用摩斯密码给朋友定制专属来电震动：一个 Android 应用的旧项目复盘
Giving friends custom text buzzes based on Morse code
作者多年前开发过一款 Android 应用，可在来电时为对方设备设置专属铃声，但因 iPhone 无法由客户端在后台修改铃声而放弃推广，如今想做类似功能只能回到 Android。作者表示该做法没有专利且存在先例，最接近的专利来自一家电视厂商——通过电视播放声音帮用户寻找遥控器。
Many many many years ago, I wrote an android app that allowed you to set the ringtone of the device you were ringing for that call (yes they had to have the app installed etc etc, and had given you permission to do it). I did release it but the market problem I had was that iPhone's ringtones were not something a client app could change, let alone in the background and even less so without direct permission of the user.
So anyway, if you want to do something like that, it's back to android I'm afraid. Don't worry, there's no patent and there's prior art (i.e. my usage). FWIW - the closest patent to it was made by a TV manufacturer that would allow you to find the remote control by playing a noise etc directed by the TV !
来源：Hacker News · 首页 · news.ycombinator.com