I have been working on setting alarms using AlarmManager.
Set:
Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
getApplicationContext(), reqCode, myIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC, now.getTimeInMillis(), pendingIntent);
cancel:
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
getApplicationContext(), reqCode, myIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager.cancel(pendingIntent);
in my alarm receiver I want to be able to receive a notification which has a button that allows me to call cancelAlarm(). however I don't see the best approach to this and looking for the best and most reliable way of doing this.
I get the requestCodes so I am able tell which alarm to cancel
I'm working on an app which will allow users to set multiple notifications, and cancel any notification they choose.
The problem I have is that when I cancel a pending intent using the AlarmManager it is cancelling all alarms. Each of my pending intents has it's own unique request code.
For instance I would call this to create the alarm and then delete:
setAlarm(5062, 1453269670) // Set alarm 1
setAlarm(5063, 1453774418) // Set alarm 2
cancelAlarm(5062) // Cancel alarm 1
cancelAlarm(5063) // Cancel alarm 2
Setting mutiple alarms always works, I can set as many as I like and they all produce the notification. However if I was to cancel alarm 1, it also cancels alarm 2.
I know that the pending intent has to be the same when setting and cancelling, and each pending intent has it's own unique request code, so I don't know why it's not working. I've spent many hours googling, but none of the suggested answers have helped me.
void setAlarm(int request_code, long alarm_time) {
Intent intent = new Intent(context, NotificationReceiver.class);
intent.putExtra("request_code", request_code);
PendingIntent pendingIntent = PendingIntent.getService(context, request_code, intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager.setExact(AlarmManager.RTC_WAKEUP, alarm_time, pendingIntent);
}
void cancelAlarm(int request_code) {
Intent intent = new Intent(context, NotificationReceiver.class);
intent.putExtra("request_code", request_code);
PendingIntent pendingIntent = PendingIntent.getService(context, request_code, intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
pendingIntent.cancel();
alarmManager.cancel(pendingIntent);
}
The answer is simple
Intent firstIntent = new Intent(this, Receiver.class);
intent.setAction("action 1");
intent.putExtra("extra", "extra1");
firstPendingIntent = PendingIntent.getBroadcast(this, 0, firstIntent, 0);
Intent secondIntent = new Intent(this, Receiver.class);
intent.setAction("action 2");
intent.putExtra("extra", "extra2");
secondPendingIntent = PendingIntent.getBroadcast(this, 0, secondIntent, 0);
if you compare two PendingIntents created in ABOVE code they are NOT EQUAL
But in code BELOW:
Intent firstIntent = new Intent(this, Receiver.class);
intent.setAction("action 1");
intent.putExtra("extra", "extra1");
firstPendingIntent = PendingIntent.getBroadcast(this, 0, firstIntent, 0);
Intent secondIntent = new Intent(this, Receiver.class);
intent.setAction("action 1");
intent.putExtra("extra", "extra2");
secondPendingIntent = PendingIntent.getBroadcast(this, 0, secondIntent, 0);
if you compare two PendingIntents they gonna be EQUAL, so doesn't matter what you pass in putExtra method
I have implemented a reminder system into my application which uses the AlarmManager provided by android. I have initialized notifications to trigger, once the alarm sets off (when the app is open or closed) but i cannot seem to switch the alarm off in either state.
I cannot seem to find my answer anywhere. Is this possible?
AlarmManager alarmManager = (AlarmManager)
getSystemService(Context.ALARM_SERVICE);
Intent myIntent = new Intent(getApplicationContext(), YourService.class);
PendingIntent pendingIntent =
PendingIntent.getBroadcast(getApplicationContext(), 1, myIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager.cancel(pendingIntent);
I am using AlarmManager to create an alarm that is supposed to be repeated every x seconds. The alarm indeed fires onces, then again after the desired period of time but then never again.
Here is my code
MyActivity.java
// Retrieve a PendingIntent that will perform a broadcast
Intent alarmIntent = new Intent(this, MyReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 1, alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
int interval = 3000; // 3 sec
manager.setRepeating(
AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime(),
interval,
pendingIntent);
MyReceiver.java
public class MyReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context.getApplicationContext(), "I'm running", Toast.LENGTH_SHORT).show();
}
}
When I run my application I see a Toast saying "I'm running" and then 5 (not 3 for some reason) seconds later another toast. After that I see nothing else.
How can I make my alarm to keep repeating until I stop it?
I need to trigger a block of code after 20 minutes from the AlarmManager being set.
Can someone show me sample code on how to use an AlarmManager in ِAndroid?
I have been playing around with some code for a few days and it just won't work.
"Some sample code" is not that easy when it comes to AlarmManager.
Here is a snippet showing the setup of AlarmManager:
AlarmManager mgr=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent i=new Intent(context, OnAlarmReceiver.class);
PendingIntent pi=PendingIntent.getBroadcast(context, 0, i, 0);
mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), PERIOD, pi);
In this example, I am using setRepeating(). If you want a one-shot alarm, you would just use set(). Be sure to give the time for the alarm to start in the same time base as you use in the initial parameter to set(). In my example above, I am using AlarmManager.ELAPSED_REALTIME_WAKEUP, so my time base is SystemClock.elapsedRealtime().
Here is a larger sample project showing this technique.
There are some good examples in the android sample code
.\android-sdk\samples\android-10\ApiDemos\src\com\example\android\apis\app
The ones to check out are:
AlarmController.java
OneShotAlarm.java
First of, you need a receiver, something that can listen to your alarm when it is triggered. Add the following to your AndroidManifest.xml file
<receiver android:name=".MyAlarmReceiver" />
Then, create the following class
public class MyAlarmReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "Alarm went off", Toast.LENGTH_SHORT).show();
}
}
Then, to trigger an alarm, use the following (for instance in your main activity):
AlarmManager alarmMgr = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, MyAlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
Calendar time = Calendar.getInstance();
time.setTimeInMillis(System.currentTimeMillis());
time.add(Calendar.SECOND, 30);
alarmMgr.set(AlarmManager.RTC_WAKEUP, time.getTimeInMillis(), pendingIntent);
.
Or, better yet, make a class that handles it all and use it like this
Bundle bundle = new Bundle();
// add extras here..
MyAlarm alarm = new MyAlarm(this, bundle, 30);
this way, you have it all in one place (don't forget to edit the AndroidManifest.xml)
public class MyAlarm extends BroadcastReceiver {
private final String REMINDER_BUNDLE = "MyReminderBundle";
// this constructor is called by the alarm manager.
public MyAlarm(){ }
// you can use this constructor to create the alarm.
// Just pass in the main activity as the context,
// any extras you'd like to get later when triggered
// and the timeout
public MyAlarm(Context context, Bundle extras, int timeoutInSeconds){
AlarmManager alarmMgr =
(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, MyAlarm.class);
intent.putExtra(REMINDER_BUNDLE, extras);
PendingIntent pendingIntent =
PendingIntent.getBroadcast(context, 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
Calendar time = Calendar.getInstance();
time.setTimeInMillis(System.currentTimeMillis());
time.add(Calendar.SECOND, timeoutInSeconds);
alarmMgr.set(AlarmManager.RTC_WAKEUP, time.getTimeInMillis(),
pendingIntent);
}
#Override
public void onReceive(Context context, Intent intent) {
// here you can get the extras you passed in when creating the alarm
//intent.getBundleExtra(REMINDER_BUNDLE));
Toast.makeText(context, "Alarm went off", Toast.LENGTH_SHORT).show();
}
}
What you need to do is first create the intent you need to schedule. Then obtain the pendingIntent of that intent. You can schedule activities, services and broadcasts. To schedule an activity e.g MyActivity:
Intent i = new Intent(getApplicationContext(), MyActivity.class);
PendingIntent pi = PendingIntent.getActivity(getApplicationContext(),3333,i,
PendingIntent.FLAG_CANCEL_CURRENT);
Give this pendingIntent to alarmManager:
//getting current time and add 5 seconds in it
Calendar cal = Calendar.getInstance();
cal.add(Calendar.SECOND, 5);
//registering our pending intent with alarmmanager
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP,cal.getTimeInMillis(), pi);
Now MyActivity will be launched after 5 seconds of the application launch, no matter you stop your application or device went in sleep state (due to RTC_WAKEUP option).
You can read complete example code Scheduling activities, services and broadcasts #Android
I wanted to comment but <50 rep, so here goes. Friendly reminder that if you're running on 5.1 or above and you use an interval of less than a minute, this happens:
Suspiciously short interval 5000 millis; expanding to 60 seconds
See here.
Some sample code when you want to call a service from the Alarmmanager:
PendingIntent pi;
AlarmManager mgr;
mgr = (AlarmManager)ctx.getSystemService(Context.ALARM_SERVICE);
Intent i = new Intent(DataCollectionActivity.this, HUJIDataCollectionService.class);
pi = PendingIntent.getService(DataCollectionActivity.this, 0, i, 0);
mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() , 1000, pi);
You dont have to ask userpermissions.
An AlarmManager is used to trigger some code at a specific time.
To start an Alarm Manager you need to first get the instance from the System. Then pass the PendingIntent which would get executed at a future time that you specify
AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent alarmIntent = new Intent(context, MyAlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, alarmIntent, 0);
int interval = 8000; //repeat interval
manager.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);
You need to be careful while using the Alarm Manager.
Normally, an alarm manager cannot repeat before a minute. Also in low power mode, the duration can increase to up to 15 minutes.