基于SimpleAdapter与BaseAdapter的不同ListView实现

可共用代码：

数据模型User.java

public class User {//模拟网络获取到的数据
    private int imageId;//用户头像
    private String name;//用户名
    private String instruction;//用户介绍

    public User(){}

    public User (int imageId,String name,String instruction){
        this.imageId= imageId;
        this.name = name;
        this.instruction = instruction;
    }

    public void setImageId(int imageId) {
        this.imageId = imageId;
    }

    public int getImageId() {
        return imageId;
    }

    public void setInstruction(String instruction) {
        this.instruction = instruction;
    }

    public String getInstruction() {
        return instruction;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

列表项list_item.xml布局文件

<?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:background="@drawable/list_circle"//给列表项设置圆角边框，具体实现在下面
    android:orientation="horizontal"
    android:padding="20dp">//分离各列表项（间距）
    <ImageView
        android:id="@+id/listitem_iv_head"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/listitem_tv_userName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/listitem_tv_userInstruction"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </LinearLayout>
</LinearLayout>

自定义列表项圆角边框（shape实现）

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="10dp" />
    <!--得设置solid填充色，将rectangle与周围颜色区分，否则没效果-->
    <solid android:color="@android:color/holo_red_dark"/>
    <stroke android:color="@android:color/darker_gray"/>

</shape>

二者区别：

BaseAdapter实现ListView

继承BaseAdapter:

public class UserAdapter extends BaseAdapter {

    private Context context;
    private List<User> userList;//放置数据模型User的ArrayList【好像ViewPager的PagerAdapter】

    private int itemId;//listView的Item布局id

    private LayoutInflater inflater;//将xml文件转换成View对象

    private ImageView userHead;//分别对应列表项的各控件
    private TextView userName;
    private TextView userInfo;

    public UserAdapter(Context context,List<User> list,int itemId){
        this.context = context;//需要一个context
        this.userList = list;
        this.itemId = itemId;
    }

    @Override
    public int getCount() {//数据总数
        return userList.size();
    }

    @Override
    public Object getItem(int position) {//索引值为position的数据
        return userList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);//inflater
        convertView = inflater.inflate(itemId,null);//将列表项item的xml布局转换成view对象

        userHead = (ImageView) convertView.findViewById(R.id.listitem_iv_head);
        userName = (TextView) convertView.findViewById(R.id.listitem_tv_userName);
        userInfo = (TextView) convertView.findViewById(R.id.listitem_tv_userInstruction);

        User user = userList.get(position);//将获取到的实例中的各数据项赋值给对应列表项的各控件
        userHead.setImageResource(user.getImageId());
        userName.setText(user.getName());
        userInfo.setText(user.getInstruction());

        return convertView;//返回转换而来的view对象
    }
}

MainActivity：

public class MainActivity extends AppCompatActivity {
    private ListView main_listView;
    private List<User> userList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        init();

        UserAdapter myAdapter = new UserAdapter(this,userList,R.layout.listiten);
        main_listView.setAdapter(myAdapter);

    }

    private void init() {
        main_listView = (ListView) findViewById(R.id.main_lv_listView);
        userList = new ArrayList<User>();

        User user1 = new User(R.mipmap.ic_launcher,"tangao","coder");//模拟数据
        User user2 = new User(R.mipmap.ic_launcher,"tom","project");
        User user3 = new User(R.mipmap.ic_launcher,"jerry","mouse");

        userList.add(user1);
        userList.add(user2);
        userList.add(user3);
    }
}

SimpleAdapter实现ListView

MainActivity：

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private User users[];
    private List<Map<String, Object>> slist = new ArrayList<Map<String, Object>>();

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
	init();
        for (int i = 0; i < users.length; i++) {
	    User user=users[i];
            Map<String, Object> map = new HashMap<String, Object>();//一个HashMap放置一条数据（包含多个数据项）
            map.put("userPic", R.mipmap.ic_launcher);
            map.put("userName", user.getUserName());
            map.put("userNum", user.getInstruction());
            slist.add(map);
        }

        ListAdapter listAdapter = new SimpleAdapter(this,//上下文，访问应用程序各资源的入口
                slist,//数据源，用Map做元素的Arraylist对象
                R.layout.listiten,//列表项布局文件
                //按"键"从List的HashMap中取出数据项放置在 下面的id对应的控件中
                new String[]{"userPic", "userName", "userNum"},//键的名称对应于上面HashMap的键
                new int[]{R.id.listitem_iv_head, R.id.listitem_tv_userName, R.id.listitem_tv_userInstruction}
        );
        listView = ((ListView) findViewById(R.id.main_lv_listView));
        listView.setAdapter(listAdapter);

//        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
//            @Override
//            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {//position表明点击哪一项
//
//            }
//        });
    }
    private void init() {

        User user1 = new User(R.mipmap.ic_launcher,"tangao","coder");//模拟数据
        User user2 = new User(R.mipmap.ic_launcher,"tom","project");
        User user3 = new User(R.mipmap.ic_launcher,"jerry","mouse");

        users = new User[]{user1,user2,user3};
    }
}

效果图（虽然很丑）：