You shouldn't set a max sdk. You can set minSdk to 18, and targetSdk to 21. 
If you set a max, that means if there's a new android version, people won't 
be able to download your app, you'll have to make an update.

As for the error you get, it's mainly a lint error. If the code is in an if 
statement like you showed, there's no reason someone with API 18 enters 
into this if statement. You'll just have to add @SuppressLint("NewApi") 
before your method.

Have a look at this stackoverflow page, it'll help.

http://stackoverflow.com/questions/11592820/writing-backwards-compatible-android-code

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