5. Consider implementing it like Bluetooth file transfer. The app must be installed on both devices. Pair/authenticate the devices, then select the file and the receiver device. Transfer will start immediately. The app running in background in the receiver device will detect the incoming file(s) and transfer them, without user intervention. Of course, include an option to "ask always". For non-Android devices, there's web based transfer/QR code.
Just discovered your app and have to say it's brilliant. I've always been searching for an app allowing me to send files via wifi between to devices using the Hotspot functionality. You just made my day the only thing that could improve your app is a holo design and the already mentioned nfc feature
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