Android UI控件详解-Gallery(画廊)

package com.example.gallery;

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

/**
 * 
 * @author TXF
 * 
 * 用Gallery(画廊)实现图片的无限循环
 * 
 */
@SuppressLint("ShowToast")
public class MainActivity extends Activity {
	@SuppressWarnings("deprecation")
	private Gallery mga;
	private Context mcontext;
	private Integer[] mImageIds = { R.drawable.a, R.drawable.b, R.drawable.c,
			R.drawable.d, R.drawable.e };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		// 通过findViewById找到gallery对象
		mga = (Gallery) findViewById(R.id.gallery);
		// 设置整个界面的背景
		// mga.setBackgroundResource(R.drawable.ic_launcher);
		// 设置适配器
		mga.setAdapter(new MyAdapter(this));
		// 设置gallery条目被点击的事件监听
		mga.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView adapterView, View view,
					int position, long id) {
				Toast.makeText(MainActivity.this,
						"你选择了：" + (position + 1) + "号图片", 0).show();

			}
		});

	}

	// 写一个类继承基本适配器(自定义适配器)
	private class MyAdapter extends BaseAdapter {
		public MyAdapter(Context c) {
			mcontext = c;
		}

		@Override
		public int getCount() {
			// 整型的最大值为2的31次方减去1
			return Integer.MAX_VALUE;
		}

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

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

		@SuppressWarnings("deprecation")
		@Override
		public View getView(int position, View view, ViewGroup parent) {
			ImageView iv = new ImageView(mcontext);
			// 给imageview设置图片资源
			// 为了保证数组角标不能越界mImageIds里面的参数为position%mImageIds.length.
			iv.setImageResource(mImageIds[position % mImageIds.length]);
			// 设置布局图片以120*120显示(即图片显示尺寸)
			iv.setLayoutParams(new Gallery.LayoutParams(200, 200));
			// 设置显示比例类型
			iv.setScaleType(ImageView.ScaleType.CENTER);
			// 返回图片
			return iv;
		}

	}

}

xml布局

效果图