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Setting multiple alarms in Android Studio with an alarmmanager causes problems

I currently have a small project running in Android Studio that I need help with. I want to include a reminder function with notifications.
I have a total of 4 time pickers for each of which I want to set an alarm at the corresponding selected time.
With my current code the planned feature works only halfway, with the following problem:
If I select one time, then I sometimes get a notification at this time as desired. However, not always on time. Most of the time the alert doesn't appear and if it does, then half a minute to a minute later. And if I set all 4 alarms, in the best case I get a notification at the last selected time. In the worst case nothing happens.
But all I want is to get daily notifications at the selected 4 times.
About my code, I use an alarm manager which I call 4 times for the 4 alarms. I also use a broadcast receiver in which the notification is triggered. And I use a different RequestCode for each PendingIntent.
I really searched all relevant posts on SO, but not one of them worked for me. Maybe I have included it in the wrong way. I hope someone can help me. Here are my methods:
Alarm method from Activity.class
(UhrzeitInMillis describes the chosen time by timepicker, for example 16.03):
public void SetAlarm(Context context, long UhrzeitInMillis) {
Intent intent = new Intent(context, Optionen_Alarm.class);
final int id = (int) System.currentTimeMillis();
PendingIntent pendingIntent = PendingIntent.getBroadcast(
this.getApplicationContext(), id, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, UhrzeitInMillis, AlarmManager.INTERVAL_DAY, pendingIntent);
}
BroadcastReceiver (Optionen_Alarm.java):
public class Optionen_Alarm extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "myapp:mywakelocktag");
wl.acquire();
createNotificationChannel(context);
NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "1");
builder.setContentTitle("titel");
builder.setContentText("text!");
builder.setSmallIcon(R.drawable.picture);
builder.setColor(context.getResources().getColor(R.color.red));
builder.setVibrate(new long[]{0, 300, 300, 300});
builder.setLights(Color.WHITE, 1000, 5000);
builder.setAutoCancel(true);
builder.setPriority(NotificationCompat.PRIORITY_HIGH);
builder.setStyle(new NotificationCompat.BigTextStyle().bigText("text!"));
Intent notifyIntent = new Intent(context, Activity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 2, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(pendingIntent);
Notification notificationCompat = builder.build();
NotificationManagerCompat managerCompat = NotificationManagerCompat.from(context);
managerCompat.notify(15, notificationCompat);
wl.release();
private void createNotificationChannel(Context context) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
CharSequence name = "name";
String description = "description";
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel channel = new NotificationChannel("1", name, importance);
channel.setDescription(description);
NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
}
}
```java

For battery reason, from android 6.0 the time you set on the alarm manager will not be guaranteed to trigger at the exact same time you have set. You could use the method '''setExactAndAllowWhileIdle()''' to make the alarm behave like you want.
You can read more about this here https://developer.android.com/training/scheduling/alarms

Notification not Showing from Service

I searched many other questions related to this topic but found not satisfactory answer also none of them are working for me.
I want to show a continuous notification which should only be terminated by app. But the code i wrote was working a few days ago but not now.
private void GenNotification(String title, String body)
{
try
{
Log.i(Config.TAGWorker, "Generating Notification . . .");
Intent myIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(
this,
0,
myIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
Notification notification = new NotificationCompat.Builder(this)
.setContentTitle(title)
.setContentText(body)
.setChannelId("myID")
.setTicker("Notification!")
.setWhen(System.currentTimeMillis())
.setContentIntent(pendingIntent)
.setDefaults(Notification.DEFAULT_SOUND)
.setAutoCancel(false)
.setSmallIcon(R.drawable.floppy)
.setOngoing(true)
.build();
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Service.NOTIFICATION_SERVICE);
mNotificationManager.notify(1, notification);
}
catch (Exception e)
{
Log.e(Config.TAGWorker, e.getMessage());
}
}
There is no exception recorded in Logcat, regarding ths. The code is called in onCreate of service. The service is starting correctly i can see in Log cat also there is no exception but notification is not shown. My OS is Android ONE for nokia (PI)

You are using a deprecated NotificationCompat.Builder constructor which takes a single argument (context); and that won't work on starting from Android 8.0 (API level 26).
So, to solve this:
Step 1: Create a Notification channel with the NotificationManager
NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// Notification channels are only available in OREO and higher.
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel notificationChannel = new NotificationChannel
("PRIMARY_CHANNEL_ID",
"Service",
NotificationManager.IMPORTANCE_HIGH);
notificationChannel.enableLights(true);
notificationChannel.setLightColor(Color.RED);
notificationChannel.enableVibration(true);
notificationChannel.setDescription("Description");
mNotificationManager.createNotificationChannel(notificationChannel);
}
Note: changeargument values as you wish
Step 2:: Use the non-deprecated Notification.Builder class with its two-argument constructor that takes a second argument as the channel ID which you assigned in the first step, where I set it to "PRIMARY_CHANNEL_ID"
Notification notification = new NotificationCompat.Builder
(this, "PRIMARY_CHANNEL_ID")
.setContentTitle("title")
.setContentText("body")
.setTicker("Notification!")
.setWhen(System.currentTimeMillis())
.setContentIntent(pendingIntent)
.setSmallIcon(R.drawable.ic_launcher_background)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setOngoing(true)
.setDefaults(NotificationCompat.DEFAULT_ALL)
.setAutoCancel(true)
.build();
mNotificationManager.notify(0, notification);

Did you check your strings (title and body) is not null if it's null notification wont show
Also check that you call your notification channels when you start your service every time if your android above 7.0
Clear notification when you recall it same id in your case is 1.

Not able to clear notification and open fragment from notification

I am trying to clear notification. But it remains there. Not able to open fragment Activity from notification. Below is my code,
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
int sticky;
try {
AndroidLogger.log(5, TAG, "Missed call notification on start");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
int importance = NotificationManager.IMPORTANCE_HIGH; //Important for heads-up notification
NotificationChannel channel = new NotificationChannel("1", "Call Notification", importance);
channel.setDescription("Get alert for missed call");
channel.setShowBadge(true);
channel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
Intent notifyIntent = new Intent(this, ViewFragment.class);
notifyIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pIntent = PendingIntent.getActivity(this, 0, notifyIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this, "1")
.setSmallIcon(R.drawable.nexge_logo)
.setContentTitle("Missed Call")
.setContentText(intent.getStringExtra("Number"))
.setContentIntent(pIntent)
.setAutoCancel(true)
.setPriority(Notification.PRIORITY_MAX);
Notification buildNotification = mBuilder.build();
NotificationManager mNotifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
//mNotifyMgr.notify(1, buildNotification);
startForeground(1,buildNotification);
} catch (Exception exception) {
AndroidLogger.error(1, TAG, "Exception while starting service", exception);
}
return START_NOT_STICKY;
}
}
Anybody help me to solve this. Thanks in Advance.
Below is my another question for which I didn't get a proper answer. Help me with that also
About Notification for Missed Call in android

My solution to a similar issue has been changing PendingIntent Flag to PendingIntent.FLAG_ONE_SHOT
From Android documentation:
Flag indicating that this PendingIntent can be used only once. For use with getActivity(Context, int, Intent, int), getBroadcast(Context, int, Intent, int), and getService(Context, int, Intent, int).
If set, after send() is called on it, it will be automatically canceled for you and any future attempt to send through it will fail.
and adding notification FLAG_AUTO_CANCEL flag:
mBuilder.flags |= Notification.FLAG_AUTO_CANCEL;
which should make sure the notification will be removed once used.
Edit:
Should call
Notification notification = mBuilder.build();
first, then
notification.flags = Notification.FLAG_AUTO_CANCEL;
Edit2:
Just noticed that you are using the notification for startForeground(). This means that the notification will stay for as long as your Service / Activity is running (this is by default so the user will know that there is a Service / Activity still running).
The notification will stay for as long as your Service / Activity does run as foreground service.

Notification cancelled immediately on Samsung Galaxy S6 android 7

I created a notification using this code:
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
final int notificationID = NotificationID.getID();
PendingIntent pendingIntent = PendingIntent.getActivity(this, notificationID, intent, PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.notif_icon)
.setContentTitle(messageTitle)
.setStyle(new NotificationCompat.BigTextStyle().bigText(messageTitle + "\n" +messageBody))
.setContentText(messageTitle + " " +messageBody)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(notificationID, notificationBuilder.build());
This works well on many devices, however on a Samsung Galaxy S6 android 7 the notification is cancelled immediately.
I tried putting the ongoing flag and the notification remains visible, however this is not a solution because the user won't be able to cancel it be swiping the notification.
Any idea what might cause the problem?

Remove setAutoCancel(true) from your code.
setAutoCancel()
Notification.Builder setAutoCancel (boolean autoCancel) Make this
notification automatically dismissed when the user touches it.
Reference: https://developer.android.com/reference/android/app/Notification.Builder.html#setAutoCancel(boolean)

Push Notifications - Android

I am working on a small project that involves a web interface that can send information to my android app which will display such information as Push Notifications.
But here is the thing, I am a bit confused with how to do that. As in what step will i have to take.
So I have a web interface in HTML which has a Textfield for notification Title, Content, and a submit button. I want it that when the user clicks the Submit button, the webpage will send the text that s in the Title and Content fields to my android app and then the app will just display them as push notifications.
So far on the app i have it that when you click a button on your device then it just shows a notification on the Actionbar. This is great for testing but It would be better that you can just compose your notification through a web interface.
My test Push Notification code for the app:
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent();
PendingIntent pIntent = PendingIntent.getActivity(MainActivity.this, 0, intent, 0);
// TODO: Make this accessible to exterior projects, such as web interface.
Notification notification = new Notification.Builder(MainActivity.this)
.setTicker("Notification")
.setContentTitle("Important Message")
.setContentText("This is an example of a push notification using a Navigation Manager")
.setSmallIcon(R.mipmap.ic_launcher)
.setContentIntent(pIntent)
.build();
notification.flags = Notification.FLAG_AUTO_CANCEL;
NotificationManager nManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
nManager.notify(0, notification);
}
});
If anyone could be so kind to give me a hand, it would be much appreciated.

You are right, so far so good with the notification bar, now what you need is a notification service, and google has something like that for us...
how does this works??
Take a look at the image below,
you need to register your android app in the google service, and your web interface will need an id, so everytime you want to push something to the android, your web interface instead will push it to the google server with the Id of the app, then google (no matter how) will localize your app, and even if its not running, they will get the notification,
behind the scenes there is a couple of thing that you must do, bu nothing like launching rockets from the NASA.
I will suggest to take a look to some tutorials
in order to start with the registration of your app, get the api key etc etc..

Here is a great source in github which shows how you can add push notification service in your android app
github.com/rana01645/android-push-notification
Firstly read the full documentation
How to add push notification in android application from android studio – Android developer (part – 1 Connect with firebase ) ~ http://androidrace.com/2016/12/08/how-to-add-push-notification-in-android-application-from-android-studio-android-developer-part-1-connect-with-firebase/
How to add push notification in android application from android studio – Android developer (part – 2 Working with server) ~http://androidrace.com/2017/01/05/how-to-add-push-notification-in-android-application-from-android-studio-android-developer-part-2-working-with-server/
Then you can able to send push notification from your server using html

public class Uyarilar extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent arg1) {
Date currentTime = Calendar.getInstance().getTime();
showNotification(context);
}
private void showNotification(Context context) {
PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
new Intent(context, MainActivity.class), 0);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.presta)
.setContentTitle("Saat 9:00")
.setContentText("Mesai saatiniz başlamıştır Lütfen harakete geçiniz!");
mBuilder.setContentIntent(contentIntent);
mBuilder.setDefaults(Notification.DEFAULT_SOUND);
mBuilder.setAutoCancel(true);
NotificationManager mNotificationManager =
(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(1, mBuilder.build());
}
}
and call
private void setNotification() {
Calendar calNow = Calendar.getInstance();
Calendar calSet = (Calendar) calNow.clone();
calSet.set(Calendar.HOUR_OF_DAY, 9);
calSet.set(Calendar.MINUTE, 00);
calSet.set(Calendar.SECOND, 0);
calSet.set(Calendar.MILLISECOND, 0);
if (calSet.compareTo(calNow) <= 0) {
calSet.add(Calendar.DATE, 1);
}
Date currentTime = Calendar.getInstance().getTime();
Intent intent = new Intent(getBaseContext(), Uyarilar.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), REQUEST_CODE, intent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, calSet.getTimeInMillis(), pendingIntent);
}
and
onCreate
setNotification();

this method to push notification
public void testMessage (String message , Intent intent){
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 , intent,
PendingIntent.FLAG_ONE_SHOT);
String channelId = "some_channel_id";
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
android.support.v4.app.NotificationCompat.Builder notificationBuilder =
new android.support.v4.app.NotificationCompat.Builder(this, channelId)
.setSmallIcon(R.mipmap.ic_launcher_round)
.setContentTitle(getString(R.string.app_name))
.setContentText(message)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setBadgeIconType(android.support.v4.app.NotificationCompat.BADGE_ICON_SMALL)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// Since android Oreo notification channel is needed.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(channelId,
"Channel human readable title",
NotificationManager.IMPORTANCE_DEFAULT);
assert notificationManager != null;
notificationManager.createNotificationChannel(channel);
}
assert notificationManager != null;
notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}