Video-Calling Over WiFi without any intermediate server or 3rd party connection like Skype

I want to facilitate video-calling from the android device to another android device. My question is that can i connect the android WiFi device with the android WiFi device without any use of internet connection. I want to use it just like the Skype. is this possible or not? if it is possible then how can i implement it...can i get some code snippets as well???? Please give me link to download that app开发者_运维知识库

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First, your idea works completely different from Skype, which is completely dependent on a functional Internet connection for its core functionality.

Second, while you could create an ad-hoc WiFi network betweeen two Android devices, their range will be the limiting factor:

• WiFi is intended as a short-range wireless medium. There's a reason nobody wanted the 2.4 GHz band (and therefore it is unlicensed): there's a significant noise and signal loss on these frequencies, noticeable even at short range.
• Moreover, wireless equipment in mobile devices is engineered for power efficiency - which translates to lower broadcast power when compared to on-the-grid devices.
• Also, the antennae in such devices are omnidirectional - this is rather useful for normal use, but again lowers your available broadcast power
• Even if you had huge, high-quality directional external antennae connected to each device, pointing very precisely at each other (btw that also means each of them is stuck in one place; see e.g. this for a dish size calculator), you'd need to make some pretty drastic changes to their networking stack, as the latency inherent in long-distance comms will screw up TCP/IP pretty badly.
• Even so, the setup would be very brittle, dependent even on the weather (water vapour absorbs significant amount of power in that part of the spectrum).