Question

我有一个包含片段的“ ProfileBaseActivity”。该活动在xml中具有一个自定义工具栏：

...

<android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:elevation="0dp"
        android:minHeight="?attr/actionBarSize"
        ....
        />

...

我使用Java为每个片段在活动中设置工具栏：

private void setupToolbar() {
        toolbar.getMenu().clear();
        toolbar.inflateMenu(R.menu.top_navigation);

        ...
    }

我在3个片段中具有相同的工具栏，但我的第4个片段中包含一个RecyclerView列表。.并且我想更改该片段中的工具栏以使用SearchView对列表进行排序，所以我创建了一个菜单xml：

<?xml version="1.0" encoding="utf-8"?>
<menu
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    >

    <item
        android:id="@+id/action_search_view"
        android:title="Search"
        android:icon="@drawable/toolbar_serach_icon"
        app:showAsAction="always"
        app:actionViewClass="android.support.v7.widget.SearchView"
        />

</menu>

如果用户转到“搜索”片段，则“ ProfileBaseActivity”只会清除工具栏的菜单，例如toolbar.getMenu().clear();

在“搜索”片段中，我试图设置工具栏。我尝试了两种不同的方法：

第一

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment_search, container, false);
        recyclerView = view.findViewById(R.id.companies_rec_view);
        adapter = new CompanyListRecyclerViewAdapter(getContext(), companies);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        recyclerView.setAdapter(adapter);
        setHasOptionsMenu(true);
        return view;
    }

        @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }


    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.toolbar_serach, menu);
        MenuItem menuItem = menu.findItem(R.id.action_search_view);
        SearchView searchView = (SearchView) menuItem.getActionView();
        searchView.setOnQueryTextListener(this);
        super.onCreateOptionsMenu(menu, inflater);
    }

此解决方案无效，因为SearchView未显示在工具栏中。

第二

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

        toolbar = getActivity().findViewById(R.id.toolbar);
        toolbar.inflateMenu(R.menu.toolbar_serach);
        MenuItem menuItem = toolbar.getMenu().findItem(R.id.action_search_view);
        SearchView searchView = (SearchView) menuItem.getActionView();
        searchView.setOnQueryTextListener(this);

        recyclerView = view.findViewById(R.id.companies_rec_view);
        adapter = new CompanyListRecyclerViewAdapter(getContext(), companies);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        recyclerView.setAdapter(adapter);
        return view;
    }

此版本更好一点，因为工具栏中显示了SearchView，但不幸的是，它在行NullPointerException上抛出了SearchView searchView = (SearchView) menuItem.getActionView();

当然我已经在我的Fragment中实现了SearchFragment extends Fragment implements SearchView.OnQueryTextListener之类的SearchView，并且我覆盖了来自接口的两种方法：

@Override
    public boolean onQueryTextSubmit(String s) {
        return false;
    }

    @Override
    public boolean onQueryTextChange(String s) {

        List<Company> companiesNewList = new ArrayList<>();

        for(Company company : companies){
            if(company.getName().toLowerCase().equals(s.toLowerCase()) || company.getCity().equals(s.toLowerCase())){
                companiesNewList.add(company);
            }
        }

        adapter.updateList(companiesNewList);

        return true;
    }

此外，我在RecyclerViewAdapter中编写了一个方法来更新列表：

public void updateList(List<Company> list){
        companies = new ArrayList<>();
        companies.addAll(list);
        notifyDataSetChanged();
    }

我在做什么错了？

Answer 1

     @Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    menu.clear();
    inflater.inflate(R.menu.search_menu, menu);
    // Associate searchable configuration with the SearchView
    SearchManager searchManager = (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE);
    searchView = (SearchView) menu.findItem(R.id.action_search)
            .getActionView();
    searchView.setSearchableInfo(searchManager
            .getSearchableInfo(getActivity().getComponentName()));
    searchView.setMaxWidth(Integer.MAX_VALUE);
    // listening to search query text change
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            // filter recycler view when query submitted
            getFilter().filter(query);
            return false;
        }

        @Override
        public boolean onQueryTextChange(String query) {
            // filter recycler view when text is changed
            getFilter().filter(query);
            return false;
        }
    });

    super.onCreateOptionsMenu(menu, inflater);
}

我无法使用SearchView对RercyclerView列表进行排序

1 个答案: