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使用RecyclerView的SearchView过滤器(SearchView filter with RecyclerView)

 我试图用Fragment中的建议（过滤器）实现SearchView，但我没有管理它。 我尝试了几乎所有的教程，但没有为我工作。 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" />
 
 分段  
@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);
        }

    }

}

I have tried to implement a SearchView with suggestions (filter) in Fragment, but I have not managed it. I tried almost every tutorial but nothing worked for me. I would appreciate any help. Thank you 
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" />
 
Fragment 
@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;
 
Adapter 
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);
        }

    }

}

原文：https://stackoverflow.com/questions/38098390

更新时间：2022-06-30 11:06

最满意答案

 web2py在数据库事务中包装每个HTTP请求。 如果请求期间发生异常，则将回滚事务。 否则，在请求结束时，在返回响应之前，事务将被提交（因此将在那时提交所有插入/更新操作）。  
 如果在应用程序代码中显式调用db.commit() ，则事务将立即提交，而不是等到请求结束。 任何后续操作都将成为新交易的一部分。  
 在上述两种情况下，所有更新都将同时提交。 唯一的区别是，在第一种情况下，提交将在返回HTTP响应之前由框架发出（假设没有中间异常触发回滚），在第二种情况下，提交在运行后立即发生更新循环。  
 在选项2中，如果您在循环中移动了db.commit()调用，那么确实会一次提交一个更新，而不是一次提交所有更新。  
 另请注意，要更新记录，您无需先选择它，如果要将同一更新应用于多个记录，则无需一次更新一条记录，而是将更新应用于表示所有记录的DAL Set对象：  
db(db.people.id > 0).update(name='Bob')
 
 上面定义了db.people表中的一组记录（在本例中是所有记录），然后更新所有这些记录的“name”字段。 此操作不涉及从数据库中选择的任何记录。 

web2py wraps each HTTP request in a database transaction. If there is an exception during the request, the transaction will be rolled back. Otherwise, at the end of the request, just before returning the response, the transaction is committed (so all insert/update operations will be committed at that time). 
If you explicitly call db.commit() in the application code, then the transaction will be committed immediately rather than waiting until the end of the request. Any subsequent operations will be part of a new transaction. 
In both cases above, all of the updates will be committed at the same time. The only difference is that in the first case, the commit will be issued by the framework right before returning the HTTP response (assuming there is no intervening exception that triggers a rollback), and in the second case, the commit happens immediately after running through the loop of updates. 
In option 2, if you moved the db.commit() call inside the loop, then the updates would indeed be committed one at a time rather than all at once. 
Also, note that to update a record, you do not need to first select it, and if you want to apply the same update to many records, you don't need to update one record at a time but would instead apply the update to a DAL Set object representing all the records: 
db(db.people.id > 0).update(name='Bob')
 
The above defines a set of records in the db.people table (in this case, all the records) and then updates the "name" field of all of those records. This operation does not involve any records being selected from the database.

使用RecyclerView的SearchView过滤器(SearchView filter with RecyclerView)

最满意答案

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