android - How to set an alarm inside a broadcastreceiver -


in app there's option user make event repeat, , each recurrence of repeating event have notification (an alarm) remind user event start.

so when first alarm gets called, opens broadcastreceiver, creates notification , should set alarm next recurrence: 

    @override public void onreceive(context context, intent intent) {     // when onreceive gets called event notification triggered     databasehelper mydatabasehelper = new databasehelper(context);          // create notification         int id = intent.getintextra("id", 0);         string name = intent.getstringextra("name");         long notificationtime = intent.getlongextra("notificationtime", 0);         string recurrencetype = intent.getstringextra("recurrencetype");         string message = intent.getstringextra("message");          if (recurrencetype.equals("every week")) {             // repeatinterval = unix timestamp * 1000 in millis notificationtime             long repeatinterval = 604800 * 1000;             notificationtime += repeatinterval;             mydatabasehelper.updatenotificationtime(notificationtime);             setalarm(context, intent, id, name, notificationtime, recurrencetype, message);         } else {             mydatabasehelper.updatenotificationtime(0);         }          createnotification(context, message, name, id);     } }

now works fine first alarm of event. notification created. when second alarm gets called intent empty, after first alarm other intents empty , empty notification created app crashes nullpointerexception. note: i'm keeping app open , device. setalarm(...) method inside broadcastreceiver class.

how set alarms:

    public void setalarm(context context, intent intent, int id, string name, long notificationtime, string recurrencetype, string message){     alarmmanager alarmmanager = (alarmmanager) context.getsystemservice(context.alarm_service);     intent intentalarm = new intent(context, alarmreceiver.class);     intent.putextra("id", id);     intent.putextra("name", name);     intent.putextra("notificationtime", notificationtime);     intent.putextra("recurrencetype", recurrencetype);     intent.putextra("message", message);     // pendingintent specifies action take in future [context, request code, intent, flag]     pendingintent pendingintent = pendingintent.getbroadcast(context, id, intentalarm, pendingintent.flag_update_current);     // rtc_wakeup wake device when goes off     alarmmanager.set(alarmmanager.rtc_wakeup, notificationtime, pendingintent); }

stacktrace:

08-25 12:12:35.917 19323-19323/com.madgusto.when2game e/androidruntime: fatal exception: main                                                                     process: com.madgusto.when2game, pid: 19323                                                                     java.lang.runtimeexception: unable start receiver com.madgusto.when2game.alarm.alarmreceiver: java.lang.nullpointerexception: attempt invoke virtual method 'boolean java.lang.string.equals(java.lang.object)' on null object reference                                                                         @ android.app.activitythread.handlereceiver(activitythread.java:3018)                                                                         @ android.app.activitythread.-wrap18(activitythread.java)                                                                         @ android.app.activitythread$h.handlemessage(activitythread.java:1544)                                                                         @ android.os.handler.dispatchmessage(handler.java:102)                                                                         @ android.os.looper.loop(looper.java:154)                                                                         @ android.app.activitythread.main(activitythread.java:6077)                                                                         @ java.lang.reflect.method.invoke(native method)                                                                         @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:866)                                                                         @ com.android.internal.os.zygoteinit.main(zygoteinit.java:756)                                                                      caused by: java.lang.nullpointerexception: attempt invoke virtual method 'boolean java.lang.string.equals(java.lang.object)' on null object reference                                                                         @ com.madgusto.when2game.alarm.alarmreceiver.onreceive(alarmreceiver.java:48)                                                                         @ android.app.activitythread.handlereceiver(activitythread.java:3011)                                                                         @ android.app.activitythread.-wrap18(activitythread.java)                                                                          @ android.app.activitythread$h.handlemessage(activitythread.java:1544)                                                                          @ android.os.handler.dispatchmessage(handler.java:102)                                                                          @ android.os.looper.loop(looper.java:154)                                                                          @ android.app.activitythread.main(activitythread.java:6077)                                                                          @ java.lang.reflect.method.invoke(native method)                                                                          @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:866)                                                                          @ com.android.internal.os.zygoteinit.main(zygoteinit.java:756) 

so null pointer @ :

if (recurrencetype.equals("every week")) {

now how go on set alarm inside broadcastreceiver correct way? thanks!

it pretty clear happening. @ code:

intent intentalarm = new intent(context, alarmreceiver.class); intent.putextra("id", id); intent.putextra("name", name); intent.putextra("notificationtime", notificationtime); intent.putextra("recurrencetype", recurrencetype); intent.putextra("message", message); pendingintent pendingintent = pendingintent.getbroadcast(context, id, intentalarm, pendingintent.flag_update_current);

you create intent in variable intentalarm, put "extras" intent using variable intent. pass intentalarm argument pendingintent.getbroadcast(). of course intentalarm doesn't have "extras" in it.

try putting "extras" in intentalarm instead.


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