ImageSwitcher (图像切换器，显示图片)

ImageSwitcher继承了ViewSwitcher，主要在切换图片时加入动画效果

使用方法：

　　　　1.为ImageSwitcher提供一个ViewFactory,该ViewFactory生成的View组件必须是ImageView

　　　　2.切换图片时，用到的3个方法：imageSwitcher.setImageDrawable(Drawable drawable);

　　　　　　　　　　　　　　　　　　  imageSwitcher.setImageResource(int resid);

　　　　　　　　　　　　　　　　　　  imageSwitcher.setImageURI(URI uri);

1.java代码：

  1 package gdp.switcherview2;

  2

  3 import java.util.ArrayList;

  4 import java.util.HashMap;

  5 import java.util.List;

  6 import java.util.Map;

  7

  8 import android.app.Activity;

  9 import android.os.Bundle;

 10 import android.view.Menu;

 11 import android.view.View;

 12 import android.view.ViewGroup.LayoutParams;

 13 import android.widget.AdapterView;

 14 import android.widget.AdapterView.OnItemClickListener;

 15 import android.widget.AdapterView.OnItemSelectedListener;

 16 import android.widget.GridView;

 17 import android.widget.ImageSwitcher;

 18 import android.widget.ImageView;

 19 import android.widget.SimpleAdapter;

 20 import android.widget.Toast;

 21 import android.widget.ViewSwitcher.ViewFactory;

 22

 23 public class MainActivity extends Activity {

 24     //声明一个数组，用来装载图片资源

 25     int[] imageIds = new int[]{R.drawable.baiyang, R.drawable.chunv, R.drawable.jinniu, R.drawable.juxie,

 26                             R.drawable.mojie, R.drawable.sheshou, R.drawable.shizi, R.drawable.shuangyu,

 27                             R.drawable.shuangzi, R.drawable.shuiping, R.drawable.tiancheng, R.drawable.tianxie};

 28     //声明ImageSwitcher对象

 29     private ImageSwitcher switcher ;

 30     @Override

 31     protected void onCreate(Bundle savedInstanceState) {

 32         super.onCreate(savedInstanceState);

 33         setContentView(R.layout.main);

 34

 35         //创建一个List对象，其元素Map

 36         List<Map<String, Object>> listItems = new ArrayList<Map<String,Object>>();

 37         for(int i = 0; i<imageIds.length; i++){

 38             Map<String, Object> listItem = new HashMap<String, Object>();

 39             listItem.put("image", imageIds[i]);

 40             listItems.add(listItem);

 41         }

 42

 43         //获取显示图片的ImageSwitcher

 44         switcher = (ImageSwitcher)findViewById(R.id.switcher);

 45         //为imageSwicher设置图片切换的动画效果

 46         switcher.setFactory(new ViewFactory() {

 47

 48             @Override

 49             public View makeView() {

 50                 // 创建imageView对象

 51                 ImageView imageView = new ImageView(MainActivity.this);

 52                 imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);

 53                 imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.WRAP_CONTENT,

 54                                         LayoutParams.WRAP_CONTENT));

 55                 //返回ImageView对象

 56                 return imageView;

 57             }

 58         });

 59         //创建Adapter

 60         SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems, R.layout.cell, new String[]{"image"}, new int[]{R.id.image1});

 61         GridView grid = (GridView)findViewById(R.id.grid01);

 62         grid.setAdapter(simpleAdapter);

 63         //添加列表项被点击的监听器

 64         grid.setOnItemClickListener(new ItemClick());

 65         //添加列表项被选中的监听器

 66         grid.setOnItemSelectedListener(new ItemSelect());

 67     }

 68

 69     class ItemClick implements OnItemClickListener{

 70

 71         @Override

 72         public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

 73                 long arg3) {

 74             // TODO Auto-generated method stub

 75             switcher.setImageResource(imageIds[arg2]);

 76         }

 77

 78     }

 79

 80     class ItemSelect implements OnItemSelectedListener{

 81

 82         @Override

 83         public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,

 84                 long arg3) {

 85             // TODO Auto-generated method stub

 86             switcher.setImageResource(imageIds[arg2]);

 87         }

 88

 89         @Override

 90         public void onNothingSelected(AdapterView<?> arg0) {

 91             // TODO Auto-generated method stub

 92             Toast.makeText(MainActivity.this, "Nothing Selected" , Toast.LENGTH_LONG).show();

 93         }

 94

 95     }

 96

 97     @Override

 98     public boolean onCreateOptionsMenu(Menu menu) {

 99         // Inflate the menu; this adds items to the action bar if it is present.

100         getMenuInflater().inflate(R.menu.main, menu);

101         return true;

102     }

103

104 }

2.xml文件

main.xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 2     android:layout_width="fill_parent"

 3     android:layout_height="fill_parent"

 4     android:orientation="vertical"

 5     android:gravity="center_horizontal" >

 6     <!-- 定义一个GridView组件 -->

 7     <GridView

 8         android:id="@+id/grid01"

 9         android:layout_width="fill_parent"

10         android:layout_height="wrap_content"

11         android:horizontalSpacing="2dp"

12         android:verticalSpacing="2dp"

13         android:numColumns="4"

14         android:gravity="center"

15         />

16     <!-- 定义一个ImageSwitcher组件 -->

17     <ImageSwitcher

18         android:id="@+id/switcher"

19         android:layout_width="300dp"

20         android:layout_height="300dp"

21         android:layout_gravity="center_horizontal"

22         android:inAnimation="@android:anim/fade_in"

23         android:outAnimation="@android:anim/fade_out"

24         />

25 </LinearLayout>

cell.xml

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 2     android:layout_width="fill_parent"

 3     android:layout_height="fill_parent"

 4     android:orientation="vertical" >

 5     <ImageView

 6         android:id="@+id/image1"

 7         android:layout_width="fill_parent"

 8         android:layout_height="fill_parent"

 9         android:scaleType="fitXY"

10         />

11 </LinearLayout>

ImageSwitcher (图像切换器，显示图片)