android: gradle-based package and samples

- drop hello-android sample

modules/java/jni/CMakeLists.txt

@@ -13,6 +13,12 @@ foreach(m ${OPENCV_MODULES_BUILD})
   endif()
 endforeach()
 
+if(ANDROID)
+  ocv_update(JNI_OUTPUT_PATH  "${OpenCV_BINARY_DIR}/jni/${ANDROID_NDK_ABI_NAME}")
+else()
+  ocv_update(JNI_OUTPUT_PATH  "${LIBRARY_OUTPUT_PATH}")
+endif()
+
 set(__type MODULE)
 if(BUILD_FAT_JAVA_LIB)
   set(__type SHARED) # samples link to libopencv_java
@@ -60,7 +66,7 @@ endif()
 set_target_properties(${the_module} PROPERTIES
     OUTPUT_NAME "${the_module}${OPENCV_JAVA_LIB_NAME_SUFFIX}"
     ARCHIVE_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH}
-    LIBRARY_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH}
+    LIBRARY_OUTPUT_DIRECTORY ${JNI_OUTPUT_PATH}
     RUNTIME_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH}
     DEFINE_SYMBOL CVAPI_EXPORTS
     )