ClickableSpan 的高阶 function

Question

I'm trying to capture the click on a textview with links. To achieve this:

• I created a BindingAdapter which has two params (a: TextView, clickListener: () -> Unit).

• Inside the BindingAdapter:

  •  val clickableSpan = object: ClickableSpan() { override fun onClick(widget: View) = onClickListener.invoke() } ```

• In a ViewModel I created a fun processUrl() { Code Here }

• In the layout.xml:
  • <TextView app:infowithlinks="@{() -> model.processUrl()}"

All that works well, I would like when I click the link on the TextView be able to send the Url to the function inside the ViewModel.

Thanks in advance.

Answer 1

You should expand the onClickListener to accept the String. Then invoke it with argument.

  @BindingAdapter("infowithlinks")
    fun TextView.setOnSpanClickListener(clickListener:Function1<String, Unit>){
        val clickableSpan = object : ClickableSpan() {
            override fun onClick(widget: View){
              with(text as SpannableString) {
                val clickableSpan = getSpans<ClickableSpan>()
                    .first() // probably search correct one
                val start = getSpanStart(clickableSpan)
                val end = getSpanEnd(clickableSpan)
                val url = text.subSequence(start, end).toString()
                clickListener(url)
               }
            }
        }  
        //....

    }

On the xml you'll have

<TextView app:infowithlinks="@{model.processUrl}"

And in the view model

fun processUrl(url : String){

}