Android使用ViewPager实现图片轮播

1.activity_main.xml文件中

2.MainActivity.java文件中

package com.t20.viewpagerdemo;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.app.Activity;

public class MainActivity extends Activity {

	private ViewPager vp;
	private MyAdapter myAdapter;
	private List imgList;
	// 获取到图片
	private Integer[] img = { R.drawable.pic1, R.drawable.pic2,
			R.drawable.pic3, R.drawable.pic4 };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		vp = (ViewPager) findViewById(R.id.vp);

		imgList = new ArrayList();

		// 将图片放到集合中
		for (int i = 0; i < img.length; i++) {
			ImageView iv = new ImageView(this);
			iv.setImageResource(img[i]);
			// 将图片全屏显示
			iv.setScaleType(ScaleType.FIT_XY);
			imgList.add(iv);
		}

		// 进行适配
		myAdapter = new MyAdapter();
		vp.setAdapter(myAdapter);
	}

	/**
	 * 自定义适配器
	 * 
	 * @author Administrator
	 * 
	 */
	class MyAdapter extends PagerAdapter {

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return imgList.size();
		}

		@Override
		public boolean isViewFromObject(View view, Object obj) {
			// TODO Auto-generated method stub
			return view == obj;
		}

		/**
		 * 实例化视图内容（创建要显示的内容）
		 */
		@Override
		public Object instantiateItem(ViewGroup container, int position) {
			// TODO Auto-generated method stub
			container.addView(imgList.get(position));
			return imgList.get(position);
		}

		/**
		 * 销毁视图内容
		 */
		@Override
		public void destroyItem(ViewGroup container, int position, Object object) {
			// TODO Auto-generated method stub
			container.removeView((View) object);
		}
	}
}