Android使用ViewPager实现左右无限滑动

package com.viewpager;  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.support.v4.view.ViewPager.OnPageChangeListener; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.app.Activity;  public class MainActivity01 extends Activity implements OnPageChangeListener {   private ViewPager viewPager;  static final int arrays[] = { R.drawable.guide1, R.drawable.guide2,    R.drawable.guide3, R.drawable.guide4, R.drawable.guide5 };  private List<ImageView> views;  private int currentPage = 0;  private ImageView imageView;   private MyViewPagerAdapter viewPagerAdapter;   @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   initWidget();  }   private void initWidget() {   viewPager = (ViewPager) findViewById(R.id.viewpager);    views = new ArrayList<ImageView>();   for (int i = 0; i < 3; i++) {    imageView = new ImageView(this);    imageView.setLayoutParams(new ViewGroup.LayoutParams(      ViewGroup.LayoutParams.MATCH_PARENT,      ViewGroup.LayoutParams.MATCH_PARENT));    views.add(imageView);   }    initImageData();    viewPagerAdapter = new MyViewPagerAdapter();   viewPager.setAdapter(viewPagerAdapter);   viewPager.setCurrentItem(1);   viewPager.setOnPageChangeListener(this);  }   private void initImageData() {   for (int i = 0; i < 3; i++) {    imageView = views.get(i);    if (i == 0) {     imageView.setImageResource(arrays[arrays.length - 1]);    } else {     imageView.setImageResource(arrays[i - 1]);    }   }  }   class MyViewPagerAdapter extends PagerAdapter {    @Override   public int getCount() {    // TODO Auto-generated method stub    return views.size();   }    @Override   public boolean isViewFromObject(View arg0, Object arg1) {    // TODO Auto-generated method stub    return arg0 == arg1;   }    @Override   public Object instantiateItem(ViewGroup container, int position) {    imageView = views.get(position);    container.addView(imageView);    return imageView;   }    @Override   public void destroyItem(ViewGroup container, int position, Object object) {    // TODO Auto-generated method stub    container.removeView((View) object);   }   }   // 当滑动状态改变时调用  @Override  public void onPageScrollStateChanged(int state) {   // TODO Auto-generated method stub   System.out.println("--onPageScrollStateChanged--state--:" + state);   switch (state) {   // 在滚动完成后   case ViewPager.SCROLL_STATE_IDLE:    int currentItem = viewPager.getCurrentItem();     System.out.println("--currentItem--00--:" + currentItem);    System.out.println("--currentPage--00--:" + currentPage);    if (viewPager.getCurrentItem() == 1) {     // 如果位置没有变终止循环     break;    }     if (viewPager.getCurrentItem() > 1) {     currentPage++;    } else {     currentPage--;    }     System.out.println("--currentPage--11--:" + currentPage);    if (currentPage == arrays.length) {     currentPage = 0;    }     if (currentPage == -1) {     currentPage = arrays.length - 1;    }     System.out.println("--currentPage--22--:" + currentPage);     if (currentPage == 0) {     views.get(0).setImageResource(arrays[arrays.length - 1]);    } else {     views.get(0).setImageResource(arrays[currentPage - 1]);    }     views.get(1).setImageResource(arrays[currentPage]);     if (currentPage == arrays.length - 1) {     views.get(2).setImageResource(arrays[0]);    } else {     views.get(2).setImageResource(arrays[currentPage + 1]);    }     viewPager.setCurrentItem(1, false);     currentItem = viewPager.getCurrentItem();     System.out.println("--currentItem--11--:" + currentItem);    break;   }  }   // 当当前页面被滑动时调用  @Override  public void onPageScrolled(int position, float positionOffset,    int positionOffsetPixels) {   // TODO Auto-generated method stub   // System.out.println("--onPageScrolled--position--:" + position);  }   // 当新的页面被选中时调用  @Override  public void onPageSelected(int position) {   // TODO Auto-generated method stub   System.out.println("--onPageSelected--position--:" + position);  } }