I have a xamarin.forms android application on playstore. In which I have implemented foreground service to fire AlarmManager notifications (for android version >= Q). I can see some crashes logged on platstore for my app which I think is related to these foreground service and AlarmManager notifications. Here I am posting crash logs from the playstore that is all I have.
java.lang.IllegalStateException
crc640e87e93c5dbd1629.AlarmReceiver.n_onReceive
java.lang.RuntimeException:
at android.app.ActivityThread.handleReceiver (ActivityThread.java:4125)
at android.app.ActivityThread.access$1400 (ActivityThread.java:270)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2062)
at android.os.Handler.dispatchMessage (Handler.java:107)
at android.os.Looper.loop (Looper.java:237)
at android.app.ActivityThread.main (ActivityThread.java:7948)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1075)
Caused by: java.lang.IllegalStateException:
at android.app.ContextImpl.startServiceCommon (ContextImpl.java:1687)
at android.app.ContextImpl.startService (ContextImpl.java:1632)
at android.content.ContextWrapper.startService (ContextWrapper.java:683)
at android.content.ContextWrapper.startService (ContextWrapper.java:683)
at crc640e87e93c5dbd1629.AlarmReceiver.n_onReceive (Native Method)
at crc640e87e93c5dbd1629.AlarmReceiver.onReceive (AlarmReceiver.java:29)
at android.app.ActivityThread.handleReceiver (ActivityThread.java:4116)
here is another log
java.lang.ClassNotFoundException
crc643622be0927bcf195.NotificationService.n_onStartCommand
java.lang.RuntimeException:
at android.app.ActivityThread.handleServiceArgs (ActivityThread.java:3755)
at android.app.ActivityThread.-wrap23 (ActivityThread.java)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1744)
at android.os.Handler.dispatchMessage (Handler.java:102)
at android.os.Looper.loop (Looper.java:154)
at android.app.ActivityThread.main (ActivityThread.java:6780)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1500)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1390)
Caused by: java.lang.ClassNotFoundException:
at dalvik.system.BaseDexClassLoader.findClass (BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass (ClassLoader.java:380)
at java.lang.ClassLoader.loadClass (ClassLoader.java:312)
at crc643622be0927bcf195.NotificationService.n_onStartCommand (Native Method)
at crc643622be0927bcf195.NotificationService.onStartCommand (NotificationService.java:31)
at android.app.ActivityThread.handleServiceArgs (ActivityThread.java:3738)
Here is the NotificationService class :
[Service]
public class NotificationService : Service
{
private bool isStarted;
private int HIDDEN_NOTIFICATION_SERVICE_ID = 1;
private string HIDDEN_NOTIFICATION_CHANNEL_ID = "1";
private string HIDDEN_NOTIFICATION_NAME = "Hidden Notification Service";
[return: GeneratedEnum]
public override StartCommandResult OnStartCommand(Intent intent, [GeneratedEnum] StartCommandFlags flags, int startId)
{
if (!isStarted)
{
CreateHiddenNotificationChannel();
DispatchNotificationThatServiceIsRunning();
isStarted = true;
}
return StartCommandResult.NotSticky;
}
public override void OnDestroy()
{
// Remove the notification from the status bar.
var notificationManager = (NotificationManager)GetSystemService(NotificationService);
notificationManager.Cancel(HIDDEN_NOTIFICATION_SERVICE_ID);
isStarted = false;
base.OnDestroy();
}
void CreateHiddenNotificationChannel()
{
NotificationChannel hiddentNotificationChannel = new NotificationChannel(HIDDEN_NOTIFICATION_CHANNEL_ID, HIDDEN_NOTIFICATION_NAME, NotificationImportance.Low);
hiddentNotificationChannel.LockscreenVisibility = NotificationVisibility.Secret;
hiddentNotificationChannel.SetSound(null, null);
hiddentNotificationChannel.EnableVibration(false);
NotificationManager notificationManager = (NotificationManager)this.GetSystemService(Context.NotificationService);
notificationManager.CreateNotificationChannel(hiddentNotificationChannel);
}
//start a foreground notification to keep app alive
private void DispatchNotificationThatServiceIsRunning()
{
Intent intent = new Intent(this, typeof(BroadcastReceiver.CustomReceiver));
PendingIntent pendingIntent = PendingIntent.GetBroadcast(
this,
1,
intent,
PendingIntentFlags.UpdateCurrent
);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, HIDDEN_NOTIFICATION_CHANNEL_ID)
.SetDefaults((int)NotificationDefaults.All)
.SetSmallIcon(Resource.Drawable.icon)
.SetSound(null)
.SetContentIntent(pendingIntent)
.SetPriority(NotificationCompat.PriorityMin)
.SetAutoCancel(false)
.SetContentTitle(AppResources.MyApp)
.SetContentText(AppResources.ForegroundServiceNotificationMsg)
.SetStyle(new NotificationCompat.BigTextStyle().BigText(AppResources.ForegroundServiceNotificationMsg))
.SetOngoing(true);
NotificationManagerCompat notificationManager = NotificationManagerCompat.From(this);
StartForeground(HIDDEN_NOTIFICATION_SERVICE_ID, builder.Build());
}
public override IBinder OnBind(Intent intent)
{
return null;
}
}
Starting above service from MainActivity and from BroadcastReceiver class when user reboots the device
if (Android.OS.Build.VERSION.SdkInt >= BuildVersionCodes.Q)
Android.App.Application.Context.StartForegroundService(new Intent(Android.App.Application.Context, typeof(Services.NotificationService)));
Related
In my Xamarin Forms project I have:
[BroadcastReceiver(Permission = "RECEIVE_BOOT_COMPLETED",
Exported = true,
Enabled = true)]
[IntentFilter(new[] {Intent.ActionBootCompleted})]
public class GeofenceReceiver: BroadcastReceiver
I use it for GeofenceTransitionEnter and GeofenceTransitionExit events.
I also have ACCESS_FINE_LOCATION and ACCESS_BACKGROUND_LOCATION permissions.
But OnReceive method is not called on API 31. I have not this problem with lower APIs.
Android 12 targetSDKVersion 31 challenges (Broadcast Receiver, Pending Intent) Crash Issues - doesn't work for me
I have done a sample to test. And it worked well, the OnReceive method will call a few minutes after the device restarted.
The receiver:
[BroadcastReceiver(Permission = "RECEIVE_BOOT_COMPLETED",
Exported = true,
Enabled = true)]
[IntentFilter(new[] { Intent.ActionBootCompleted })]
public class GeofenceReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
//launch our activity
if (intent.Action == "android.intent.action.BOOT_COMPLETED")
{
Toast.MakeText(context,"Device Restart",ToastLength.Long).Show();
Intent intent1 = new Intent(context,typeof(ForegroundServiceDemo));
intent1.SetFlags(ActivityFlags.NewTask);
context.StartForegroundService(intent1);
}
}
}
The foreground service:
[Service]
public class ForegroundServiceDemo : Service
{
private string NOTIFICATION_CHANNEL_ID = "1000";
private int NOTIFICATION_ID = 1;
private string NOTIFICATION_CHANNEL_NAME = "notification";
private void startForegroundService()
{
var notifcationManager = GetSystemService(Context.NotificationService) as NotificationManager;
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
createNotificationChannel(notifcationManager);
}
var notification = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
notification.SetAutoCancel(false);
notification.SetOngoing(true);
notification.SetSmallIcon(Resource.Mipmap.icon);
notification.SetContentTitle("ForegroundService");
notification.SetContentText("Foreground Service is running");
StartForeground(NOTIFICATION_ID, notification.Build());
}
private void createNotificationChannel(NotificationManager notificationMnaManager)
{
var channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME,
NotificationImportance.Low);
notificationMnaManager.CreateNotificationChannel(channel);
}
public override IBinder OnBind(Intent intent)
{
return null;
}
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
startForegroundService();
return StartCommandResult.NotSticky;
}
}
The AndroidManifest.xml:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.START_FOREGROUND_SERVICES_FROM_BACKGROUND" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
I added the RECEIVE_BOOT_COMPLETED into the AndroidManifes.xml, because if I just added it in the [BroadcastReceiver], the receiver will not work. So you can also try to add it in the AndroidManifes.xml.
In addition, you can create a new project to test my code. It worked on Android 12.0 emulator when I tested it. Finally, if it still not work, could you please show the code in the OnReceive method? Maybe the OnReceive method was called, but the code in it can't run background such as start an activity.
I just added something like this into GepfencePendingIntent:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE)
} else {
PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
}
I found it here: https://www.flybuy.com/android-12-pendingintent-mutability-and-geofences
I completed receiving test notification from FCM console. Now I am trying to open a page when tapping the notification. Any ideas about how to achieve this? I have searched the internet but can't find a working solution. I am also able to send the notification through the postman.
I handle the notification tapping in following way. The page loading is handled in App.xaml.cs.
On OnCreate():
//Background or killed mode
if (Intent.Extras != null)
{
foreach (var key in Intent.Extras.KeySet())
{
var value = Intent.Extras.GetString(key);
if (key == "webContentList")
{
if (value?.Length > 0)
{
isNotification = true;
LoadApplication(new App(domainname, value));
}
}
}
}
//Foreground mode
if (FirebaseNotificationService.webContentList.ToString() != "")
{
isNotification = true;
LoadApplication(new App(domainname, FirebaseNotificationService.webContentList.ToString()));
FirebaseNotificationService.webContentList = "";
}
//Normal loading
if (!isNotification)
{
LoadApplication(new App(domainname, string.Empty));
}
On FirebaseNotificationService:
[Service]
[IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
public class FirebaseNotificationService : FirebaseMessagingService
{
public static string webContentList = "";
public override void OnMessageReceived(RemoteMessage message)
{
base.OnMessageReceived(message);
webContentList = message.Data["webContentList"];
try
{
SendNotificatios(message.GetNotification().Body, message.GetNotification().Title);
}
catch (Exception ex)
{
Console.WriteLine("Error:>>" + ex);
}
}
public void SendNotificatios(string body, string Header)
{
if (Build.VERSION.SdkInt < BuildVersionCodes.O)
{
var intent = new Intent(this, typeof(MainActivity));
intent.AddFlags(ActivityFlags.ClearTop);
var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);
var notificationBuilder = new Android.App.Notification.Builder(this, Utils.CHANNEL_ID)
.SetContentTitle(Header)
.SetSmallIcon(Resource.Drawable.icon)
.SetContentText(body)
.SetAutoCancel(true)
.SetContentIntent(pendingIntent);
var notificationManager = NotificationManager.FromContext(this);
notificationManager.Notify(0, notificationBuilder.Build());
}
else
{
var intent = new Intent(this, typeof(MainActivity));
intent.AddFlags(ActivityFlags.ClearTop);
var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);
var notificationBuilder = new Android.App.Notification.Builder(this, Utils.CHANNEL_ID)
.SetContentTitle(Header)
.SetSmallIcon(Resource.Drawable.icon)
.SetContentText(body)
.SetAutoCancel(true)
.SetContentIntent(pendingIntent)
.SetChannelId(Utils.CHANNEL_ID);
if (Build.VERSION.SdkInt < BuildVersionCodes.O)
{
return;
}
var channel = new NotificationChannel(Utils.CHANNEL_ID, "FCM Notifications", NotificationImportance.High)
{
Description = "Firebase Cloud Messages appear in this channel"
};
var notificationManager = (NotificationManager)GetSystemService(NotificationService);
notificationManager.CreateNotificationChannel(channel);
notificationManager.Notify(0, notificationBuilder.Build());
}
}
I don't know what's your actual Firebase implementation, but this might help you.
There is a nice package for Firebase in Xamarin Forms that we use in our production App made by CrossGeeks team. Its working great and has all handlers for your needs. This works with iOS and Android and you don't need to write platform specific code, only configuration and some code in AppDelegate.cs and MainActivity.cs
https://github.com/CrossGeeks/FirebasePushNotificationPlugin/blob/master/docs/FirebaseNotifications.md#notification-events
I wrote a simple PushNotificationService that processes automatic refresh and/or pushes new pages considering push notif data.
When app is closed and user clicks on the notification, I store the push notif data using Akavache.
CrossFirebasePushNotification.Current.OnNotificationOpened += async (s, p) =>
{
if (App.AppBeenResumed)
{
await BlobCache.UserAccount.InsertObject("pushNotifData", p.Data);
}
else
{
await ProcessReceivedPushNotification(p.Data);
}
};
And on the landing page of the app, I check if there is an existing push notif data in the OnAppearing method of the page.
protected override void OnAppearing()
{
base.OnAppearing();
App.AppBeenResumed = false;
HandlePushNotificationIfExists();
}
private async void HandlePushNotificationIfExists()
{
IDictionary<string, object> pushNotifData;
try
{
pushNotifData = await BlobCache.UserAccount.GetObject<IDictionary<string, object>>("pushNotifData");
}
catch (KeyNotFoundException)
{
pushNotifData = null;
}
if (pushNotifData == null) return;
await BlobCache.UserAccount.InvalidateAllObjects<IDictionary<string, object>>();
await PushNotificationService.ProcessReceivedPushNotification(pushNotifData);
}
In the ProcessReceivedPushNotification you can do whatever you want ... push directly the page or whatever... call another service that will do the job of pushing a new page and some business process.
Note that App.AppBeenResumed is a static bool to determine if App has been started or resumed to handle correctly the process of treatment of the push notif (process it instant or store it in blobcache to treat it later when landing page is Appearing).
In MainActivity.cs :
protected override void OnCreate(Bundle bundle)
{
...
LoadApplication(new App(true));
}
In the App.cs :
public App(bool beenResumedOrStarted)
{
...
AppBeenResumed = beenResumedOrStarted;
...
}
protected override void OnResume()
{
AppBeenResumed = false;
}
protected override void OnSleep()
{
//iOS states are not the same so always false when device is iOS
AppBeenResumed = Device.RuntimePlatform != Device.iOS;
}
When I push notification from fore base I faced this error
E/AudioFlinger: not enough memory for AudioTrack size=131296
02-26 21:00:38.035 1328-1328/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
02-26 21:00:38.035 2145-2256/? E/AudioRecord: AudioFlinger could not create record track, status: -12
02-26 21:00:38.039 2145-2256/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
02-26 21:00:38.039 2145-2256/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
02-26 21:00:38.040 2145-2256/? E/ActivityThread: Failed to find provider info for
com.google.android.apps.gsa.testing.ui.audio.recorded
This is the on receive method
#Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
sendNotification(remoteMessage.getNotification().getBody());
}
private void sendNotification(String messageBody) {
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("FCM Message")
.setContentText(messageBody)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}
I started using xamarin a few months ago, and, until now, I didn't have the need of doing something like this.
I'm developing an app that, once a day, should run a WCF web service and verify if an information is true. If it is true, it should show a notification on the device.
My problem is that I don't know how to perform it, i've read about backgrounding and schedule tasks, but I didn't understand well how can I perform this. How can I do it using Xamarin.Forms?
Thank you!
For Android, a solution needs 4 components:
AlarmManager to set daily check schedule
BroadCastReceiver to receive the daily trigger and call the IntentService
IntentService to execute awaitable calls
OnBootReceiver to ensure alarms are set again after a device reboot
For iOS, you will most likely need remote push notifications.
Some sample code below for the Android components:
AlarmManager - Setting the Alarm
[assembly: Dependency(typeof(AlarmHelper))] // above the namespace
...
class AlarmHelper: IAlarm
{
var now = Calendar.Instance;
var alarmTime = Calendar.Instance;
alarmTime.Set(CalendarField.HourOfDay, settings.AlarmHour); // Set Alarm start Hour
alarmTime.Set(CalendarField.Minute, settings.AlarmMinutes); // Set Alarm Start Minutes
if (alarmTime.Before(now))
{
alarmTime.Add(CalendarField.Hour, 24);
}
var intent = new Intent(Android.App.Application.Context, typeof(ScheduledAlarmHandler));
var pendingIntent = PendingIntent.GetBroadcast(Android.App.Application.Context, 0, intent, PendingIntentFlags.CancelCurrent);
var alarmManager = Android.App.Application.Context.GetSystemService(Context.AlarmService) as AlarmManager;
alarmManager.SetRepeating(AlarmType.RtcWakeup, alarmTime.TimeInMillis, AlarmManager.IntervalDay, pendingIntent);
}
BroadCastReceiver - Receiving the Alarm
[BroadcastReceiver]
class ScheduledAlarmHandler : WakefulBroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
Console.WriteLine("ScheduledAlarmHandler", "Starting service #" + SystemClock.ElapsedRealtime());
Intent service = new Intent(context, typeof(WakefulAPIService));
StartWakefulService(context, service);
}
}
IntentService - Executing awaitable calls
[Service]
[IntentFilter(new String[] { "com.test.testApp.WakefulAPIService" })]
class WakefulAPIService : IntentService
{
protected override void OnHandleIntent(Intent intent)
{
// Your API Call code here
Console.WriteLine("WakefulAPIService", "Completed service # " + SystemClock.ElapsedRealtime());
Android.Support.V4.Content.WakefulBroadcastReceiver.CompleteWakefulIntent(intent);
}
}
OnBootReceiver - Ensuring alarms are set again after a device reboot
[BroadcastReceiver(Enabled = true)]
[IntentFilter(new[] { "android.intent.action.BOOT_COMPLETED", "android.intent.action.QUICKBOOT_POWERON" })]
class OnBootReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
Console.WriteLine("On Boot Reveiver", "Alarm Set Again after Reboot");
var alarmHelper = new AlarmHelper();
alarmHelper.SetAlarm();
}
}
The required permissions for this to work are 'RECEIVE_BOOT_COMPLETED' and 'WAKE_LOCK'
In this case for Android you can use you can use JobScheduler, see this class
[Service(Name = "com.xamarin.samples.downloadscheduler.DownloadJob",
Permission = "android.permission.BIND_JOB_SERVICE")]
public class DownloadJob : JobService
{
public override bool OnStartJob(JobParameters jobParams)
{
Task.Run(() =>
{
//Your periodic task here
});
return true;
}
public override bool OnStopJob(JobParameters jobParams)
{
//true so we re-schedule the task
return true;
}
}
Then you can create a Factory to call this service.
public static class ReadLocationSchedulerFactory
{
public static JobInfo.Builder CreateJobBuilderUsingJobId<T>(this Context context, int jobId) where T : JobService
{
var javaClass = Java.Lang.Class.FromType(typeof(T));
var componentName = new ComponentName(context, javaClass);
return new JobInfo.Builder(jobId, componentName);
}
}
Then in your Main Activity you have to call the Factory.
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
global::Xamarin.Forms.Forms.Init(this, bundle);
LoadApplication(new App172S.App());
#region Scheduler
var jobBuilder = this.CreateJobBuilderUsingJobId<ReadLocationScheduler>(152);
//This means each 20 mins
jobBuilder.SetPeriodic(20 * 60 * 1000);
//Persists over phone restarts
jobBuilder.SetPersisted(true);
//If Fails re-try each 2 mins
jobBuilder.SetBackoffCriteria(120 * 1000, BackoffPolicy.Linear);
var jobInfo = jobBuilder.Build();
var jobScheduler = (JobScheduler)GetSystemService(JobSchedulerService);
jobScheduler.Cancel(152);
var scheduleResult = jobScheduler.Schedule(jobInfo);
if (JobScheduler.ResultSuccess == scheduleResult)
{
//If OK maybe show a msg
}
else
{
//If Failed do something
}
#endregion
}
i want to generate a notification bar showing the progress via builder method but i dont know where i am going wrong.if anyone who can tell me where i am wrong and help me i will be thankful.....
public class DownloadReceiver extends ResultReceiver{
private final static String TAG = "DownloadReceiver";
public Context context;
public DownloadReceiver(Handler handler,Context context) {
super(handler);
this.context = context;
Log.d(TAG,handler.getLooper().getThread().getName());
}
#Override
protected void onReceiveResult(int resultCode, Bundle resultData) {
super.onReceiveResult(resultCode, resultData);
Log.d(TAG,"in download receiver");
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Service.NOTIFICATION_SERVICE);
Intent notifyIntent = new Intent(android.content.Intent.ACTION_VIEW,Uri.parse("http://www.android.com"));
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, notifyIntent, 0);
if(resultCode == DownloadService.COMPLETED){
Log.d(TAG,resultCode + "");
Builder notificationBuilder = new NotificationCompat.Builder(context)
.setProgress(100, 20, false)
.addAction(R.drawable.ic_action_search, "title", pendingIntent)
.setWhen(System.currentTimeMillis());
// notification.flags = Notification.FLAG_ONGOING_EVENT;
// notification.setLatestEventInfo(context, "contentTitle", "contentText", pendingIntent);
notificationManager.notify(50, notificationBuilder.build());
}else if(resultCode == DownloadService.ALLCOMPLETED){
}
}
}
I just had to deal with this just now, the solution for me was that you have to add a notification image
.setSmallIcon(R.drawable.launcher)
otherwise it won't show anything. The old notification method didn't require you to set this yourself, as it would default to the app's icon.