andriod 滑动图片

package com.test.gallery;

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class GalleryTestActivity extends Activity {
   
    private Gallery gallery;
   
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        gallery=(Gallery) findViewById(R.id.gallery);
        gallery.setAdapter(new ImageAdapter(this));
        gallery.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                    Toast.makeText(GalleryTestActivity.this, "" + position, Toast.LENGTH_SHORT).show();
            }
           
        });
    }
   
    class ImageAdapter extends BaseAdapter{

        private int mGalleryItemBackground;
       
        private Context mContext;
       
        private Integer [] bgs={
                R.drawable.sample_0,
                R.drawable.sample_1,
                R.drawable.sample_2,
                R.drawable.sample_3,
                R.drawable.sample_4,
                R.drawable.sample_5,
                R.drawable.sample_6,
                R.drawable.sample_7
        };
       
        public ImageAdapter(Context mContext){
            this.mContext=mContext;
            TypedArray a = obtainStyledAttributes(R.styleable.HelloGallery);
            mGalleryItemBackground = a.getResourceId(
                    R.styleable.HelloGallery_android_galleryItemBackground, 0);
            a.recycle();

        }
       
        @Override
        public int getCount() {
            return bgs.length;
        }

        @Override
        public Object getItem(int position) {
            return position;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
             ImageView i = new ImageView(mContext);

                i.setImageResource(bgs[position]);
                i.setLayoutParams(new Gallery.LayoutParams(150, 100));
                i.setScaleType(ImageView.ScaleType.FIT_XY);
                i.setBackgroundResource(mGalleryItemBackground);

                return i;

        }
       
    }
}