I have two icons for "Like" button - ic_thumb_up and ic_thumb_up_selected

The type of icon should depend on the offer.likedByUser parameter.

  var thumbIcon by remember {
       mutableStateOf(if (offer.likedByUser) R.drawable.ic_thumb_up_selected else R.drawable.ic_thumb_up)
  }



IconButton(
           onClick = {
              offer.likedByUser = !offer.likedByUser
          } 
    ) {
          Image(painter = painterResource(id = thumbIcon) )
  }

Why is it not working?

CodePudding user response：

This code

var thumbIcon by remember {
   mutableStateOf(if (offer.likedByUser) R.drawable.ic_thumb_up_selected else R.drawable.ic_thumb_up)
}

runs only once, and sets the value to either thumbs_up_selected or thumbs_up. You are not changing the mutableStateOf in your onClick handler, so nothing happens.

You need to change it like this

var thumbIconLiked by remember {
   mutableStateOf(offer.likedByUser)
}

IconButton(
       onClick = {
          thumbIconLiked = !thumbIconLiked
      } 
) {
      Image(painter = painterResource(
            id = if (thumbIconLIked) R.drawable.ic_thumb_up_selected else R.drawable.ic_thumb_up
        )
}