Overview:
Even when a 106/109 Japanese hardware keyboard is connected to an Android device via Bluetooth, it is treated as an English layout by default. (Symbols such as @ cannot be entered as engraved.)
This app adds the following Japanese layout for the 106/109 Japanese keyboard.

・ Standard Japanese layout
・ [Half / Full] and [ESC], [Convert] / [No Conversion] → [Ctrl], [Caps] → [Half / Full] etc.
-Layout with [Convert] / [No conversion] replaced with [Ctrl] to use [Ctrl] key with thumb

! ! ! Note! ! !
When a physical keyboard is connected, "Settings" → "Language & input" → "Physical keyboard" tapping "Keyboard layout selection" cannot be used on devices that are disabled by the manufacturer.
This limitation is due to the Android device manufacturer, and this application cannot handle it.

* This does not change the keyboard layout.
* The basic layout is “English layout”. Japanese keyboard layout is released as a separate app.