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main.xml如下:

MainActivity如下:

import android.os.Bundle;import android.app.Activity;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;/** * Demo描述: * 利用Gallery预览图片.点击其中的某张图片时 * 将该图片在ImageView中显示 * */public class MainActivity extends Activity {    private int imagesID []= null;    private Gallery mGallery;    private ImageView mImageView;    private BaseAdapter mBaseAdapter;    @Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		init();		mGallery.setAdapter(mBaseAdapter);		//mGallery初始时显示的图片		mGallery.setSelection(imagesID.length/2);		mGallery.setOnItemClickListener(new OnItemClickListener() {			@Override			public void onItemClick(AdapterView
    parent, View view,int position, long id) {				Toast.makeText(getApplicationContext(),			    "点击了第" + (position + 1) + "张图片", Toast.LENGTH_SHORT).show();				//点击时切换图片				mImageView.setImageResource(imagesID[position]);			}		});	}   	private void init() {		mGallery=(Gallery) findViewById(R.id.gallery);		imagesID=new int []{				R.drawable.a,R.drawable.b,R.drawable.c,R.drawable.d,				R.drawable.e,R.drawable.f,R.drawable.g,R.drawable.h};		mImageView=(ImageView) findViewById(R.id.imageView);		//mImageView初始时显示的图片		mImageView.setImageResource(imagesID[imagesID.length/2]);		mBaseAdapter = new BaseAdapter() {			@Override			public View getView(int position, View convertView, ViewGroup parent) {				ImageView imageView = new ImageView(MainActivity.this);				//设置图片来源				imageView.setImageResource(imagesID[position]);				//拉伸图片以填充View的高宽				imageView.setScaleType(ImageView.ScaleType.FIT_XY);				//控制显示图片的大小				imageView.setLayoutParams(new Gallery.LayoutParams(130, 130));				imageView.setBackgroundColor(0xFF000000);				return imageView;			}			@Override			public long getItemId(int position) {				return position;			}			@Override			public Object getItem(int position) {				return position;			}			@Override			public int getCount() {				return imagesID.length;			}		};	}}

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