Fcitx5 Android has an Anthy plugin. Mozc support is planned but they need to support custom keyboard layout first. We highlight it in F-Droid Alphas and good news for CJK users | F-Droid - Free and Open Source Android App Repository. You can also use rime via Trime or Fcitx5 Android Rime Plugin with a Japanese scheme, e.g. GitHub - gkovacs/rime-japanese: 日语输入法 Input method for typing Japanese with RIME.
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