FuriganIt

With FuriganIt you can easily get kanji reading inside any app or website - just select or copy text. And all of that can be done without internet connection.

You can use it in two ways:
1. Get furigana from copied text - copy any text and press button in app's notification
2. Select japanese text and click on 'Get furigana' option inside popup system window


FuriganIt use libraries: kuromoji-core, kuromoji-ipadic

Source code available:
https://github.com/SYtor/FuriganIt