android alarm manager run background service every 15 minute

Question

hey there i am trying to run android background service every 15 minutes using alarm manager but i am unable to do so i don't what mistake and i can't figure out whats wrong in my code its not working

try {
        //Create a new PendingIntent and add it to the AlarmManager
        Intent intent = new Intent(this, RingAlarm.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this,
            12345, intent, PendingIntent.FLAG_CANCEL_CURRENT);
        AlarmManager am =
            (AlarmManager)getSystemService(Activity.ALARM_SERVICE);
        am.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(),
                3000,pendingIntent);
        
      } catch (Exception e) {
          Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
          
      }

RingAlaram.class

public class RingAlarm extends Service { 
      public void onCreate() {  
                  Toast.makeText(getApplicationContext(), "hi there", Toast.LENGTH_LONG).show();
                }

        @Override
        public IBinder onBind(Intent arg0) {
            // TODO Auto-generated method stub
            return null;
        }
}

and last my manifest

   <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.alarmmanagerexample.AlarmManagerExample"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
          <service 
            android:name=".RingAlarm"
            android:exported="false" />
    </application>

Answer 1

Change getActivity to getService

Intent intent = new Intent(this, RingAlarm.class);
        PendingIntent pendingIntent = PendingIntent.getService(this,
            12345, intent, PendingIntent.FLAG_CANCEL_CURRENT);
        AlarmManager am =
            (AlarmManager)getSystemService(Activity.ALARM_SERVICE);
        am.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(),
                3000,pendingIntent);

      } catch (Exception e) {
          Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();

      }