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copied!<p>There are some good examples in the android sample code</p> <blockquote> <p>.\android-sdk\samples\android-10\ApiDemos\src\com\example\android\apis\app</p> </blockquote> <p>The ones to check out are:</p> <ul> <li>AlarmController.java</li> <li>OneShotAlarm.java</li> </ul> <p>First of, you need a receiver, something that can listen to your alarm when it is triggered. Add the following to your AndroidManifest.xml file</p> <pre><code><receiver android:name=".MyAlarmReceiver" /> </code></pre> <p>Then, create the following class</p> <pre><code>public class MyAlarmReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Toast.makeText(context, "Alarm went off", Toast.LENGTH_SHORT).show(); } } </code></pre> <p>Then, to trigger an alarm, use the following (for instance in your main activity):</p> <pre><code>AlarmManager alarmMgr = (AlarmManager)getSystemService(Context.ALARM_SERVICE); Intent intent = new Intent(this, MyAlarmReceiver.class); PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0); Calendar time = Calendar.getInstance(); time.setTimeInMillis(System.currentTimeMillis()); time.add(Calendar.SECOND, 30); alarmMgr.set(AlarmManager.RTC_WAKEUP, time.getTimeInMillis(), pendingIntent); </code></pre> <p>. </p> <hr> <p>Or, better yet, make a class that handles it all and use it like this</p> <pre><code>Bundle bundle = new Bundle(); // add extras here.. MyAlarm alarm = new MyAlarm(this, bundle, 30); </code></pre> <p>this way, you have it all in one place (don't forget to edit the <code>AndroidManifest.xml</code>)</p> <pre><code>public class MyAlarm extends BroadcastReceiver { private final String REMINDER_BUNDLE = "MyReminderBundle"; // this constructor is called by the alarm manager. public MyAlarm(){ } // you can use this constructor to create the alarm. // Just pass in the main activity as the context, // any extras you'd like to get later when triggered // and the timeout public MyAlarm(Context context, Bundle extras, int timeoutInSeconds){ AlarmManager alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE); Intent intent = new Intent(context, MyAlarm.class); intent.putExtra(REMINDER_BUNDLE, extras); PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); Calendar time = Calendar.getInstance(); time.setTimeInMillis(System.currentTimeMillis()); time.add(Calendar.SECOND, timeoutInSeconds); alarmMgr.set(AlarmManager.RTC_WAKEUP, time.getTimeInMillis(), pendingIntent); } @Override public void onReceive(Context context, Intent intent) { // here you can get the extras you passed in when creating the alarm //intent.getBundleExtra(REMINDER_BUNDLE)); Toast.makeText(context, "Alarm went off", Toast.LENGTH_SHORT).show(); } } </code></pre>

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