android notification only sound plays notification is not shown in notification drawer -

i trying fire notification in @ particular time using alarmmanager , notification manager. facing strange problem. when notification fired sound plays notification not shown in notification drawer. got error in log

04-26 11:32:09.217    1222-1222/? e/notificationservice﹕ warning: in future release crash app: com.example.shiv.selftweak 

my code .

the class calls alarmmanager

        intent intent1 = new intent(this, firenotification.class);         pendingintent pendingintent = pendingintent.getservice(this, 1000, intent1, 0);         alarmmanager = (alarmmanager)this.getsystemservice(alarm_service);         am.set(alarmmanager.rtc_wakeup,system.currenttimemillis(),  pendingintent); 

firenotification class

public class firenotification extends service {      @override     public void oncreate() {         intent intent = new intent(this, mainactivity.class);         long[] pattern = {0, 300, 0};         pendingintent pi = pendingintent.getactivity(this, 1234, intent, 0);         notificationcompat.builder mbuilder = new notificationcompat.builder(this)                 .setcontenttitle("self tweak")                 .setcontenttext("habbits waiting last dones")                 .setvibrate(pattern)                 .setautocancel(false);          mbuilder.setcontentintent(pi);         mbuilder.setdefaults(notification.default_sound);         mbuilder.setautocancel(false);         notificationmanager mnotificationmanager = (notificationmanager) this.getsystemservice(notification_service);         mnotificationmanager.notify(1234, mbuilder.build());     }  @override public ibinder onbind(intent intent) {     return null; } 

}

android menifest

 <service android:name=".firenotification"></service>         <intent-filter>              <action android:name="android.intent.action.main" />              <category android:name="android.intent.category.launcher"/>         </intent-filter> 

when notification fires sound plays. not getting shown in notification drawer shows no notification.

the problem haven't specified mbuilder.setsmallicon(r.drawable.ic_launcher).

basically have set smallicon, contenttitle , contenttext. if miss of notification not displayed @ all! that's specified here (also can read more notifications there well).