First of all Vuforia will not work with android emulator. you have ti have a real devices which support OpenGLES2.0 and you have to modify your android manifest file for it.

Please try not to skip any step involved in the sample

VinayKumar is right. You need to follow the steps in Getting Started - SDK for building and running the samples - https://ar.qualcomm.at/qdevnet/sdk

Thank for VinayKumar
but if these steps are clear
i install apk to my phone(Desire HD HTC).
it can run?

Yes. Be sure to compile the shared libraries first using ndk-build.

OK thanks for your Proposal
but i want to know step.3 of 1 "Compile the Shared Object" how to do?
i'm too new to AR
please give me a advice

be sure your sysytem path already add your ndk folder
for example

C:\>path
PATH=c:\Development\Android\android-ndk-r7b

then change folder to your sample folder
then type ndk-build

you will see like these messages
#not really 100% the same

C:\Development\Android\vuforia-sdk-android-1-5-9\samples\ImageTargets>ndk-build

Gdbserver : [arm-linux-androideabi-4.4.3] libs/armeabi/gdbserver
Gdbsetup : libs/armeabi/gdb.setup
Gdbserver : [arm-linux-androideabi-4.4.3] libs/armeabi-v7a/gdbserver
Gdbsetup : libs/armeabi-v7a/gdb.setup
Install : libImageTargets.so => libs/armeabi/libImageTargets.so
Install : libQCAR.so => libs/armeabi/libQCAR.so
Install : libImageTargets.so => libs/armeabi-v7a/libImageTargets.so
Install : libQCAR.so => libs/armeabi-v7a/libQCAR.so

FINISH!

thanks for Moser
and this step "then change folder to your sample folder
then type ndk-build" what it means?
please tell more detail
thanks!

Have you set up Cygwin? You can use the "cd" command in Cygwin to change directories to the sample folder. Something like this:

cd /cygdrive/c/Development/Android/vuforia-sdk-android-1-5-9/samples/ImageTargets

(change the path as needed)

Then type "ndk-build". This assumes the Android NDK is already on your PATH.

Follow Step 1 of the Getting Started guide closely: https://ar.qualcomm.at/qdevnet/

- Kim