How to Use AlarmManager in android Development

How to Use AlarmManager in android Development

How to Use AlarmManager in android Development

During android development. AlarmManager is often used to regularly send a broadcast, start a Service, or start an Activity. This article will introduce three methods of AlarmManager during development.

1. Use alarm to send a broadcast

First, we need to create an Intent instance. Used to send broadcasts. The Code is as follows:

You can define the action to be sent. The following code sends a CLOCK broadcast every five seconds.

Define a receiver in Manifest to receive CLOCK broadcasts.

Intent intent = new Intent (); intent. setAction ("CLOCK ");
Intent. putExtra ("msg", "alarm start ");
PendingIntent pendingIntent = PendingIntent. getBroadcast (this, 0, intent, 0 );
AlarmManager am = (AlarmManager) getSystemService (ALARM_SERVICE );
Log. I (TAG, "Alarm"); am. setRepeating (AlarmManager. RTC_WAKEUP,
System. currentTimeMillis (), 5*1000, pendingIntent );

2. Use alarm to start an Activity. The Code is as follows:

Intent intent = new Intent ();
Intent. setClass (MainActivity. this, AlarmActivity. class );

PendingIntent pendingIntent = PendingIntent. getActivity (this, 0, intent, 0 );

AlarmManager am = (AlarmManager) getSystemService (ALARM_SERVICE );

Am. set (AlarmManager. RTC_WAKEUP, System. currentTimeMillis () + 5*1000, pendingIntent );

3. Use alarm to start a Service. The Code is as follows:

The Service must be declared in Manifest.

Intent intent = new Intent ();
Intent. setClass (MainActivity. this, AlarmService. class );


PendingIntent pendingIntent = PendingIntent. getService (this, 0, intent, 0 );

AlarmManager am = (AlarmManager) getSystemService (ALARM_SERVICE );
Log. I (TAG, "Alarm ");
Am. set (AlarmManager. RTC_WAKEUP, System. currentTimeMillis () + 5*1000, pendingIntent );

To cancel a timer, follow these steps:

Intent I = new Intent ();
I. setAction ("CLOCK ");
I. putExtra ("msg", "alarm start ");

// Parameter 2 is id. Cancel Alarm with id 0
PendingIntent pendingIntent = PendingIntent. getBroadcast (this, 0,
I, 0 );
AlarmManager am = (AlarmManager) getSystemService (ALARM_SERVICE );

Am. cancel (pendingIntent );

Am. setRepeating () // indicates periodic startup

Am. set () // indicates to start only once