\u00a0<\/b>methods i.e\u00a0startRepeatingTimer,\u00a0cancelRepeatingTimer and\u00a0onetimeTimer respecitively. These methods will be defined in the Activity class. The layout file is shown below(activity_alarm_manager.xml).<\/p>\n\n \n\n \n \n \n \n<\/pre>\nWe are going to define the BroadcastReciever which handles the intent registered with AlarmManager. In the given class onReceive() method has been defined. This method gets invoked as soon as intent is received. Once we receive the intent we try to get the extra parameter associated with this intent. This extra parameter is user-defined i.e ONE_TIME, basically indicates whether this intent was associated with one-time timer or the repeating one. Once the ONE_TIME parameter value has been extracted, Toast message is \u00a0displayed\u00a0accordingly. Helper methods have also been defined, which can be used from other places with the help of objects i.e\u00a0setAlarm(), cancelAlarm() and onetimeTimer()<\/b> methods. These methods can also be defined\u00a0somewhere\u00a0else to \u00a0do operation on the timer i.e set, cancel, etc. To keep this tutorial simple, we have defined it in BroadcastReceiver.<\/p>\n
\nsetAlarm():<\/b>\u00a0This method sets the repeating alarm by use of setRepeating() method. setRepeating() method needs four arguments:<\/p>\n\n- type of alarm,\u00a0<\/li>\n
- trigger time: set it to the current time<\/li>\n
- interval in milliseconds: in this example we are passing 5 seconds ( 1000 * 5 milliseconds)<\/li>\n
- pending intent: It will get registered with this alarm. When the alarm gets triggered the pendingIntent will be broadcasted.<\/li>\n<\/ol>\n
cancelAlarm()<\/b>: This method cancels the previously registered alarm by calling cancel() method. cancel() method takes pendingIntent as an argument. The pendingIntent should be matching one, only then the cancel() method can remove the alarm from the system.<\/p>\n
onetimeTimer():<\/b> This method creates an one-time alarm. This can be achieved by calling set() method. set() method takes three arguments:<\/p>\n\n- type of alarm<\/li>\n
- trigger time\u00a0<\/li>\n
- pending intent<\/li>\n<\/ol>\n
\npackage com.rakesh.alarmmanagerexample;\n\nimport java.text.Format;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\n\nimport android.app.AlarmManager;\nimport android.app.PendingIntent;\nimport android.content.BroadcastReceiver;\nimport android.content.Context;\nimport android.content.Intent;\nimport android.os.Bundle;\nimport android.os.PowerManager;\nimport android.widget.Toast;\n\npublic class AlarmManagerBroadcastReceiver extends BroadcastReceiver {\n\n final public static String ONE_TIME = \"onetime\";\n\n @Override\n public void onReceive(Context context, Intent intent) {\n PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);\n PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, \"YOUR TAG\");\n \/\/Acquire the lock\n wl.acquire();\n\n \/\/You can do the processing here.\n Bundle extras = intent.getExtras();\n StringBuilder msgStr = new StringBuilder();\n \n if(extras != null && extras.getBoolean(ONE_TIME, Boolean.FALSE)){\n \/\/Make sure this intent has been sent by the one-time timer button.\n msgStr.append(\"One time Timer : \");\n }\n Format formatter = new SimpleDateFormat(\"hh:mm:ss a\");\n msgStr.append(formatter.format(new Date()));\n\n Toast.makeText(context, msgStr, Toast.LENGTH_LONG).show();\n \n \/\/Release the lock\n wl.release();\n }\n\n public void SetAlarm(Context context)\n {\n AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);\n Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);\n intent.putExtra(ONE_TIME, Boolean.FALSE);\n PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent, 0);\n \/\/After after 5 seconds\n am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 1000 * 5 , pi); \n }\n\n public void CancelAlarm(Context context)\n {\n Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);\n PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);\n AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);\n alarmManager.cancel(sender);\n }\n\n public void setOnetimeTimer(Context context){\n AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);\n Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);\n intent.putExtra(ONE_TIME, Boolean.TRUE);\n PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent, 0);\n am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), pi);\n }\n}\n\n<\/pre>\nGiven below is the manifest file. Here, WAKE_LOCK permission is required because the wake lock is being used while processing in onReceive() method present in AlarmManagerBroadcastReceiver class. AlarmManagerBroadcastReceiver has been registered as broadcast receiver.<\/p>\n
\n\n\n \n \n \n \n \n \n \n \n \n \n \n \n\n<\/pre>\nNow let\u2019s define the activity class which defines some methods. These methods are going to handle the button clicks. Here in this class we create an instance of AlarmManagerBroadcastReciever which will help us to access setAlarm(), cancelAlarm() and setOnetime(). Rest of the code is easy to understand.<\/p>\n
\npackage com.rakesh.alarmmanagerexample;\n\nimport com.rakesh.alarmmanagerexample.R;\nimport android.os.Bundle;\nimport android.app.Activity;\nimport android.content.Context;\nimport android.view.Menu;\nimport android.view.MenuItem;\nimport android.view.View;\nimport android.widget.Toast;\nimport android.support.v4.app.NavUtils;\n\npublic class AlarmManagerActivity extends Activity {\n\n private AlarmManagerBroadcastReceiver alarm;\n @Override\n public void onCreate(Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n setContentView(R.layout.activity_alarm_manager);\n alarm = new AlarmManagerBroadcastReceiver();\n }\n \n @Override\n protected void onStart() {\n super.onStart();\n }\n\n public void startRepeatingTimer(View view) {\n Context context = this.getApplicationContext();\n if(alarm != null){\n alarm.SetAlarm(context);\n }else{\n Toast.makeText(context, \"Alarm is null\", Toast.LENGTH_SHORT).show();\n }\n }\n \n public void cancelRepeatingTimer(View view){\n Context context = this.getApplicationContext();\n if(alarm != null){\n alarm.CancelAlarm(context);\n }else{\n Toast.makeText(context, \"Alarm is null\", Toast.LENGTH_SHORT).show();\n }\n }\n \n public void onetimeTimer(View view){\n Context context = this.getApplicationContext();\n if(alarm != null){\n alarm.setOnetimeTimer(context);\n }else{\n Toast.makeText(context, \"Alarm is null\", Toast.LENGTH_SHORT).show();\n }\n }\n \n @Override\n public boolean onCreateOptionsMenu(Menu menu) {\n getMenuInflater().inflate(R.menu.activity_widget_alarm_manager, menu);\n return true;\n }\n}\n<\/pre>\nOnce you are done with the coding, just execute the project and you will find the similar kind of application running in your emulator.<\/p>\n
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