如何使用换行内容检测高度已更改的edittext

Question

我想在文本更改后检测edittext高度更改。 edittext的高度为wrap_content。如果edittext更改了行号，我将把recyclerview smoothScrolltoposition设置为底部。

我的代码。

var lineNumber: Int = 0;
this.edtMessage.addTextChangedListener(object: TextWatcher {
    override fun afterTextChanged(s: Editable?) {

       if (lineNumber != edtMessage.lineCount && messages.size > 0)
            recyclerView.smoothScrollToPosition(messages.size - 1);
    }

    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
        lineNumber = edtMessage.lineCount;
    }

    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {

    }
});