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Phenomological is right, to a point.
You dont need a tripod, so long as you are only making a 'pseudo' HDR image, and you dont need to shoot in RAW format. because what most people mean when they say HDR photography, they really mean tonemapping.
Tonemapping does this to a photograph..
Original (from my Desire)
......
each of those tonemapped images took about a minute and a half to render using a rather lowly 3800 Mhz dual core processor, any HDR software for an android phone would eat your already sucked and chewed battery life to the bone!
Go get a free one and do your rendering on the PC.
benjiharris spotted the one I found, but there has been reports of 360 draining the battery substantially