Firebase en tiempo real la base de datos de búsqueda por palabra en medio de la consulta?

Atif Pervaiz:

En mi solicitud, tengo una base de datos en tiempo real en Firebase que contiene el título, imagen, descripción, Búsqueda (un campo adicional que no aparece en la aplicación sino que se utiliza contiene el texto de título con letras mayúsculas pequeñas y refinar la búsqueda sensible a mayúsculas). Actualmente cuando escribo consulta mismo con el mismo, ya sea en pequeña caja o de capital o con la mezcla de ambos que busca perfecto, pero cuando escribo alguna palabra que se encuentra entre la consulta no funciona Por ejemplo, si la consulta es "Este es larga título" cuando tecleo 'largo' no muestra nada. Estoy atascado ayuda que resolver esto.

He utilizado ui base de fuego de biblioteca:

implementation 'com.firebaseui:firebase-ui-database:4.2.0'

Base de datos en tiempo real Captura de pantalla:

Aquí está mi código de actividad:

package com.blogspot.atifsoftwares.firebaseproject;

import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.support.annotation.NonNull;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;

import java.io.ByteArrayOutputStream;

public class PostsListActivity extends AppCompatActivity {

    LinearLayoutManager mLayoutManager; //for sorting
    SharedPreferences mSharedPref; //for saving sort settings
    RecyclerView mRecyclerView;
    FirebaseDatabase mFirebaseDatabase;
    DatabaseReference mRef;

    FirebaseRecyclerAdapter<Model, ViewHolder> firebaseRecyclerAdapter;
    FirebaseRecyclerOptions<Model> options;

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

        //Actionbar
        ActionBar actionBar = getSupportActionBar();
        //set title
        mSharedPref = getSharedPreferences("SortSettings", MODE_PRIVATE);
        String mSorting = mSharedPref.getString("Sort", "newest"); //where if no settingsis selected newest will be default

        if (mSorting.equals("newest")) {
            mLayoutManager = new LinearLayoutManager(this);
            //this will load the items from bottom means newest first
            mLayoutManager.setReverseLayout(true);
            mLayoutManager.setStackFromEnd(true);
        } else if (mSorting.equals("oldest")) {
            mLayoutManager = new LinearLayoutManager(this);
            //this will load the items from bottom means oldest first
            mLayoutManager.setReverseLayout(false);
            mLayoutManager.setStackFromEnd(false);
        }

        //RecyclerView
        mRecyclerView = findViewById(R.id.recyclerView);
        mRecyclerView.setHasFixedSize(true);

        //send Query to FirebaseDatabase
        mFirebaseDatabase = FirebaseDatabase.getInstance();
        mRef = mFirebaseDatabase.getReference("Data");

        showData();
    }

    //show data
    private void showData(){
        options = new FirebaseRecyclerOptions.Builder<Model>().setQuery(mRef, Model.class).build();

        firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Model, ViewHolder>(options) {
            @Override
            protected void onBindViewHolder(@NonNull ViewHolder holder, int position, @NonNull Model model) {
                holder.setDetails(getApplicationContext(), model.getTitle(), model.getDescription(), model.getImage());
            }

            @NonNull
            @Override
            public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                //Inflating layout row.xml
                View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.row, parent, false);

                ViewHolder viewHolder = new ViewHolder(itemView);
                //item click listener
                viewHolder.setOnClickListener(new ViewHolder.ClickListener() {
                    @Override
                    public void onItemClick(View view, int position) {
                        //get data from firebase at the position clicked
                        String mTitle = getItem(position).getTitle();
                        String mDesc = getItem(position).getDescription();
                        String mImage = getItem(position).getImage();

                        //pass this data to new activity
                        Intent intent = new Intent(view.getContext(), PostDetailActivity.class);
                        intent.putExtra("title", mTitle); // put title
                        intent.putExtra("description", mDesc); //put description
                        intent.putExtra("image", mImage); //put image url
                        startActivity(intent); //start activity
                    }

                    @Override
                    public void onItemLongClick(View view, int position) {
                        //Todo implement you on long click functionality here
                    }
                });

                return viewHolder;
            }
        };

        //set layout as LinearLayout
        mRecyclerView.setLayoutManager(mLayoutManager);
        firebaseRecyclerAdapter.startListening();
        //set adapter to firebase recycler view
        mRecyclerView.setAdapter(firebaseRecyclerAdapter);
    }

    //search data
    private void firebaseSearch(String searchText) {

        //convert string entered in SearchView to lowercase
        String query = searchText.toLowerCase();

        Query firebaseSearchQuery = mRef.orderByChild("search").startAt(query).endAt(query + "\uf8ff");


        options = new FirebaseRecyclerOptions.Builder<Model>().setQuery(firebaseSearchQuery, Model.class).build();

        firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Model, ViewHolder>(options) {
            @Override
            protected void onBindViewHolder(@NonNull ViewHolder holder, int position, @NonNull Model model) {
                holder.setDetails(getApplicationContext(), model.getTitle(), model.getDescription(), model.getImage());
            }

            @NonNull
            @Override
            public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                //Inflating layout row.xml
                View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.row, parent, false);

                ViewHolder viewHolder = new ViewHolder(itemView);
                //item click listener
                viewHolder.setOnClickListener(new ViewHolder.ClickListener() {
                    @Override
                    public void onItemClick(View view, int position) {
                        //get data from firebase at the position clicked
                        String mTitle = getItem(position).getTitle();
                        String mDesc = getItem(position).getDescription();
                        String mImage = getItem(position).getImage();

                        //pass this data to new activity
                        Intent intent = new Intent(view.getContext(), PostDetailActivity.class);
                        intent.putExtra("title", mTitle); // put title
                        intent.putExtra("description", mDesc); //put description
                        intent.putExtra("image", mImage); //put image url
                        startActivity(intent); //start activity
                    }

                    @Override
                    public void onItemLongClick(View view, int position) {
                        //Todo implement you on long click functionality here
                    }
                });

                return viewHolder;
            }
        };

        //set layout as LinearLayout
        mRecyclerView.setLayoutManager(mLayoutManager);
        firebaseRecyclerAdapter.startListening();
        //set adapter to firebase recycler view
        mRecyclerView.setAdapter(firebaseRecyclerAdapter);

    }


    //load data into recycler view onStart
    @Override
    protected void onStart() {
        super.onStart();
        if (firebaseRecyclerAdapter !=null){
            firebaseRecyclerAdapter.startListening();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //inflate the menu; this adds items to the action bar if it present
        getMenuInflater().inflate(R.menu.menu, menu);
        MenuItem item = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                firebaseSearch(query);
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                //Filter as you type
                firebaseSearch(newText);
                return false;
            }
        });
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        //handle other action bar item clicks here
        if (id == R.id.action_sort) {
            //display alert dialog to choose sorting
            showSortDialog();
            return true;
        }
        if (id == R.id.action_add) {
            //start Add Post Activity
            startActivity(new Intent(PostsListActivity.this, AddPostActivity.class));
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void showSortDialog() {
        //options to display in dialog
        String[] sortOptions = {" Newest", " Oldest"};
        //create alert dialog
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Sort by") //set title
                .setIcon(R.drawable.ic_action_sort) //set icon
                .setItems(sortOptions, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // The 'which' argument contains the index position of the selected item
                        // 0 means "Newest" and 1 means "oldest"
                        if (which == 0) {
                            //sort by newest
                            //Edit our shared preferences
                            SharedPreferences.Editor editor = mSharedPref.edit();
                            editor.putString("Sort", "newest"); //where 'Sort' is key & 'newest' is value
                            editor.apply(); // apply/save the value in our shared preferences
                            recreate(); //restart activity to take effect
                        } else if (which == 1) {
                            {
                                //sort by oldest
                                //Edit our shared preferences
                                SharedPreferences.Editor editor = mSharedPref.edit();
                                editor.putString("Sort", "oldest"); //where 'Sort' is key & 'oldest' is value
                                editor.apply(); // apply/save the value in our shared preferences
                                recreate(); //restart activity to take effect
                            }
                        }
                    }
                });
        builder.show();
    }

}

Alex Mamo :

cuando escribo alguna palabra que se encuentra entre la consulta no funciona

Esto sucede porque Firebase qué no admite la indexación nativa o la búsqueda de campos de texto en las propiedades de base de datos. Además, la descarga de un nodo completo para buscar campos del lado del cliente no es práctico en absoluto. Para habilitar la búsqueda de texto completo de los datos de base de datos en tiempo real base de fuego, le recomiendo que utilice un servicio de búsqueda de terceros, como Algolia o Elasticsearch .

Este es un ejemplo de cómo se trabaja con la nube Firestore pero de la misma manera que se puede utilizar con la base de datos en tiempo real Firebase.