Are you looking for a realtime infrastructure
behind your mobile app?
Well, Firebase may be what you need..and even more!
DroidconIT2016 – Alessandro Martellucci

I’m Alessandro Martellucci
alex.martellucci@gmail.com
martellux
+AlessandroMartellucci
@martellux
DroidconIT2016 – Alessandro Martellucci

Open Reply
• Reply is a leading IT Services Company, with offices in Italy, Germany, UK, Benelux,
USA, Brazil, France and Poland.
• Open Reply is the company of Reply Group focused on open source software,
multichannel solutions and mobile applications.
• From Rome to Milan, our team is based on a young team of over 40 engineers 100%
focused on mobile development (iOS, Android & Windows Phone).
• We are specialised in broadcasting, banking, Android OS Customisation, IoT and
M2M.
We are hiring! Contact us at jobs@reply.eu
DroidconIT2016 – Alessandro Martellucci

Lifecycle 0.2
A binder which let you manage async operations against
Android components lifecycle
• Seamless execution async-rotation-response
• Easily integration with third-party library
• No crashes after Activity/Fragment rotation
• Fragment transaction management
martellux/Lifecycle com.martellux:lifecycle:0.2.0
DroidconIT2016 – Alessandro Martellucci

Android Programmazione Avanzata
• Multi-screen and multi device development
• Functional Programming with RxJava
• Testing & Code Mantainance
• Android Wear
• Bluetooth Classic & Low Energy
• Google Cast and Chromecast
DroidconIT2016 – Alessandro Martellucci

Agenda
1. What is Firebase
2. NoSQL JSON database
3. Demo
4. Android integration
5. Working with data
6. Working offline
7. FirebaseUI binding
8. Rules management
9. User authentication
10. Pricing
DroidconIT2016 – Alessandro Martellucci

What is Firebase
• MBaaS
• Data synchronization
• Hosting (static assets, Node.js)
• Authentication (Google, Facebook, Email & Password, Anonymous)
• Realtime database (JSON)
DroidconIT2016 – Alessandro Martellucci

NoSQL Database
• SQL & RDBMS
• JSON
• web format
• agile
• structure
• friendliness
• Drawbacks
• navigational query
• structure
DroidconIT2016 – Alessandro Martellucci

Firebase JSON
{
“event-name”:”Droidcon Italy”,
“location”: {
“latitude”:22,
“longitude”:22
},
“events”: [
{“name”: “Are you looking for a realtime…”,
“speaker”: “Alessandro Martellucci”,
“room”: “Sala Parigi”,
“time”: 000000
},
…
]
}
JSON
DroidconIT2016 – Alessandro Martellucci

Firebase Web Console
DroidconIT2016 – Alessandro Martellucci

Firebase Vulcan Console
DroidconIT2016 – Alessandro Martellucci

DroidconIT 2016 FirebaseDemo
• We’re going live
1. Download app
2. Hit your colour
3. Be patient
DroidconIT2016 – Alessandro Martellucci
Source code at https://github.com/martellux/

Android integration
• Account
• Sign with Google
• Dependecies
• Right click -> Project Structure -> Cloud -> Firebase
• Reference
• Navigation path
DroidconIT2016 – Alessandro Martellucci

Firebase setup (1/2)
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.firebase:firebase-client-android:2.5.1+’
}
android {
packagingOptions {
exclude 'META-INF/LICENSE’
exclude 'META-INF/LICENSE-FIREBASE.txt’
exclude 'META-INF/NOTICE’
}
}
Configura.on
DroidconIT2016 – Alessandro Martellucci

Firebase setup (2/2)
public class ApplicationInstance extends Application {
@Override
public void onCreate() {
super.onCreate();
Firebase.setAndroidContext(this);
}
}
Applica.on
DroidconIT2016 – Alessandro Martellucci
public class MainPresenter extends Presenter {
private Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com”);
}
Presenter

Reading data
• Callbacks
• Read Type
• Value
• Child
• Firebase Listener
• ValueEventListener
• ChildEventListener (added, removed, changed)
DroidconIT2016 – Alessandro Martellucci

Read value changes
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com”);
mFirebaseRef.child(“data”).addValueEventListener(new ValueEventListener() {
@Override public void onDataChange(DataSnapshot snapshot) {
Map<String, Object> value = snapshot.getValue(Map.class);
//or
MyBean myBean = snapshot.getValue(MyBean.class);
}
@Override public void onCancelled(FirebaseError firebaseError) {
Log.e(TAG, "The read failed: " + firebaseError.getMessage());
}
});
Value Event Listener
DroidconIT2016 – Alessandro Martellucci

Read new child
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com/data”);
mFirebaseRef.addChildEventListener(new ChildEventListener() {
@Override public void onChildAdded(DataSnapshot snapshot, String previousChildKey) {
MyBean myBean = snapshot.getValue(MyBean.class);
String foo = myBean.getFoo();
}
@Override public void onCancelled(FirebaseError firebaseError) {
Log.e(TAG, "The read failed: " + firebaseError.getMessage());
}
});
Child Event Listener
DroidconIT2016 – Alessandro Martellucci

Read child updates
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com/data”);
mFirebaseRef.addChildEventListener(new ChildEventListener() {
@Override public void onChildChanged(DataSnapshot snapshot, String previousChildKey) {
MyBean myBean = snapshot.getValue(MyBean.class);
Log.d(TAG, ”Prop foo has been updated to: " + myBean.getFoo());
}
@Override public void onCancelled(FirebaseError firebaseError) {
Log.e(TAG, "The read failed: " + firebaseError.getMessage());
}
});
Child Event Listener
DroidconIT2016 – Alessandro Martellucci

Read removed child
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com/data”);
mFirebaseRef.addChildEventListener(new ChildEventListener() {
@Override public void onChildRemoved(DataSnapshot snapshot) {
MyBean myBean = snapshot.getValue(MyBean.class);
System.out.println(”This entry has been removed: " + myBean.toString());
}
@Override public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
Child Event Listener
DroidconIT2016 – Alessandro Martellucci

Saving Data
• Non-concurrent
• Insert
• Update
• Concurrent
• IDs generation
• Transaction
DroidconIT2016 – Alessandro Martellucci

Write or replace data (1/2)
{
…,
status: {
connectedUsers: 10,
...
},
...
}
Online users
DroidconIT2016 – Alessandro Martellucci
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com”);
int connectedUsers = countConnectedUsers();
mFirebaseRef.child(“status/connectedUsers”).setValue(connectedUsers);
1) Naviga.ng by subnodes

Write or replace data (2/2)
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com/status”);
int connectedUsers = countConnectedUsers();
mFirebaseRef.child(“connectedUsers”).setValue(connectedUsers);
2) Naviga.ng direct to node
DroidconIT2016 – Alessandro Martellucci
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com/status”);
Map<String, String> statusMap = new HashMap<String, String>();
statusMap.put(“connectedUsers”, String.valueOf(countConnectedUsers());
mFirebaseRef.setValue(statusMap);
3) Using Map

Overwrite & delete
JSON node
DroidconIT2016 – Alessandro Martellucci
{ “status”:{
“connectedUsers”:1,
“startTime”:1456426772000,
“endTime”:1456426772000
}
}
{ “status”:{
“connectedUsers”:1
}
}
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com/status”);
Map<String, String> statusMap = new HashMap<String, String>();
statusMap.put(“connectedUsers”, String.valueOf(countConnectedUsers());
mFirebaseRef.setValue(statusMap);
Java Code

Update children
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com/status”);
Map<String, String> statusMap = new HashMap<String, String>();
statusMap.put(“connectedUsers”, String.valueOf(countConnectedUsers());
mFirebaseRef.updateChildren(statusMap);
1) Upda.ng nodes
DroidconIT2016 – Alessandro Martellucci
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com”);
Map<String, String> statusMap = new HashMap<String, String>();
statusMap.put(“status/connectedUsers”, String.valueOf(countConnectedUsers());
mFirebaseRef.updateChildren(statusMap);
2) Upda.ng subnodes

Concurrent-indipendent insert
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com”);
Firebase dataChildRef = mFirebaseRef.child(“data”);
Firebase newChildRef = dataChildRef.push();
Map<String, Object> colorMap = new HahsMap<String, Object>();
colorMap.put(“red”, “242”);
colorMap.put(“green”, “10”);
colorMap.put(“blue”, “22”);
newChildRef .setValue(colorMap);
Java Code
DroidconIT2016 – Alessandro Martellucci

Concurrent-dipendent insert
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com/data”);
newChildRef.runTransaction(new Transaction.Handler() {
@Override
public Transaction.Result doTransaction(MutableData currentData) {
if((currentData.getValue() == null) {
currentData.setValue(1);
} else {
currentData.setValue((Long) currentData.getValue() + 1);
}
return Transaction.success(currentData);
}
@Override
public void onComplete(FirebaseError error, boolean committed, DataSnapshot currentData) {
…
}
});
Java Code
DroidconIT2016 – Alessandro Martellucci

Working offline
• Works offline
• Seamless experience
• Auto synchronization
DroidconIT2016 – Alessandro Martellucci

User authentication
DroidconIT2016 – Alessandro Martellucci
• User identification
• Email & password login
• Easy integration
• Facebook, GitHub, Google and Twitter
• Session management
• Single session
• Custom token

FirebaseUI - Authentication
DroidconIT2016 – Alessandro Martellucci
1. Add SDK dependencies
2. Add Facebook/Twitter/Google keys to
strings.xml
3. Change our AndroidManifest.xml
4. Inherit from FirebaseLoginBaseActivity
5. Enable authentication providers
6. Call showFirebaseLoginDialog();

Facebook authentication
DroidconIT2016 – Alessandro Martellucci
Firebase mFirebaseRef = new Firebase(“https://droidconit2016-demo.firebaseio.com/data”);
mFirebaseRef .addAuthStateListener(new Firebase.AuthStateListener() {
@Override
public void onAuthStateChanged(AuthData authData) {
if (authData != null) {
// user is logged in
Map<String, String> map = new HashMap<String, String>();
map.put("provider", authData.getProvider());
if(authData.getProviderData().containsKey("displayName")) {
map.put("displayName", authData.getProviderData().get("displayName").toString());
}
ref.child("users").child(authData.getUid()).setValue(map);
} else {
// user is not logged in
}
}
});
Authen.ca.on

Rules management (1/2)
DroidconIT2016 – Alessandro Martellucci
{
"rules": {
".read": true,
".write": true
}
}
Basic rules
• JavaScript-like
• Node permissions
• Node validations

Rules management (2/2)
DroidconIT2016 – Alessandro Martellucci
{
“status”: {
“schedule”: {
“startTime”: 123456670292,
…
}
}
}
startTime node
{
"rules": {
"status": {
"schedule": {
"startTime": {
// readable
".read": true,
// data written must be a number
".validate": "newData.isNumber()”,
// write authorization
".write": "$user_id === auth.uid”
}}}}}
Rules for startTime node

FirebaseUI
DroidconIT2016 – Alessandro Martellucci
• Open source library
• iOS support
• Authentication
• built-in dialog
• List binding
• ListView
• RecyclerView

FirebaseUI – ListView
DroidconIT2016 – Alessandro Martellucci
@Override
protected void onCreate(Bundle savedInstanceState) {
…
ListView messagesView = (ListView) findViewById(R.id.messages_list);
mAdapter = new FirebaseListAdapter<MyBean>(this, MyBean.class,
R.layout.my_list_item, mFirebaseRef) {
@Override
protected void populateView(View view, MyBean myBean, int position) {
((TextView)view.findViewById(android.R.id.text1)).setText(myBean.getFoo());
}
};
messagesView.setAdapter(mAdapter);
}
Adapter

FirebaseUI – RecyclerView
DroidconIT2016 – Alessandro Martellucci
@Override
protected void onCreate(Bundle savedInstanceState) {
…
RecyclerView recycler = (RecyclerView) findViewById(R.id.messages_recycler);
recycler.setHasFixedSize(true);
recycler.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new FirebaseRecyclerAdapter<MyBean, MyBeanViewHolder>(MyBean.class, R.layout.my_line_list_item,
MyBeanViewHolder.class, mFirebaseRef) {
@Override
public void populateViewHolder(MyBeanViewHolder myBeanViewHolder, MyBean myBean, int position) {
myBeanViewHolder.nameText.setText(myBean.getFoo());
}
};
recycler.setAdapter(mAdapter);
}
Adapter

Pricing
DroidconIT2016 – Alessandro Martellucci
FREE
(0$ forever)
SPARK
(5$ month)
… INFERNO
(1499$ month)
DB connec.ons 100 100 … UNLIMITED
DB storage 1 GB 1 GB … 300 GB
DB transfer 10 GB 10 GB … 1.5 TB
Private Backups NO NO … YES
Authen.ca.on
UNLIMITED
USERS
UNLIMITED
USERS
…
UNLIMITED
USERS
Hos.ng Storage 1 GB 1 GB … 10 GB
Hos.ng Transfer 100 GB 100 GB … 1 TB
Custom Domain NO YES … YES

Resources
• BLOG: https://www.firebase.com/blog
• Twitter: @firebase
• Facebook: Firebase
• Google Plus: Firebase
• Official: http://www.firebase.com
• Github: https://github.com/firebase
• YouTube: Firecast: Firebase Screencast
DroidconIT2016 – Alessandro Martellucci

THANK YOU ALL
DroidconIT2016 – Alessandro Martellucci