Original Summary

I kept losing my friends at festivals, so I built an Android app that doesn't need the internet 🛰️ At large festivals and events I've always found the same thing happens: thousands of people arrive, mobile data becomes painfully slow or stops working entirely, and inevitably I wander off and lose everyone. So I wondered: what if finding your friends didn't depend on the mobile network at all? I built Offlink, an Android app that uses Bluetooth Low Energy to exchange location information between nearby phones. The interesting bit is that the phones form a small offline mesh network. A friend doesn't necessarily have to be within Bluetooth range of you. Location updates can be passed between participating devices and relayed through the crowd. No mobile data. No Wi-Fi. No internet connection. I've spent the last few months testing it across multiple Android phones, including multi-hop tests where devices couldn't communicate directly with each other. After navigating Google's closed-testing process, Offlink is now properly live on Google Play 🎉 I'd really love to get some real-world testing outside my own collection of phones now, particularly at busy events. If you've got an Android phone and fancy trying it, you can download it directly from Google Play: https://play.google.com/store/apps/details?id=com.offlink It's free. If you find a bug, something confusing, or just think something could work better, I'd genuinely like to hear it. And if anyone's interested in the technical side of the Bluetooth mesh, I'm very happy to nerd out about how it works. 😄   submitted by   /u/gurprit [link]   [comments]

中文概览

中文标题： Offlink——Google Play 应用

作者因在大型活动上常与朋友走散而开发 Offlink Android 应用。它使用蓝牙低功耗在附近手机间交换位置信息，设备可组成离线 Mesh 网络，让位置更新通过人群中的其他设备中继，无需移动数据、Wi-Fi 或互联网。经过多台手机及多跳测试后，应用已在 Google Play 上线，免费，作者希望获得真实活动场景测试与反馈，也愿意讨论蓝牙 Mesh 技术。

  • 情报分类：开源项目与落地
  • 分类依据：个人开发的Android蓝牙离线Mesh定位应用已上线Google Play并寻求真实测试反馈，属项目落地。
  • 信息来源：Reddit · SideProject
  • 发布时间：2026/9/15 23:13:29