Android 之 ListView使用BaseAdapter展示列表

simpleitem.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_weight="2" />

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="left"
        android:layout_weight="10"/>

    <TextView
        android:id="@+id/age"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_weight="3"/>

</LinearLayout>

BaseAdapterDemo.java

package com.example.phonedemo;

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

import com.example.phonedemo.util.Utils;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class BaseAdapterDemo extends Activity {

	private ListView listView = null;
	private LinearLayout layout = null;
	private MyBaseAdapter adapter = null;

	/**
	 * 功能：静态类，优化list
	 * 
	 * @author qinxijuan
	 * 
	 */
	static class ViewHolder {
		TextView id = null;
		TextView name = null;
		TextView age = null;
	}

	class MyBaseAdapter extends BaseAdapter {

		public List<Map<String, Object>> list = null;
		private LayoutInflater lif = null;

		public MyBaseAdapter(List<Map<String, Object>> l, Context context) {
			this.list = l;
			this.lif = LayoutInflater.from(context);
		}

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return this.list.size();
		}

		@Override
		public Object getItem(int arg0) {
			// TODO Auto-generated method stub
			return null;
		}

		@Override
		public long getItemId(int arg0) {
			// TODO Auto-generated method stub
			return 0;
		}

		@Override
		public View getView(int postion, View convertView, ViewGroup parent) {
			ViewHolder holder = null;
			if (convertView == null) {
				holder = new ViewHolder();
				convertView = lif.inflate(R.layout.simpleitem, null);
				holder.id = (TextView) convertView.findViewById(R.id.id);
				holder.name = (TextView) convertView.findViewById(R.id.name);
				holder.age = (TextView) convertView.findViewById(R.id.age);
				convertView.setTag(holder);
			} else {
				holder = (ViewHolder) convertView.getTag();
			}
			holder.id.setText(this.list.get(postion).get("id").toString());
			holder.name.setText(this.list.get(postion).get("name").toString());
			holder.age.setText(this.list.get(postion).get("age").toString());
			return convertView;
		}

	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		this.layout = new LinearLayout(this);
		this.layout.setOrientation(LinearLayout.VERTICAL);
		this.listView = new ListView(this);
		this.adapter = new MyBaseAdapter(initList(), this);
		this.listView.setAdapter(this.adapter);
		this.listView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1,
					int position, long arg3) {
				// TODO Auto-generated method stub
				Toast.makeText(
						BaseAdapterDemo.this,
						"您选择了："
								+ BaseAdapterDemo.this.adapter.list
										.get(position).get("id").toString(),
						Toast.LENGTH_SHORT).show();
			}
		});
		this.layout.addView(this.listView, Utils.match);
		super.addContentView(this.layout, Utils.match);
	}

	private List<Map<String, Object>> initList() {
		List<Map<String, Object>> temp = new ArrayList<Map<String, Object>>();
		Map<String, Object> map = null;
		for (int i = 0; i < 20; i++) {
			map = new HashMap<String, Object>();
			map.put("id", i);
			map.put("name", "张三" + i + "号");
			map.put("age", 28);
			map.put("email", "[email protected]");
			temp.add(map);
		}
		return temp;
	}

}