Para recuperar actividades de un activo, utilice RAMAsset.getActivites(int[] ids, long fromDate, long toDate).
Calendar cal = Calendar.getInstance();
cal.roll(Calendar.DATE, true);
long tomorrow = cal.getTimeInMillis();
cal = Calendar.getInstance();
cal.roll(Calendar.DATE, false);
long yesterday = cal.getTimeInMillis();
AssetActivity[] activities = newAsset.getActivites(new int[]{1000, 1010, 1099},
yesterday, tomorrow);