I've been struggling with this for a couple of days. What I want to do is run a service periodically, about 2-3 minutes apart. I have an Activity that is responsible for the interface and setting up the first alarm.
The alarm is configured by a BroadcastReceiver which looks like this:
public class Receiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
String message = "Alarm worked";
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
setAlarm(context);
}
public void setAlarm(Context context){
AlarmManager am = (AlarmManager) context.
getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, Receiver.class);
PendingIntent pi = PendingIntent.getBroadcast(context,
0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
Intent dailyUpdater = new Intent(context, DiscoveryService.class);
context.startService(dailyUpdater);
am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
+ (1000 * 30) , pi);
}
}
I've tried using setRepeating for AlarmManager, but it still has the same effect. What happens is that the AlarmManager works how it should, it fires an Intent which the receiver gets and executes onReceive periodically, as it should. However, it executes the service only the first time. After the first time, the alarms still go off, but the service is not executed.
I read some threads from people with similar problems, and one of them mentioned that PendingIntent lasts for only one send. Thus, I opted out to setting the alarm every time so I can set pendingIntent flag for updating every time.
I tried making my service an intentService, which is fine, but then my bluetooth scanner inside the service does not work because intentService thread terminates without waiting for my bluetooth discovery to finish.
Anyone have any idea what can help me?
Here is part of my service:
public class DiscoveryService extends Service {
public void onCreate() {
super.onCreate();
Toast.makeText(this, "MyAlarmService.onCreate()",
Toast.LENGTH_LONG).show();
findEverything();
}
}
EDIT: This is the code that I currently have.
public void onReceive(Context context, Intent intent) {
String message = "Alarm worked";
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
Intent dailyUpdater = new Intent(context, DiscoveryService.class);
context.startService(dailyUpdater);
}
public void setAlarm(Context context){
// get a Calendar object with current time
AlarmManager am=(AlarmManager)context.
getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, Receiver.class);
PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
(1000 * 30) , pi);
}
What happens is that the AlarmManager works how it should, it fires an Intent which the reciever gets and executes onReceive periodically, as it should. However, it executes the service only the first time. After the first time, the alarms still go off, but the service is not executed.
You are calling startService() once when you are scheduling the alarm. You are not calling startService() at all from your BroadcastReceiver. Yet you are scheduling the alarm via the BroadcastReceiver. Hence, when the alarm goes off, the service will not be sent a command, because you are not sending it a command.
I read some threads from people with similar problems, and one of them mentioned that PendingIntent lasts for only one send.
That is only if you use FLAG_ONE_SHOT.
Anyone have any idea what can help me?
Call startService() from your onReceive() method, instead of from your setAlarm() method. Also, add in all the WakeLock management logic, since you are using a _WAKEUP alarm and you are not able to use my WakefulIntentService.
Related
I have some existing code that spawns a service intent which does a bunch of stuff in the background. This code does work...
Intent serviceIntent = new Intent(context, APMService.class);
serviceIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startService(serviceIntent);
My question is: how to change this to use the AlarmManager.setInexactRepeating(...) methods?
I have changed the above code to this:
Intent serviceIntent = new Intent(context, APMService.class);
serviceIntent.putExtra("STARTED_BY", starter);
serviceIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//Set up recurring alarm that restarts our service if
// it crashes or if it gets killed by the Android OS
AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
PendingIntent pi = PendingIntent.getService(context, 0, serviceIntent, 0);
//am.cancel(pi);
am.setInexactRepeating(
AlarmManager.ELAPSED_REALTIME_WAKEUP //wake up the phone if it's asleep
, cal.getTimeInMillis()
, 10000
, pi);
And I have added these permissions to AndroidManifest.xml...
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<uses-permission android:name="com.android.alarm.permission.WAKE_LOCK"/>
My understanding is that this is supposed to start the service immediately and then try to restart it again every 10 seconds. But this code isn't working properly.
Using this new code, the service never starts at all and I cannot see why not. To complicate matters the debugger never seems to attach to the app in time to see what's going on.
Can anyone see what I'm doing wrong?
Put AlarmManager code under onDestroy() function of service to schedule start of service as below:
#Override
public void onDestroy() {
/**
* Flag to restart service if killed.
* This flag specify the time which is ued by
* alarm manager to fire action.
*/
final int TIME_TO_INVOKE = 5 * 1000; // try to re-start service in 5 seconds.
// get alarm manager
AlarmManager alarms = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, AutoStartServiceReceiver.class);
PendingIntent pendingIntent = PendingIntent
.getBroadcast(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
// set repeating alarm.
alarms.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() +
TIME_TO_INVOKE, TIME_TO_INVOKE, pendingIntent);
}
And handle starting of your service in AutoStartServiceReceiver as below:
public class AutoStartServiceReceiver extends BroadcastReceiver {
private static final String TAG = AutoStartServiceReceiver.class.getSimpleName();
#Override
public void onReceive(Context context, Intent intent) {
// check broadcast action whether action was
// boot completed or it was alarm action.
if (intent.getAction().equals(AppConstants.ACTION_ALARM_INTENT)) {
context.startActivity(new Intent(context, YourActivity.class));
// handle service restart event
LockerServiceHelper.handleServiceRestart(context);
}
}
}
Kindly note that, your service will not restart if you stop it manually from settings-apps-running apps-your app.
Your service is not starting because of AlarmManager.ELAPSED_REALTIME_WAKEUP, while it should be using AlarmManager.RTC_WAKEUP
If you want to run every 10s keep in mind that above API 21 alarm intervals below 60s are rounded up to 60s.
Also, consider using WakefulIntentService
https://github.com/commonsguy/cwac-wakeful
I've seen several examples on how to make some event to be repeated even when the app isnt running, but still I'm not sure if I got it.
With AlarmManager you can make your app to wake up to do something in some fixed interval without it consuming system resources between the periods, right?
But can it be to show up a toast over your current activity instead of having an Activity with a layout for it?
AlarmReceiver class:
public class AlarmReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
// this is where to start activity or service to launch toast message
}
}
In activity or boot receiver:
private static final int PERIOD = 60000; //or whatever you need for repeating alarm
AlarmManager mgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent alIntent = new Intent(context, AlarmReceiver.class);
PendingIntent pi = PendingIntent.getBroadcast(context, 0, alIntent, 0);
mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + 60000, PERIOD, pi);
In AndroidManifest, add:
<receiver android:name=".AlarmReceiver"></receiver>
I have an AlarmManager that sets a repeating alarm for the purpose of periodically querying a server.
private AlarmManager alarmManager;
private PendingIntent pendingIntent;
alarmManager = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
Intent photosIntent = new Intent(this,AlarmReceiver.class);
//startService(photosIntent);
pendingIntent = PendingIntent.getBroadcast(getApplicationContext(),0,photosIntent,0);
alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME,
SystemClock.elapsedRealtime(),
10000, pendingIntent);
And I start an IntentService within the AlarmReceiver's onReceive() method. AlarmReceiver is a BroadcastReceiver. Here is the onReceive() method:
#Override
public void onReceive(Context context, Intent intent) {
Intent photosIntent = new Intent(context,JSONPhotosParser.class);
context.startService(photosIntent);
}
Now, this is something crazy I want to do, as it is not very practical. Is there any way I can stop my AlarmManager from within the BroadcastReceiver. I can also think of a practical scenario where such an action would be required. Say I am querying the status of a network connection using ConnectivityManager and if a connection exists I would start an IntentService that queries a server (which is my current scenario). If network status returns false, I would like to stop the repeating alarm set by the AlarmManager.
Is this possible within the BroadcastReceiver ? I understand that an AlarmManager can be removed using cancel(PendingIntent operation). But how do I create PendingIntent inside the BroadcastReceiver ?
Any help on this would be most appreciated. From an Android noob.
refer this link :
AlarmManager.cancel (PendingIntent operation)
http://developer.android.com/reference/android/app/AlarmManager.html#cancel%28android.app.PendingIntent%29
I am using Android AlarmManger to schedule an IntentService to run after small intervals.
Here is my AlarmManger:
static void setNextSchedule(Context ctx, long interval){
AlarmManager manager = (AlarmManager) ctx.getSystemService(Context.ALARM_SERVICE);
Intent nIntent = new Intent(ctx, DService.class);
PendingIntent pIntent = PendingIntent.getActivity(ctx, 1, nIntent, PendingIntent.FLAG_UPDATE_CURRENT);
manager.setRepeating(AlarmManager.ELAPSED_REALTIME,
SystemClock.elapsedRealtime() + interval, interval, pIntent);
Log.i(ScheduleAlarm.class.getSimpleName(), "Next alarm set");
}
And my IntentService:
#Override
protected void onHandleIntent(Intent intent) {
Log.i(DService.class.getSimpleName(), "Service starting");
ScheduleAlarm.setNextSchedule(getApplicationContext(), 15000);
}
Currently it just holds code for testing. Now this code will run successfully with no problems once the app starts but after 15 seconds it will state that the service is starting in the logcat but the code won't execute.
How to get the intenet service the execute the code inside the onHandleIntent each time it runs?
Thanks
When using a PendingIntent, the factory method needs to match the type of component that your Intent is for:
If your Intent points to an activity, use getActivity()
If your Intent points to a service, use getService()
If your Intent points to a BroadcastReceiver, use getBroadcast()
If your Intent points to none of the above, go directly to jail, do not pass Go!, do not collect $200 :-)
I have an update service that starts at boot. The thing is I want it to make a check and then wait for a period of time and restart itself. I did this with alarm clock when my service was tied to an application but now it is independent and I only use a broadcast receiver to start it at boot. The problem is that now for some reason I can't integrate my alarm clock with it.
I only have my UpdateService class and my broadcastreceiver class.My code so far in the broadcastreceiver is this, but I want to put the alarm clock here to say schedule the service to start every 30 seconds. I really need this.
#Override
public void onReceive(Context context, Intent intent) {
Intent startServiceIntent = new Intent(context, UpdateService.class);
context.startService(startServiceIntent);
}
Any suggestions are welcome. Thanks in advance.
I found the answer to my problem:
private boolean service_started=false;
private PendingIntent mAlarmSender;
#Override
public void onReceive(Context context, Intent intent) {
if(!service_started){
// Create an IntentSender that will launch our service, to be scheduled
// with the alarm manager.
mAlarmSender = PendingIntent.getService(context,
0, new Intent(context, UpdateService.class), 0);
//We want the alarm to go off 30 secs from now.
long firstTime = SystemClock.elapsedRealtime();
// Schedule the alarm!
AlarmManager am = (AlarmManager)context.getSystemService(context.ALARM_SERVICE);
am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
firstTime,30*1000, mAlarmSender);
service_started=true;
}
}
Eventually,my problem was that I didn't get the context right as follows:
(AlarmManager)getSystemService(ALARM_SERVICE);
changed to
(AlarmManager)context.getSystemService(context.ALARM_SERVICE);