Android使用ViewPager用代码实现图片轮播效果

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);
		}
	}
}