android.annotation cannot be resolved

by

Wich API do you Refered in your project.

Because

android.annotation.SuppressLint – it’s since Added in API level 16

http://developer.android.com/reference/android/annotation/SuppressLint.html

You need do next

You project rigth mouse click->Properties and check next picture for you select Project Build Target for API Level >=16

enter image description here

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