Android实现图片滚动效果

package com.example.gallary;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
 public class ImageAdapter extends BaseAdapter { 
 private Context mContext; // 图片数组源
 private Integer[] imgs = { R.drawable.img1, R.drawable.img2, R.drawable.img3, R.drawable.img4, R.drawable.img5, R.drawable.img6, R.drawable.img7};
 public ImageAdapter(Context c) { mContext = c; } 
 @Override 
 public int getCount() { return imgs.length; } // 获取图片位置
 @Override 
 public Object getItem(int position) { return imgs[position]; } // 获取图片ID 
 @Override 
 public long getItemId(int position) { return position; } 
 @Override 
 public View getView(int position, View convertView, ViewGroup parent) { 
 ImageView imageview = new ImageView(mContext); 
 imageview.setImageResource(imgs[position]); 
 imageview.setLayoutParams(new Gallery.LayoutParams(240, 200)); // 设置布局 图片120×120显示 
 imageview.setScaleType(ImageView.ScaleType.CENTER); // 设置显示比例类型（不缩放） 
 return imageview; }
 }

package com.example.gallary;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Gallery;
import android.widget.Toast;
 public class MainActivity extends Activity { 
 @Override public void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 Gallery gallery = (Gallery) findViewById(R.id.gallery); 
 gallery.setAdapter(new ImageAdapter(this)); // gallery添加ImageAdapter图片资源 
 
 } 
 
 }

<TextView   
 android:id="@+id/tv"  
 android:layout_width="fill_parent"  
 android:layout_height="wrap_content"  
 android:gravity="center"      
 android:layout_gravity="center"     
 android:layout_marginTop="50dip"  
 android:textColor="#ffff0000"  
 android:textSize="30sp"  
 android:text="滚动图片"/>  
<Gallery  
 android:id="@+id/gallery" 
 android:layout_width="fill_parent" 
 android:layout_height="wrap_content" 
 android:layout_marginTop="10dip" 
 android:layout_below="@id/tv" />