Synchronizing two ViewPagers using OnPageChangeListener

Question

I\'m trying to synchronize two ViewPagers, as apparently have quite a lot of people before me, and I\'ve got as far as this:

private ViewPager m         


        

Answer 1

I solved this problem in a much easier (and cleaner) way using the OnPageChangeListener:

mViewPager1.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

      private int mScrollState = ViewPager.SCROLL_STATE_IDLE;

      @Override
      public void onPageScrolled(final int position, final float positionOffset, final int positionOffsetPixels) {
        if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
          return;
        }
        mViewPager2.scrollTo(mViewPager1.getScrollX(), mViewPager2.getScrollY());
      }

      @Override
      public void onPageSelected(final int position) {

      }

      @Override
      public void onPageScrollStateChanged(final int state) {
        mScrollState = state;
        if (state == ViewPager.SCROLL_STATE_IDLE) {
          mViewPager2.setCurrentItem(mViewPager1.getCurrentItem(), false);
        }
      }
});

mViewPager2.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

      private int mScrollState = ViewPager.SCROLL_STATE_IDLE;

      @Override
      public void onPageScrolled(final int position, final float positionOffset, final int positionOffsetPixels) {
        if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
          return;
        }
        mViewPager1.scrollTo(mViewPager2.getScrollX(), mViewPager1.getScrollY());
      }

      @Override
      public void onPageSelected(final int position) {

      }

      @Override
      public void onPageScrollStateChanged(final int state) {
        mScrollState = state;
        if (state == ViewPager.SCROLL_STATE_IDLE) {
          mViewPager1.setCurrentItem(mViewPager2.getCurrentItem(), false);
        }
      }
});