Let me add to this: NO NO NO! You can mess up your change address if you don't know what you're doing, so just swipe the entire balance (and pay a transaction fee for this) instead of importing the private key.
I like using Mycelium Android wallet, it's very easy to import from the QR-code.
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swipe so when swiping (it gets the whole balance of the wallet) I don't need to import private keys .... That would work for a donation address right? , use that address (fix) just swipe it every time the balance got higher... [private key never touches the internet]
but how do i swipe a paper wallet in that way? (only way to spend coins is thru private keys right?, then still touches the internet)..