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ImageSwitcher (图像切换器，显示图片)

2024-07-05 15:53:58   227人阅读

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>

 

 


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