Question

我正在尝试从另一个类更新适配器的数据集，但没有任何帮助。当我从RecyclerView类中调用该方法时，它可以工作但不能从外部工作。

private Filters dataFilters = new Filters();
private HomeSpinnerHandler homeSpinnerHandler = new HomeSpinnerHandler(this);
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mHomeAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private static Context context;
private SwipeRefreshLayout mSwipeRefreshLayout;
private View rootView;
private String homeCompanySelection = null;
private static final String objectTypeProductString = "Product";
private static MaterialDialog dialogHome;
private FloatingActionButton fabHome;
private View viewHome;
private MaterialSpinner spinnerHomeCompany;
private static boolean filterIsCalled = false;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    rootView = inflater.inflate(R.layout.home_layout, null);
    mSwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.home_refresh);
    mRecyclerView = (RecyclerView) rootView.findViewById(R.id.home_recycler_view);
    spinnerHomeCompany = (MaterialSpinner) rootView.findViewById(R.id.spinnerHomeCompany);
    viewHome = rootView.findViewById(R.id.sheetHome);
    context = container.getContext();
    fabHome = (FloatingActionButton) rootView.findViewById(R.id.fabhome);
    dialogHome = new MaterialDialog(context);
    mRecyclerView.setHasFixedSize(false);
    mLayoutManager = new LinearLayoutManager(getActivity());
    mRecyclerView.setLayoutManager(mLayoutManager);
    mHomeAdapter = new RecyclerViewHomeAdapter(dataFilters.getAllHomeDataSet());

    PreCachingLayoutManager layoutManager = new PreCachingLayoutManager(getActivity());
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    layoutManager.setSmoothScrollbarEnabled(true);

    mRecyclerView.setLayoutManager(layoutManager);
    mRecyclerView.setAdapter(mHomeAdapter);
    mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            updateView();
            mSwipeRefreshLayout.setRefreshing(false);
        }
    });
    homeSpinnerHandler.addItemsOnCompanySpinner();
    spinnerHomeCompany.setOnItemSelectedListener(homeSpinnerHandler);

    fabHome.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            viewHome.setVisibility(View.VISIBLE);
            if (viewHome != null) {
                ViewGroup parent = (ViewGroup) viewHome.getParent();
                if (parent != null) {
                    parent.removeView(viewHome);
                }
            }
            dialogHome.setView(viewHome).setPositiveButton("ΑΝΑΖΗΤΗΣΗ", new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    companyFilter();
                    dialogHome.dismiss();
                    viewHome.setVisibility(View.GONE);
                }
            }).setNegativeButton("ΑΚΥΡΩΣΗ", new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialogHome.dismiss();
                    viewHome.setVisibility(View.GONE);
                }
            });
            dialogHome.show();
        }
    });

    return rootView;
}

@Override
public void onResume() {
    super.onResume();
    ((RecyclerViewHomeAdapter) mHomeAdapter).setOnItemClickListener(new RecyclerViewHomeAdapter.MyClickListener() {
        @Override
        public void onItemClick(int position, View v, int id, String objectType) {

            if (objectType.contains(objectTypeProductString)) {
                ((MainActivity) getActivity()).onProductItemClick(id);
            } else {
                ((MainActivity) getActivity()).onPostItemClick(id);
            }
        }
    });
}

public boolean onBackPressed()
{
    if (filterIsCalled){
        Toast.makeText(context,"dsdsd",Toast.LENGTH_SHORT).show();
        updateView();
        filterIsCalled = false;
    } else
        return true;
    return false;
}

public void companyFilter() {
    homeSpinnerHandler.addItemsOnCompanySpinner();
    mHomeAdapter = new RecyclerViewHomeAdapter(dataFilters.getFilteredHomeDataSet(homeCompanySelection));
    mRecyclerView.setAdapter(mHomeAdapter);
    filterIsCalled = true;
}

public void updateView() {
    mHomeAdapter = new RecyclerViewHomeAdapter(dataFilters.getAllHomeDataSet());
    mRecyclerView.setAdapter(mHomeAdapter);
}


public Context getContext() {
    return context;
}

public void setHomeCompanySelection(String homeCompanySelection) {
    this.homeCompanySelection = homeCompanySelection;
}

public MaterialSpinner getSpinnerHomeCompany() {
    return spinnerHomeCompany;
}

从另一个班级我正在创建一个实例

HomeFragment homeFragment = new HomeFragment();

并调用方法，如。

homeFragment.updateView();

我也尝试过使用静态变量，但没有再次成功。

Answer 1

不要将其设为静态或创建homeFragment的新实例。

尝试将mHomeAdapter传递给新类并在那里进行更新。你也不应该制作新的适配器。在适配器中创建这样的方法：

 public void changeData(Data data ) {
        mData = data;
        notifyDataSetChanged();
    }

然后调用它来更改数据。

更好的是你可以使用startActivityForResult（）而不是传递你的适配器，或者你可以在HomeFragment中创建一个广播接收器来更新适配器。

从另一个类更新RecyclerView数据集

1 个答案: