To build the app 

1. build Iotivity with TARGET_OS=android

2. Copy aar files into app/libs folder
   - {Iotivity_root}/android/android_api/base/build/outputs/aar/iotivity-{TARGET_ARCH}-base-{MODE}.aar
   - {Iotivity_root}/service/resource-encapsulation/android/service/build/outputs/aar/iotivity-{TARGET_ARCH}-service-{MODE}.aar

3. Configure dependencies for libs in app/build.gradle
   - default TARGET_ARCH is armeabi
   - default MODE is release

   for example, if you build Iotivity as follows,
   
   $scons TARGET_OS=android TARGET_ARCH=x86 RELEASE=0

   then, dependencies should be modified like below

   dependencies {
      compile(name:'iotivity-x86-service-debug', ext:'aar')
      compile(name:'iotivity-x86-base-debug', ext:'aar')
   }