title: Android: Get all PendingIntents set with AlarmManager
body: <p>I'm setting an alarm like this:</p>
  
  <pre><code>alarmManager.set(AlarmManager.RTC_WAKEUP, alarmTime, pendingEvent);
  </code></pre>
  
  <p>I'm interested in removing all the alarms that where previously set, clearing them.</p>
  
  <p>Is there a way for me to do that or to get all the alarms that are currently set so that I can delete them manually ? </p>