title: Android cannot pass intent extras though AlarmManager
body: <p>I am trying to put an extra message in my intent to pass to AlarmManager to be triggered at a later time. My onReceive triggers correctly but extras.getString() returns null</p>
  
  <p>Setup:</p>
  
  <pre><code>public PendingIntent getPendingIntent(int uniqueRequestCode, String extra) {
      Intent intent = new Intent(this, ActionReceiver.class);
      intent.putExtra("EXTRA", extra);
      PendingIntent pendingIntent = PendingIntent.getBroadcast(this, uniqueRequestCode,
              intent, 0);
      return pendingIntent;
  }
  
  public void setSilentLater(TimeRule timeRule) {
      boolean[] weekdays = timeRule.getReoccurringWeekdays();
      int dayOfWeek = 0;
  
      for (boolean day : weekdays) {
          dayOfWeek++;
          if (day == true) {
              Calendar cal = Calendar.getInstance();
  
              AlarmManager alarmManager = (AlarmManager) this
                      .getSystemService(Context.ALARM_SERVICE);
  
              cal.set(Calendar.DAY_OF_WEEK, dayOfWeek);
              cal.set(Calendar.HOUR_OF_DAY,
                      timeRule.getStartTime().get(Calendar.HOUR_OF_DAY));
              cal.set(Calendar.MINUTE,
                      timeRule.getStartTime().get(Calendar.MINUTE));
              cal.set(Calendar.SECOND, 0);
              cal.set(Calendar.MILLISECOND, 0);
  
              alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
                      cal.getTimeInMillis(), 3600000 * 7, getPendingIntent(0, "RINGER_OFF"));
    }
   }
  }
  </code></pre>
  
  <p>When this triggers, message is empty:</p>
  
  <pre><code>public class ActionReceiver extends BroadcastReceiver {
  
      @Override
      public void onReceive(Context context, Intent intent) {
           Bundle extras = intent.getExtras();
           String message = extras.getString("EXTRA"); //empty        
           if(message == "RINGER_OFF")
           {
               AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
               am.setRingerMode(AudioManager.RINGER_MODE_SILENT);
           }
           else if(message == "RINGER_ON")
           {
               AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
               am.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
           }
      }
  }
  </code></pre>