安卓 ListView 实现自动滚动到最新位置

主要就是这两个属性：

android:stackFromBottom="true"
android:transcriptMode="normal"

第一个属性表示从下到上显示数据，如果没加那就是这样的效果：

加了就是这样的效果：

第二个属性表示当前屏幕填满了就自动滚动到最新位置
用这个时还遇到过一个奇怪的坑，由于我的布局是这样的：

似乎是因为忘记加

导致 ListView 出现数据错误？反正修改后数据显示就正常了。
adapter 的 getView 方法：

override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
        val viewHolder: ViewHolder
        var nConvertView: View? = null

        if (convertView == null) {
            nConvertView = mInflater.inflate(R.layout.message_list, parent, false)
            viewHolder = ViewHolder()
            viewHolder.recvMessage = nConvertView.findViewById(R.id.recv_message_content)
            viewHolder.recvUserName = nConvertView.findViewById(R.id.recv_message_userName)
            viewHolder.recvHead = nConvertView.findViewById(R.id.recv_message_head)
            viewHolder.recvContainer = nConvertView.findViewById(R.id.recv_message_container)
            viewHolder.sentMessage = nConvertView.findViewById(R.id.sent_message_content)
            viewHolder.sentUserName = nConvertView.findViewById(R.id.sent_message_userName)
            viewHolder.sentHead = nConvertView.findViewById(R.id.sent_message_head)
            viewHolder.sentContainer = nConvertView.findViewById(R.id.sent_message_container)
            nConvertView.tag = viewHolder
        } else {
            viewHolder = convertView.tag as ViewHolder
        }

        val message = messages[position]
        if (message.status == Message.RECEIVED_MESSAGE) {
            viewHolder.recvContainer!!.visibility = View.VISIBLE
            viewHolder.sentContainer!!.visibility = View.GONE
            viewHolder.recvUserName!!.text = message.userName
            viewHolder.recvMessage!!.text = message.message
            viewHolder.recvHead!!.setImageResource(message.userHeadImg)
        } else if (message.status == Message.SENT_MESSAGE) {
            viewHolder.sentContainer!!.visibility = View.VISIBLE
            viewHolder.recvContainer!!.visibility = View.GONE
            viewHolder.sentUserName!!.text = message.userName
            viewHolder.sentMessage!!.text = message.message
            viewHolder.sentHead!!.setImageResource(message.userHeadImg)
        }

        return convertView ?: nConvertView!!
    }

    class ViewHolder {
        var sentMessage: TextView? = null
        var sentUserName: TextView? = null
        var sentHead: ImageView? = null
        var sentContainer: LinearLayout? = null

        var recvUserName: TextView? = null
        var recvMessage: TextView? = null
        var recvHead: ImageView? = null
        var recvContainer: LinearLayout? = null
    }
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