（简单图片浏览器）imageSwitcher与gallery结合应用

本文主要是介绍（简单图片浏览器）imageSwitcher与gallery结合应用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！

上次讲了如何使用Gallery控件，这次就讲Gallery 与ImageSwitcher的结合使用，本文实现一个简单的浏览图片的功能。先贴出程序运行截图：

除了Gallery可以拖拉切换图片，我在ImageSwitcher控件加入了setOnTouchListener事件实现，使得ImageSwitcher也可以在拖拉中切换图片。本例子依然使用JAVA的反射机制来自动读取资源中的图片。

main.xml的源码如下:

程序的源码如下:

 view plain copy to clipboard print ? 
 package com.testImageView;  
 import java.lang.reflect.Field;  
 import java.util.ArrayList;  
 import android.app.Activity;  
 import android.content.Context;  
 import android.os.Bundle;  
 import android.view.MotionEvent;  
 import android.view.View;  
 import android.view.View.OnTouchListener;  
 import android.view.ViewGroup;  
 import android.view.animation.AnimationUtils;  
 import android.widget.AdapterView;  
 import android.widget.BaseAdapter;  
 import android.widget.Gallery;  
 import android.widget.ImageSwitcher;  
 import android.widget.ImageView;  
 import android.widget.AdapterView.OnItemSelectedListener;  
 import android.widget.Gallery.LayoutParams;  
 import android.widget.ViewSwitcher.ViewFactory;  
 public class testImageView extends Activity implements ViewFactory {  
     private ImageSwitcher is;  
     private Gallery gallery;  
     private int downX,upX;  
     private ArrayList<Integer> imgList=new ArrayList<Integer>();//图像ID  
       
     @Override  
     protected void onCreate(Bundle savedInstanceState) {  
         // TODO Auto-generated method stub  
         super.onCreate(savedInstanceState);  
         setContentView(R.layout.main);  
         //用反射机制来获取资源中的图片ID  
         Field[] fields = R.drawable.class.getDeclaredFields();  
         for (Field field : fields)  
         {  
             if (!"icon".equals(field.getName()))//除了icon之外的图片  
             {     
                 int index = 0;  
                 try {  
                     index = field.getInt(R.drawable.class);  
                 } catch (IllegalArgumentException e) {  
                     // TODO Auto-generated catch block  
                     e.printStackTrace();  
                 } catch (IllegalAccessException e) {  
                     // TODO Auto-generated catch block  
                     e.printStackTrace();  
                 }  
                 //保存图片ID  
                 imgList.add(index);  
             }  
         }  
           
         //设置ImageSwitcher控件  
         is = (ImageSwitcher) findViewById(R.id.switcher);  
         is.setFactory(this);  
         is.setInAnimation(AnimationUtils.loadAnimation(this,  
                 android.R.anim.fade_in));  
         is.setOutAnimation(AnimationUtils.loadAnimation(this,  
                 android.R.anim.fade_out));  
         is.setOnTouchListener(new OnTouchListener(){  
             /* 
              * 在ImageSwitcher控件上滑动可以切换图片 
              */  
             @Override  
             public boolean onTouch(View v, MotionEvent event) {  
                 if(event.getAction()==MotionEvent.ACTION_DOWN)  
                 {  
                     downX=(int) event.getX();//取得按下时的坐标  
                     return true;  
                 }  
                 else if(event.getAction()==MotionEvent.ACTION_UP)  
                 {  
                     upX=(int) event.getX();//取得松开时的坐标  
                     int index=0;  
                     if(upX-downX>100)//从左拖到右，即看前一张  
                     {  
                         //如果是第一，则去到尾部  
                         if(gallery.getSelectedItemPosition()==0)  
                            index=gallery.getCount()-1;  
                         else  
                             index=gallery.getSelectedItemPosition()-1;  
                     }  
                     else if(downX-upX>100)//从右拖到左，即看后一张  
                     {  
                         //如果是最后，则去到第一  
                         if(gallery.getSelectedItemPosition()==(gallery.getCount()-1))  
                             index=0;  
                         else  
                             index=gallery.getSelectedItemPosition()+1;  
                     }  
                     //改变gallery图片所选，自动触发ImageSwitcher的setOnItemSelectedListener  
                     gallery.setSelection(index, true);  
                     return true;  
                 }  
                 return false;  
             }  
               
         });  
           
         //设置gallery控件  
         gallery = (Gallery) findViewById(R.id.gallery);  
         gallery.setAdapter(new ImageAdapter(this));  
         gallery.setOnItemSelectedListener(new OnItemSelectedListener(){  
             @Override  
             public void onItemSelected(AdapterView<?> arg0, View arg1,  
                     int position, long arg3) {  
                 is.setImageResource(imgList.get(position));  
             }  
             @Override  
             public void onNothingSelected(AdapterView<?> arg0) {  
                 // TODO Auto-generated method stub  
             }  
               
         });  
     }  
     //设置ImgaeSwitcher  
     @Override  
     public View makeView() {  
         ImageView i = new ImageView(this);  
         i.setBackgroundColor(0xFF000000);  
         i.setScaleType(ImageView.ScaleType.CENTER);//居中  
         i.setLayoutParams(new ImageSwitcher.LayoutParams(//自适应图片大小  
                 LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));  
         return i;  
     }  
     public class ImageAdapter extends BaseAdapter {  
         public ImageAdapter(Context c) {  
             mContext = c;  
         }  
         public int getCount() {  
             return imgList.size();  
         }  
         public Object getItem(int position) {  
             return position;  
         }  
         public long getItemId(int position) {  
             return position;  
         }  
         public View getView(int position, View convertView, ViewGroup parent) {  
             ImageView i = new ImageView(mContext);  
             i.setImageResource(imgList.get(position));  
             i.setAdjustViewBounds(true);  
             i.setLayoutParams(new Gallery.LayoutParams(  
                     LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));  
             return i;  
         }  
         private Context mContext;  
     }  
   
 }  

 view plain copy to clipboard print ? 
 <?xml version="1.0" encoding="utf-8"?>  
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"   
     android:layout_width="match_parent"   
     android:layout_height="match_parent">   
       
     <ImageSwitcher android:id="@+id/switcher"  
         android:layout_width="match_parent" android:layout_height="match_parent"/>  
       
     <Gallery android:id="@+id/gallery"  
         android:background="#55000000"  
         android:layout_width="match_parent"  
         android:layout_alignParentBottom="true"  
         android:layout_alignParentLeft="true"  
           
         android:gravity="center_vertical"  
         android:spacing="16dp" android:layout_height="100dp"/>  
 </RelativeLayout>  
      