A Color-to-grayscale Android app configured with CMake tool under Android Studio with OpenCV support.

• Android Studio 2.3.3

  Gradle version 3.3, Gradle Android Plugin 2.3.3

• Android NDK r15b

• JDK 8u141

• Android 7.0 (API Level 24)

• OpenCV 3.2 Android SDK

  Only native sdk is utilized. No OpenCV Java API is required.

1. Change Line #22 in app\build.gradle and Line #14 in app\CMakeLists.txt to your<OpenCV Android SDK>/sdk/native/libs.
2. Change Line #16 in app\CMakeLists.txt to your <OpenCV Android SDK>/sdk/native/jni/include.
3. Re-sync and run.

1. Change Line #22 in app\build.gradle to jniLibs.srcDirs = ['src/main/jniLibs']. Change Line #14 in app\CMakeLists.txt to set(ocvlibs "${CMAKE_SOURCE_DIR}/src/main/jniLibs"). Copy all files in <OpenCV Android SDK>/sdk/native/libs to app\src\main\jniLibs.
2. Change Line #16 in app\CMakeLists.txt to include_directories(${CMAKE_SOURCE_DIR}/src/main/cpp/include). Copy all files in <OpenCV Android SDK>/sdk/native/jni/include to app\src\main\cpp\include.
3. Re-sync and run.

1. Change Line #22 in app\build.gradle to jniLibs.srcDirs = ['src/main/jniLibs']. Change Line #14 in app\CMakeLists.txt to set(ocvlibs "${CMAKE_SOURCE_DIR}/src/main/jniLibs"). Create symlink app\src\main\jniLibs targeting <OpenCV Android SDK>/sdk/native/libs.
2. Change Line #16 in app\CMakeLists.txt to include_directories(${CMAKE_SOURCE_DIR}/src/main/cpp/include). Create symlink app\src\main\cpp\include targeting <OpenCV Android SDK>/sdk/native/jni/include.
3. Re-sync and run.

如果您懂中文，欢迎来阅读我的文章《Android Studio 2.3利用CMAKE进行OpenCV 3.2的NDK开发》。

This OpenCV-NDK project is released under the MIT license.