Android开发实现高仿优酷的客户端图片左右滑动切换功能实例【附源码下载】

package com.tony.viewpager;
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.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.TextView;
/**
 * 仿优酷Android客户端图片左右滑动
 *
 */
public class MyViewPagerActivity extends Activity {
  private ViewPager viewPager; // android-support-v4中的滑动组件
  private List imageViews; // 滑动的图片集合
  private String[] titles; // 图片标题
  private int[] imageResId; // 图片ID
  private List dots; // 图片标题正文的那些点
  private TextView tv_title;
  private int currentItem = 0; // 当前图片的索引号
  // An ExecutorService that can schedule commands to run after a given delay,
  // or to execute periodically.
  private ScheduledExecutorService scheduledExecutorService;
  // 切换当前显示的图片
  private Handler handler = new Handler() {
    public void handleMessage(android.os.Message msg) {
      viewPager.setCurrentItem(currentItem);// 切换当前显示的图片
    };
  };
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    imageResId = new int[] { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e };
    titles = new String[imageResId.length];
    titles[0] = "巩俐不低俗，我就不能低俗";
    titles[1] = "扑树又回来啦！再唱经典老歌引万人大合唱";
    titles[2] = "揭秘北京电影如何升级";
    titles[3] = "乐视网TV版大派送";
    titles[4] = "热血屌丝的反杀";
    imageViews = new ArrayList();
    // 初始化图片资源
    for (int i = 0; i < imageResId.length; i++) {
      ImageView imageView = new ImageView(this);
      imageView.setImageResource(imageResId[i]);
      imageView.setScaleType(ScaleType.CENTER_CROP);
      imageViews.add(imageView);
    }
    dots = new ArrayList();
    dots.add(findViewById(R.id.v_dot0));
    dots.add(findViewById(R.id.v_dot1));
    dots.add(findViewById(R.id.v_dot2));
    dots.add(findViewById(R.id.v_dot3));
    dots.add(findViewById(R.id.v_dot4));
    tv_title = (TextView) findViewById(R.id.tv_title);
    tv_title.setText(titles[0]);//
    viewPager = (ViewPager) findViewById(R.id.vp);
    viewPager.setAdapter(new MyAdapter());// 设置填充ViewPager页面的适配器
    // 设置一个监听器，当ViewPager中的页面改变时调用
    viewPager.setOnPageChangeListener(new MyPageChangeListener());
  }
  @Override
  protected void onStart() {
    scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
    // 当Activity显示出来后，每两秒钟切换一次图片显示
    scheduledExecutorService.scheduleAtFixedRate(new ScrollTask(), 1, 2, TimeUnit.SECONDS);
    super.onStart();
  }
  @Override
  protected void onStop() {
    // 当Activity不可见的时候停止切换
    scheduledExecutorService.shutdown();
    super.onStop();
  }
  /**
   * 换行切换任务
   *
   * @author Administrator
   *
   */
  private class ScrollTask implements Runnable {
    public void run() {
      synchronized (viewPager) {
        System.out.println("currentItem: " + currentItem);
        currentItem = (currentItem + 1) % imageViews.size();
        handler.obtainMessage().sendToTarget(); // 通过Handler切换图片
      }
    }
  }
  /**
   * 当ViewPager中页面的状态发生改变时调用
   *
   * @author Administrator
   *
   */
  private class MyPageChangeListener implements OnPageChangeListener {
    private int oldPosition = 0;
    /**
     * This method will be invoked when a new page becomes selected.
     * position: Position index of the new selected page.
     */
    public void onPageSelected(int position) {
      currentItem = position;
      tv_title.setText(titles[position]);
      dots.get(oldPosition).setBackgroundResource(R.drawable.dot_normal);
      dots.get(position).setBackgroundResource(R.drawable.dot_focused);
      oldPosition = position;
    }
    public void onPageScrollStateChanged(int arg0) {
    }
    public void onPageScrolled(int arg0, float arg1, int arg2) {
    }
  }
  /**
   * 填充ViewPager页面的适配器
   *
   * @author Administrator
   *
   */
  private class MyAdapter extends PagerAdapter {
    @Override
    public int getCount() {
      return imageResId.length;
    }
    @Override
    public Object instantiateItem(View arg0, int arg1) {
      ((ViewPager) arg0).addView(imageViews.get(arg1));
      return imageViews.get(arg1);
    }
    @Override
    public void destroyItem(View arg0, int arg1, Object arg2) {
      ((ViewPager) arg0).removeView((View) arg2);
    }
    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
      return arg0 == arg1;
    }
    @Override
    public void restoreState(Parcelable arg0, ClassLoader arg1) {
    }
    @Override
    public Parcelable saveState() {
      return null;
    }
    @Override
    public void startUpdate(View arg0) {
    }
    @Override
    public void finishUpdate(View arg0) {
    }
  }
}