AndroidViewPager导航小圆点实现无限循环效果

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>


  

  


    

    

    

    

    

    
  

public class HomePageFragment extends BaseFragment {

  private View view;
  private ViewPager mViewPager;//顶部信息推荐栏
  private MyViewPagerAdapter mViewPagerAdapter;
  private LinearLayout ll_dots_homepage_top;//顶部信息推荐栏导航点
  private int GUIDE_NUMBER = 4; //顶部信息推荐栏的数量
  private ImageView[] dotImages; //顶部信息推荐栏引导小圆点
  private int dotCurrentIndex; //顶部信息推荐栏小圆点偏移量
  private MyOnPageChangeListener mOnPageChangeListener;

  private List mListDataViewPage;
  private Context context;

  @Override
  public void onAttach(Context context) {
    super.onAttach(context);
    this.cOntext= context;
  }

  @Nullable
  @Override
  public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable
      Bundle savedInstanceState) {
    view = inflater.inflate(R.layout.frament_homepage, container, false);

    initData();
    initView();

    return view;
  }

  /**
   * 初始化一些基础数据
   */
  private void initData() {
    if (mListDataViewPage != null) {
      mListDataViewPage.clear();
      mListDataViewPage = null;
    } else {
      mListDataViewPage = new ArrayList<>();
      // 为了实现无限循环，首位两张图片都是重复的
      int[] resource = new int[]{
          R.drawable.test_viewpager_homepage_4, R.drawable.test_viewpager_homepage_1, R.drawable.test_viewpager_homepage_2, R
          .drawable.test_viewpager_homepage_3, R.drawable.test_viewpager_homepage_4,R.drawable.test_viewpager_homepage_1,};

      for (int i = 0; i <6; i++) {
        WeakReference bitmao = new WeakReference(BitmapFactory
            .decodeResource(getResources(), resource[i]));
        ImageView imageView = new ImageView(context);
        imageView.setImageBitmap(bitmao.get());
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);
        mListDataViewPage.add(imageView);
      }

    }

  }

  /**
   * 初始化底部推信息推荐栏引导小圆点View
   */
  private void initDots() {
    dotImages = new ImageView[mListDataViewPage.size()];
    for (int i = 0; i  mListDataViewPage.size() || position == dotCurrentIndex) {
        return;
      }

      if ( mListDataViewPage.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 = 4;
          mViewPager.setCurrentItem(position,false);
        } else if ( position > 4) { //末位之后，跳转到首位（1）
          position = 1;
          mViewPager.setCurrentItem(position,false); //false:不显示跳转过程的动画

        }else {
          dotImages[dotCurrentIndex].setEnabled(false);
          dotImages[position].setEnabled(true);
          dotCurrentIndex = position;
        }
      }


    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }
  }
}