使用ViewPager实现循环滚动播放图片广告

首先还是主布局文件：activity_main.xml

<?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"  >

    <android.support.v4.view.ViewPager
        android:id= "@+id/main_mView"
        android:layout_width= "fill_parent"
        android:layout_height= "0dp"
        android:layout_weight= "1.5"
        ></android.support.v4.view.ViewPager>

</LinearLayout>

java代码实现：MainActivity.java

package  com.action;
import  java.util.ArrayList;
import  java.util.List;
import  java.util.concurrent.Executors;
import  java.util.concurrent.ScheduledExecutorService;
import  java.util.concurrent.TimeUnit;

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



public  class  MainActivity  extends  FragmentActivity {

    //主布局ViewPager;
        private  ViewPager mViewPage;
        private  PagerAdapter mAdapter;

        private  List<ImageView> lsimage; //滑动图片的集合
        private  int [] imagid; //图片ID
        private  int  imagindex; //当前图片的索引号
        private  ScheduledExecutorService ses; //获取当前系统时间，为自动滑动确定时间

        // 切换当前显示的图片
        private  Handler handler =  new  Handler() {
            public  void  handleMessage(android.os.Message msg) {
                mViewPage.setCurrentItem(imagindex); // 切换当前显示的图片
            };
        };

    @Override
    protected  void  onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //图片的ID
        imagid= new  int []{R.drawable.qq,R.drawable.img_frame_background,R.drawable.ic_launcher,R.drawable.home_btn_bg};

        //图片的集合
        lsimage= new  ArrayList<ImageView>();
        //初始化图片资源（既通过图片ID拿到图片资源加入到图片集合中）
        for  ( int  i =  0 ; i < imagid.length; i++) {

            ImageView imageView= new  ImageView( this );

            imageView.setImageResource(imagid[i]);

            imageView.setScaleType(ScaleType.CENTER_CROP);

            //加入集合
            lsimage.add(imageView);

        }


        //============ViewPager的创建===============================
                //主布局ViewPager获取

                mViewPage=(ViewPager)findViewById(R.id.main_mView);



                //创建ViewPager适配器
                mAdapter= new  PagerAdapter() {

                    @Override
                    public  boolean  isViewFromObject(View arg0, Object arg1) {
                        // TODO Auto-generated method stub
                        return  arg0==arg1;
                    }

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

                    //创建这个适配器时，除了要强制重写以上两个方法外，还得重写一下两个方法

                    //这个方法是摧毁view
                    @Override
                    public  void  destroyItem(View container,  int  position, Object object) {
                        // TODO Auto-generated method stub
                        ((ViewPager) container).removeView(lsimage.get(position));
                    }

                    //这个方法是初始化view
                    @Override
                    public  Object instantiateItem(ViewGroup container,  int  position) {
                        // TODO Auto-generated method stub

                        //需要先获取View
                        View view=lsimage.get(position);
                        //然后将所有的view添加到ViewGroup这个存放view的容器中
                        container.addView(view);
                        //返回View
                        return  view;

                    }

                };
                //给View添加适配器
                mViewPage.setAdapter(mAdapter);

                //=================================================================
    }

    //当Activity启动时，才自动切换
    @Override
    protected  void  onStart() {

        ses=Executors.newSingleThreadScheduledExecutor();
        //当Activity显示出来时，每过两秒钟切换图片，具体的切换方法交个ScrollTask()；
        ses.scheduleAtFixedRate( new  ScrollTask(),  1 ,  2 , TimeUnit.SECONDS);
        super .onStart();
    }

    //当Activity停止时，停止切换，保证应用不会无故暂用内存
    @Override
    protected  void  onStop() {

        ses.shutdown();
        super .onStop();
    }


    //执行切换任务
    private  class  ScrollTask  implements  Runnable{
        public  void  run() {

            //使用线程同步
            synchronized (mViewPage){

                imagindex=(imagindex+ 1 )%lsimage.size();

                handler.obtainMessage().sendToTarget();
            }
        }
    }

}

完工是不是很简单

源码案例下载地址：http://download.csdn.net/detail/symahll2011/8879083源码下载地址

3个例子下载：http://download.csdn.net/detail/zhaihaohao1/8909873

转载地址：http://my.oschina.net/symahll/blog/475638