Develop Reference

Repeating notifications issue

I'm struggling with notifications.
I want to randomly select text to display in the notification (using random() method on the array of String objects from separate object file NotificationData where I only had one immutable variable called notificationData), which should appear once a day at a specific time (but for now, for the purpose of the test, I wrote in the code to appear every hour). I'm using AlarmManager for scheduling. The first thing is the notifications does not appear at the specified hour when the app is not currently working (or during the device sleep mode), but after launching the app. And second thing is that after launching the app, notifications appear almost one by one within few seconds. I don't really understand why it happens in this way. It's quite strange for me.
Here's the NotificationUtils class, where I create my notification and put one String from Array inside setContentText() method:
package com.example.quit.notification
class NotificationUtils(context: Context) {
private var mContext = context
private lateinit var notificationBuilder: NotificationCompat.Builder
val notificationManager = NotificationManagerCompat.from(mContext)
private val CHANNEL_ID = "Notification_Channel"
init {
createNotificationChannel()
initNotificationBuilder()
}
fun launchNotification() {
with(NotificationManagerCompat.from(mContext)) {
notificationManager.notify(0, notificationBuilder.build())
}
}
private fun createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val name = "Rady"
val description = "Codzienne rady dla zdrowiejących osób uzależnionych"
val importance = NotificationManager.IMPORTANCE_DEFAULT
val channel = NotificationChannel(CHANNEL_ID, name, importance).apply {
this.description = description
}
val notificationManager: NotificationManager = mContext.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
notificationManager.createNotificationChannel(channel)
}
}
private fun initNotificationBuilder() {
val sampleIntent = Intent(mContext, MainActivity::class.java).apply {
flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
}
val pendingIntent: PendingIntent = PendingIntent.getActivity(mContext, 0, sampleIntent, 0)
val data = NotificationData.notificationData.random()
notificationBuilder = NotificationCompat.Builder(mContext, CHANNEL_ID)
.setSmallIcon(R.drawable.ic_support)
.setContentTitle("Rada na dziś")
.setContentText(data)
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setContentIntent(pendingIntent)
.setAutoCancel(true)
}
}
Second class, where I create repeating alarm:
package com.example.quit.notification
#SuppressLint("UnspecifiedImmutableFlag")
class AlarmUtils(context: Context) {
private var mContext = context
private var alarmManager: AlarmManager? = null
private var alarmIntent: PendingIntent
init {
alarmManager = mContext.getSystemService(Context.ALARM_SERVICE) as AlarmManager
alarmIntent = Intent(mContext, AlarmReceiver::class.java).let { mIntent ->
PendingIntent.getBroadcast(mContext, 100, mIntent, PendingIntent.FLAG_UPDATE_CURRENT)
}
}
fun initRepeatingAlarm(calendar: Calendar) {
calendar.apply {
set(Calendar.HOUR_OF_DAY, 20)
set(Calendar.MINUTE, 30)
set(Calendar.SECOND, 0)
}
alarmManager?.set(
AlarmManager.RTC_WAKEUP,
calendar.timeInMillis,
alarmIntent
)
}
}
Here's my AlarmReceiver, where I set next alarm after one hour in this case (:
package com.example.quit.notification
class AlarmReceiver : BroadcastReceiver() {
override fun onReceive(context: Context?, intent: Intent?) {
val notificationUtils = NotificationUtils(context!!)
notificationUtils.launchNotification()
val calendar = Calendar.getInstance()
calendar.add(Calendar.HOUR_OF_DAY, 1)
val alarmUtils = AlarmUtils(context)
alarmUtils.initRepeatingAlarm(calendar)
}
}
In AndroidManifest.xml file I only added one line in tag:
<receiver android:name=".notification.AlarmReceiver" />
And the last thing - in MainActivity class I put those three lines just after setContentView() method:
val calendar = Calendar.getInstance()
val alarmUtils = AlarmUtils(this)
alarmUtils.initRepeatingAlarm(calendar)
I'll be very grateful for any help and explanations.

It is obvious why your notifications appear immediately. In AlarmReceiver you do this:
val calendar = Calendar.getInstance()
calendar.add(Calendar.HOUR_OF_DAY, 1)
val alarmUtils = AlarmUtils(context)
alarmUtils.initRepeatingAlarm(calendar)
You want to take the current time, add one hour and schedule an alarm at that time (1 hour in the future). However, look at what initRepeatingAlarm() is doing:
calendar.apply {
set(Calendar.HOUR_OF_DAY, 20)
set(Calendar.MINUTE, 30)
set(Calendar.SECOND, 0)
}
in initRepeatingAlarm() you are setting the hour, minute and seconds to a fixed value (which is the time that the alarm originally went off). You are overwriting the time that was set in the Calendar that was passed in. In this case, when the alarm is set, the time is in the past so the alarm triggers immediately.
Regarding why the alarms do not work when the device is sleeping, the call to AlarmManager.set() is not considered "exact" and the system may delay the alarm to ensure that the device is not constantly awakened (preservation of battery). See this explanation found in the documentation.
If you want the alarm to go off at exactly this time, you need to use a different method, such as setExact(), and you will need to declare an additional permission SCHEDULE_EXACT_ALARM (if you target API level 31 or higher)

Geofencing api not working in android with pending intent

I'm trying to implement simple geofence app but its not getting triggered at all.
here is the code of what I've done so far -
class GeoFencingHelper(context: Context, private val task: Task, private val pendingIntent: PendingIntent){
private val geofencingClient = LocationServices.getGeofencingClient(context)
init {
Timber.e(task.id.toString())
}
#SuppressLint("MissingPermission")
fun initiateGeoFencing() {
val geoReq = createGeoFenceList()
geofencingClient.addGeofences(geoReq, pendingIntent).apply {
addOnSuccessListener {
Timber.e("added geofence!")
}
addOnFailureListener {
Timber.e("geofence failed!")
}
}
}
private fun createGeoFenceList(): GeofencingRequest {
val geofenceList = arrayListOf<Geofence>()
geofenceList.add(Geofence.Builder().apply {
setRequestId(task.id.toString())
setCircularRegion(
task.location.latitude,
task.location.longitude,
task.range.toFloat()
)
// Set the expiration duration of the geofence. This geofence gets automatically
// removed after this period of time.
setExpirationDuration(Geofence.NEVER_EXPIRE)
setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER or Geofence.GEOFENCE_TRANSITION_EXIT)
// Create the geofence.
}.build())
return getGeofencingRequest(geofenceList)
}
private fun getGeofencingRequest(
fenceList: List<Geofence>,
): GeofencingRequest {
return GeofencingRequest.Builder().apply {
setInitialTrigger(
if(task.reminderCondition == ReminderCondition.ON_ENTRY)
GeofencingRequest.INITIAL_TRIGGER_ENTER
else
GeofencingRequest.INITIAL_TRIGGER_EXIT)
addGeofences(fenceList)
}.build()}
I'm adding geofencing here
fun createGeoFence(context: Context, task: Task){
val geofencePendingIntent: PendingIntent by lazy {
task.range = 150.0
val intent = Intent(context, ReminderNotificationBroadcastReceiver::class.java)
intent.putExtra(TASK_ID, task.id)
if(Build.VERSION.SDK_INT > 30){
PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE)
}else{
PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
}
}
val geoFencingHelper = GeoFencingHelper(context, task, geofencePendingIntent)
geoFencingHelper.initiateGeoFencing()}
here is the broadcast receiver to show notification to user when geofence event gets triggered.
class ReminderNotificationBroadcastReceiver #Inject constructor(private val dao: TaskDao): BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
val builder = NotificationCompat.Builder(context, "2222")
.setSmallIcon(R.drawable.ic_launcher_background)
.setContentTitle("Reminder \"\".")
.setContentText("Reminder \".")
.setOngoing(true)
.setColor(Color.BLUE)
with(NotificationManagerCompat.from(context)) {
notify(2222, builder.build())
}}}
things I've done so far -
disabled battery optimization.
background location permission is allowed all the time.
Issue -
I used mock location apps like lockito and gps emulator to test the app.
but the geofence event is not getting triggered, I also tried to build and test sample project provided by android codelab, but I'm facing same issue in that app as well.

There are similar questions on SO and on the net but in short, Google codelab is not up to date for this. The PendingIntent used for Geofencing needs to be mutable for it to work. So in your case:
fun createGeoFence(context: Context, task: Task){
val geofencePendingIntent: PendingIntent by lazy {
....
if(Build.VERSION.SDK_INT > 30){
PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE)
} else{
PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
}
}
or just like this without the if as PendingIntent is mutable by default up until Build.VERSION_CODES.R:
fun createGeoFence(context: Context, task: Task){
val geofencePendingIntent: PendingIntent by lazy {
....
PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE)
}

How to set an alarm on Android Q?

Background
Android Q seems to have plenty of new restrictions, but alarms shouldn't be one of them:
https://developer.android.com/guide/components/activities/background-starts
The problem
It seems that old code that I made for setting an alarm, which worked fine on P, can't work well anymore:
MainActivity.kt
class MainActivity : AppCompatActivity() {
private lateinit var manager: AlarmManager
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
manager = getSystemService(Context.ALARM_SERVICE) as AlarmManager
button.setOnClickListener {
Log.d("AppLog", "alarm set")
Toast.makeText(this, "alarm set", Toast.LENGTH_SHORT).show()
val timeToTrigger = System.currentTimeMillis() + 10 * 1000
setAlarm(this, timeToTrigger, 1)
}
}
companion object {
fun setAlarm(context: Context, timeToTrigger: Long, requestId: Int) {
val manager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
val pendingIntent = PendingIntent.getBroadcast(context, requestId, Intent(context, AlarmReceiver::class.java), PendingIntent.FLAG_UPDATE_CURRENT)
when {
VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP -> manager.setAlarmClock(AlarmClockInfo(timeToTrigger, pendingIntent), pendingIntent)
VERSION.SDK_INT >= VERSION_CODES.KITKAT -> manager.setExact(AlarmManager.RTC_WAKEUP, timeToTrigger, pendingIntent)
else -> manager.set(AlarmManager.RTC_WAKEUP, timeToTrigger, pendingIntent)
}
}
}
}
The receiver does get the Intent, but when it tries to open the Activity, sometimes nothing occurs:
AlarmReceiver.kt
class AlarmReceiver : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
Log.d("AppLog", "AlarmReceiver onReceive")
context.startActivity(Intent(context, Main2Activity::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
}
}
Seeing this as a bug, I reported here (including sample code)
What I've tried
I tried to find what's new on Q, to see what could cause it, and I couldn't find it.
I also tried (if you look at the code) to directly open the Activity instead of via a BroadcastReceiver.
And, I tried to set the BroadcastReceiver to run on a different process.
All of those didn't help.
What I have found is that while some alarm clock apps fail to work properly (such as Timely), some apps work just fine (such as "Alarm Clock Xtreme").
The questions
On Android Q, is there an official way to let alarms work correctly? To open an Activity that will be shown to the user, exactly as an alarm clock app should?
What's wrong in the code I've made? How come it works on P but not always on Q?
EDIT: OK after being adviced to have a notification shown while I start the Activity, and also use FullScreenIntent, I got something to work, but it's only working when the screen is turned off. When the screen is turned on, it only shows the notification, which is a bad thing because the whole point is to have an alarm being shown to the user, and some users (like me) don't want to have heads-up-notification for alarms, popping out in the middle of something and not pausing anything. I hope someone can help with this, as this used to be a very easy thing to do, and now it got way too complex...
Here's the current code (available here) :
NotificationId
object NotificationId {
const val ALARM_TRIGGERED = 1
#JvmStatic
private var hasInitialized = false
#UiThread
#JvmStatic
fun initNotificationsChannels(context: Context) {
if (hasInitialized || Build.VERSION.SDK_INT < Build.VERSION_CODES.O)
return
hasInitialized = true
val channelsToUpdateOrAdd = HashMap<String, NotificationChannel>()
val channel = NotificationChannel(context.getString(R.string.channel_id__alarm_triggered), context.getString(R.string.channel_name__alarm_triggered), NotificationManager.IMPORTANCE_HIGH)
channel.description = context.getString(R.string.channel_description__alarm_triggered)
channel.enableLights(true)
channel.setSound(null, null)
channel.lockscreenVisibility = Notification.VISIBILITY_PUBLIC
channel.enableVibration(false)
channel.setShowBadge(false)
channelsToUpdateOrAdd[channel.id] = channel
//
val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
val existingChannels = notificationManager.notificationChannels
if (existingChannels != null)
for (existingChannel in existingChannels) {
// The importance of an existing channel will only be changed if the new importance is lower than the current value and the user has not altered any settings on this channel.
// The group an existing channel will only be changed if the channel does not already belong to a group. All other fields are ignored for channels that already exist.
val channelToUpdateOrAdd = channelsToUpdateOrAdd[existingChannel.id]
if (channelToUpdateOrAdd == null) //|| channelToUpdateOrAdd.importance > existingChannel.importance || (existingChannel.group != null && channelToUpdateOrAdd.group != existingChannel.group))
notificationManager.deleteNotificationChannel(existingChannel.id)
}
for (notificationChannel in channelsToUpdateOrAdd.values) {
notificationManager.createNotificationChannel(notificationChannel)
}
}
}
MyService.kt
class MyService : Service() {
override fun onBind(p0: Intent?): IBinder? = null
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
Log.d("AppLog", "MyService onStartCommand")
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationId.initNotificationsChannels(this)
val builder = NotificationCompat.Builder(this, getString(R.string.channel_id__alarm_triggered)).setSmallIcon(android.R.drawable.sym_def_app_icon) //
.setPriority(NotificationCompat.PRIORITY_HIGH).setCategory(NotificationCompat.CATEGORY_ALARM)
builder.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
builder.setShowWhen(false)
builder.setContentText("Alarm is triggered!")
builder.setContentTitle("Alarm!!!")
val fullScreenIntent = Intent(this, Main2Activity::class.java)
val fullScreenPendingIntent = PendingIntent.getActivity(this, 0,
fullScreenIntent, PendingIntent.FLAG_UPDATE_CURRENT)
builder.setFullScreenIntent(fullScreenPendingIntent, true)
startForeground(NotificationId.ALARM_TRIGGERED, builder.build())
startActivity(Intent(this, Main2Activity::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
Handler().postDelayed({
stopForeground(true)
stopSelf()
}, 2000L)
} else {
startActivity(Intent(this, Main2Activity::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
}
return super.onStartCommand(intent, flags, startId)
}
}
MainActivity.kt
class MainActivity : AppCompatActivity() {
private lateinit var manager: AlarmManager
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
manager = getSystemService(Context.ALARM_SERVICE) as AlarmManager
button.setOnClickListener {
Log.d("AppLog", "alarm set")
Toast.makeText(this, "alarm set", Toast.LENGTH_SHORT).show()
val timeToTrigger = System.currentTimeMillis() + 10 * 1000
setAlarm(this, timeToTrigger, 1)
}
}
companion object {
fun setAlarm(context: Context, timeToTrigger: Long, requestId: Int) {
val manager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
val pendingIntent = PendingIntent.getBroadcast(context, requestId, Intent(context, AlarmReceiver::class.java), PendingIntent.FLAG_UPDATE_CURRENT)
// val pendingIntent = PendingIntent.getBroadcast(context, requestId, Intent(context, Main2Activity::class.java), PendingIntent.FLAG_UPDATE_CURRENT)
// val pendingIntent = PendingIntent.getService(context, requestId, Intent(context, MyService::class.java), PendingIntent.FLAG_UPDATE_CURRENT)
when {
VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP -> manager.setAlarmClock(AlarmClockInfo(timeToTrigger, pendingIntent), pendingIntent)
VERSION.SDK_INT >= VERSION_CODES.KITKAT -> manager.setExact(AlarmManager.RTC_WAKEUP, timeToTrigger, pendingIntent)
else -> manager.set(AlarmManager.RTC_WAKEUP, timeToTrigger, pendingIntent)
}
}
}
}
AlarmReceiver.kt
class AlarmReceiver : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
Log.d("AppLog", "AlarmReceiver onReceive")
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(Intent(context, MyService::class.java))
} else context.startService(Intent(context, MyService::class.java))
}
}

What's wrong in the code I've made? How come it works on P but not always on Q?
You are attempting to start an activity from the background. That is banned on Android 10+ for the most part.
According to the docs, alarms shouldn't be harmed.
From the material that you quoted, with emphasis added: "The app receives a notification PendingIntent from the system". You are not using notifications. And, therefore, this exception does not apply.
On Android Q, is there an official way to let alarms work correctly? To open an Activity that will be shown to the user, exactly as an alarm clock app should?
Use a notification with a full-screen Intent, as is covered in the documentation. If the screen is locked, your activity will be displayed when the notification is raised. If the screen is unlocked, a high-priority ("heads up") notification will be displayed instead. In other words:
If the device is not being used, you get what you want
If the device is probably being used, the user find out about the event without your taking over the screen, so you do not interfere with whatever the user is doing (e.g., relying on a navigation app while driving)

Sending notification via AlarmManager and BroadcastReceiver does not work?

I'm scheduling a notification for 5 days ahead, so I create an alarm using the AlarmManager who fires a PendingIntent which triggers my BroadcastReceiver.
If I try the code for 10 seconds, it works. When I try it for 5 days, nothing happens.
The class NotificationScheduler is a helper class for setting and updating alarms.
The fire-dates are correct since I store them in a database, and I already proofed it.
Manifest:
<receiver android:name=".reminder.ReminderReceiver" />
NotificationScheduler:
class NotificationScheduler {
companion object {
const val NOTIFICATION_EXTRA_CLAIM_ID = "notification_extra_bookentry_id"
const val INTENT_ACTION_REMINDER = "at.guger.moneybook.reminder"
fun setReminder(context: Context, bookEntryId: Long, fireDate: Date? = null) {
val mCalendar = Calendar.getInstance()
val lFireDate = if (fireDate == null) {
mCalendar.timeInMillis += 5 * 24 * 3600 * 1000
mCalendar.set(Calendar.HOUR_OF_DAY, 12)
mCalendar.time
} else {
fireDate
}
create(context, bookEntryId, lFireDate.time)
AppDatabase.getInstance(context).reminderDao().insert(Reminder(bookEntryId, lFireDate))
}
fun updateReminder(context: Context, bookEntryId: Long) {
cancel(context, bookEntryId)
val mCalendar = Calendar.getInstance()
mCalendar.timeInMillis += 5 * 24 * 3600 * 1000
mCalendar.set(Calendar.HOUR_OF_DAY, 12)
create(context, bookEntryId, mCalendar.timeInMillis)
AppDatabase.getInstance(context).reminderDao().update(Reminder(bookEntryId, mCalendar.time))
}
fun cancelReminder(context: Context, bookEntryId: Long) {
cancel(context, bookEntryId)
AppDatabase.getInstance(context).reminderDao().delete(Reminder(bookEntryId))
}
private fun create(context: Context, bookEntryId: Long, fireDate: Long) {
val mAlarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
val mComponentName = ComponentName(context, ReminderReceiver::class.java)
context.packageManager.setComponentEnabledSetting(mComponentName, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP)
val mIntent = Intent(context, ReminderReceiver::class.java)
mIntent.action = INTENT_ACTION_REMINDER
mIntent.putExtra(NOTIFICATION_EXTRA_CLAIM_ID, bookEntryId)
val mPendingIntent = PendingIntent.getBroadcast(context, bookEntryId.toInt(), mIntent, PendingIntent.FLAG_UPDATE_CURRENT)
if (Utils.isKitKat()) {
mAlarmManager.setWindow(AlarmManager.RTC, fireDate, AlarmManager.INTERVAL_HOUR, mPendingIntent)
} else {
mAlarmManager.set(AlarmManager.RTC, fireDate, mPendingIntent)
}
}
private fun cancel(context: Context, bookEntryId: Long) {
val mAlarmManager: AlarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
val mComponentName = ComponentName(context, ReminderReceiver::class.java)
context.packageManager.setComponentEnabledSetting(mComponentName, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP)
val mIntent = Intent(context, ReminderReceiver::class.java)
mIntent.putExtra(NOTIFICATION_EXTRA_CLAIM_ID, bookEntryId)
val mPendingIntent = PendingIntent.getBroadcast(context, bookEntryId.toInt(), mIntent, PendingIntent.FLAG_UPDATE_CURRENT)
mAlarmManager.cancel(mPendingIntent)
mPendingIntent.cancel()
}
}
}
BroadcastReceiver:
class ReminderReceiver : BroadcastReceiver() {
override fun onReceive(context: Context?, intent: Intent?) {
if (context != null && intent != null) {
when (intent.action) {
NotificationScheduler.INTENT_ACTION_REMINDER -> {
val mPowerManager = context.getSystemService(Context.POWER_SERVICE) as PowerManager
val mWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, this::class.simpleName)
mWakeLock.acquire(WAKELOCK_TIME)
val iClaimEntryId = intent.getLongExtra(NotificationScheduler.NOTIFICATION_EXTRA_CLAIM_ID, -1)
showNotification(context, iClaimEntryId)
AppDatabase.getInstance(context).reminderDao().delete(Reminder(iClaimEntryId))
mWakeLock.release()
}
}
}
}
private fun showNotification(context: Context, claimEntryId: Long) {
val mNotificationManager: NotificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
val nBuilder: Notification.Builder
if (Utils.isOreo()) {
val mNotificationChannel = NotificationChannel(NOTIFICATIONCHANNEL_CLAIMREMINDERID, context.getString(R.string.notificationchannel_claimreminder_title), NotificationManager.IMPORTANCE_DEFAULT)
mNotificationChannel.description = context.getString(R.string.notificationchannel_claimreminder_description)
mNotificationManager.createNotificationChannel(mNotificationChannel)
nBuilder = Notification.Builder(context, NOTIFICATIONCHANNEL_CLAIMREMINDERID)
} else {
nBuilder = Notification.Builder(context)
}
val mClaimEntry: BookEntry = AppDatabase.getInstance(context).bookEntryDao().get(claimEntryId)
val mCurrencyFormatter = DecimalFormat.getCurrencyInstance(Preferences.getInstance(context).currency.locale)
nBuilder.setSmallIcon(R.drawable.ic_money)
nBuilder.setContentTitle(context.getString(R.string.notification_claimreminder_title, mCurrencyFormatter.format(mClaimEntry.dValue)))
val sContacts = mClaimEntry.getContacts(context).joinToString().takeIf { it.isNotEmpty() }
?: "-"
nBuilder.setContentText(context.getString(R.string.notification_claimreminder_content, sContacts))
nBuilder.setContentIntent(PendingIntent.getActivity(context, 0, Intent(context, MainActivity::class.java), PendingIntent.FLAG_UPDATE_CURRENT))
nBuilder.setAutoCancel(true)
mNotificationManager.notify(mClaimEntry.lId!!.toInt(), nBuilder.build())
}
companion object {
const val NOTIFICATIONCHANNEL_CLAIMREMINDERID = "notification_channel_claimreminder"
const val WAKELOCK_TIME: Long = 1000
}
}

I had issues with AlarmManager, so I am using WorkManager now.
WorkManager was introduced with Android Jetpack / Architecture Components.
Solution
First add dependency for WorkManager, you can find latest versions here.
Create a Worker class, and code for showing notification in doWork().
Schedule this work on your app start, also check if already not scheduled. I already created a method named isWorkScheduled() in below class for ease.
You can send additional data to your task (like putExtra()) by setInputData().
Schedule your one time task in first activity onCreate() or Application class onCreate.
Example
public static final String TAG_WORK = "myTag";
if(!MyWork.isWorkScheduled(TAG_WORK))
MyWork.scheduleOneTimeTask(TAG_WORK, 5, TimeUnit.DAYS)
MyWork.java
public class MyWork extends Worker {
public static void scheduleOneTimeTask(String tag, long duration, TimeUnit timeUnit) {
OneTimeWorkRequest compressionWork =
new OneTimeWorkRequest.Builder(MyWork.class).setInitialDelay(duration, timeUnit).addTag(tag)
.build();
WorkManager instance = WorkManager.getInstance();
if (instance != null) {
instance.enqueue(compressionWork);
}
}
private boolean isWorkScheduled(String tag) {
WorkManager instance = WorkManager.getInstance();
if (instance == null) return false;
LiveData<List<WorkStatus>> statuses = instance.getStatusesByTag(tag);
if (statuses.getValue() == null) return false;
boolean running = false;
for (WorkStatus workStatus : statuses.getValue()) {
running = workStatus.getState() == State.RUNNING | workStatus.getState() == State.ENQUEUED;
}
return running;
}
#NonNull
#Override
public Result doWork() {
// show notification
return Result.SUCCESS;
// (Returning RETRY tells WorkManager to try this task again
// later; FAILURE says not to try again.)
}
}
I suggested you WorkManger only, because I created a sample earlier
days with JobScheduler, EvernoteJobs,
AlarmManager, JobService, and WorkManager. In which I started periodic task of 15 minutes with each of these. and
wrote logs of each in separate file when invoked.
Conclusion of this test was that. WorkManager and EvernoteJobs were
most efficient to do jobs. Now because EvernoteJobs will use
WorkManager from next version. So I came up with WorkManager.
Update
Minimum time for scheduling periodic task is 15 minutes so please keep in mind. You can read more in documentation.

Is the device ever shut down during the five-day period? According to the documentation:
By default, all alarms are canceled when a device shuts down. To prevent this from happening, you can design your application to automatically restart a repeating alarm if the user reboots the device. This ensures that the AlarmManager will continue doing its task without the user needing to manually restart the alarm.
Set an alarm when the device restarts.
Another thing that comes to mind is you may want to use AlarmManager.RCT_WAKEUP instead of AlarmManager.RTC to make sure the device is awake to deliver the intent and create and dispatch your notification.
Try:
if (Utils.isKitKat()) {
mAlarmManager.setWindow(AlarmManager.RTC_WAKEUP, fireDate, AlarmManager.INTERVAL_HOUR, mPendingIntent)
} else {
mAlarmManager.set(AlarmManager.RTC_WAKEUP, fireDate, mPendingIntent)
}

Most probably , it is the case when your device is going in Doze mode and Alarm manager is not triggering your scheduled alarm
Try using( this is Java code ):
AlarmManager alarmManager = (AlarmManager)this.getSystemService(Context.ALARM_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, fireDate, pendingIntent);
}
else{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
alarmManager.setExact(AlarmManager.RTC_WAKEUP, fireDate, pendingIntent);
}
}
Take a look at setExactAndAllowWhileIdle

Kotlin AlarmManager and BroadcastReceiver not working

I'm trying to set an alarm with AlarmManager, but my BroadcastReceiver never gets called. Here is my snippet.
val receiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
//Never gets hit
}
}
context.registerReceiver(receiver, IntentFilter(LOCAL_NOTIFICATION))
val intent = Intent()
intent.action = LOCAL_NOTIFICATION
val alarmManager = context.getSystemService(ALARM_SERVICE) as? AlarmManager
val pendingIntent = PendingIntent.getService(context, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT)
val calendar = Calendar.getInstance()
calendar.add(Calendar.SECOND, 10)
alarmManager?.set(AlarmManager.RTC_WAKEUP, calendar.timeInMillis, pendingIntent)
I've tried registering a broadcast receiver in AndroidManifest.xml but nothing seems to be working.

I just noticed that I was calling getService() on PendingIntent instead of getBroadcast()
After changing that, it works perfectly!

In addition to the preferred answer, I set the class of the intent before it worked. See the example below:
val intent = Intent()
intent.action = LOCAL_NOTIFICATION
intent.setClass(context, MyBroadCastReceiver::class.java) //this line
before passing the intent to the pendintIntent.
hope it helps