ImageSwitcher的功能和用法

先看看继承关系，ImageSwitcher和TextSwitcher的继承关系是一样的。两个重要的父类：ViewSwitcher和ViewAnimator
继承于ViewSwitcher，说明具备了切换功能
继承于ViewAnimator，说明具备了动画功能

重要方法

　　　　setImageURI(Uri uri)：设置图片地址

　　　　setImageResource(int resid)：设置图片资源库

　　　　setImageDrawable(Drawable drawable)：绘制图片

实例：

MainActivity.java

 1 public class MainActivity extends Activity {
 2     int[] image_ids = new int[] { R.drawable.focus_1, R.drawable.focus_2,
 3             R.drawable.focus_3, R.drawable.focus_4, R.drawable.focus_5,
 4             R.drawable.focus_7, R.drawable.focus_8, R.drawable.focus_9,
 5             R.drawable.focus_10, R.drawable.focus_11, R.drawable.focus_12,
 6             R.drawable.focus_13, R.drawable.focus_14, R.drawable.focus_15,
 7             R.drawable.focus_16 };
 8
 9     ImageSwitcher m_imageSwitcher;
10
11     @Override
12     protected void onCreate(Bundle savedInstanceState) {
13         super.onCreate(savedInstanceState);
14         setContentView(R.layout.activity_main);
15         // 创建list容器，包含的元素是Map
16         List<Map<String, Object>> listMaps = new ArrayList<Map<String, Object>>();
17         for (int i = 0; i < image_ids.length; i++) {
18             Map<String, Object> item = new HashMap<String, Object>();
19             item.put("image", image_ids[i]);
20             listMaps.add(item);
21         }
22         m_imageSwitcher = (ImageSwitcher) findViewById(R.id.imageswitcher_id);
23         // 为imageSwitcher设置动画效果
24         m_imageSwitcher.setFactory(new ViewFactory() {
25
26             @Override
27             public View makeView() {
28                 // 创建ImageView对象
29                 ImageView image = new ImageView(MainActivity.this);
30                 image.setScaleType(ImageView.ScaleType.FIT_CENTER);
31                 image.setLayoutParams(new ImageSwitcher.LayoutParams(
32                         LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
33                 return image;
34             }
35         });
36         // 创建一个simpleAdapter
37         SimpleAdapter simpleAdapter = new SimpleAdapter(this, listMaps,
38                 R.layout.cell, new String[] { "image" },
39                 new int[] { R.id.image1 });
40         GridView gridView = (GridView)findViewById(R.id.gridview_id);
41         gridView.setAdapter(simpleAdapter);
42         //常见列表被选中的监听器
43         gridView.setOnItemSelectedListener(new OnItemSelectedListener() {
44             @Override
45             public void onItemSelected(AdapterView<?> parent, View view,
46                     int position, long id) {
47                 //显示当前被选中的图片
48                 m_imageSwitcher.setImageResource(image_ids[position]);
49             }
50
51             @Override
52             public void onNothingSelected(AdapterView<?> parent) {
53
54             }
55         });
56         //添加列表项被单机的监听器
57         gridView.setOnItemClickListener(new OnItemClickListener() {
58
59             @Override
60             public void onItemClick(AdapterView<?> parent, View view,
61                     int position, long id) {
62                 // 显示被单机的列表项
63                 m_imageSwitcher.setImageResource(image_ids[position]);
64             }
65         });
66     }
67
68     @Override
69     public boolean onCreateOptionsMenu(Menu menu) {
70         // Inflate the menu; this adds items to the action bar if it is present.
71         getMenuInflater().inflate(R.menu.main, menu);
72         return true;
73     }
74
75     @Override
76     public boolean onOptionsItemSelected(MenuItem item) {
77         // Handle action bar item clicks here. The action bar will
78         // automatically handle clicks on the Home/Up button, so long
79         // as you specify a parent activity in AndroidManifest.xml.
80         int id = item.getItemId();
81         if (id == R.id.action_settings) {
82             return true;
83         }
84         return super.onOptionsItemSelected(item);
85     }
86 }

activity_main.xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent"
 5     android:gravity="center_horizontal"
 6     android:orientation="vertical"
 7     android:paddingBottom="@dimen/activity_vertical_margin"
 8     android:paddingLeft="@dimen/activity_horizontal_margin"
 9     android:paddingRight="@dimen/activity_horizontal_margin"
10     android:paddingTop="@dimen/activity_vertical_margin"
11     tools:context="com.crazy.gridview.MainActivity" >
12
13     <GridView
14         android:id="@+id/grid01"
15         android:layout_width="fill_parent"
16         android:layout_height="wrap_content"
17         android:gravity="center"
18         android:horizontalSpacing="1pt"
19         android:numColumns="4"
20         android:verticalSpacing="1pt" />
21
22     <ImageView
23         android:id="@+id/imageView"
24         android:layout_width="240dp"
25         android:layout_height="240dp"
26         android:layout_gravity="center_horizontal"
27         android:contentDescription="@string/string_yulan" />
28
29 </LinearLayout>

cell.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="horizontal"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     android:gravity="center_horizontal"
 7     android:padding="4pt"
 8     >
 9 <ImageView
10     android:id="@+id/image1"
11     android:layout_width="50dp"
12     android:layout_height="50dp"
13     android:contentDescription="@string/desc_image1"
14     />
15 </LinearLayout>

ImageSwitcher的功能和用法,布布扣,bubuko.com