java - Android: Notifications are not showing in Notification bar -

i trying display notification in notification bar when alarm triggered. below code.

alarmreciever.java

import android.app.notification; import android.app.notificationmanager; import android.app.pendingintent; import android.content.broadcastreceiver; import android.content.context; import android.content.intent; import android.telephony.smsmanager; import android.util.log; import android.widget.toast;  /**  * created yohan on 6/29/2016.  */ public class alarmreciever extends broadcastreceiver {     @override     public void onreceive(context context, intent intent)     {         // todo auto-generated method stub           // here can start activity or service depending on need         // ex can start activity vibrate phone or ring phone         string message="hi there later, see soon";// message send            // show toast  in above screen shot         log.d("alarm",message);         toast.maketext(context, "alarm triggered , sms sent", toast.length_long).show();          intent intent2 = new intent(context, notificationreceiveractivity.class);         pendingintent pintent = pendingintent.getactivity(context, (int) system.currenttimemillis(), intent2, 0);          notification noti = new notification.builder(context)                 .setcontenttitle("new mail " + "test@gmail.com")                 .setcontentintent(pintent).getnotification();         notificationmanager notificationmanager = (notificationmanager) context.getsystemservice(context.notification_service);         // hide notification after selected         noti.flags |= notification.flag_auto_cancel;          notificationmanager.notify(0, noti);     }  } 

here have used getnotification() instead of build() because minimum api 15.

notificationreceiveractivity.java

import android.os.bundle; import android.support.design.widget.floatingactionbutton; import android.support.design.widget.snackbar; import android.support.v7.app.appcompatactivity; import android.support.v7.widget.toolbar; import android.view.view;  public class notificationreceiveractivity extends appcompatactivity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_notification_receiver);         toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);         setsupportactionbar(toolbar);          floatingactionbutton fab = (floatingactionbutton) findviewbyid(r.id.fab);         fab.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view view) {                 snackbar.make(view, "replace own action", snackbar.length_long)                         .setaction("action", null).show();             }         });     }  } 

manifest

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="voice1.xxx.com.alarmcheck2" >      <uses-permission android:name="com.android.alarm.permission.set_alarm" />     <uses-permission android:name="android.permission.receive_boot_completed" />      <application         android:allowbackup="true"         android:icon="@mipmap/ic_launcher"         android:label="@string/app_name"         android:supportsrtl="true"         android:theme="@style/apptheme" >         <activity             android:name=".mainactivity"             android:label="@string/app_name"             android:theme="@style/apptheme.noactionbar" >             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>          <receiver android:name=".bootcompletedreceiver" >             <intent-filter>                 <action android:name="android.intent.action.boot_completed" />             </intent-filter>         </receiver>         <receiver             android:name=".alarmreciever"             android:process=":remote" />          <activity             android:name=".notificationreceiveractivity"             android:label="@string/title_activity_notification_receiver"             android:theme="@style/apptheme.noactionbar" >         </activity>     </application>  </manifest> 

in alarmreciever.java toast getting fired know working. notification not. idea why is?

as documentation said, must put small icon :

required notification contents notification object must contain following:

a small icon, set setsmallicon() title, set setcontenttitle() detail text, set setcontenttext()

see here more details : https://developer.android.com/guide/topics/ui/notifiers/notifications.html