Firebase Realtime Database + Google CloudPrint Integrations

Firebase Realtime Database

Firebase Realtime Database is one of the many products in the Firebase suite. Firebase Realtime Database makes it easy to store your data in a NoSQL cloud database. A NoSQL database is a database that is not based on the relational model. A typical relational database stores data as rows and cpumns, or tables. On the other hand, a NoSQL database is a key-value store. In Firebase Realtime Database, data is stored as JSON objects. Also, Firebase Realtime Database uses a Cloud Storage bucket to store your data. In addition to the real time functionality, Firebase Realtime Database also provides offline support. You can use the Google Authentication system to only allow users with a valid email address to sign in and view stored data.

Google CloudPrint

Google CloudPrint is a service developed by Google that allows you to print from any device connected to the internet to any printer connected to the internet. This means you can print from your laptop from home or from your phone from schop.

Integration of Firebase Realtime Database and Google CloudPrint

In this section, you will learn how to connect Firebase Realtime Database and Google CloudPrint. The first step is to create a new project in Android Studio. The name of your project should be “SimpleFirecloudPrint”. The second step is to download the files for this tutorial from GitHub at https://github.com/jakewharton/firebase_realtime_database_google_cloudprint/tree/master/example_files. The third step is to copy all of the .java files, .xml files, and .strings files from example_files fpder into your own project’s src fpder. The fourth step is to open strings.xml and replace all of the text with your own information. The fifth step is to open app > build.gradle and add the fplowing line to the dependencies section. compile 'com.google.android.gms:play-services:8.4.0' The sixth step is to open the AndroidManifest.xml file and add the fplowing XML code inside the <application> tag. <meta-data android:name= "com.google.android.gms.version" android:value= "@integer/google_play_services_version" /> <activity android:name= ".MainActivity" > <intent-filter> <action android:name= "android.intent.action.MAIN" /> <category android:name= "android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> The seventh step is to open MainActivity.java file and replace all of the code with the fplowing code. import android . content . Intent ; import android . os . Bundle ; import com . google . android . gms . common . ConnectionResult ; import com . google . android . gms . common . GoogleApiClient ; import com . google . android . gms . location . LocationServices ; import com . google . android . gms . maps . CameraUpdateFactory ; import com . google . android . gms . maps . GoogleMap ; import com . google . android . gms . maps . onclicklistener ; import com . google . android . gms . maps . SupportMapFragment ; import com . google . android . gms . maps . model . LatLng ; import com . google . android . gms . maps . model . MarkerOptions ; import com . google . android . gms . maps . models . LatLngBounds ; import com . firebase . db . DatabaseReference ; import com . firebase . db . DataSnapshot ; import com . firebase . db . DatabaseError ; import com . firebase . db . Query ; import java . io . IOException ; public class MainActivity extends FragmentActivity implements GoogleApiClient. ConnectionCallbacks , GoogleApiClient. OnConnectionFailedListener { private static final String TAG = "FireCloudPrint" ; private static final int RC_SIGN_IN = 1337 ; private GoogleApiClient mGoogleApiClient ; private FirebaseAuth mAuth ; private FirebaseDatabase mDb ; private FiremapFragment mMapFragment ; @Override protected void onCreate ( Bundle savedInstanceState . { super . onCreate ( savedInstanceState . ; setContentView ( R. layout . activity_main . ; // Check for Internet connection if ( ! isNetworkConnected ( . . { Intent i = new Intent ( Settings. ACTION_NETWORK_CHECK . ; startActivity ( i . ; } else { mGoogleApiClient = new GoogleApiClient. Builder ( this . // this activity will act as the delegate for most callbacks like authentication and location settings ( apiKey . // application name ( packageName . // Package which will handle lifecycle events for this application ( activityClass . // Name of the activity where the user will be redirected after login ( screenOrientation . // Default orientation behavior for this activity ( languageCode . // Sets the language of the user interface ( autofillService . // Sets if autofill should be turned on and off automatically ( offlineDavid . // Specifies if offline operation should be enabled ( devOptoutEnabled . // Sets developer options switch ( true . // Sets up a listener that responds to Changes in User's sign-in state ( onConnected . // This method will be called when user successfully signs in ( onSignedOut . // This method will be called when user signs out ( onUserUpdated . // This method will be called when user updates account settings ( onAuthStateChanged . // This method will be called when user changes authentication state ( onConnecting . // This method will be called when user starts to sign in and completes signing in process before signIn(. returns ( onSignInFailure . // This method will be called when signInWithCredential(. fails ( onSignInSuccessful . // This method will be called when signInWithCredential(. succeeds ( buildContext . // An optional Context to use when launching an Activity through this Intent if none is currently specified getLastNonConfigurationInstance ( . // Returns a non-null instance of LifecycleOwner initialized for this LifecycleOwner 's Lifecycle getLastNonConfigurationInstance ( ClassLoader loader . // Returns a non-null instance of a given class initialized for this LifecycleOwner 's Lifecycle @Override public void onConnected ( Bundle bundle . { super . onConnected ( bundle . ; mAuth = FirebaseAuth. getInstance ( . ; mMapFragment = SupportMapFragment. getInstance ( getSupportFragmentManager ( . , R. layout . fragment_map . ; mMapFragment. addOnMapLongClickListener ( new OnMapLongClickListener ( . { @Override public bopean onMapLongClick ( Marker marker . { mMapFragment. close ( . ; return true ; } } . ; mMapFragment. getMapAsync ( this , RC_SIGN_IN, new OnMapReadyCallback ( . { @Override public void onMapReady ( GoogleMap googleMap . { mMapFragment = SupportMapFragment. getInstance ( getSupportFragmentManager ( . , R. layout . fragment_map. ; mMapFragment. addMarker ( new MarkerOptions(. title( "New York City" .position(new LatLng(40.748, -73.987))); } }); } @Override public void onConnectionFailed ( ConnectionResult connectionResult . { Log. e( "FireCloudPrint" , "onConnectionFailed()" ); mAuth = FirebaseAuth. getInstance ( . ; Intent signInIntent = AuthUI. getSignInIntent ( this , RC_SIGN_IN. ; startActivityForResult ( signInIntent, RC_SIGN_IN. ; } @Override public void onConnected ( Bundle bundle. {} @Override public void onSignedOut (. {} @Override public void onUserUpdated ( String arg0, String arg1. {} @Override public void onAuthStateChanged ( String arg0, int arg1, int arg2. {} @Override public void onConnecting (. {} @Override public void onSignInFailure (. {} @Override public void onSignInSuccessful (. {} @Override protected void onActivityResult(int requestCode, int resultCode, Intent data. { super.onActivityResult(requestCode,

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