Question

我尝试在Fragment中使用建议（过滤器）实现SearchView，但我还没有管理它。我几乎尝试了每个教程，但没有任何方法适合我。我将不胜感激任何帮助。谢谢

XML ...

    <!--appBar layout-->
    <android.support.design.widget.AppBarLayout
        android:id="@+id/appBarLayout"
        android:fitsSystemWindows="true"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize">

        <!--searchView layout-->
        <android.support.v7.widget.SearchView
            android:id="@+id/search_view"
            app:layout_scrollFlags="scroll|enterAlways"
            android:iconifiedByDefault="false"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:closeIcon="@drawable/ic_clear_white_18dp"
            app:searchIcon="@drawable/ic_search_white_24dp"
            app:queryHint="@string/search_contact"
            app:iconifiedByDefault="false"
            android:background="@color/colorPrimary"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />

       </android.support.design.widget.AppBarLayout>

        <!-- recycler view-->
        <android.support.v7.widget.RecyclerView
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

片段

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

        searchView = (SearchView)view.findViewById(R.id.search_view);
        fabButton = (FloatingActionButton)view.findViewById(R.id.fab_button);

        //recycler view
        recyclerView = (RecyclerView)view.findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
        contacts = SugarRecord.listAll(Contact.class);
        contactsAdapter = new ContactsAdapter(getActivity(), contacts);
        recyclerView.setAdapter(contactsAdapter);

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                // TODO: setFilter

                return true;
            }
        });

        return view;

适配器

public class ContactsAdapter extends RecyclerView.Adapter<ContactsAdapter.ContactVH> {

    List<Contact> mContact;
    List<Contact> mContactFilter;

    Context mContext;

    public ContactsAdapter(Context context, List<Contact> contact) {
        this.mContact = contact;
        this.mContext = context;
    }

    @Override
    public ContactVH onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_item_contact, parent, false);
        ContactVH viewHolder = new ContactVH(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ContactVH holder, int position) {
        holder.name.setText(mContact.get(position).getName());
    }

    @Override
    public int getItemCount() {
        return mContact.size();
    }

    class ContactVH extends RecyclerView.ViewHolder {
        @BindView(R.id.contact_name)
        TextView name;

        public ContactVH(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }

    }

}

Answer 1

您可以创建扩展过滤器

的类

class YourFilterClass extends Filter {

private List<Contact> contactList;
private List<Contact> filteredContactList;
private ContactsAdapter adapter;

    public YourFilterClass(List<Contact> contactList, ContactsAdapter adapter) {
     this.adapter = adapter;
     this.contactList = contactList;
     this.filteredContactList = new ArrayList();
    }

    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
    filteredContactList.clear();
    final FilterResults results = new FilterResults();

    //here you need to add proper items do filteredContactList
     for (final Contact item : contactList) {
            if (item.getName().toLowerCase().trim().contains("pattern")) { 
                filteredContactList.add(item);
            }
        }

        results.values = filteredContactList;
        results.count = filteredContactList.size();
        return results;
    }

    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
        adapter.setList(filteredContactList);
        adapter.notifyDataSetChanged();
    }

}

然后您可以将过滤器添加到您的 ContactsAdapter 。

public class ContactsAdapter extends RecyclerView.Adapter<ContactsAdapter.ContactVH> {

List<Contact> mContact;
List<Contact> mContactFilter;
YourFilterClass filter;

Context mContext;

public ContactsAdapter(Context context, List<Contact> contact) {
    this.mContact = contact;
    this.mContactFilter = contact;
    this.mContext = context;
    filter = new YourFilterClass(mContact, this);
}

@Override
public ContactVH onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_item_contact, parent, false);
    ContactVH viewHolder = new ContactVH(view);
    return viewHolder;
}

@Override
public void onBindViewHolder(ContactVH holder, int position) {
    holder.name.setText(mContactFilter.get(position).getName());
}
// set adapter filtered list
public void setList(List<Contact> list) {
    this.mContactFilter = list;
}
//call when you want to filter
public void filterList(String text) {
    filter.filter(text);
}

@Override
public int getItemCount() {
    return mContactFilter.size();
}

class ContactVH extends RecyclerView.ViewHolder {
    @BindView(R.id.contact_name)
    TextView name;

    public ContactVH(View itemView) {
        super(itemView);
        ButterKnife.bind(this, itemView);
    }

}

}

Answer 2

试试这个

private List<Category> categoryList;
private List<Category> mFilteredList;


public CategoryAdapter(List<Category> categoryList) {

    this.categoryList = categoryList;
    this.mFilteredList = categoryList;
}

@Override
public CategoryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.category_card, parent, false);

    return new CategoryViewHolder(itemView);
}

@Override
public void onBindViewHolder(CategoryViewHolder holder, int position) {
        Category category = mFilteredList.get(position);
        holder.catname.setText(category.getCatName());
        holder.items.setText(category.getCatItems()+" Items");


}

@Override
public int getItemCount() {
    return mFilteredList.size();
}

@Override
public Filter getFilter() {
    return new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence charSequence) {

            String charString = charSequence.toString();
            if (charString.isEmpty()) {

                mFilteredList = categoryList;
            } else {

                List<Category> filteredList = new ArrayList<>();

                for (Category category : categoryList) {

                    if (category.getCatName().toLowerCase().contains(charString) || String.valueOf(category.getId()).contains(charString)) {

                        filteredList.add(category);
                    }
                }

                mFilteredList = filteredList;
            }

            FilterResults filterResults = new FilterResults();
            filterResults.values = mFilteredList;
            return filterResults;
        }

        @Override
        protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
            mFilteredList = (List<Category>) filterResults.values;
            notifyDataSetChanged();
        }
    };
}

public class CategoryViewHolder extends RecyclerView.ViewHolder {
    public TextView catname, items;
    public ImageView imgView;

    public CategoryViewHolder(View view) {
        super(view);
        catname = view.findViewById(R.id.categorycard_cate_name);
        items = view.findViewById(R.id.categorycard_lbl_cat_items);

    }
}

public void removeItem(int position) {
    mFilteredList.remove(position);
    // notify the item removed by position
    // to perform recycler view delete animations
    // NOTE: don't call notifyDataSetChanged()
    notifyItemRemoved(position);
}

public void restoreItem(Category category, int position) {
    mFilteredList.add(position, category);
    // notify item added by position
    notifyItemInserted(position);
}

实现可过滤适配器类

public class CategoryAdapter extends RecyclerView.Adapter实现了Filterable {

virtualenv venv

}

Answer 3

在您的适配器类中实现可过滤并覆盖它的方法。

import time
from bs4 import BeautifulSoup
from urllib.parse import urljoin
from selenium import webdriver
from selenium.webdriver.chrome.options import Options

# --- 

def get_links(driver, url):
    driver.get(url)
    time.sleep(5)

    soup = BeautifulSoup(driver.page_source,"lxml")

    links = []

    for new_url in soup.find_all('a', href=True):
         new_url = new_url.get('href')
         new_url = urljoin(url, new_url) 
         links.append(new_url)

    return links

# ---

options = Options()
options.add_argument('--incognito')
options.add_argument('--headless')
options.add_argument("--no-sandbox")
options.add_argument('--disable-dev-shm-usage')
options.add_argument("--profile-directory=Default")
driver = webdriver.Chrome("./chromedriver",options=options)
#driver = webdriver.Firefox()

# ---

domain = 'https://spaceflightnow.com/' # to filter external links
start_url = 'https://spaceflightnow.com/'
max_level = 2

links_visited = set([start_url])  # to test visited links
links_with_levels = [(start_url, 0)] # to control levels 

# ---

for link, level in links_with_levels:
    if level >= max_level:
        print('skip:', level, link)
        continue

    print('visit:', level, link)

    links = get_links(driver, link)

    print('found:', len(links))
    links = list(set(links) - links_visited)
    print('after filtering:', len(links))

    level += 1

    for new_link in links:
        if new_link.startswith(domain): # filter external links
            links_visited.add(new_link)
            links_with_levels.append( (new_link, level) )

# ---

for link, level in links_with_levels:
    print('skip:', level, link)

在您的主要活动中创建searchview并收听onQueryTextChange。

    @Override
public Filter getFilter() {

    Filter filter = new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence charSequence) {
            FilterResults filterResults = new FilterResults();

            if(charSequence == null | charSequence.length() == 0){
                filterResults.count = getUserModelListFiltered.size();
                filterResults.values = getUserModelListFiltered;

            }else{
                String searchChr = charSequence.toString().toLowerCase();

                List<UserModel> resultData = new ArrayList<>();

                for(UserModel userModel: getUserModelListFiltered){
                    if(userModel.getUserName().toLowerCase().contains(searchChr)){
                        resultData.add(userModel);
                    }
                }
                filterResults.count = resultData.size();
                filterResults.values = resultData;

            }

            return filterResults;
        }

        @Override
        protected void publishResults(CharSequence charSequence, FilterResults filterResults) {

            userModelList = (List<UserModel>) filterResults.values;
            notifyDataSetChanged();

        }
    };
    return filter;
}

完整的教程和源代码。 Recyclerview with search / filter

Answer 4

SearchView addCustomerPageSearchView = findViewById(R.id.addCustomerPageSearchView);
    addCustomerPageSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {

            searchResult(query);

            return true;
        }

        @Override
        public boolean onQueryTextChange(String newText) {

            searchResult(newText);

            return true;
        }
    });


    private void searchResult(String query)
    {
    String q = query.toLowerCase();
    List<ModelContacts> updatedList = new ArrayList<>();

    for (ModelContacts modelContacts : contactList)
    {
        if(modelContacts.getName().toLowerCase().contains(q))
        {
            updatedList.add(modelContacts);
        }
    }

    adapter = new ContactAdapter(getApplicationContext(), updatedList);
    contactListRecycler.setAdapter(adapter);
}

使用RecyclerView

4 个答案: