listView记忆功能

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使用场景

listView中有单选按钮的时候, 需要记住单选按钮的勾选状态,
在测试list的时候, 如果list绑定的数据多了之后, 我们在滑动上下几次之后

单选按钮的勾选状态就不正确了

本来是勾选的, 变成了不勾选
本来是不勾选的, 变成了勾选

autojs版本

8.7.7-0

事出有因

导致这个错误的原因是list的回收复用,
当控件从可见到不可见, 再从不可见到可见的时候,
会重新给控件绑定数据
就这绑定数据这一步发成了错误

解决办法

绑定数据这一步需要重写,
我们不适用list,
而是使用原生的RecyclerView
详细的类名 androidx.recyclerview.widget.RecyclerView

代码讲解

1. 导入类

importClass(Packages.androidx.recyclerview.widget.RecyclerView);
importClass(Packages.androidx.recyclerview.widget.LinearLayoutManager);

2. 布局

ui.layout(
  <vertical>
    <vertical>
      <text textSize="30sp" w="*" gravity="center" textStyle="bold">
        牙叔教程 简单易学
      </text>
      <button id="addUser">创建新房间</button>
      <button id="showData">显示房间数据</button>
      <androidx.recyclerview.widget.RecyclerView id="roomList" h="*" w="*" />
    </vertical>
  </vertical>
);

3. recycleView子控件视图

let boxXml = (
  <vertical w="*" padding="8" margin="50">
    <radiogroup id="roomList" orientation="horizontal">
      <radio text="房间1号"></radio>
      <radio text="房间2号"></radio>
    </radiogroup>
    <text id="time"></text>
  </vertical>
);

4. 创建adapter

function createGiftBoxAdapter(roomList) {
  return RecyclerView.Adapter({
    onCreateViewHolder: function (parent, viewType) {
      log("onCreateViewHolder");
      // 视图创建
      let view;
      let holder;
      view = ui.inflate(boxXml, parent, false);
      holder = JavaAdapter(RecyclerView.ViewHolder, {}, view);
      view.time.click(function () {
        toastLog(view.time.text());
      });
      view.roomList.setOnCheckedChangeListener({
        onCheckedChanged: function (radioGroup, checkedId) {
          let checkView = view.findViewById(checkedId);
          let room = roomList[holder.getPosition()];
          if (!checkView.isPressed()) {
            //没有被点击
            if (room.name) {
              if (holder.itemView.roomList.getChildAt(0).getText().toString() === room.name) {
                holder.itemView.roomList.getChildAt(0).checked = true;
              } else if (holder.itemView.roomList.getChildAt(1).getText().toString() === room.name) {
                holder.itemView.roomList.getChildAt(1).checked = true;
              }
            } else {
              holder.itemView.roomList.getChildAt(0).checked = false;
              holder.itemView.roomList.getChildAt(1).checked = false;
            }
            return true;
          }
          if (checkView.checked) {
            room.name = checkView.getText().toString();
            toastLog("选中了" + room.name);
            log(room);
            log(roomList);
          } else {
            toastLog("没选中");
            room.name = "";
          }
        },
      });

      return holder;
    },
    onBindViewHolder: function (holder, position) {
      log("onBindViewHolder");
      // 数据绑定
      let room = roomList[position];
      holder.itemView.time.setText(room.time);
      if (room.name) {
        if (holder.itemView.roomList.getChildAt(0).getText().toString() === room.name) {
          holder.itemView.roomList.getChildAt(0).checked = true;
        } else if (holder.itemView.roomList.getChildAt(1).getText().toString() === room.name) {
          holder.itemView.roomList.getChildAt(1).checked = true;
        }
      } else {
        holder.itemView.roomList.getChildAt(0).checked = false;
        holder.itemView.roomList.getChildAt(1).checked = false;
      }
    },
    getItemCount: function () {
      return roomList.length;
    },
  });
}

5. 给recycleView设置adapter

//设置Adapter
recycleAdapter = createGiftBoxAdapter(roomList);
recyclerView.setAdapter(recycleAdapter);

6. 添加房间

function addRoom() {
  log(arguments.callee.name);
  roomList.push(formatRoomInfo());
  ui.roomList.post(function () {
    ui.roomList.smoothScrollToPosition(roomList.length);
  });
  recycleAdapter.notifyDataSetChanged();
}

7. 格式化房间信息

function addRoom() {
  log(arguments.callee.name);
  roomList.push(formatRoomInfo());
  ui.roomList.post(function () {
    ui.roomList.smoothScrollToPosition(roomList.length);
  });
  recycleAdapter.notifyDataSetChanged();
}

8. 控件随机背景色

function getRndColor() {
  let color = new java.util.Random();
  return colors.toString((randomColor = colors.rgb(color.nextInt(256), color.nextInt(256), color.nextInt(256))));
}

参考文章

声明

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