自定义

public class FragMent extends Fragment {

private TabLayout tab;
private ViewPager pager;
private ArrayList<ChannelItem> tabData=new ArrayList<>();
private ArrayList<frag01> listtt;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View inflate = inflater.inflate(R.layout.fragment1, null);

    listtt = new ArrayList<frag01>();
    ImageView iii = inflate.findViewById(R.id.iii);
    tabData = DBUtil.getTabData(getActivity());
    for (int i=0;i<tabData.size();i++){
        listtt.add(new frag01());
    }
    iii.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getActivity(),ChannelActivity.class);
            startActivityForResult(intent,0);
        }
    });

    tab = inflate.findViewById(R.id.tab);

    pager = inflate.findViewById(R.id.pager);

    TabAdapter adapter = new TabAdapter(getActivity().getSupportFragmentManager(),listtt,tabData);
    pager.setAdapter(adapter);
    tab.setupWithViewPager(pager);


    return inflate;
}

《！===========================！》

public class TabAdapter extends FragmentPagerAdapter {
// String[] strings= new String[]{“holler”,“word”};
private ArrayList listtt;
private ArrayList tabData;
public TabAdapter(FragmentManager fm, ArrayList listtt, ArrayList tabData) {
super(fm);
this.listtt=listtt;
this.tabData=tabData;
}

@Override
public Fragment getItem(int i) {

// switch (i){
// case 0:
// return new frag01();
// case 1:
// return new frag02();
// }
return listtt.get(i);
}

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

@Nullable
@Override
public CharSequence getPageTitle(int position) {
    return tabData.get(position).getName();
}

}