模拟新浪微博随便看看栏目

使用ListView来模仿微博随便看看栏

【分析】

要完成这个效果，我们需要：

1.ListView及ListView_Item

2.实体类的编写

3.自定义适配器的书写

4.ListView的绑定数据源与控件

【编码】

package cn.edu.bzu.adapter;
 
import java.util.List;
 
import cn.edu.bzu.entity.Information;
import cn.edu.bzu.weibo.R;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
 
/**
 * 自定义Adapter实现listView的显示
 * @author monster
 * @date : 2015-04-28
 */
public class MyAdapter extends BaseAdapter {
    private List<Information> list;
    private Context mContext;
    private LayoutInflater mInflater;
    //定义构造方法
    public MyAdapter(List<Information> list, Context mContext) {
        super();
        this.list = list;
        this.mContext = mContext;
    }
 
    @Override
    public int getCount() {
        return list.size();
    }
 
    @Override
    public Object getItem(int position) {
        return list.get(position);
    }
 
    @Override
    public long getItemId(int position) {
        return position;
    }
 
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder=null;
        if(convertView==null){
            convertView=mInflater.from(mContext).inflate(R.layout.listview_item,null);  //布局转换成视图
            holder=new ViewHolder();
            //实例化控件
            holder.Image=(ImageView)convertView.findViewById(R.id.Iv);
            holder.Name=(TextView)convertView.findViewById(R.id.Name);
            holder.Time=(TextView)convertView.findViewById(R.id.Time);
            holder.Contents=(TextView)convertView.findViewById(R.id.Contents);
            convertView.setTag(holder); //设置setTag使得程序得以优化
        }else{
            holder=(ViewHolder) convertView.getTag();
        }
        //给控件赋值
        holder.Image.setBackgroundResource(list.get(position).getImgId());
        holder.Name.setText(list.get(position).getName());
        holder.Time.setText(list.get(position).getDate());
        holder.Contents.setText(list.get(position).getContent());
        return convertView;
    }
     
    class ViewHolder{
        ImageView Image;
        TextView  Name;
        TextView  Time;
        TextView  Contents;
    }
}

MainActivity：

package cn.edu.bzu.weibo;

import java.util.ArrayList;

import java.util.List;

import cn.edu.bzu.adapter.MyAdapter;

import cn.edu.bzu.entity.Information;

import android.os.Bundle;

import android.widget.ListView;

import android.app.Activity;

public class MainActivity extends Activity {

    private ListView listView;

    private MyAdapter adapter;

    private List<Information> list;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        setData();//数据源

         initView();

    }

    private void initView() {

        // 初始化控件

        listView=(ListView) findViewById(R.id.Lv);

        listView.setAdapter(adapter);  //绑定适配器

    }

    private void setData() {

        // 设置数据源

         list=new ArrayList<Information>();

        list.add(new Information(R.drawable.img1,"孙浩","2015-05-02","好好学习"));

        list.add(new Information(R.drawable.img2, "华华", "2015-05-02", "天天向上"));

        list.add(new Information(R.drawable.img3,"天天","2015-05-02","五一来了呀"));

        list.add(new Information(R.drawable.img4,"小云","2015-05-02","五一放假啦"));

        list.add(new Information(R.drawable.img5,"小雨","2015-05-02","开学开学了"));

        list.add(new Information(R.drawable.img6, "小张", "2015-05-02", "啦啦啦"));

        list.add(new Information(R.drawable.img7, "小新", "2015-05-02", "今天和闺蜜去超市，买了好多好多好吃的##"));

        adapter=new MyAdapter(list, MainActivity.this);

    }          

}

----->>这次实验让我掌握了ListView 控件的使用，理解了 Adapter 的作用并掌握自定义 FruitAdapter 的使用方式