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How to add vuforia to existing project

Hi, im have existing project for android studio 1.4 

 

im try add 

 


android.ndk {
File curDir = file('./')
curDir = file(curDir.absolutePath)
String libsDir = curDir.absolutePath+"/src/main/jniLibs/armeabi-v7a/" //"-L" +
ldLibs += ["android", "EGL", "GLESv2", "dl", "log",libsDir + "libVuforia.so"]

stl = "stlport_static"
} 

but activity crash on super.onCreate method ... if i not add some code in ndk app crash on try invoke native method privateSetInitParameters how i can add vuforia step by step in existing project ? plz help )