rg_movie.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(RadioGroup group, int checkedId) {ft = fm.beginTransaction();switch (checkedId) {case R.id.rb_movie_film:ft.hide(cinemaFragment).show(filmFragment);ft.commit();break;case R.id.rb_movie_cinema:ft.hide(filmFragment).show(cinemaFragment);ft.commit();break;}}});

private void initView(View v) {cttl_film_tab = v.findViewById(R.id.cttl_film_tab);vp_film_viewpager = v.findViewById(R.id.vp_film_viewpager);}private void initTab(final List<Fragment> fragments) {titles = new String[]{"正在热映", "即将热映"};for (int i = 0; i < titles.length; i++) {fragments.add(MyFragment.newInstance());}//这里要使用getChildFragmentManager()//因为InputAddPhotoFragment属于我当期的Fragment，所以需要用我当前Fragment的FragmentManager去管理，而不是使用Activity的FragmentManager去管理。使用到的获取方法 就是getChildFragmetManager()。vp_film_viewpager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {@Overridepublic Fragment getItem(int position) {return fragments.get(position);}@Overridepublic int getCount() {return titles.length;}@Overridepublic CharSequence getPageTitle(int position) {return titles[position];}});cttl_film_tab.setupWithViewPager(vp_film_viewpager);}

    /** * Return a private FragmentManager for placing and managing Fragments * inside of this Fragment. */  final public FragmentManager getChildFragmentManager() {  if (mChildFragmentManager == null) {  instantiateChildFragmentManager();  if (mState >= RESUMED) {  mChildFragmentManager.dispatchResume();  } else if (mState >= STARTED) {  mChildFragmentManager.dispatchStart();  } else if (mState >= ACTIVITY_CREATED) {  mChildFragmentManager.dispatchActivityCreated();  } else if (mState >= CREATED) {  mChildFragmentManager.dispatchCreate();  }  }  return mChildFragmentManager;  }  

    /** * Return the FragmentManager for interacting with fragments associated * with this activity. */  public FragmentManager getSupportFragmentManager() {  return mFragments;  }