How to use Android Firestore Database whereEqualTo Query

In this android programming source code example, we are going to explore how to use Android Firestore Database whereEqualTo Query.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to chain Android Firestore Database Query.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="15dp"
    android:background="#CACACA">

    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="title"
        android:textSize="20sp"
        android:layout_marginTop="90dp"/>

    <View
        android:id="@+id/view1"
        android:layout_width="match_parent"
        android:layout_height="2sp"
        android:layout_below="@id/title"
        android:background="@color/colorAccent"/>

    <TextView
        android:id="@+id/body"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="body"
        android:textSize="30sp"
        android:layout_below="@id/view1"/>

</RelativeLayout>

MainActivity.java

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import com.bluapp.androidview2.R;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.Query;
import com.google.firebase.firestore.QuerySnapshot;

public class FirestoreActivity22 extends AppCompatActivity {
    private TextView title;
    private TextView body;
    private FirebaseFirestore mDatabase;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_firestore22);
        title = (TextView)findViewById(R.id.title);
        body = (TextView)findViewById(R.id.body);
        mDatabase = FirebaseFirestore.getInstance();
        Query query = mDatabase.collection("AndroidView").whereEqualTo("title","hello");
        query.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if(task.isSuccessful()){
                    QuerySnapshot queryDocumentSnapshots = task.getResult();
                    for(DocumentSnapshot readData: queryDocumentSnapshots.getDocuments()){
                        title.setText(readData.get("title").toString());
                        body.setText(readData.get("body").toString());
                    }

                }
            }
        })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(FirestoreActivity22.this,e.getMessage(),Toast.LENGTH_LONG).show();
                        Log.d("Androidview", e.getMessage());
                    }
                });
    }
}

app/build.gradle

implementation 'com.google.firebase:firebase-core:16.0.9'
implementation 'com.google.firebase:firebase-firestore:19.0.0'

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