Notifications and Services. Landon Cox March 28, 2017
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1 Notifications and Services Landon Cox March 28, 2017
2 Networking so far Volley (retrieve quiz stored at URL) User starts app Check with server for new quiz Say you re building a messaging app How else might you use the network? Are the workflows different than those we ve seen?
3 How do we keep device data fresh?
4 Solution 1: polling Basic idea App periodically sends message to server Asks, is there anything new for me? Very simple to implement Create a timer When timer fires, exchange messages with server What s the problem?
5 Impact of polling on battery Network power LTE: mw WiFi: mw Assume radio stays in high-power state for 10 sec. Energy per LTE poll: 1500 mw x 10 seconds = 15 Joules 5 min frequency: 480 J/day 30 sec. frequency: 4800 J/day Total Pixel battery: ~40k Joules You probably have more than one app that needs to sync If you have a lot of apps, your radios will always be in a high-power state Choosing the right period right is difficult Check too often and drain the battery with useless messages Check too infrequently and user experience will suffer
6 Every outgoing query will put the radio in a highpower state.
7 Solution 2: push notifications Share persistent network connection across apps Device and server maintain (TCP) connection Radio can enter low-power state when no updates Server pushes updates to device Device can push updates to server Updates should be small (< 4KB) On-device service routes updates to apps Example: Firebase Cloud Messaging (FCM)
8 Share one persistent connection. High-power only when data is ready.
9 Firebase cloud messaging (FCM) Formerly Google Cloud Messaging (GCM) On your device Google Play Services (global, maintains connection to cloud) FirebaseInstanceIDService (per app, receives instance ID) FirebaseMessageService (per app, receives notifications) In the cloud Firebase (routes messages to app server, devices) App server (stores data, manages messaging)
10 Firebase cloud messaging (FCM) Formerly Google Cloud Messaging (GCM) On your device Google Play Services (global, maintains connection to cloud) FirebaseInstanceIDService (per app, receives instance ID) FirebaseMessageService (per app, receives data) In the cloud Firebase (routes messages to app server, devices) App server (stores data, manages messaging) Next time
11 Services Service Performs tasks on main thread: onstartcommand Defined as an app component Because it is a component, it is externally visible Who schedules most work on threads? Code already running inside our app
12 Services Service Performs tasks on main thread: onstartcommand Defined as an app component Because it is a component, it is externally visible Why might external visibility be useful? Allows processes to communicate with each other
13 Services Service Performs tasks on main thread: onstartcommand Defined as an app component Because it is a component, it is externally visible Why are services essential for FCM? Gives Google Play Services a place to send messages Forward new data from Firebase to app s Service
14 Services Service Performs tasks on main thread: onstartcommand Defined as an app component Because it is a component, it is externally visible Need to add Service to Android Manifest AndroidManifest.xml: <application <service android:name=.myservice /> />
15 Services Example Service Create a subclass of Service Use a worker thread to process IPC requests Handle requests serially public class MyService extends Service { protected int onstartcommand(intent intent) { // process IPC request What thread does this run on?
16 Services Example Service Create a subclass of Service Use a worker thread to process IPC requests Handle requests serially public class MyService extends Service { protected int onstartcommand(intent intent) { // process IPC request What is an Intent?
17 Quick Intents review
18 Displaying a web URL How does Android know which components could receive this Intent? Intent browserintent = new Intent(Intent.ACTION_VIEW, Uri.parse(" ")); startactivity(browserintent);
19 Intent filters Restricts which actions the Activity will accept (Intent Action must match) <activity android:name=".mainactivity"> <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity>
20 Intent filters <activity android:name=".mainactivity"> <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> Describes categories of Intent Activity accepts (Intent categories must match all)
21 Implementing MyService We can do this! Tools to use Handler Looper HandlerThread Useful to peak under the FCM hood
22 Implementing MyService public class MyService extends Service { private Looper mlooper; private ServiceHandler mhandler; protected void oncreate() { // on which thread does this code run? What needs to happen? protected int onstartcommand(intent intent) { // on which thread does this code run? private class ServiceHandler extends Handler { public ServiceHandler(Looper l) { super (l); public void handlemessage(message m) {
23 Implementing MyService public class MyService extends Service { private Looper mlooper; private ServiceHandler mhandler; protected void oncreate() { HandlerThread thread = new HandlerThread( ); thread.start(); // Get the Looper and use it for our Handler mservicelooper = thread.getlooper(); mservicehandler = new ServiceHandler(mServiceLooper); // on which thread does this code run? private class ServiceHandler extends Handler { public ServiceHandler(Looper l) { super (l); public void handlemessage(message m) {
24 Implementing MyService public class MyService extends Service { private Looper mlooper; private ServiceHandler mhandler; protected void oncreate() { // on which thread does this code run? protected int onstartcommand(intent intent) { // on which thread does this code run? private class ServiceHandler extends Handler { public ServiceHandler(Looper l) { super (l); public void handlemessage(message m) { What needs to happen?
25 Implementing MyService public class MyService extends Service { private Looper mlooper; private ServiceHandler mhandler; protected int onstartcommand(intent intent) { Toast.makeText( ).show(); // For each start request, forward the Intent Message msg = mservicehandler.obtainmessage(); msg.arg1 = intent; mservicehandler.sendmessage(msg); return 0; // on which thread does this code run?
26 Implementing MyService public class MyService extends Service { private Looper mlooper; private ServiceHandler mhandler; protected void oncreate() { // on which thread does this code run? Lucky for you, you can just subclass Firebase Services! protected int onstartcommand(intent intent) { // on which thread does this code run? private class ServiceHandler extends Handler { public ServiceHandler(Looper l) { super (l); public void handlemessage(message m) {
27 Firebase services FirebaseInstanceIDService Why does each app instance need a unique ID? Who manages mapping from users to instance IDs? FirebaseMessageService What should happen if your app is in the foreground? What should happen if your app is in the background? Note: you will likely need to update via SDK manager git clone
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