package com.app.test01;import com.app.adapter.ImageAdapter;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.Gallery;import android.widget.ImageView;public class GalleryTest extends Activity{    Gallery gallery;    ImageView imagedemo;    ImageAdapter iAdapter = new ImageAdapter(this);    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_gallery);                gallery = (Gallery) findViewById(R.id.gallery1);        imagedemo = (ImageView) findViewById(R.id.imagedemo);                gallery.setAdapter(iAdapter);        gallery.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view,                    int position, long id) {                // TODO Auto-generated method stub                Integer[] iViews = iAdapter.getmImageIds();                imagedemo.setImageDrawable(getResources().getDrawable(iViews[position]));            }        });    }}

package com.app.adapter;import com.app.test01.R;import android.content.Context;import android.content.res.TypedArray;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;    public ImageAdapter(Context c) {        mContext = c;    }    public int getCount() {        return mImageIds.length;    }    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(mImageIds[position]);        i.setLayoutParams(new Gallery.LayoutParams(150,75));        return i;    }    public Integer[] getmImageIds() {        return mImageIds;    }    public void setmImageIds(Integer[] mImageIds) {        this.mImageIds = mImageIds;    }    private Integer[] mImageIds = {            R.drawable.image01,            R.drawable.image02,            R.drawable.image03,            R.drawable.image04,            R.drawable.image05,            R.drawable.image06,            R.drawable.image07,            R.drawable.image08,            R.drawable.image09,            R.drawable.image01,            R.drawable.image02,            R.drawable.image03,            R.drawable.image04,            R.drawable.image05,            R.drawable.image06,            R.drawable.image07,            R.drawable.image08,            R.drawable.image09,    };}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Gallery        android:id="@+id/gallery1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="50dp" />    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:gravity="center">                <ImageView            android:id="@+id/imagedemo"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/image01" />    </RelativeLayout></LinearLayout>