How can I programmatically click a Button in Jetpack Compose?

With this solution you will get the ripple effect programmatically like you have pressed the button:

1) Create interactionSource:

val interactionSource: MutableInteractionSource = remember { MutableInteractionSource() }

2) Create coroutine scope:

val coroutine = rememberCoroutineScope()

3) In your button set interaction source:

Button(
    onClick = {
        vm.myFunction()
    },
    //important
    interactionSource = interactionSource,
    .
    .
    .
)

4) Finally call it like so from anywhere:

coroutine.launch {
    val press = PressInteraction.Press(Offset.Zero)
    interactionSource.emit(press)
    vm.myFunction()
    delay(300)
    interactionSource.emit(PressInteraction.Release(press))
}

In compose you're creating a button with action. You can pass action function and call same function programmatically.

// you need to remember your callback to prevent extra recompositions.
// pass all variables that may change between recompositions
// as keys instead of `Unit`
val onClickAction = remember(Unit) { 
    {
        
        // do some action
    }
}

LaunchedEffect(Unit) {
    // perform action in 1 sec after view appear
    delay(1000)
    onClickAction()
}
Button(
    onClick = onClickAction
) {
    Text(text = "Button")
}

I'd write an instrumentation test with ComposeTestRule for this. performClick() generally works as expected for me on a SemanticNodeInteraction object.

I did run into a problem where it only worked when the element was currently visible though, so I needed to call performScrollTo() first:

composeTestRule.onNode(...).run {
    performScrollTo()
    performClick()
}

A very simple solution for that.

1. Create a state variable

     val verifyNumberOnClick = remember { mutableStateOf(false) }
   

2. Create a private function that can be used as an action for onClick.

    private fun makeSum(a: Int, b: Int){
        Log.e("Atiar", "Sum of a & b: ${a+b}")
    }
   

3. Create if-else to run that function.

    if (verifyNumberOnClick.value){
        makeSum(5,6)
        verifyNumberOnClick.value = false
    }
   

4. You are done. now it's your time to change the value of verifyNumberOnClick to true.

from anywhere, you will make it true your function will be called. means you can perform onclick tasks from anywhere.

as sample you can change the value of verifyNumberOnClick from button on click.

Button(
    onClick = {verifyNumberOnClick.value = false}
) {
    Text(text = "Button")
}