android-gallery游览图片点击图片放大

 package com.hua.com;
 import android.app.Activity;
 import android.content.Context;
 import android.os.Bundle;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.Animation;
 import android.view.animation.AnimationSet;
 import android.view.animation.ScaleAnimation;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.AdapterView.OnItemSelectedListener;
 import android.widget.BaseAdapter;
 import android.widget.Gallery;
 import android.widget.ImageView;
 public class TestGalleryActivity extends Activity {
     private Gallery gallery;
     private AnimationSet manimationSet;
     private int[] imgs;
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         init();
     }
     private void init(){
         imgs=new int[]{R.drawable.a,R.drawable.c,R.drawable.d,R.drawable.y,R.drawable.f};
         gallery = (Gallery)findViewById(R.id.gy_main);
         ImageAdapter imgAdapter = new ImageAdapter(this,imgs);
         gallery.setAdapter(imgAdapter);
         gallery.setSelection(imgs.length/2);
         gallery.setOnItemClickListener(listener);

     }
     private OnItemClickListener listener = new  OnItemClickListener(){
         @Override
         public void onItemClick(AdapterView<?> parent, View view, int position,
                 long id) {
             if(position!=0&&position!=4){
                 AnimationSet animationSet = new AnimationSet(true);
                 if(manimationSet!=null&&manimationSet!=animationSet){
                      ScaleAnimation scaleAnimation = new ScaleAnimation(2,0.5f,2,0.5f,
                              Animation.RELATIVE_TO_SELF,0.5f,   //使用动画播放图片
                               Animation.RELATIVE_TO_SELF,0.5f);
                             scaleAnimation.setDuration(1000);
                             manimationSet.addAnimation(scaleAnimation);
                             manimationSet.setFillAfter(true); //让其保持动画结束时的状态。
                            view.startAnimation(manimationSet);
                 }
                      ScaleAnimation scaleAnimation = new ScaleAnimation(1,2f,1,2f,
                              Animation.RELATIVE_TO_SELF,0.5f,
                              Animation.RELATIVE_TO_SELF,0.5f);
                            scaleAnimation.setDuration(1000);
                            animationSet.addAnimation(scaleAnimation);
                            animationSet.setFillAfter(true);
                            view.startAnimation(animationSet);
                            manimationSet = animationSet;

                 }else{
                     if(null!=manimationSet)manimationSet.setFillAfter(false);
                 }
         }
     };
     class ImageAdapter extends BaseAdapter{
         private Context ct;
         private int[] data;
         public ImageAdapter(Context ct,int[] data){
             this.ct=ct;
             this.data=data;
         }
         @Override
         public int getCount() {
             return data.length;
         }
         @Override
         public Object getItem(int position) {
             return data[position];
         }
         @Override
         public long getItemId(int position) {
             return position;
         }
         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
             View view = null;
             if(convertView==null){
                 ImageView img = new ImageView(ct);
                 img.setImageResource(data[position]);
                 view=img;
             }else{
                 view=convertView;
             }
             return view;
         }
     }
 }

 view plainprint?
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
 <TextView
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="@string/hello"
     />
     <Gallery
     android:id="@+id/gy_main"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:layout_gravity="center_horizontal"
     android:spacing="10dip"
     android:layout_centerHorizontal="true"


     />
 </LinearLayout>