刪除表情 （踩坑）

发现有的表情占一个长度，有的表情占2个长度，于是就如下兼容

使用：

val index = etSend.selectionStart
deleteText(index)

方案：

fun deleteText(index:Int) {
        if (index > 0) {
            val text1 = etSend.text.toString().substringV2(index-1,index)
            val text2 = etSend.text.toString().substringV2(index-2,index)
            Log.i("deleteText", "deleteText: "+text1+" / "+text1.length + " / "+AndroidEmoji.isEmoji(text1))
            Log.i("deleteText", "deleteText: "+text1.length)
            if (AndroidEmoji.isEmoji(text1)){
                etSend.text?.delete(index-1, index)
                return
            }
            if (AndroidEmoji.isEmoji(text2)&&text2.length==2){
                etSend.text?.delete(index-2, index)
            }else{
                etSend.text?.delete(index-1, index)
            }
        }
    }