Cannot select spell checking service in Huawei

Hello,

I have developed a spell service that extends Android's SpellCheckerService (http://developer.android.com/reference/android/service/textservice/SpellCheckerService.html) to provide a grammar spell checker based on LanguageTool open source project.

Here is the source code: https://github.com/Softcatala/LanguageToolAndroidService/

See also: https://play.google.com/store/apps/details?id=org.softcatala.corrector

However, users from Android 4.4.4 (Huawei) devices are reporting that they cannot select the spell checker service (Settings -> Language Input -> Spell Checker ) in their Android device. The reason is because my spell checker appears as grayed out option.

What's the right way to do this in a Huawei Android device?

Is there anything special with permissions or any other matter?

Any help will be appreciated

Jordi