java - 如何重新创建或刷新 fragment

Question

我有用于显示 NavigationDrawer 的 fragment 。其中我有第一部分的标题，其中包含一些信息。此信息发生变化，并且使用 EventBus 我控制此事件，但如何更新此 fragment ？

只有当我旋转设备时，下面的实现才有效。

从 MainActivity 中摘录:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main_activity);


        mNavigationNavDrawerFragment = (Nav_DrawerFragment) getFragmentManager().findFragmentById(R.id.fragment_drawer);
        mNavigationNavDrawerFragment.setup(R.id.fragment_drawer, (DrawerLayout) findViewById(R.id.drawer), mToolbar);


        inizialized(mServices);

    }

....
....

  EventBus.getDefault().postSticky(new PersonDetails(mNomeCognome, mEmail));

 //HERE HOW CAN REFRESH OR RECREATE THIS mNavigationNavDrawerFragment?

}

从 Nav_DrawerFragment 中摘录:

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {


        View view = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
        mDrawerList = (RecyclerView) view.findViewById(R.id.drawerList);
        LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        mDrawerList.setLayoutManager(layoutManager);
        mDrawerList.setHasFixedSize(true);
        final List<NavigationItem> navigationItems = getMenu();

       //HERE I SET THE UPDATE DATA
        Nav_adapter adapter = new Nav_adapter(navigationItems,mNomeCognome,mEmail);
        adapter.setNavigationDrawerCallbacks(this);

        mDrawerList.setAdapter(adapter);
        selectItem(mCurrentSelectedPosition,items);
        return view;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        EventBus.getDefault().registerSticky(this);



    }

    public void onEventMainThread(PersonDetails event){

        mNomeCognome = event.mNomeCognome;
        mEmail = event.mEmail;

    }

public void setup(int fragmentId, DrawerLayout drawerLayout, Toolbar toolbar) {

        mFragmentContainerView = getActivity().findViewById(fragmentId);
        mDrawerLayout = drawerLayout;
        mActionBarDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                if (!isAdded()) return;
                getActivity().invalidateOptionsMenu();
            }

            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                if (!isAdded()) return;
                getActivity().invalidateOptionsMenu();

            }
        };

Answer 1

我可以看到您正在将 RecyclerView 与适配器一起使用

Nav_adapter adapter = new Nav_adapter(navigationItems,mNomeCognome,mEmail);

然后您将更新用于在事件上创建适配器的值

mNomeCognome = event.mNomeCognome;
mEmail = event.mEmail;

问题是您没有将这些值传递给适配器。

因此，您必须创建一种方法将这些更新后的值传递给现有适配器，如下所示:

// first define your adapter as a field:
Nav_adapter adapter;

// then on your event
public void onEventMainThread(PersonDetails event){
   mNomeCognome = event.mNomeCognome;
   mEmail = event.mEmail;
   adapter.setNewValues(mNomeCognome, mEmail);
}

然后在这个 setNewValues 中更新适配器值，并且不要忘记调用 notifyItemChanged 之一或notifyItemRangeChanged适配器上的方法，以便可以在屏幕上更新新值。