We present a mobile and desktop keyboard suite for Idu Mishmi, an endangered Trans-Himalayan language spoken by approximately 11,000 people in Arunachal Pradesh, India. Although a Latin-based orthography was developed in 2018, no digital input tools existed to use it, forcing speakers into ad-hoc romanizations that cannot represent the full writing system. Our keyboards comprise two tools: (1) an Android mobile keyboard, published on the Google Play Store and actively used in teacher training programs, and (2) a Windows desktop keyboard currently undergoing community testing. Both tools support the complete Idu Mishmi character inventory, including schwa, retracted schwa, nasalized vowels, and accented forms. Both operate fully offline with zero network permissions, addressing connectivity constraints and data sovereignty concerns. We describe the design, implementation, and deployment as a replicable model for other endangered language communities.

翻译：我们为伊杜米什米语开发了一套移动端与桌面端键盘系统。伊杜米什米语是一种濒危的跨喜马拉雅语言，使用者约1.1万人，分布于印度阿鲁纳恰尔邦。尽管该语言已于2018年制定了基于拉丁字母的正字法，但此前缺乏相应的数字输入工具，导致使用者只能采用临时罗马化方案，无法完整呈现其文字系统。本键盘系统包含两款工具：(1) 已在Google Play商店发布并应用于教师培训项目的Android移动键盘；(2) 正处于社区测试阶段的Windows桌面键盘。两款工具均完整支持伊杜米什米语字符集，包括中性元音、后移中性元音、鼻化元音及带重音符号的字符形式。所有工具均支持完全离线运行且无需网络权限，有效应对了网络连接限制与数据主权问题。我们详细阐述了该系统的设计、实施与部署方案，旨在为其他濒危语言社群提供可复制的技术模型。