android组件ListView之SimpleAdapter简单使用_android simpleadapter listview

SimpleAdapter

java.lang.Object
↳ android.widget.BaseAdapter
↳ android.widget.SimpleAdapter
ArrayAdapter只能适配简单的数据，而SimpleAdapter相对来说可以丰富列表项的内容，比如我们常见的QQ，微信，新闻列表。

SimpleAdapter 只有一个构造函数

SimpleAdapter(Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to)
1

从构造函数的参数可以初步理解下参数的意思，data数据、resource列表项的文件、from展示的数据、to数据展示的地方。下面代码中详细说明各个参数的作用。

Activity类

public class MainActivity extends Activity {
    private ListView listView;
    private List<Map<String, Object>> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.lv);
        initDataList();
        // key值数组，适配器通过key值取value，与列表项组件一一对应
        String[] from = { "img", "title", "content", "date" };
        // 列表项组件Id 数组
        int[] to = { R.id.item_img, R.id.item_title, R.id.item_content,
                R.id.item_date };
        /**
         * SimpleAdapter(Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to) 
         * context：activity界面类 
         * data 数组内容是map的集合数据
         * resource 列表项文件 
         * from map key值数组
         * to 列表项组件id数组      from与to一一对应，适配器绑定数据
         */
        final SimpleAdapter adapter = new SimpleAdapter(this, list,
                R.layout.listview_item, from, to);

        listView.setAdapter(adapter);
        /**
         * 单击
         */
        listView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                Map<String, Object> map = list.get(arg2);
                String str = "";
                str += map.get("title") + "---" + map.get("content") + "\n"
                        + "长按删除！";
                Toast.makeText(MainActivity.this, str, Toast.LENGTH_SHORT)
                        .show();

            }
        });
        /**
         * 长按
         */
        listView.setOnItemLongClickListener(new OnItemLongClickListener() {

            @Override
            public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                list.remove(arg2);
                adapter.notifyDataSetChanged();// 更新列表数据
                Toast.makeText(MainActivity.this, "删除成功！", Toast.LENGTH_SHORT)
                        .show();
                return false;
            }
        });

    }

    /**
     * 初始化适配器需要的数据格式
     */
    private void initDataList() {
        //图片资源
        int img[] = { R.drawable.i1, R.drawable.i2, R.drawable.i3,
                R.drawable.i4, R.drawable.i5, R.drawable.i6, R.drawable.i7,
                R.drawable.i8, R.drawable.i9, R.drawable.i10 };
        list = new ArrayList<Map<String, Object>>();
        for (int i = 0; i < 10; i++) {
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("img", img[i]);
            map.put("title", "android" + i);
            map.put("content", "SimpleAdapter" + i);
            map.put("date",
                    new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
            list.add(map);
        }

    }

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83

主界面activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.l6.MainActivity"
    android:orientation="vertical">
    <ListView 
        android:id="@+id/lv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        >


    </ListView>

</LinearLayout>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

列表项文件listview_item.xml

<RelativeLayout 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" >

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

        <ImageView
            android:id="@+id/item_img"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:src="@drawable/ic_launcher" />

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

            <TextView
                android:id="@+id/item_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="标题"
                android:textColor="#F00"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/item_content"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="内容"
                android:textColor="#000"
                android:textSize="16sp" />
        </LinearLayout>
    </LinearLayout>

    <TextView
        android:id="@+id/item_date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:text="时间"
        android:textColor="#0FF"
        android:textSize="16sp" />

</RelativeLayout>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

效果