question: public static void scheduleLinear ( Context context , int delay ) { Intent intent = new Intent ( context , HeartbeatReceiver . class ) ; intent . putExtra ( KEY_DELAY , delay ) ; intent . putExtra ( KEY_TYPE , TYPE_LINEAR ) ; long timeGap = delay * 60 * 1000 ; PendingIntent alarmIntent = PendingIntent . getBroadcast ( context , delay , intent , PendingIntent . FLAG_CANCEL_CURRENT ) ; AlarmManager alarmManager = ( AlarmManager ) context . getSystemService ( Context . ALARM_SERVICE ) ; alarmManager . setRepeating ( AlarmManager . RTC_WAKEUP , System . currentTimeMillis ( ) + timeGap , timeGap , alarmIntent ) ; Log . d ( "Heartbeater" , "Scheduled repeating" ) ; }
target:  Starts a linear repeated alarm that sends a broadcast to Play Services, which in turn sends a heartbeat