Android ViewPager实现无限循环的实例

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" > 
 
  <android.support.v4.view.ViewPager 
    android:id="@+id/viewpager" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 
  </android.support.v4.view.ViewPager> 
 
  <LinearLayout 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignBottom="@id/viewpager" 
    android:background="#33000000" 
    android:orientation="vertical" 
    android:padding="5dip" > 
 
    <TextView 
      android:id="@+id/tv_image_description" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_gravity="center_horizontal" 
      android:text="第一个引导页面" 
      android:textColor="@android:color/white" 
      android:textSize="14sp" /> 
 
    <LinearLayout 
      android:id="@+id/ll_points" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="5dip" 
      android:layout_gravity="center_horizontal" 
      android:orientation="horizontal" > 
    </LinearLayout> 
  </LinearLayout> 
 
</RelativeLayout> 

package com.example.viewpagertest; 
 
import java.util.ArrayList; 
import java.util.List; 
 
import android.app.Activity; 
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; 
 
public class MainActivity extends Activity implements OnPageChangeListener { 
 
  private List<ImageView> imageViewList; 
  private ViewPager mViewPager; 
 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setView(); 
    initView(); 
  } 
 
  public void setView() { 
    setContentView(R.layout.activity_splash_viewpager); 
 
  } 
 
  public void initView() { 
    mViewPager = (ViewPager) findViewById(R.id.viewpager); 
    prepareData(); 
     
    ViewPagerAdapter adapter = new ViewPagerAdapter(); 
    mViewPager.setAdapter(adapter); 
    mViewPager.setOnPageChangeListener(this); 
  } 
   
   private void prepareData() { 
      imageViewList = new ArrayList<ImageView>(); 
      int[] imageResIDs = getImageResIDs(); 
      ImageView iv; 
      for (int i = 0; i < imageResIDs.length; i++) { 
        iv = new ImageView(this); 
        iv.setBackgroundResource(imageResIDs[i]); 
        imageViewList.add(iv); 
         
      } 
    } 
     
   /** 
   * 在此处本来是5张图片，现在在数组首尾各加了一张图 
   * @return 
   */ 
    private int[] getImageResIDs() { 
      return new int[]{ 
          R.drawable.pic_02, 
          R.drawable.bg1, 
          R.drawable.bg2, 
          R.drawable.bg3, 
          R.drawable.pic_01, 
          R.drawable.pic_02, 
          R.drawable.bg1, 
 
      }; 
    } 
     
    class ViewPagerAdapter extends PagerAdapter { 
 
      @Override 
      public int getCount() { 
        return imageViewList.size(); 
      } 
 
      /** 
       * 判断出去的view是否等于进来的view 如果为true直接复用 
       */ 
      @Override 
      public boolean isViewFromObject(View arg0, Object arg1) { 
        return arg0 == arg1; 
      } 
 
      /** 
       * 销毁预加载以外的view对象, 会把需要销毁的对象的索引位置传进来就是position 
       */ 
      @Override 
      public void destroyItem(ViewGroup container, int position, Object object) { 
        container.removeView(imageViewList.get(position)); 
      } 
 
      /** 
       * 创建一个view 
       */ 
      @Override 
      public Object instantiateItem(ViewGroup container, int position) { 
        container.addView(imageViewList.get(position)); 
        return imageViewList.get(position); 
      } 
    } 
 
    @Override 
    public void onPageScrollStateChanged(int arg0) { 
       
    } 
 
    @Override 
    public void onPageScrolled(int arg0, float arg1, int arg2) { 
       
    } 
 
    @Override 
    public void onPageSelected(int position) { 
      if ( imageViewList.size() > 1) { //多于1，才会循环跳转 
        if ( position < 1) { //首位之前，跳转到末尾（N） 
          position = 5;  
          mViewPager.setCurrentItem(position,false); 
        } else if ( position > 5) { //末位之后，跳转到首位（1） 
          mViewPager.setCurrentItem(1,false); //false:不显示跳转过程的动画 
          position = 1; 
        } 
      }   
    } 
 
  @Override 
  protected void onDestroy() { 
    super.onDestroy(); 
  } 
 
} 

mViewPager.setCurrentItem(1,false); //false:不显示跳转过程的动画