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POWhat is the proper way for implementing an alarm that runs once, but stays alive after reboot?
 

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  1. POWhat is the proper way for implementing an alarm that runs once, but stays alive after reboot?
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    <p>In my app, I have an alarm set that when run, launches a service that will perform a task (in my app, it is sending a text message without user interaction). This message can be set for 2 hours in the future, or a year in the future. Here is how I implement it.</p> <p><strong>In my main activity</strong></p> <p>user types message, choses a date and time (translated to milliseconds), and that alarm time (the milliseconds), is saved persistently. I then call a service, which i have set to be sticky, and boot on startup. </p> <p><strong>In my service.</strong></p> <p>When the service gets called (Which after the first time you schedule a message, it is now running, all the time), it creates the alarm with the saved alarm time. This is good, because if the phone reboots, the alarm will get recreated again.</p> <p><strong>Here is the problem</strong></p> <p>After the alarm time has passed, and the message is successfully sent, I don't see a way to shut down that service from always running. So as soon as the service gets killed and restarted (like when the phone reboots), it launches, sees the alarm time is in the past, and immediately launches the service that sends the message. So until I clear data on the app, I get random duplicate messages sent out, at random future times.</p> <p><strong>My solution (not elegant).</strong></p> <p>After the message sends the first time, i add 50 years (in milliseconds), to the alarm time, and resave it persistently. This way it won't trigger again until the user actually sets the time themselves. This seems to have worked, but IMO is a terrible solution. </p> <p><strong>There has to be a more proper way of setting a persistent alarm to only run once. Can someone who has more experience with AlarmManager advise me?</strong></p>
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    1. USBriCo84
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      1. POWhat is the proper way for implementing an alarm that runs once, but stays alive after reboot?
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    1. COAre you using AlarmManager? Are you clearing your alarm time from your persistent storage after the alarm fires?
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      1. USKarakuri
    2. COWhy can't you cancel the alarm after the message has been sent?
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    3. COYes I am using AlarmManager. It doesn't matter if i clear the alarm time, because if it is zero, the alarm when it gets set again (on boot, and then checks the alarm time for what milliseconds to set it to) will fire right away, as of now, i am adding 50 years in milliseconds to that time, so that it won't fire. I can't cancel the alarm, because it does no good. Remember, in order to set the alarm to not get killed on a reboot, i have to have it launch from a service that starts on boot. so it will always run that code on boot, to create the alarm
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