监听ListView点击和滚动事件

package com.example.imooc_listview;

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

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemClickListener,
        OnScrollListener {

    private ListView listView;
    private ArrayAdapter<String> arr_adapter;
    private SimpleAdapter simp_adapter;
    private List<Map<String, Object>> dataList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        listView = (ListView) findViewById(R.id.listView);
        dataList = new ArrayList<Map<String, Object>>();
        /*
         * 1.新建一个适配器 ArrayAdapter(上下文，当前ListView加载的每一个列表所对应的布局文件，数据源) 2.适配器加载数据源
         * 3.视图（ListView）加载适配器
         */
        String[] arr_data = { "慕课网1", "慕课网2", "慕课网3", "慕课网4", "慕课网5", "慕课网6" };
        arr_adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, arr_data);

        /*
         * context:上下文 data: 数据源（List> data）
         * 一个Map所组成的List集合 每一个Map都会去对应ListView列表中的一行
         * 每一个Map（键-值对）中的键必须包含所有在from中所指定的键 resource:列表中的布局文件ID from:Map中的键名
         * to：绑定数据视图中的ID，与from成对应关系
         */
        simp_adapter = new SimpleAdapter(this, getData(), R.layout.item,
                new String[] { "pic", "text" }, new int[] { R.id.id_pic,
                        R.id.id_text });
        // listView.setAdapter(arr_adapter);
        listView.setAdapter(simp_adapter);
        listView.setOnItemClickListener(this);
        listView.setOnScrollListener(this);
    }

    private List<Map<String, Object>> getData() {
        for (int i = 0; i < 50; i++) {
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("pic", R.drawable.ic_launcher);
            map.put("text", "慕课网" + i);
            dataList.add(map);
        }
        return dataList;
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        switch (scrollState) {
        case SCROLL_STATE_FLING:
            Log.i("Main", "用户在手指离开屏幕之前，由于用力滑了一下，视图仍然由于惯性继续滑动。");
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("pic", R.drawable.ic_launcher);
            map.put("text", "增加项");
            dataList.add(map);
            simp_adapter.notifyDataSetChanged();
            break;
        case SCROLL_STATE_IDLE:
            Log.i("Main", "视图已经停止滑动。");
            break;
        case SCROLL_STATE_TOUCH_SCROLL:
            Log.i("Main", "手指没有离开屏幕，视图正在滑动。");
            break;
        default:
            break;
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        String text = listView.getItemAtPosition(position) + "";
        Toast.makeText(this, "position=" + position + " text=" + text,
                Toast.LENGTH_SHORT).show();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/id_pic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/id_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="demo"
        android:textColor="#000000"
        android:textSize="20sp" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>