android 改变listview中checkbox的状态

项目要用到一个listview，要求是可以显示图片，后面还有有复选框。

先新建一个MyAdapter类，继承自BaseAdapter。在MyAdapter中实现对数据的绑定，我这儿由于是测试的，所以把数据写死了。

Java代码

    package com.zwq.umeng;

    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;

    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.CheckBox;
    import android.widget.ImageView;
    import android.widget.TextView;

    public class MyAdapter extends BaseAdapter {
        private LayoutInflater mInflater;
        private List<Map<String, Object>> mData;
        public static Map<Integer, Boolean> isSelected;

        public MyAdapter(Context context) {
            mInflater = LayoutInflater.from(context);
            init();
        }

        //初始化
        private void init() {
            mData=new ArrayList<Map<String, Object>>();
            for (int i = 0; i < 5; i++) {
                Map<String, Object> map = new HashMap<String, Object>();
                map.put("img", R.drawable.icon);
                map.put("title", "第" + (i + 1) + "行的标题");
                mData.add(map);
            }
            //这儿定义isSelected这个map是记录每个listitem的状态，初始状态全部为false。
            isSelected = new HashMap<Integer, Boolean>();
            for (int i = 0; i < mData.size(); i++) {
                isSelected.put(i, false);
            }
        }

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

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

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            //convertView为null的时候初始化convertView。
            if (convertView == null) {
                holder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.vlist, null);
                holder.img = (ImageView) convertView.findViewById(R.id.img);
                holder.title = (TextView) convertView.findViewById(R.id.title);
                holder.cBox = (CheckBox) convertView.findViewById(R.id.cb);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            holder.img.setBackgroundResource((Integer) mData.get(position).get(
                    "img"));
            holder.title.setText(mData.get(position).get("title").toString());
            holder.cBox.setChecked(isSelected.get(position));
            return convertView;
        }

        public final class ViewHolder {
            public ImageView img;
            public TextView title;
            public CheckBox cBox;
        }
    }

上面类中要注意getView()方法中对数据的处理。

接下要新建一个list.xml文件，这个就是布局image、textview、checkbox。

Java代码

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:andro+vHollder.title.getText());
                    }
                }
            }
        };

OnItemClickListener itemListener = new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> l, View v, int position, long id) {

     LinearLayout view1 = (LinearLayout) l.getChildAt(position);
     RelativeLayout view = (RelativeLayout) view1.getChildAt(0);
     CheckBox box = (CheckBox) view.getChildAt(2);
     box.setChecked(!box.isChecked());

}
}
};

注解：onItemClick中的参数

AdapterView<?> l 代表 ListView 中每项锁用的Layouyt

int position 代表当前点击的Item 在 List中index