NDK is not configured issue in android studio
This is the problem faced by Android studio users in Windows environment. First for NDK not Configured problem
Go to local.properties
file and give ndk
path...
for ex :
#Wed Mar 18 14:10:33 IST 2015
sdk.dir=C\:\\Users\\admin\\AppData\\Local\\Android\\sdk1
ndk.dir=C\:\\Users\\admin\\AppData\\Local\\Android\\ndk
Then for the Next Problem or Error...
Goto JNI Folder and create an empty c file by any name... Then your problem will be solved...
Some Quick links about this are http://ph0b.com/android-studio-gradle-and-ndk-integration/ And https://code.google.com/p/android/issues/detail?id=66937
Go to option File->Project Structure
Select SDK Location->Android NDK Location and choose NDK listed in dropdown