在我的应用程序中有2个选项卡(
Android设计支持库)这是带有ViewPagerAdapter的片段：
public class ListaCanali extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 2 ;
@Override
public View onCreateView(LayoutInflater inflater,@Nullable ViewGroup container,@Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.lista_canali,container,false);
//Titolo Fragment
((MainActivity) getActivity()).setActionBarTitle("Lista Canali");
//FindViewById
tabLayout = (TabLayout) v.findViewById(R.id.tabs);
viewPager = (ViewPager) v.findViewById(R.id.viewpager);
//Funzioni Tab
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
@Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
return v;
}
//Adattatore Tab
class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new FragmentCanali();
case 1 : return new FragmentPreferiti();
}
return null;
}
public int getCount() {
return int_items;
}
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return "Tutti";
case 1 :
return "Preferiti";
}
return null;
}
解决方法
我相信这不是唯一/最好的方法.但这应该解决问题,就像它对我做的那样.
请在两者中写入refresh()方法
FragmentCanali和FragmentPreferiti Fragments.
public class ListCanali extends Fragment implements OnPageChangeListener{
private MyAdapter mAdapter;
@Override
public View OnCreateView (...) {
...
if(mAdapter == null) {
mAdapter = new MyAdapter(getChildFragmentManager());
}
viewPager.setAdapter(mAdapter);
viewPager.setOnPageChangeListener(this);
...
}
...
@Override
public void OnPageSelected (int position) {
switch (position){
case 0 : ((FragmentCanali)adapter.getItem(position)).refresh();
case 1 : ((FragmentPreferiti)adapter.getItem(position)).refresh();
}
}}
如果从具有抽象refresh()方法的基本片段扩展两个片段,它将更加清晰.
在onPageSelected()中你可以调用((BaseFragment)adapter.getItem(position)).refresh()
