Android listview与adapter用法(BaseAdapter + getView)

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Android listview与adapter用法
http://www.cnblogs.com/zhengbeibei/archive/2013/05/14/3078805.html

 

package com.example.listviewtest;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

//import com.example.listviewtest.MyAdapter;

public class BaseAdapterTest extends Activity {
    
    private ListView lv;
    ArrayList<HashMap<String, Object>> listItem;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        lv = (ListView) findViewById(R.id.listview01);
        
        MyAdapter mAdapter = new MyAdapter(this); //得到一个MyAdapter对象
        
        lv.setAdapter(mAdapter); //为ListView绑定Adapter 
        /*为ListView添加点击事件*/ 
        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                Log.v("BaseAdapterTest", "你点击了ListView条目" + position);
            }
        });
        
    }
    
    /*添加一个得到数据的方法,方便使用*/
    private ArrayList<HashMap<String, Object>> getData() {
        ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String,Object>>();
        
        /*为动态数组添加数据*/
        for (int i = 0; i < 30; i++) {
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("ItemTitle", "第" + i + "行");
            map.put("ItemText", "这是第" + i + "行");
            listItem.add(map);
        }
        
        return listItem;
    }
    
    // 新建一个类继承BaseAdapter,实现视图与数据的绑定
    private class MyAdapter extends BaseAdapter {
        
        private LayoutInflater mInflater; //得到一个LayoutInfalter对象用来导入布局
        
        public MyAdapter(Context context) {
            this.mInflater = LayoutInflater.from(context);
        }
        
        @Override
        public int getCount() {
            return getData().size(); //返回数组的长度
        }        
        
        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            Log.v("BaseAdapterTest", "getView " + position + " " + convertView);
            
            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.listitem, null);
                holder = new ViewHolder();
                /*得到各个控件的对象*/
                holder.title = (TextView) convertView.findViewById(R.id.ItemTitle);
                holder.text = (TextView) convertView.findViewById(R.id.ItemText);
                holder.bt = (Button) convertView.findViewById(R.id.ItemButton); // to ItemButton
                
                convertView.setTag(holder); //绑定ViewHolder对象
            }
            else {
                holder = (ViewHolder) convertView.getTag(); //取出ViewHolder对象
            }
            
            /*设置TextView显示的内容,即我们存放在动态数组中的数据*/
            holder.title.setText(getData().get(position).get("ItemTitle").toString());
            holder.text.setText(getData().get(position).get("ItemText").toString());
            /*为Button添加点击事件*/
            holder.bt.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.v("BaseAdapterTest", "你点击了按钮" + position);
                    //打印Button的点击信息
                }
            });
            
            return convertView;
        }
        
        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

    }
    
    /*存放控件 的ViewHolder*/
    public final class ViewHolder {
        public TextView title;
        public TextView text;
        public Button bt;
    }

}
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