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Create a drawing application for PDF.
I will provide source for PDF reader(with already implemented design) and can provide some open-source solutions for drawing at android.
Drawing app should have ability to save drawing on PDF document as PDF or image files and send it throw email(throw java code without showing the actual mail client).
In attached file design for an app. Please feel free to contact me for any details.
It is quite urgent project have to be done in 2-3 weeks.