Firebase database query unexpectedly returns nothing

Question

I was trying to get some data from my Firebase realtime-database as followed generally, but couldn't figure out where the problem is.

The following Toast statement returns with nothing, somehow that populateViewHolder is not working! Where might the problem be?

The code is here:

package com.example.abed.smit;

import android.annotation.SuppressLint;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.Toolbar;

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

public class FindDocActivity extends AppCompatActivity {


private ImageView searchbtn;
private EditText searchInput;

private RecyclerView searchResulist;

private DatabaseReference allusersDatabaseref;

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

    searchResulist= findViewById(R.id.search_result_list1);
    searchResulist.setHasFixedSize(true);
    searchResulist.setLayoutManager(new LinearLayoutManager(this));

    searchbtn=(ImageView)findViewById(R.id.search_people_btn1);

    searchInput=(EditText)findViewById(R.id.Search_box_input1);

    allusersDatabaseref= FirebaseDatabase.getInstance().getReference().child("BMDC").child("01");

    searchbtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String searchBoxInput = searchInput.getText().toString();
            SearchPropleAnddonnor(searchBoxInput);
        }
    });
}

private void SearchPropleAnddonnor(String searchBoxInput) {

    Toast.makeText(this,"Searching..",Toast.LENGTH_LONG).show();

    Query searchpeopleBloodquery=allusersDatabaseref.orderByChild("ID")
            .startAt(searchBoxInput).endAt(searchBoxInput+"\uf8ff");
   FirebaseRecyclerAdapter<FindDoctors,FindBloodViewHolder>firebaseRecyclerAdapter=
            new FirebaseRecyclerAdapter<FindDoctors, FindBloodViewHolder>
                    (
                            FindDoctors.class,
                            R.layout.all_userdoc_display_layout,
                            FindBloodViewHolder.class,
                            searchpeopleBloodquery
                    ) {
                @Override
                protected void populateViewHolder(FindBloodViewHolder viewHolder, FindDoctors model, int position) {
                    viewHolder.setName(model.getName());
                    viewHolder.setId(model.getId());
                }
            };

    searchResulist.setAdapter(firebaseRecyclerAdapter);

}

public static class FindBloodViewHolder extends RecyclerView.ViewHolder{

    View mView;

    public FindBloodViewHolder(View itemView ) {
        super(itemView);
        mView=itemView;
    }

    public void setName(String name){

        TextView myname=(TextView)mView.findViewById(R.id.all_user_profile_name1);
        myname.setText(name);

    }

    public void setId(String id){

        TextView mystatus=(TextView)mView.findViewById(R.id.all_user_profile_status1);
        mystatus.setText(id);

    }

}
}

I used getter setter:

package com.example.abed.smit;

public class FindDoctors {

    public String id , name;

    public FindDoctors(String id, String name) {
        this.id = id;
        this.name = name;
    }

    public FindDoctors() {
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

and database

Database Structure

I used it sir .. but not working ! can u please help me sir !? — RA Hat, Jul 19 '18 at 06:36
You have no event listener attached to the the database reference. Calling the method `addListenerForSingleValueEvent` for the database reference should help. — Shababb Karim, Jul 19 '18 at 06:39
**[This](https://stackoverflow.com/questions/49383687/how-can-i-retrieve-data-from-firebase-to-my-adapter/49384849)** is a recommended way in which you can retrieve data from a Firebase Realtime database and display it in a `RecyclerView` using `FirebaseRecyclerAdapter`. — Alex Mamo, Jul 19 '18 at 08:30

Raj · Accepted Answer · 2018-07-19T08:59:08.517

0

private void SearchDoc(String searchBoxInput1) {
    Toast.makeText(this, "searching..", Toast.LENGTH_LONG).show();

    Query searchdoctorquery = allDocdatabaseref.orderByChild("name").startAt(searchBoxInput1).endAt(searchBoxInput1 + "\uf8ff");


    firebaseRecyclerAdapter
                = new FirebaseRecyclerAdapter<FindDoctors, FindDoctorsViewHolder>(
                FindDoctors.class,
                R.layout.all_userdoc_display_layout,
                FindDoctorsViewHolder.class,
                searchdoctorquery

        ) {
            @Override
            protected void populateViewHolder(FindDoctorsViewHolder viewHolder, FindDoctors model, int position) {
                /// Toast.makeText(getApplicationContext(),model.getName().toString(), Toast.LENGTH_LONG).show();

                viewHolder.setbmdc(model.getbmdc());
                viewHolder.setName(model.getName());
                }
        };
        SearchResult_doc.setAdapter(firebaseRecyclerAdapter);
        firebaseRecyclerAdapter.startListening();
    }

edited Jul 19 '18 at 08:59

answered Jul 19 '18 at 06:37

Raj

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I can provide more exact answer, if you can share your database structure. @AB ED – Raj Jul 19 '18 at 06:38
If your error is resolved, you should accept my answer by checking the green tick icon on left side of my answer. – Raj Jul 19 '18 at 06:53
#Raj sir , i do it in a same project nd that work is working but this is not working in the same project.. – RA Hat Jul 19 '18 at 06:57
In FindDocActivity class. – Raj Jul 19 '18 at 07:10

Firebase database query unexpectedly returns nothing

1 Answers1