新建adapter继承FragmentPagerAdapter

public class TabFragmentPagerAdapter extends FragmentPagerAdapter {
    private FragmentManager mFragmentManager;
    private List<Fragment> mList;

    public TabFragmentPagerAdapter(FragmentManager fm, List<Fragment> list) {
        super(fm);
        this.mList = list;
    }

    @Override
    public Fragment getItem(int position) {
        return mList.get(position);
    }

    @Override
    public int getCount() {
        return mList.size();
    }
}

在activity中的使用

private ViewPager viewPager;
private TabFragmentPagerAdapter tabFragmentPagerAdapter;
private List<Fragment> fragments;

fragments = new ArrayList<>();
fragments.add(new MainFragment());
fragments.add(new ListFragment());
fragments.add(new ThreeFragment());
fragments.add(new StudyFragment());

tabFragmentPagerAdapter = new TabFragmentPagerAdapter(getSupportFragmentManager(), fragments);
viewPager.setAdapter(tabFragmentPagerAdapter);