Downloaded the sample projects and put it in
C:\projectsdev\android\vuforia-sdk-android-2-5-7\samples
C:\projectsdev\android\android-ndk-r8
C:\projectsdev\android\android-sdk
Then import the sample project to eclipse with ndk-build using cygwin. When i run the app in device, getting failed to initialize the QCAR.
Could you check the error messages logged by the device ?