How to display progress drawable animation in Chip Material Component?

问题

According to the official Design docs for Action Chips, we are supposed to be able to add a progress state to chips. Sadly, the Development docs don't mention this at all. Has anyone managed to figure out how to achieve the effect shown here?

回答1:

It is possible to implement this behavior using the chipIcon attribute and androidx.swiperefreshlayout.widget.CircularProgressDrawable.

xml

app:chipIconWithProgress="@{viewModel.taskIsStarting ? null : @drawable/ic_play_arrow}"

and BindingAdapter

@BindingAdapter("chipIconWithProgress")

fun Chip.setChipIconWithProgress(item: Drawable?) {   
  chipIcon = item
    ?: CircularProgressDrawable(context!!).apply {
      setStyle(CircularProgressDrawable.DEFAULT)
      start()
    }
}

来源：https://stackoverflow.com/questions/54536053/how-to-display-progress-drawable-animation-in-chip-material-component