New sample for CUDA on Android added.

samples/android/tutorial-4-cuda/jni/Android.mk

@@ -0,0 +1,13 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+CUDA_TOOLKIT_DIR=$(CUDA_TOOLKIT_ROOT)
+include ../../sdk/native/jni/OpenCV.mk
+
+LOCAL_MODULE    := cuda_sample
+LOCAL_SRC_FILES := jni_part.cpp
+LOCAL_LDLIBS +=  -llog -ldl
+LOCAL_LDFLAGS += -Os
+
+include $(BUILD_SHARED_LIBRARY)

samples/android/tutorial-4-cuda/jni/Application.mk

@@ -0,0 +1,4 @@
+APP_STL := gnustl_static
+APP_CPPFLAGS := -frtti -fexceptions
+APP_ABI := armeabi-v7a
+APP_PLATFORM := android-8

samples/android/tutorial-4-cuda/jni/jni_part.cpp

@@ -0,0 +1,35 @@
+#include <jni.h>
+#include <opencv2/core/core.hpp>
+#include <opencv2/imgproc/imgproc.hpp>
+#include <opencv2/features2d/features2d.hpp>
+#include <opencv2/gpu/gpu.hpp>
+#include <vector>
+
+using namespace std;
+using namespace cv;
+using namespace cv::gpu;
+
+#include <android/log.h>
+
+#define LOG_TAG "Cuda"
+#define LOGD(...) ((void)__android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__))
+
+extern "C" {
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_Tutorial4Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba);
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_Tutorial4Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba)
+{
+    Mat& mGr  = *(Mat*)addrGray;
+    Mat& mRgb = *(Mat*)addrRgba;
+    vector<KeyPoint> keypoints;
+    GpuMat grGpu(mGr);
+
+    FAST_GPU fast(50);
+    fast(grGpu, GpuMat(), keypoints);
+    for( unsigned int i = 0; i < keypoints.size(); i++ )
+    {
+        const KeyPoint& kp = keypoints[i];
+        circle(mRgb, Point(kp.pt.x, kp.pt.y), 10, Scalar(255,0,0,255));
+    }
+}
+}