ViewPager判断是向左划还是右划的实例

实例如下：

//记录上一次滑动的positionOffsetPixels值
  private int lastValue = -1;
   private boolean isLeft = true;


 mViewPager.addonPageChangeListener(new ViewPager.onPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
      if (positionOffset != 0) {
 if (lastValue >= positionOffsetPixels) {
   //右滑
   isLeft = false;
 } else if (lastValue < positionOffsetPixels) {
   //左滑
   isLeft = true;
 }
 setIndiactorView(positionOffset,isLeft);
      }
      lastValue = positionOffsetPixels;

    }

    @Override
    public void onPageSelected(int position) {
      if (isLeft){
 Log.e("onPageScrolled","--->左划");
      }else {
 Log.e("onPageScrolled","--->右划");

      }
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }
  });

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