mobium locale

This tool on every surface: CLI · MCP · Python · JavaScript · Go · Java · .NET

Read or set the language one app runs in

With no tag, prints the app's language and the device's.

Per app rather than device-wide: it is reversible, needs no restart, and it is the question actually being asked — does this screen work in Japanese. Pass an empty string to follow the device again.

Android 13 and later. What mobium confirms is that the device stored the tag; whether the app has that translation is not something Android reports, so look at the screen. Relaunch the app to re-render it.

Usage

mobium locale <app> [tag] [flags]

Examples

Run one app in Japanese

mobium locale org.wikipedia ja-JP

Printed on an Android 15 emulator:

org.wikipedia set to ja-JP — the device stored it; whether org.wikipedia has that translation is not something Android reports, so check the screen

More, from mobium locale --help

mobium locale org.wikipedia          # what language is it in?
mobium locale org.wikipedia ja-JP
mobium locale org.wikipedia ""       # back to the device's language

On a device

mobium launch org.wikipedia on an Android 15 emulator

The tool

locale calls app_locale; its arguments and what every client calls it are there.