I have a service running, and would like to send a notification. Too bad, the notification object requires a Context
, like an Activity
, and not a Service
.
Do you know any way to by pass that ? I tried to create an Activity
for each notification but it seems ugly, and I can't find a way to launch an Activity
without any View
.
To create notifications you use the NotificationManager class which can be received from the Context , e.g. an activity or a service, via the getSystemService() method. NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); The Notification.
For sending Notification to any android Device you can use two technology: 1) Push. 2) Pull. For Push Technology you can use GCM(Google cloud messaging). For Pull Technology you can make you application continuously keep on connecting to server and trying to fetch data if it is available from there.
This example demonstrate about How to start a service from notification in Android. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.
Both Activity
and Service
actually extend
Context
so you can simply use this
as your Context
within your Service
.
NotificationManager notificationManager = (NotificationManager) getSystemService(Service.NOTIFICATION_SERVICE); Notification notification = new Notification(/* your notification */); PendingIntent pendingIntent = /* your intent */; notification.setLatestEventInfo(this, /* your content */, pendingIntent); notificationManager.notify(/* id */, notification);
This type of Notification is deprecated as seen from documents:
@java.lang.Deprecated public Notification(int icon, java.lang.CharSequence tickerText, long when) { /* compiled code */ } public Notification(android.os.Parcel parcel) { /* compiled code */ } @java.lang.Deprecated public void setLatestEventInfo(android.content.Context context, java.lang.CharSequence contentTitle, java.lang.CharSequence contentText, android.app.PendingIntent contentIntent) { /* compiled code */ }
Better way
You can send a notification like this:
// prepare intent which is triggered if the // notification is selected Intent intent = new Intent(this, NotificationReceiver.class); PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent, 0); // build notification // the addAction re-use the same intent to keep the example short Notification n = new Notification.Builder(this) .setContentTitle("New mail from " + "[email protected]") .setContentText("Subject") .setSmallIcon(R.drawable.icon) .setContentIntent(pIntent) .setAutoCancel(true) .addAction(R.drawable.icon, "Call", pIntent) .addAction(R.drawable.icon, "More", pIntent) .addAction(R.drawable.icon, "And more", pIntent).build(); NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); notificationManager.notify(0, n);
Best way
Code above needs minimum API level 11 (Android 3.0).
If your minimum API level is lower than 11, you should you use support library's NotificationCompat class like this.
So if your minimum target API level is 4+ (Android 1.6+) use this:
import android.support.v4.app.NotificationCompat; ------------- NotificationCompat.Builder builder = new NotificationCompat.Builder(this) .setSmallIcon(R.drawable.mylogo) .setContentTitle("My Notification Title") .setContentText("Something interesting happened"); int NOTIFICATION_ID = 12345; Intent targetIntent = new Intent(this, MyFavoriteActivity.class); PendingIntent contentIntent = PendingIntent.getActivity(this, 0, targetIntent, PendingIntent.FLAG_UPDATE_CURRENT); builder.setContentIntent(contentIntent); NotificationManager nManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); nManager.notify(NOTIFICATION_ID, builder.build());
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