }

In my java code - FillingFragment.java

 @NotNull
    @Override
    public Flow<Void> getStartFillingObservableFlow() {
        return dataViewHolder.btnStartFilling.clicks(); //CLICKS IS NOT. RECOGNISED
    }

DataViewHolder.Java

  @BindView(R.id.start_filling_action)
    public Button btnStartFilling;

Andrei Tanana · Accepted Answer · 2021-01-17 16:31:13Z

1

Extension functions usually compiles to statics functions so you can invoke them like this:

ExtensionKt.clicks(dataViewHolder.btnStartFilling);

answered Jan 17, 2021 at 16:31

Andrei Tanana

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5 Comments

BRDroid Over a year ago

Hello @andei, I tried that and able to access it now

BRDroid Over a year ago

It gives me an error Required type: Flow <Void> Provided: Flow <Unit>

BRDroid Over a year ago

how can I make the extension function return void?

BRDroid Over a year ago

or should I be working with Unit instead of void

Andrei Tanana Over a year ago

I think your getStartFillingObservableFlow function should return Flow<Unit>

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