adding cmake based android scripts and a reusable android library - samples to follow - haven't tested yet completely

android/android-jni/Makefile

@@ -0,0 +1,75 @@
+# The path to the NDK, requires crystax version r-4 for now, due to support
+#for the standard library
+
+#load environment from local make file
+LOCAL_ENV_MK=local.env.mk
+ifneq "$(wildcard $(LOCAL_ENV_MK))" ""
+include $(LOCAL_ENV_MK)
+else
+$(shell cp sample.$(LOCAL_ENV_MK) $(LOCAL_ENV_MK))
+$(info ERROR local environement not setup! try:)
+$(info gedit $(LOCAL_ENV_MK))
+$(info Please setup the $(LOCAL_ENV_MK) - the default was just created')
+include $(LOCAL_ENV_MK)
+endif
+
+ANDROID_NDK_BASE = $(ANDROID_NDK_ROOT)
+
+$(info OPENCV_CONFIG = $(OPENCV_CONFIG))
+
+# The name of the native library
+LIBNAME = libandroid-opencv.so
+
+# Find all the C++ sources in the native folder
+SOURCES = $(wildcard jni/*.cpp)
+HEADERS = $(wildcard jni/*.h)
+SWIG_IS = $(wildcard jni/*.i)
+
+ANDROID_MKS = $(wildcard jni/*.mk)
+
+SWIG_MAIN = jni/android-cv.i
+
+SWIG_JAVA_DIR = src/com/opencv/jni
+SWIG_JAVA_OUT = $(wildcard $(SWIG_JAVA_DIR)/*.java)
+
+SWIG_C_DIR = jni/gen
+SWIG_C_OUT = $(SWIG_C_DIR)/android_cv_wrap.cpp
+
+# The real native library stripped of symbols
+LIB		= libs/armeabi-v7a/$(LIBNAME) libs/armeabi/$(LIBNAME)
+
+
+all:	$(LIB)
+
+
+#calls the ndk-build script, passing it OPENCV_ROOT and OPENCV_LIBS_DIR
+$(LIB): $(SWIG_C_OUT) $(SOURCES) $(HEADERS) $(ANDROID_MKS)
+	$(ANDROID_NDK_BASE)/ndk-build OPENCV_CONFIG=$(OPENCV_CONFIG) \
+	PROJECT_PATH=$(PROJECT_PATH) V=$(V) $(NDK_FLAGS)
+
+
+#this creates the swig wrappers
+$(SWIG_C_OUT): $(SWIG_IS)
+	make clean-swig &&\
+	mkdir -p $(SWIG_C_DIR) &&\
+	mkdir -p $(SWIG_JAVA_DIR) &&\
+	swig -java -c++ -package "com.opencv.jni" \
+	-outdir $(SWIG_JAVA_DIR) \
+	-o $(SWIG_C_OUT) $(SWIG_MAIN)
+	
+	
+#clean targets
+.PHONY: clean  clean-swig cleanall nogdb
+
+nogdb: $(LIB)
+	rm -f libs/armeabi*/gdb*
+
+#this deletes the generated swig java and the generated c wrapper
+clean-swig:
+	rm -f $(SWIG_JAVA_OUT) $(SWIG_C_OUT)
+	
+#does clean-swig and then uses the ndk-build clean
+clean: clean-swig
+	$(ANDROID_NDK_BASE)/ndk-build OPENCV_CONFIG=$(OPENCV_CONFIG) \
+	PROJECT_PATH=$(PROJECT_PATH) clean V=$(V) $(NDK_FLAGS)
+