Android中ListView + CheckBox实现单选、多选效果

Z时代
2024-01-10
分类：综合

还是先来看看是不是你想要的效果：

不废话，直接上代码，很简单，代码里都有注释

1 单选


public class SingleActivity extends AppCompatActivity {
 private ListView listView;
 private ArrayList<String> groups;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_single);
  listView = (ListView) this.findViewById(R.id.lvGroup);
  groups = new ArrayList<String>();
  groups.add("11");
  groups.add("22");
  groups.add("33");
  groups.add("44");
  groups.add("55");
  groups.add("66");
  groups.add("77");
  AdapterView.OnItemClickListener listItemClickListener = new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    // 取得ViewHolder对象，这样就省去了通过层层的findViewById去实例化我们需要的cb实例的步骤
    SingleAdapter.ViewHolder viewHolder = (SingleAdapter.ViewHolder) view.getTag();
    viewHolder.cb.toggle();// 把CheckBox的选中状态改为当前状态的反,gridview确保是单一选中
   }
  };
  SingleAdapter adapter = new SingleAdapter(this, groups);
  listView.setAdapter(adapter);
  listView.setOnItemClickListener(listItemClickListener);
 }
}

Adapter：


public class SingleAdapter extends BaseAdapter {
 private Activity activity;//上下文
 private ArrayList<String> list;
 private LayoutInflater inflater = null;//导入布局
 private int temp = -1;
 public SingleAdapter(Activity context, ArrayList<String> list) {
  this.activity = context;
  this.list = list;
  inflater = LayoutInflater.from(context);
 }
 @Override
 public int getCount() {
  return list.size();
 }
 @Override
 public Object getItem(int position) {
  return list.get(position);
 }
 @Override
 public long getItemId(int position) {
  return position;
 }
 //listview每显示一行数据,该函数就执行一次
 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder = null;
  if (convertView == null) {//当第一次加载ListView控件时 convertView为空
   convertView = inflater.inflate(R.layout.group_item_view, null);//所以当ListView控件没有滑动时都会执行这条语句
   holder = new ViewHolder();
   holder.tv = (TextView) convertView.findViewById(R.id.item_tv);
   holder.cb = (CheckBox) convertView.findViewById(R.id.item_cb);
   convertView.setTag(holder);//为view设置标签
  } else {//取出holder
   holder = (ViewHolder) convertView.getTag();
  }
  //设置list的textview显示
  holder.tv.setTextColor(Color.WHITE);
  holder.tv.setText(list.get(position));
  // 根据isSelected来设置checkbox的选中状况
  holder.cb.setId(position);//对checkbox的id进行重新设置为当前的position
  holder.cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
   @Override
   public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
    if (isChecked) {//实现checkbox的单选功能,同样适用于radiobutton
     if (temp != -1) {
      //找到上次点击的checkbox,并把它设置为false,对重新选择时可以将以前的关掉
      CheckBox tempCheckBox = (CheckBox) activity.findViewById(temp);
      if (tempCheckBox != null)
       tempCheckBox.setChecked(false);
     }
     temp = compoundButton.getId();//保存当前选中的checkbox的id值
    }
   }
  });
  if (position == temp)//比对position和当前的temp是否一致
   holder.cb.setChecked(true);
  else
   holder.cb.setChecked(false);
  return convertView;
 }
 public static class ViewHolder {
  TextView tv;
  CheckBox cb;
 }
}

多选：


public class MulActivity extends AppCompatActivity {
 private ListView listView;
 private ArrayList<String> groups;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_mul);
  listView = (ListView) this.findViewById(R.id.list);
  groups = new ArrayList<>();
  groups.add("11");
  groups.add("22");
  groups.add("33");
  groups.add("44");
  groups.add("55");
  groups.add("66");
  groups.add("77");
  AdapterView.OnItemClickListener listItemClickListener = new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> parent, View view, int position,
         long id) {
    // 取得ViewHolder对象，这样就省去了通过层层的findViewById去实例化我们需要的cb实例的步骤
    MulAdapter.ViewHolder viewHolder = (MulAdapter.ViewHolder) view.getTag();
    viewHolder.cb.toggle();// 把CheckBox的选中状态改为当前状态的反,gridview确保是单一选中
    MulAdapter.getIsSelected().put(position, viewHolder.cb.isChecked());//将CheckBox的选中状况记录下来
   }
  };
  MulAdapter adapter = new MulAdapter(this, groups);
  listView.setAdapter(adapter);
  listView.setOnItemClickListener(listItemClickListener);
 }
}

Adapter：


public class MulAdapter extends BaseAdapter {
 private Context context;//上下文
 private ArrayList<String> list;
 //控制CheckBox选中情况
 private static HashMap<Integer, Boolean> isSelected;
 private LayoutInflater inflater = null;//导入布局
 public MulAdapter(Context context, ArrayList<String> list) {
  this.context = context;
  this.list = list;
  inflater = LayoutInflater.from(context);
  isSelected = new HashMap<Integer, Boolean>();
  initData();
 }
 private void initData() {//初始化isSelected的数据
  for (int i = 0; i < list.size(); i++) {
   getIsSelected().put(i, false);
  }
 }
 @Override
 public int getCount() {
  return list.size();
 }
 @Override
 public Object getItem(int position) {
  return list.get(position);
 }
 @Override
 public long getItemId(int position) {
  return position;
 }
 //listview每显示一行数据,该函数就执行一次
 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder = null;
  if (convertView == null) {//当第一次加载ListView控件时 convertView为空
   convertView = inflater.inflate(R.layout.group_item_view, null);//所以当ListView控件没有滑动时都会执行这条语句
   holder = new ViewHolder();
   holder.tv = (TextView) convertView.findViewById(R.id.item_tv);
   holder.cb = (CheckBox) convertView.findViewById(R.id.item_cb);
   convertView.setTag(holder);//为view设置标签
  } else {//取出holder
   holder = (ViewHolder) convertView.getTag();//the Object stored in this view as a tag
  }
  //设置list的textview显示
  holder.tv.setTextColor(Color.WHITE);
  holder.tv.setText(list.get(position));
  // 根据isSelected来设置checkbox的选中状况
  holder.cb.setChecked(getIsSelected().get(position));
  return convertView;
 }
 public static class ViewHolder {
  TextView tv;
  CheckBox cb;
 }
 public static HashMap<Integer, Boolean> getIsSelected() {
  return isSelected;
 }
 public static void setIsSelected(HashMap<Integer, Boolean> isSelected) {
  MulAdapter.isSelected = isSelected;
 }
}