Listveiw加checkbox

来源：互联网发布：java config 配置文件编辑：程序博客网时间：2024/06/04 18:12

GitHub博客：http://lioil.win/2016/04/20/ListView-CheckBox.html
Coding博客：http://c.lioil.win/2016/04/20/ListView-CheckBox.html

适配器在getview()中重复使用【被移除屏幕的item】
会造成被选中的checkbox重新出现，显示异常
故需要记录checkbox的状态

    <!--CheckBox抢占Item焦点，导致Item点击无效。    方法一：CheckBox设置android:clickable="false"     方法二：Item根布局设置android:descendantFocusability="blocksDescendants"-->    <LinearLayout            ·······        android:descendantFocusability="blocksDescendants"            ·······>        <CheckBox            ·······                        android:clickable="false"             ·······/>    </LinearLayout>

public class MyAdapter extends BaseAdapter {    public MyAdapter(···,HashMap<Integer, Boolean> isSelected){        ······    }    @Override      public View getView(int position, View convertView, ViewGroup arg2) {                      if (convertView == null) {              ViewHolder holder = new ViewHolder();              convertView = inflater.inflate(R.layout.listview, null);            holder.cb = (CheckBox) convertView.findViewById(R.id.item_cb);              convertView.setTag(holder);          } else {              holder = (ViewHolder) convertView.getTag();          }        // 显示checkbox的状态        holder.cb.setChecked(isSelected.get(position));        return view;      }  }

public class MainActivity extends Activity {    ······    // 记录checkbox状态    private HashMap<Integer, Boolean> isSelected    ······    // 初始化所有checkbox为未选择      isSelected = new HashMap<Integer, Boolean>();      for (int i = 0; i < list.size(); i++) {          isSelected.put(i, false);      }    ······      // 设置带checkbox的listview        listview.setAdapter(new MyAdapter(·····, isSelected));    listview.setOnItemClickListener(new OnItemClickListener() {         @Override          public void onItemClick(AdapterView<?> arg0, View view,                  int position, long arg3) {                      // 获取checkbox控件            ViewHolder holder = (ViewHolder) view.getTag();                 // 点击item切换checkbox状态            holder.cb.toggle();             // 记录checkbox状态            isSelected.put(position, holder.cb.isChecked());                                 }      });    //全选      xxx.setOnClickListener(new OnClickListener(){          @Override          public void onClick(View arg0) {            for(int i=0;i<list.size();i++){                  isSelected.put(i,true);            }            // 通知适配器checkbox状态改变            adapter.notifyDataSetChanged();                  }      });      //反选      xxx.setOnClickListener(new OnClickListener(){          @Override          public void onClick(View v) {              for(int i=0;i<list.size();i++){                  if(isSelected.get(i)==false){                      isSelected.put(i, true);                }                  else{                      isSelected.put(i, false);                }              }              adapter.notifyDataSetChanged();        }      });      //取消已选      xxx.setOnClickListener(new OnClickListener(){          @Override          public void onClick(View v) {              for(int i=0;i<list.size();i++){                  if(isSelected.get(i)==true){                      isSelected.put(i, false);                }             }              adapter.notifyDataSetChanged();        }      });}

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