private void StartMyForegroundService()
{
try
{
// Code not directly related to publishing the notification has been omitted for clarity.
// Normally, this method would hold the code to be run when the service is started.
var notifChannel = createNotificationChannel();
var notification = new NotificationCompat.Builder(this)
.SetContentTitle("selfCAC")
.SetContentText("selfCAC Filtering Service is Running in the back.")
.SetSmallIcon(Resource.Drawable.ic_notfiy_icon)
.SetContentIntent(BuildIntentToShowMainActivity())
.SetOngoing(true)
.SetChannelId(notifChannel.Id)
.SetPriority((int)NotificationPriority.Min) // Hide in oreo+
.Build();
// Enlist this instance of the service as a foreground service
StartForeground(SERVICE_RUNNING_NOTIFICATION_ID, notification);
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex.ToString());
}
}
// ==================================================================================================
// ==================================================================================================
public static void StartForegroundServiceCompat <T>(Context context, string ACTION, Bundle args = null) where T : Service
{
try
{
var intent = new Intent(context, typeof(T));
intent.SetAction(ACTION);
if (args != null)
{
intent.PutExtras(args);
}
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.O)
{
context.StartForegroundService(intent);
}
else
{
context.StartService(intent);
}
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex.ToString());
}
}
public static void StartScanning(Context ctx)
{
try
{
// Requirements here: https://developer.android.com/guide/topics/connectivity/wifi-scan
if (myWifiManager.IsWifiEnabled)
{
// register the Broadcast receiver to get the list of Wifi Networks
ctx.RegisterReceiver(myWifiReceiver, new IntentFilter(WifiManager.ScanResultsAvailableAction));
if (!myWifiManager?.StartScan() ?? false)
{
ctx.UnregisterReceiver(myWifiReceiver);
AndroidBridge.WifiScanningCallback?.Invoke(null, null, new Exception("Starting scan failed quietly"));
}
}
else
{
AndroidBridge.WifiScanningCallback?.Invoke(null, null, new Exception("Wifi is not on"));
}
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex.ToString());
AndroidBridge.WifiScanningCallback?.Invoke(null, null, ex);
}
}
public override bool OnStopJob(JobParameters @params)
{
// Called when a requierment not met any more (ex. idle became not-idle...)
bool shouldJobContinue = false; // Once requirement met again
bool invokeErrors = false;
int jobID = @params.JobId;
try
{
JobCallbacks callbacks = allJobs[jobID];
callbacks.onJobRequirementAbort?.Invoke();
shouldJobContinue = callbacks.shouldRetryAfterAbort?.Invoke() ?? shouldJobContinue;
}
catch (Exception ex)
{
invokeErrors = true;
AndroidLevelLogger.e(TAG, ex);
}
if (invokeErrors || !shouldJobContinue)
{
shouldJobContinue = false;
if (allJobs.ContainsKey(jobID))
{
allJobs.Remove(jobID);
}
}
return(shouldJobContinue);
}
public override void OnCreate()
{
// Should be called once in lifetime of this service
try
{
managedStart();
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex);
}
}
public static void cancelAllJobs(Context ctx)
{
try
{
var manager = (JobSchedulerType)ctx.GetSystemService(Context.JobSchedulerService);
manager.CancelAll();
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex);
}
}
public static void InitWifiScan(Context ctx)
{
try
{
myWifiManager = (WifiManager)ctx.GetSystemService(Context.WifiService);
myWifiReceiver = new WifiReceiver();
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex);
}
}
public override void OnDestroy()
{
try
{
// Remove the notification from the status bar.
var notificationManager = (NotificationManager)GetSystemService(NotificationService);
notificationManager.Cancel(SERVICE_RUNNING_NOTIFICATION_ID);
managedStop();
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex.ToString());
}
}
public static void cancelJobById(Context ctx, int jobID)
{
try
{
if (allJobs.ContainsKey(jobID))
{
JobCallbacks job = allJobs[jobID];
var manager = (JobSchedulerType)ctx.GetSystemService(Context.JobSchedulerService);
manager.Cancel(job.JobUniqueID);
allJobs.Remove(jobID);
}
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex);
}
}
public static void GetLatestWifiScanResults(bool isUpToDate = true)
{
if (!myWifiManager.IsWifiEnabled)
{
AndroidBridge.WifiScanningCallback?.Invoke(null, null, new Exception("Wifi is not on"));
return;
}
try
{
IList <ScanResult> scanwifinetworks = myWifiManager.ScanResults;
List <string> allWifis = new List <string>();
// Ignore if fail, we get many in between scans
if (isUpToDate)
{
if (scanwifinetworks.Count > 0)
{
long timeOfScan = (scanwifinetworks.Max(s => s.Timestamp)) / 1000;
long currentTime = SystemClock.ElapsedRealtime();
TimeSpan timeSinceLastScan = TimeSpan.FromMilliseconds(currentTime - timeOfScan);
foreach (ScanResult wifinetwork in scanwifinetworks)
{
allWifis.Add(wifiDesc(wifinetwork));
}
AndroidBridge.WifiScanningCallback?.Invoke(allWifis, timeSinceLastScan, null);
}
}
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex);
try
{
AndroidBridge.WifiScanningCallback?.Invoke(null, null, ex);
}
catch (Exception ex2)
{
AndroidLevelLogger.e(TAG, ex2);
}
}
}
public override void OnReceive(Context context, Intent intent)
{
// Try to stop scan in a different "try\e"
try
{
//https://stackoverflow.com/questions/4499915/how-to-stop-wifi-scan-on-android
context.UnregisterReceiver(this);
//InvokeAbortBroadcast not here:
// https://medium.com/@ssaurel/develop-a-wifi-scanner-android-application-daa3b77feb73
//InvokeAbortBroadcast();
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex);
}
GetLatestWifiScanResults(intent.GetBooleanExtra(WifiManager.ExtraResultsUpdated, false));
AndroidLevelLogger.d(TAG, "Wifi scan result sucess");
}
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
// Called everytime someone try to start (even if already started) or stop us or custom even we set up.
try
{
if (intent.Action != null)
{
switch (intent.Action)
{
case ACTION_START_SERVICE:
// Will have no affect if already running:
// (onCreate will not called)
StartMyForegroundService();
break;
case ACTION_RESTART_SERVICE:
managedStop();
managedStart();
break;
case ACTION_STOP_SERVICE:
managedStop();
StopMyForegroundService();
break;
default:
break;
}
}
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex.ToString());
}
return(StartCommandResult.Sticky);
}
public override bool OnStartJob(JobParameters @params)
{
bool shouldJobContinue = false;
int jobID = @params.JobId;
bool hasUserFinished = false;
bool invokeErrors = false;
try
{
JobCallbacks callbacks = allJobs[jobID];
Action <bool> jobFinishedProxy =
(bool wantsReschedule) => {
hasUserFinished = true;
JobFinished(@params, wantsReschedule);
};
callbacks.onJob?.Invoke(jobFinishedProxy);
shouldJobContinue = callbacks.shouldContinue?.Invoke() ?? shouldJobContinue;
}
catch (Exception ex)
{
invokeErrors = true;
AndroidLevelLogger.e(TAG, ex);
}
if (invokeErrors || (hasUserFinished && !shouldJobContinue))
{
shouldJobContinue = false;
if (allJobs.ContainsKey(jobID))
{
allJobs.Remove(jobID);
}
}
return(shouldJobContinue);
}
public override IBinder OnBind(Intent intent)
{
AndroidLevelLogger.d(TAG, "OnBind");
return(null);
}
public static bool scheduleJob(Context ctx, JobCallbacks callbacks, TimeSpan?minLatency, TimeSpan?maxLatency, TimeSpan?interval = null,
bool requireIdle = false, bool requireCharger = false, NetworkType requiredNet = NetworkType.Any,
bool requireAboveLowBattery = false, bool requireAboveLowStorage = false)
{
int jobID = -1;
bool success = false;
jobID = callbacks.JobUniqueID;
allJobs.Add(jobID, callbacks);
try
{
ComponentName JobServiceComponent = new ComponentName(ctx, Java.Lang.Class.FromType(typeof(PeriodicTask)));
var jobBuilder = new JobInfo
.Builder(jobID, JobServiceComponent)
.SetRequiresDeviceIdle(requireIdle)
.SetRequiresCharging(requireCharger)
.SetRequiredNetworkType(requiredNet)
.SetRequiresBatteryNotLow(requireAboveLowBattery)
.SetRequiresStorageNotLow(requireAboveLowStorage)
;
long intervalMillisecond = (long)(interval?.TotalMilliseconds ?? 0);
if (intervalMillisecond > 0L)
{
if (intervalMillisecond < JobInfo.MinPeriodMillis)
{
throw new Exception("Period interval must be at least: " + JobInfo.MinPeriodMillis);
}
jobBuilder.SetPeriodic(intervalMillisecond);
}
else
{
jobBuilder.SetMinimumLatency((long)(minLatency?.TotalMilliseconds ?? 0L));
jobBuilder.SetOverrideDeadline((long)(maxLatency?.TotalMilliseconds ?? 0L));
}
JobInfo job = jobBuilder.Build();
var manager = (JobSchedulerType)ctx.GetSystemService(Context.JobSchedulerService);
var status = manager.Schedule(job);
if (status != JobSchedulerType.ResultSuccess)
{
AndroidLevelLogger.e(TAG, "Job schedule failed for id: " + jobID);
success = false;
}
else
{
success = true;
}
}
catch (Exception ex)
{
AndroidLevelLogger.e(TAG, ex);
}
if (!success && allJobs.ContainsKey(jobID))
{
allJobs.Remove(jobID);
}
return(success);
}
public void setupAndroidBridge()
{
Context global_ctx = Application.Context;
AndroidBridge._log_d = new Action <string, string>((tag, msg) =>
{
AndroidLevelLogger.d(tag, msg);
});
AndroidBridge._log_e = new Action <string, string>((tag, msg) =>
{
AndroidLevelLogger.e(tag, msg);
});
AndroidBridge._toast = new Action <string>((msg) =>
{
try
{
AndroidUtils.ToastIt(global_ctx, msg);
}
catch (Exception ex)
{
Log.Error(AndroidBridge.TAG, ex.ToString());
}
});
AndroidBridge._toast_from_back = new Action <string>((msg) =>
{
try
{
AndroidUtils.ToastItFromBack(global_ctx, msg);
}
catch (Exception ex)
{
Log.Error(AndroidBridge.TAG, ex.ToString());
}
});
AndroidBridge._readAsset = new Func <string, string, string>((tag, asset_name) =>
{
string result = "";
try
{
result = FileHelpers.ReadAssetAsString(global_ctx, tag, asset_name);
}
catch (Exception ex)
{
Log.Error(AndroidBridge.TAG, ex.ToString());
}
return(result);
});
AndroidBridge._get_absolute_path = new Func <string, bool, string>((relative, isPulic) =>
{
string result = "";
try
{
if (isPulic)
{
result = FileHelpers.getPublicAppFilePath(global_ctx, relative);
}
else
{
result = FileHelpers.getInternalAppFilePath(global_ctx, relative);
}
}
catch (Exception ex)
{
Log.Error(AndroidBridge.TAG, ex.ToString());
}
return(result);
});
WifiScan.InitWifiScan(global_ctx);
AndroidBridge._start_wifi_scan = new Action(() =>
{
WifiScan.StartScanning(global_ctx);
});
AndroidBridge._get_wifi_now = new Action(() =>
{
WifiScan.WifiReceiver.GetLatestWifiScanResults();
});
AndroidBridge._start_service = new Action(() =>
{
MyForegroundService.StartForegroundServiceCompat <MyForegroundService>(global_ctx, MyForegroundService.ACTION_START_SERVICE);
});
AndroidBridge._stop_service = new Action(() =>
{
MyForegroundService.StartForegroundServiceCompat <MyForegroundService>(global_ctx, MyForegroundService.ACTION_STOP_SERVICE);
});
AndroidBridge._is_service_up = new Func <bool>(() =>
{
return(MyForegroundService.IsServiceUp());
});
AndroidBridge._stop_all_jobs = () =>
{
PeriodicTask.cancelAllJobs(global_ctx);
};
AndroidBridge._stop_job = (int id) =>
{
PeriodicTask.cancelJobById(global_ctx, id);
};
AndroidBridge._schedule_job = new Func <
TimeSpan?, TimeSpan?, TimeSpan?, Action <Action <bool> >, Func <bool>, Action, Func <bool>, int>(
(latency, maxLatency, interval, _onJob, _shouldContinue, _onJobRequirementAbort, _shouldRetryAfterAbort) =>
{
PeriodicTask.JobCallbacks job = new PeriodicTask.JobCallbacks()
{
onJob = _onJob,
shouldContinue = _shouldContinue,
onJobRequirementAbort = _onJobRequirementAbort,
shouldRetryAfterAbort = _shouldRetryAfterAbort
};
if (PeriodicTask.scheduleJob(global_ctx, job, latency, maxLatency, interval))
{
return(job.JobUniqueID);
}
return(-1);
}
);
}