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）：