I've been thinking about an app idea and would love to get some feedback.

The idea is a **collaborative download app** for Android where a group of nearby users can combine their mobile data to download large files faster. For example, imagine **4 friends** meet at a café to play a game, but a **4 GB update** is required before they can start. Instead of each person downloading the full 4 GB, the app splits the file into four 1 GB chunks. Each phone downloads a different chunk using its own mobile data connection, then the phones exchange those chunks locally using **Wi-Fi Direct**. In the end, everyone has the complete file, but each person only used about **1 GB** of mobile data. Other scenarios could include families downloading a movie before a flight, students downloading large datasets during a hackathon when Wi-Fi is overloaded, or teams working in places with poor internet. From a technical perspective, I'm thinking of using HTTP range requests for downloading file segments, Wi-Fi Direct for local sharing, and automatically selecting the best device as the group owner based on battery, signal strength, and hardware. My main questions are: * Is this technically feasible on modern Android versions? * Are there any major limitations with Android networking or Wi-Fi Direct that would make this impractical? * Has anyone seen an app that already does something similar? I'd really appreciate any feedback, criticism, or suggestions before I spend time building a prototype.