iOS Question [B4XPages] B4i Alarm

[RauchG]

Hello everyone,

I'm working on a CountDown app. With a CountDown, the date and time are counted down using a "timer1_tick". If the date and time are less than / equal to <= than now, an alarm is to be triggered. The app is in the background and should be woken up or a notification should pop up.

Here is an example that "LocalNotifications" works. It works if you click on the "btnNotification" button. The app can be in the background and the notification pops up.

Scheduling local notifications

There are two ways for your app to notify the user while the app is in the background: push notifications and local (or scheduled) notifications. This tutorial explains how to create local notifications. Local notifications are simple to use but are also quite limited. While your app is running...

www.b4x.com

Is it possible to trigger the event not by clicking on the button, but by a "timer1_tick" event?

In my app, a toast "hd.ToastMessageShow (lblcdName.Text &" has expired ", False)" works via the "timer1_tick".


Greetings RauchG

 

[Erel]

Why not calculate the expected time and schedule the notification to show at that time?

You can show a notification from a timer, while the app is in the background, assuming that the OS didn't kill the process. It will kill it after a minute or two.

 

[RauchG]

Why not calculate the expected time and schedule the notification to show at that time?

I have now taken a different route. In the CustomListView I show an alarm button. This activates

ln.Initialize (DateTime.Now + (mLongFromNow) * DateTime.TicksPerSecond)

mLongFromNow = the calculated seconds

The notification works. But only with a countdown. If I want to call two CountDowns, only the last one becomes active. It is also clear because the last calculated time is transferred. The first ContDown is ignored.

I am now trying to write the different calculated seconds in a table and to transfer the smallest value, when the notification became active, delete and transfer the next value.

Could that work?

 

[Erel]

Multiple notifications should work. You are doing something wrong. Note that by default the notifications will only appear when the app is in the background.

 

[RauchG]

Multiple notifications should work. You are doing something wrong. Note that by default the notifications will only appear when the app is in the background.

I'll try a table. Or is there a better way to save the seconds for multiple notification?

 

[Erel]

Not sure that I understand.

 

[RauchG]

Not sure that I understand.

For multiple notification I get several values (seconds) for mLongFromNow.

ln.Initialize (DateTime.Now + (mLongFromNow) * DateTime.TicksPerSecond)

I have to save these values somewhere. I'm thinking of a table or is there a better way to save the values (seconds)?

 

[Erel]

Check KeyValueStore. You can save anything you like, very easily.

 

[RauchG]

Check KeyValueStore. You can save anything you like, very easily.

OK ... then I'll look in the forum

thanks