Using Java to interact with Firebase in Android

Using Java to
interact with
Firebase in
Android
Magda Miu
@magdamiu

What is Firebase?
Build better
apps
Improve app
quality
Grow your
business

Firebase works across platforms
iOS Android Web C++ Unity

GDG Pitesti App
1. Authentication using Google Sign-In
2. Get the events from Cloud Firestore
3. Receive notifications
4. Detect and solve issues

Connect your app to the Firebase project

Agenda
Firebase
Authentication
Firebase
Cloud Firestore
Firebase
Cloud Messaging
Firebase
Crashlytics

Firebase Authentication
● Email & password
● Google, Facebook, Twitter,
and GitHub sign-in
● Phone number

//project level
dependencies {
classpath 'com.android.tools.build:gradle:3.2.1'
classpath 'com.google.gms:google-services:4.0.1'
...
}
//app level
implementation 'com.google.firebase:firebase-auth:16.0.5'
implementation 'com.google.android.gms:play-services-auth:16.0.1'
apply plugin: 'com.google.gms.google-services'

GoogleSignInOptions gso = new GoogleSignInOptions
.Builder(GoogleSignInOptions
.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();

GoogleSignInClient mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
FirebaseAuth mAuth = FirebaseAuth.getInstance();

Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);

//onActivityResult
if (requestCode == RC_SIGN_IN) {
Task<GoogleSignInAccount> task = GoogleSignIn.
getSignedInAccountFromIntent(data);
try {
GoogleSignInAccount account = task.getResult(ApiException.class);
firebaseAuthWithGoogle(account);
} catch (ApiException e) {
Logging.show(TAG, "Google sign in failed", e);
}
}

//firebaseAuthWithGoogle
AuthCredential credential = GoogleAuthProvider.
getCredential(acct.getIdToken(), null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) { //… } else { //… }
}
});

<uses-permission android:name="android.permission.INTERNET" />

Firebase Cloud Firestore
● NoSQL database built for
global apps
● Query and structure data the
way you like
● Build truly serverless apps
● Sync data across devices, on
or offline
● Scale globally
● Strong user-based security

Firebase Cloud Firestore v/s Firebase
Realtime Database
● Different data structure
● Better querying on FS
● Scalability
● Pricing
● Security
● Write batch

FirebaseFirestore mFirebaseFirestore = FirebaseFirestore.getInstance();

mFirebaseFirestore.collection(FirestorePath.EVENTS)
.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
for (QueryDocumentSnapshot document : task.getResult()) {
mEvents.add(parseData(document));
}
} else {
Log.w(TAG, "Error getting documents.", task.getException());
}
}
});

mFirebaseFirestore.collection(FirestorePath.EVENTS)
.add(eventMap)
.addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
@Override
public void onSuccess(DocumentReference documentReference) { }
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) { }
});

Firebase Cloud Messaging
● Send messages to any device
● Advanced message targeting
● Customized notification
content
● No coding required for
sending notifications

implementation 'com.google.firebase:firebase-messaging:17.3.4'

public class FirebaseImplementation extends FirebaseMessagingService {
@Override
public void onNewToken(String s) {
super.onNewToken(s);
}
@Override
public void onMessageReceived(RemoteMessage message) {
sendMyNotification(message.getNotification().getBody());
}
...

FirebaseMessaging.getInstance().setAutoInitEnabled(true);
FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener(MainAc
tivity.this, new
OnSuccessListener<InstanceIdResult>() {
@Override
public void onSuccess(InstanceIdResult instanceIdResult) {
String newToken = instanceIdResult.getToken();
}
});

FirebaseMessaging.getInstance().subscribeToTopic("the_topic")
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) { }
});

Firebase Crashlytics
● Powerful, real time crash
reporting
● Quickly pinpoint the root
cause of crashes
● Understand what issue to
tackle first
● Never miss a critical crash
+

maven {
url 'https://maven.fabric.io/public'
}
classpath 'io.fabric.tools:gradle:1.26.1'
implementation 'com.crashlytics.sdk.android:crashlytics:2.9.5'
implementation('com.crashlytics.sdk.android:crashlytics:2.9.5@aar') {
transitive = true;
}
<meta-data
android:name="io.fabric.ApiKey"
android:value="the_value_etc" />

Fabric.with(this, new Crashlytics());
Crashlytics.getInstance().crash(); // Force a crash

Resources
● https://firebase.google.com/
● https://codelabs.developers.g
oogle.com/
● https://firebase.google.com/
docs/guides/

Thank you!
Magda Miu
@magdamiu

Using Java to interact with Firebase in Android

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