AndroidのListView包含CheckBox时滑动丢失选中状态的解决

AndroidのListView包含CheckBox时滑动丢失选中状态的解决

listview 中，如果有10项，其中手机屏幕显示1-6项，其余的7-10项在屏幕中不可见，得向下滚动后才能看到，这个时候，如果选中1、2项，再滚动到7-10项，之后再滚动回来1-6项，就发现1、2项并未被选中。

解决方法: 编写自定义的Adapter，一下是代码部分。、

class ListviewAdapter extends BaseAdapter {
        private ArrayList<Appinfo> lists;
        private ViewHolder viewHolder;
        private HashMap<Integer, Boolean> map;

        public ListviewAdapter(ArrayList<Appinfo> list) {
            lists = list;
            map = new HashMap<Integer, Boolean>();
            for (int i = 0; i < lists.size(); i++) {
                map.put(i, false);
            }
        }

        @Override
        public int getCount() {
            return lists.size();
        }

        @Override
        public Object getItem(int arg0) {
            return null;
        }

        @Override
        public long getItemId(int arg0) {
            return 0;
        }

        @SuppressLint("NewApi")
        @Override
        public View getView(final int position, View convertView, ViewGroup arg2) {
            final Appinfo appUnit = lists.get(position);
            if (convertView == null) {
                viewHolder = new ViewHolder();
                convertView = LayoutInflater.from(SettingAppActivity.this)
                        .inflate(R.layout.news_list_item, null);
                viewHolder.item_new = (TextView) convertView
                        .findViewById(R.id.appName);
                viewHolder.item_pic = (ImageView) convertView
                        .findViewById(R.id.icon);
                viewHolder.item_check = (CheckBox) convertView
                        .findViewById(R.id.appcheck);
                convertView.setTag(viewHolder);
            } else {
                viewHolder = (ViewHolder) convertView.getTag();
            }
            viewHolder.item_new.setText(appUnit.getAppName());
            viewHolder.item_pic.setBackground(appUnit.getAppIcon());

            viewHolder.item_check
                    .setOnCheckedChangeListener(new OnCheckedChangeListener() {

                        @Override
                        public void onCheckedChanged(CompoundButton arg0,
                                boolean checked) {
                            Toast.makeText(SettingAppActivity.this,
                                    "checked=" + checked, 1000).show();
                            if (checked) {
                                map.put(position, true);
                            } else {
                                map.put(position, false);
                            }
                        }
                    });
            viewHolder.item_check.setChecked(map.get(position));
            return convertView;
        }
    }

    public class ViewHolder {
        public ImageView item_pic;
        public TextView item_new;
        public CheckBox item_check;
    }

是因为index错误造成的,那么只要保证index值与当前positon保持一至即可,只要把添加监听器的方法加到初始化view中checkBox状态的代码之前即可.这样即始由于初始化造成调用了onCheckedChange()方法，也因为其中index值是最新的,不会错乱.