Clone the repo, then open the project in Android Studio.
Make sure the required Android NDK platforms are installed, and the environment
ANDROID_NDK_TOOLCHAIN_DIR is configured correctly.
On Windows, this might be a path such as the following (NDK "Side by side" SDK tool):
Set your API ID and hash in the rust code.
Change the Cargo.toml to point to a local grammers source tree and remove the version argument.
Sync gradle files, and Android Studio's "build" and "run" should Just Work.