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: PLAY STORE LINK 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： 我总在音乐节上和朋友走散，于是做了一款无需联网的 Android 应用

作者因大型音乐节移动数据慢或不可用而常与朋友走散，开发了 Android 应用 Offlink：用蓝牙低功耗在附近手机间交换位置信息，形成小型离线 mesh 网络，位置更新可由人群中的设备中继，无需移动数据、Wi-Fi 或互联网。作者测试多台 Android 手机数月，含设备无法直接通信的多跳测试，并通过 Google 封闭测试后上线 Google Play。应用免费，作者希望更多人在繁忙活动中测试并反馈。

  • 情报分类：开源项目与落地
  • 分类依据：个人开发Android离线蓝牙mesh定位应用并上线Google Play，属项目落地。
  • 信息来源：Reddit · SideProject
  • 发布时间：2026/9/15 23:16:42