Firebase Cloud Firestore

Anand Kashyap

6 December 2019

In this blog, we will learn about how we can use Firebase Cloud Firestore in our android application.

Step 1: Create a Firebase project

– If you have already integrated Firebase in your application then kindly ignore Step 1 – Step 4 and start with the integrating Firebase Firestore in our Android app.

-First, we need to open Firebase console to configure with our app click here to go to Firebase console and login with your account.

-Make your project on click on Add project fill your project name and tick the terms and Conditions.

Step 2: Register your app with Firebase

-Now register your app with firebase.

– An application ID is sometimes referred to as a package name.

– Find this application ID in your module (app-level) Gradle file, usually app/build.gradle (example ID: com.yourcompany.yourproject).

Note: SHA-1 information is required by Firebase Authentication (when using Google Sign In or phone number sign in) and Firebase Dynamic Links.

– Click on the Register app.

Step 3: Add a Firebase configuration file

– Add the Firebase Android configuration file to your app:

– Download the google-services.json file and add it to your project.

– Copy that google-services.json and simply paste into your module (app-level) directory of your app.

– Here we got the dependencies to add in your root-level (project-level) Gradle file (build.gradle), add rules to include the Google Services plugin. Check that you have Google’s Maven repository, as well.

– In your module (app-level) Gradle file (usually app/build.gradle), add a line to the bottom of the file.

Now you can build your Gradle.

Step 4: Verification

– Now run your project and Firebase will verify that and will complete your configuration.

– Now we can use Firebase Cloud Firestore.

Step 5: Configuration of FireStore

– Add the cloud Firestore Android library to your app/build.gradle file:

<span class="pln">implementation </span><span class="str">'com.google.firebase:firebase-firestore:20.1.0'</span>

1	<span class="pln">implementation </span><span class="str">'com.google.firebase:firebase-firestore:20.1.0'</span>

Step 6: Initialize FireStore

//Access a Cloud Firestore instance from your Activity.
FirebaseFirestore db = FirebaseFirestore.getInstance();

1 2	//Access a Cloud Firestore instance from your Activity. FirebaseFirestore db = FirebaseFirestore.getInstance();

For example:-

public class MainActivity extends AppCompatActivity {

    FirebaseFirestore db;

    private static final String NAME_KEY = "Name";
    private static final String EMAIL_KEY = "Email";
    private static final String PHONE_KEY = "Phone";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        db = FirebaseFirestore.getInstance();
    }
}

public class MainActivity extends AppCompatActivity {

FirebaseFirestore db;

private static final String NAME_KEY = "Name";

private static final String EMAIL_KEY = "Email";

private static final String PHONE_KEY = "Phone";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

db = FirebaseFirestore.getInstance();

}

How to add something in the database:

Add Data to Firestore :

private void addData() {
        Map < String, String > data = new HashMap < > ();
        newContact.put(NAME_KEY, "Roman");
        newContact.put(EMAIL_KEY, "Roman@gmail.com");
        newContact.put(PHONE_KEY, "090-8808-000");
        db.collection("UsersDatabase").document("Users").set(data)
            .addOnSuccessListener(new OnSuccessListener < Void > () {
                @Override
                public void onSuccess(Void aVoid) {
                    Toast.makeText(MainActivity.this, "User Registered",
                        Toast.LENGTH_SHORT).show();
                }
            })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Toast.makeText(MainActivity.this, "ERROR" + e.toString(),
                        Toast.LENGTH_SHORT).show();
                    Log.d("TAG", e.toString());
                }
            });

private void addData() {

Map < String, String > data = new HashMap < > ();

newContact.put(NAME_KEY, "Roman");

newContact.put(EMAIL_KEY, "Roman@gmail.com");

newContact.put(PHONE_KEY, "090-8808-000");

db.collection("UsersDatabase").document("Users").set(data)

.addOnSuccessListener(new OnSuccessListener < Void > () {

@Override

public void onSuccess(Void aVoid) {

Toast.makeText(MainActivity.this, "User Registered",

Toast.LENGTH_SHORT).show();

}

})

.addOnFailureListener(new OnFailureListener() {

@Override

public void onFailure(@NonNull Exception e) {

Toast.makeText(MainActivity.this, "ERROR" + e.toString(),

Toast.LENGTH_SHORT).show();

Log.d("TAG", e.toString());

}

});

Note:- Don’t forget to define the secure rules database. Like I am using test mode for testing and you can change it as per your requirement.

How to Retrieve something in the database:

Retrieve Data from Firestore :

private void readData() {
    DocumentReference user = db.collection("UsersDatabase").document("Users");
    user.get().addOnCompleteListener(new OnCompleteListener < DocumentSnapshot > () {
            @Override
            public void onComplete(@NonNull Task < DocumentSnapshot > task) {
                if (task.isSuccessful()) {
                    DocumentSnapshot doc = task.getResult();
                    String name = doc.get("Name");
                    String email = doc.get("Email"));
                    String number = doc.get("Phone"));
                }
            }
        })
        .addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
            }
        });
}

private void readData() {

DocumentReference user = db.collection("UsersDatabase").document("Users");

user.get().addOnCompleteListener(new OnCompleteListener < DocumentSnapshot > () {

@Override

public void onComplete(@NonNull Task < DocumentSnapshot > task) {

if (task.isSuccessful()) {

DocumentSnapshot doc = task.getResult();

String name = doc.get("Name");

String email = doc.get("Email"));

String number = doc.get("Phone"));

}

})

.addOnFailureListener(new OnFailureListener() {

@Override

public void onFailure(@NonNull Exception e) {

}

});

}