public static IntentFilter create(String action, String dataType) {
        try {
            return new IntentFilter(action, dataType);
        } catch (MalformedMimeTypeException e) {
            throw new RuntimeException("Bad MIME type", e);
        }
    }
Instances created, so must have implementation of action
rxandroidble/src/test/java/android/content/IntentFilter.java