I have created a dependencie to show the notifications
In My DeviceDetails_Droid.cs I've set set alarm for 30 seconds
The functionality for local notification works perfectly when app is active but when I killed the app (close app) the alarm receiver not getting called.
public void ShowNotification(string message, string title)
{
Intent alarmIntent = new Intent(Forms.Context, typeof(AlarmReceiver));
alarmIntent.PutExtra ("message", message);
alarmIntent.PutExtra ("title", title);
PendingIntent pendingIntent = PendingIntent.GetBroadcast(Forms.Context, 0, alarmIntent, PendingIntentFlags.UpdateCurrent);
AlarmManager alarmManager = (AlarmManager) Forms.Context.GetSystemService(Context.AlarmService);
//TODO: For demo set after 5 seconds.
alarmManager.Set(AlarmType.RtcWakeup, DateTime.Now.Millisecond + 30000, pendingIntent);
}
[BroadcastReceiver]
public class AlarmReceiver : BroadcastReceiver
{
public override void OnReceive (Context context, Intent intent)
{
var message = intent.GetStringExtra ("message");
var title = intent.GetStringExtra ("title");
var notIntent = new Intent (context, typeof(MainActivity));
var contentIntent = PendingIntent.GetActivity (context, 0, notIntent, PendingIntentFlags.CancelCurrent);
var manager = NotificationManagerCompat.From (context);
var style = new NotificationCompat.BigTextStyle();
style.BigText(message);
//Generate a notification with just short text and small icon
var builder = new NotificationCompat.Builder (context)
.SetContentIntent (contentIntent)
.SetSmallIcon (Resource.Drawable.Icon)
.SetContentTitle (title)
.SetContentText (message)
.SetStyle (style)
.SetWhen (Java.Lang.JavaSystem.CurrentTimeMillis ())
.SetAutoCancel (true);
var notification = builder.Build();
manager.Notify(0, notification);
}
}
<receiver
android:name=".AlarmReceiver"
android:enabled="true"
android:exported="true"
android:process=":remote"
android:label="AlarmReceiver">
1) If someone kills your app, alarms registered to your app are cancelled.
2) You can start your service in the background on Boot
of the device in order to register your alarms, or run any other code you need to setup your notifications...
[BroadcastReceiver]
[IntentFilter(new string[]{"android.intent.action.BOOT_COMPLETED"}, Priority = (int)IntentFilterPriority.LowPriority)]
public class AlarmReceiver : BroadcastReceiver
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
In the case of Xamarin's Stock Price example, if you set "RECEIVE_BOOT_COMPLETED" you are "auto" restart your service and the your will start receiving notifications upon reboot of their phone without first launching your app:
[BroadcastReceiver]
[IntentFilter(new string[]{StockService.StocksUpdatedAction,Boo "android.intent.action.BOOT_COMPLETED"}, Priority = (int)IntentFilterPriority.LowPriority)]
public class StockNotificationReceiver : BroadcastReceiver
3) You can use a Service
vs. a SeviceIntent
and override the StartCommandResult
to return Sticky
With a Sticky-based Service, it is restarted if it gets terminated.
Constant to return from onStartCommand(Intent, int, int): if this service's process is killed while it is started (after returning from onStartCommand(Intent, int, int)), then leave it in the started state but don't retain this delivered intent. Later the system will try to re-create the service. Because it is in the started state, it will guarantee to call onStartCommand(Intent, int, int) after creating the new service instance; if there are not any pending start commands to be delivered to the service, it will be called with a null intent object, so you must take care to check for this.
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
return StartCommandResult.Sticky;
}
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