刷新选项卡式布局viewpager中的当前片段

我正在尝试刷新viewpager选项卡式布局中的当前片段。我有 一个片段(UserProgressFragment) 创建ViewPager并设置 适配器(UserProgressAdapter) 以及创建选项卡式布局。

在我的UserProgressAdapter中,在getItem()方法中,我根据我所在的选项卡返回另外两个片段(UserWeightTrackerFragment和UserCarolicoCounterFragment)。

我的问题是,由于对viewpager和adapter的访问是在UserProgressFragment中设置的,因此如何通过单击按钮刷新片段并从UserCarrioCounterFragment更新其内容/视图? 我已经考虑过为适配器notifyDataChange,但我不知道如何从这个类调用它,因为它是在UserProgressFragment类上设置的。如果需要上下文,刷新此页面的目的是更新特定视图,即图表。

我已附上以下代码:

UserProgressFragment

public class UserProgressFragment extends Fragment{


public static UserProgressFragment newInstance() {
    return new UserProgressFragment();
}

public UserProgressFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view =  inflater.inflate(R.layout.fragment_user_progress, container, false);

    ViewPager viewPager = view.findViewById(R.id.progress_viewpager);
    viewPager.setAdapter(new UserProgressTabsAdapter(getChildFragmentManager()));

    TabLayout tabLayout = view.findViewById(R.id.progress_sliding_tabs);
    tabLayout.setupWithViewPager(viewPager, true);

    return view;

    }
}

用户进度选项卡适配器

public class UserProgressTabsAdapter extends FragmentStatePagerAdapter {

private static final int PAGE_COUNT = 2;
private String tabTitles[] = new String[]{"Weight Tracker", "Calorie Counter"};

public UserProgressTabsAdapter(FragmentManager fm) {
    super(fm);
}

@Override
public Fragment getItem(int position) {
    switch (position) {
        case 0:
            return UserWeightTrackerFragment.newInstance(position);

        case 1:
            return UserCalorieCounterFragment.newInstance(position + 1);
    }
    return null;
}

@Override
public int getCount() {
    return PAGE_COUNT;
}

@Override
public CharSequence getPageTitle(int position) {
    // Generate title based on item position
    return tabTitles[position];
}

UserCarrioCounterFragment(需要刷新此)

public class UserCalorieCounterFragment extends Fragment implements View.OnClickListener, AdapterView.OnItemSelectedListener {

public static final String ARG_PAGE = "ARG_PAGE";

public static UserCalorieCounterFragment newInstance(int page) {
    Bundle args = new Bundle();
    args.putInt(ARG_PAGE, page);
    UserCalorieCounterFragment fragment = new UserCalorieCounterFragment();
    fragment.setArguments(args);
    return fragment;
}

public UserCalorieCounterFragment() {
    // Required empty public constructor
}

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    int mPage = getArguments().getInt(ARG_PAGE);
}

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_user_calorie_counter, container, false);

    Button mAddCalories = view.findViewById(R.id.btn_add_calorie);
    mAddCalories.setOnClickListener(this);

    return view;
}

@Override
public void onClick(View view) {
    switch (view.getId()) {
        case R.id.btn_add_calorie:
            //REFRESH/UPDATE HERE 
            break;
    }
}