android - automatically detect unused drawables

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http://stackoverflow.com – The matter: I used many icons and pictures while developing an android application, later I replaced many of them but kept the old ones in case I would need to use them again. Now I have a huge amount of .png's in my drawable folder, many are now unused and it would take ages to manually sort them out. Is there a way to detect drawables to which no references exist? (HowTos)