使用 recyclerview 搜索不起作用 - Android

Question

您好，我正在尝试按用户名进行搜索，数据位于列出所有用户的 recyclerview 中，但是当写入时没有任何反应，我该如何解决？我相信我做错了什么，但我真的不知道如何让它发挥作用。

我在网上看到了一些教程，但我无法实现

public class FindFriendsActivity extends AppCompatActivity
{
    private Toolbar mToolbar;
    private RecyclerView FindFriendsRecyclerList;
    private DatabaseReference UsersRef;
    private MaterialSearchView searchView;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_find_friends);


        UsersRef = FirebaseDatabase.getInstance().getReference().child("Users");


        FindFriendsRecyclerList = (RecyclerView) findViewById(R.id.find_friends_recycler_list);
        FindFriendsRecyclerList.setLayoutManager(new LinearLayoutManager(this));


        mToolbar = (Toolbar) findViewById(R.id.find_friends_toolbar);
        setSupportActionBar(mToolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setTitle("Find Friends");
        searchView = findViewById(R.id.materialSearchPrincipal);
        searchView.setOnQueryTextListener(new MaterialSearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {

                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {





                return true;
            }
        });
    }


    @Override
    protected void onStart()
    {
        super.onStart();

        FirebaseRecyclerOptions<Contacts> options =
                new FirebaseRecyclerOptions.Builder<Contacts>()
                .setQuery(UsersRef, Contacts.class)
                .build();

        FirebaseRecyclerAdapter<Contacts, FindFriendViewHolder> adapter =
                new FirebaseRecyclerAdapter<Contacts, FindFriendViewHolder>(options) {
                    @Override
                    protected void onBindViewHolder(@NonNull FindFriendViewHolder holder, final int position, @NonNull Contacts model)
                    {
                        holder.userName.setText(model.getName());
                        holder.userStatus.setText(model.getStatus());
                        Picasso.get().load(model.getImage()).placeholder(R.drawable.profile_image).into(holder.profileImage);


                        holder.itemView.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View view)
                            {
                                String visit_user_id = getRef(position).getKey();

                                Intent profileIntent = new Intent(FindFriendsActivity.this, ProfileActivity.class);
                                profileIntent.putExtra("visit_user_id", visit_user_id);
                                startActivity(profileIntent);
                            }
                        });
                    }

                    @NonNull
                    @Override
                    public FindFriendViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i)
                    {
                        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.users_display_layout, viewGroup, false);
                        FindFriendViewHolder viewHolder = new FindFriendViewHolder(view);
                        return viewHolder;
                    }
                };

        FindFriendsRecyclerList.setAdapter(adapter);

        adapter.startListening();
    }



    public static class FindFriendViewHolder extends RecyclerView.ViewHolder
    {
        TextView userName, userStatus;
        CircleImageView profileImage;


        public FindFriendViewHolder(@NonNull View itemView)
        {
            super(itemView);

            userName = itemView.findViewById(R.id.user_profile_name);
            userStatus = itemView.findViewById(R.id.user_status);
            profileImage = itemView.findViewById(R.id.users_profile_image);
        }
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        super.onCreateOptionsMenu(menu);

        getMenuInflater().inflate(R.menu.options_menu, menu);
        MenuItem item = menu.findItem(R.id.menuPesquisa);
        searchView.setMenuItem(item);

        return true;
    }

}

Answer 1

您可以像这样从您的searchView 搜索，例如它正在搜索title 上的匹配项

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

            @Override
            public boolean onQueryTextChange(String s) {

                Query query = FirebaseDatabase.getInstance()
                        .getReference()
                        .child("posts").orderByChild("title").equalTo(s);

                if(s.equals("")){
                    query = FirebaseDatabase.getInstance()
                            .getReference()
                            .child("posts");
                }

                fetch(query);

                return false;
            }
        });


private void fetch(Query query) {

        FirebaseRecyclerOptions<Model> options =
                new FirebaseRecyclerOptions.Builder<Model>()
                        .setQuery(query, new SnapshotParser<Model>() {
                            @NonNull
                            @Override
                            public Model parseSnapshot(@NonNull DataSnapshot snapshot) {
                                return new Model(snapshot.child("id").getValue().toString(),
                                        snapshot.child("title").getValue().toString(),
                                        snapshot.child("desc").getValue().toString());
                            }
                        })
                        .build();

        adapter = new CustomFirebaseRecylerAdapter<Model, CustomFirebaseRecylerAdapter.ViewHolder>(options);
        adapter.startListening();
        recyclerView.setAdapter(adapter);
    }

Find full project source code here