Get list of active PendingIntents in AlarmManager

Solution 1:

adb shell dumpsys alarm > dump.txt

dump.txt:

Current Alarm Manager state:

  Realtime wakeup (now=1309361618777):
  RTC_WAKEUP #5: Alarm{4822f618 type 0 com.google.android.gsf}
    type=0 when=1309882326582 repeatInterval=522747000 count=0
    operation=PendingIntent{47dd3740: PendingIntentRecord{4822aeb8 com.google.android.gsf broadcastIntent}}
  ...
  RTC #5: Alarm{4810f9d8 type 1 com.tmobile.selfhelp}
    type=1 when=1309445979715 repeatInterval=86400000 count=1
    operation=PendingIntent{4815a5c8: PendingIntentRecord{4810f960 com.tmobile.selfhelp startService}}
  RTC #4: Alarm{4810f668 type 1 com.tmobile.selfhelp}
    type=1 when=1309445959620 repeatInterval=86400000 count=1
    operation=PendingIntent{480996e8: PendingIntentRecord{480214a0 com.tmobile.selfhelp broadcastIntent}}
  ...

  Elapsed realtime wakeup (now=2110632):
  ELAPSED_WAKEUP #5: Alarm{481c24e0 type 2 com.google.android.apps.maps}
    type=2 when=2147485512925 repeatInterval=0 count=0
    operation=PendingIntent{47d1d3a8: PendingIntentRecord{481a2600 com.google.android.apps.maps broadcastIntent}}     
  ...
  ELAPSED #1: Alarm{4829ce98 type 3 android}
    type=3 when=2512653 repeatInterval=0 count=0
    operation=PendingIntent{47eabda8: PendingIntentRecord{47f20250 android broadcastIntent}}
  ELAPSED #0: Alarm{480f0198 type 3 com.mixzing.basic}
    type=3 when=2439998 repeatInterval=0 count=0
    operation=PendingIntent{48100dd8: PendingIntentRecord{480ff5a0 com.mixzing.basic broadcastIntent}}

  Broadcast ref count: 0

  Alarm Stats:
  com.google.android.location
    3ms running, 1 wakeups
    1 alarms: act=com.google.android.location.ALARM_WAKEUP flg=0x4
  com.google.android.gsf
    274ms running, 4 wakeups
    1 alarms: flg=0x4
    1 alarms: act=com.google.android.intent.action.GTALK_RECONNECT flg=0x4
    2 alarms: act=com.google.android.intent.action.GTALK_HEARTBEAT flg=0x4
 ...
-------------------------------------------------------------------------------

Solution 2:

adb shell dumpsys alarm > dump.txt is the way to go and you don't need root permission for that. But what you get from above could be very confusing to understand. In order to understand that dump completely you should check out morphatic's answer here.