Dont allow viewpager load two page in the first time

问题

At the moment, i have a viewpager,when page scroll,i have load api for get new information. But in the first load viewpager,progress loading display two twice because it load first page and next page. I only want to load the first page in viewpager. How must I do?

回答1:

best way is to create one interface. and implement this interface to all fragment. e.g.

public interface FragmentInterface {    
    void fragmentBecameVisible();
}

• in ur viewpager activity put like this e.g

  viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener(){
  
          @Override
          public void onPageSelected(int position){
                  FragmentInterface fragment = (FragmentInterface) mAdapter.instantiateItem(viewPager, position); 
              if (fragment != null) {
                  fragment.fragmentBecameVisible();
              } 
  
              actionBar.setSelectedNavigationItem(position);
  
          }
  
          @Override
          public void onPageScrolled(int arg0, float arg1, int arg2){
          }
  
          @Override
          public void onPageScrollStateChanged(int arg0) {
          }
      });
  

• in your fragment like

  public class TestFragmet extends Fragment implements FragmentInterface {
  
      @Override
      public void fragmentBecameVisible() {
      // your task to execute
      }
  
  }
  

回答2:

Put OffScreenPageLimit to ZERO. It won't load other fragments.

viewPager.setOffscreenPageLimit(0);

来源：https://stackoverflow.com/questions/26942304/dont-allow-viewpager-load-two-page-in-the-first-time