自定义Adapter

--MainActivity代码

 package com.example.qqdemo;

 import java.util.ArrayList;
 import java.util.List;

 import android.os.Bundle;
 import android.app.Activity;
 import android.view.Gravity;
 import android.view.Menu;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.ListView;
 import android.widget.TextView;

 public class MainActivity extends Activity {

     private List<UserInfo> list = new ArrayList<UserInfo>();// 定义数据源
     private ListView mylistviwe;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         initlist();
         initview();
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

     private void initview() {
         mylistviwe = (ListView) findViewById(R.id.listview);
         mylistviwe.setAdapter(new Myadapter());//绑定适配器
     }

     /**
      * 2015-4-30 向数据源添加数据
      */
     private void initlist() {

         for (int i = 0; i < 20; i++) {
             UserInfo uif = new UserInfo();
             if (i % 2 == 0) {
                 uif.setImage(R.drawable.monkey );
                 uif.setMag("Hello");
                 uif.setFlag(true);
             } else {
                 uif.setImage(R.drawable.monkey1 );
                 uif.setMag("HI");
                 uif.setFlag(false);
             }
             list.add(uif);
         }

     }

     /**
      * 定义内部类 自定义适配器 实现数据绑定
      */

     private class Myadapter extends BaseAdapter {

         @Override
         public int getCount() {// 修改getCount()返回值为list的长度

             return list.size();// 返回数据的条数
         }

         @Override
         public Object getItem(int position) {// 修改getItem()list封装具体内容

             return list.get(position);// 获取item里面的内容
         }

         @Override
         public long getItemId(int position) { // 返回对应位置getItemId；
             // 返回对应位置getItemId；

             return position;// 返回item的位置
         }

         // 绑定数据getview->findviewbyid ->给控件添加数据
         @Override
         public View getView(int position, View convertView, ViewGroup parent) {

             // 手动生成View对象 查找XML中控件。
             // R.layout.item_xml-->找到XML控件
             // null-->是否把读取上来的view添加到容器当中
             View v = View.inflate(MainActivity.this, R.layout.item_xml, null);
             // 得到当先控件的ID
             ImageView leftimage = (ImageView) v.findViewById(R.id.leftimage);
             ImageView rigtimage = (ImageView) v.findViewById(R.id.rigtimage);
             TextView tvshow = (TextView) v.findViewById(R.id.mytextview);
             UserInfo muif = list.get(position);// 获取到item里面的内容

             // 将item添加到ListView中
             if (muif.isFlag()) {
                 rigtimage.setVisibility(View.GONE);
                 leftimage.setVisibility(View.VISIBLE);
                 leftimage.setImageResource(muif.getImage());
                 tvshow.setText(muif.getMag());
                 tvshow.setGravity(Gravity.LEFT);

             } else {
                 rigtimage.setVisibility(View.VISIBLE);
                 leftimage.setVisibility(View.GONE);
                 leftimage.setImageResource(muif.getImage());
                 tvsh

 ow.setText(muif.getMag());
                 tvshow.setGravity(Gravity.RIGHT);

             }
             return v;
         }

     }

 }

 1 package com.example.qqdemo;
 2 /**
 3  * 封装UserInfo对象
 4  * @author wenfei
 5  */
 6 public class UserInfo {
 7     private int image;
 8     private String mag;
 9     private boolean flag;
10
11
12     public int getImage() {
13         return image;
14     }
15     public void setImage(int image) {
16         this.image = image;
17     }
18     public String getMag() {
19         return mag;
20     }
21     public void setMag(String mag) {
22         this.mag = mag;
23     }
24     public boolean isFlag() {
25         return flag;
26     }
27     public void setFlag(boolean flag) {
28         this.flag = flag;
29     }
30
31
32 }

--XML文件

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".MainActivity" >

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

 </LinearLayout>

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
     tools:context=".MainActivity" >

     <RelativeLayout
         android:layout_width="match_parent"
         android:layout_height="50dp" >

         <ImageView
             android:id="@+id/leftimage"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_centerVertical="true"
             android:src="@drawable/monkey" />

         <TextView
             android:id="@+id/mytextview"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_centerVertical="true"
             android:layout_toLeftOf="@+id/rigtimage"
             android:layout_toRightOf="@+id/leftimage"
             android:gravity="right"
             android:text="我来了" />

         <ImageView
             android:id="@+id/rigtimage"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_alignParentRight="true"
             android:layout_centerVertical="true"
             android:src="@drawable/monkey1" />
     </RelativeLayout>

 </LinearLayout>