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--- tips:opencv:install [2018/06/12 07:59] – scipio
+++ tips:opencv:install [2018/06/13 09:06] (current) – scipio
@@ Line 1: / Line 1: @@
 ====== opencv install ======
+===== android studio =====
+[[https://stackoverflow.com/questions/50433813/how-to-add-opencv-lib-to-as3-1-2-and-ndk-17-0|integrate opencv in android studio project]]
 ===== linux  =====
@@ Line 76: / Line 80: @@
 </code>
-===== android method 1 =====
+===== android =====
 prereq:
-  * substitute /opt/android-sdk/tools with https://dl.google.com/android/repository/tools_r25.2.5-linux.zip
+  * android SDK in REAL_ANDROID_SDK (REAL_ANDROID_SDK=/opt/android-sdk) with NDK installed
-  * android sdk in /opt/android-sdk
+Download a stub android sdk and opencv sources
 <code>
-cd /opt
+# adjust these paths ##
-git clone -b 3.4 --depth 1 https://github.com/opencv/opencv.git opencv.git
+REAL_ANDROID_SDK=/opt/android-sdk
-</code>
+# output builded opencv, can be removed after
+BASE=/opt/OpenCV-android-sdk.custom
+#######################
-<file python platforms/android/ndk.config.py>
+mkdir -p ${BASE}
-vars=dict(BUILD_ANDROID_PROJECTS='OFF')
+cd ${BASE}
+wget https://dl.google.com/android/repository/tools_r25.2.5-linux.zip
+unzip tools_r25.2.5-linux.zip
+tool/android sdk
+Select and install the following two packages:
+        Android SDK Build-tools 27.0.3
+        Android 8.1.0 (API 27) -> SDK Platform
-ABIs = [
+git clone --depth 1 https://github.com/opencv/opencv.git
-    #ABI("2", "armeabi-v7a", "arm-linux-androideabi-4.9", cmake_vars=dict(ANDROID_ABI='armeabi-v7a with NEON')),
+cd opencv
-    #ABI("1", "armeabi",     "arm-linux-androideabi-4.9", cmake_vars=dict(WITH_TBB='OFF')),
+wget https://gist.githubusercontent.com/ngriffiths/296e2fc16b8586705712d50bdfe746b0/raw/350a8cb6497bfe367dda75b7bb202d6c7ce09a72/always-use-ant__find_android.patch && git apply always-use-ant__find_android.patch
-    ABI("3", "arm64-v8a",   "aarch64-linux-android-4.9", cmake_vars=vars),
+git apply always-use-ant__find_android.patch
-    ABI("5", "x86_64",      "x86_64-4.9", cmake_vars=vars),
-    #ABI("4", "x86",         "x86-4.9"),
-]
-</file>
-create /opt/OpenCV-android-sdk-compiled
+cd platform/android
-<code>
-cd /opt/opencv.git
-python ./platforms/android/build_sdk.py \
- --config ndk.config.py \
- --ndk_path /opt/android-sdk/ndk-bundle \
- --sdk_path /opt/android-sdk \
- /opt/OpenCV-android-sdk-compiled .
-</code>
-===== android method 2 =====
+# edit ndk-16.config.py
+# ABI("3", "arm64-v8a",   "aarch64-linux-android-4.9", cmake_vars=dict(BUILD_ANDROID_PROJECTS='OFF')),
-Thank you to everyone for your help.
+ANDROID_SDK=${BASE} ANDROID_HOME=${BASE} ./build_sdk.py \
+	--force_opencv_toolchain \
-I recently had to build OpenCV for Android from source (because I wanted to link against LLVM libc++ STL instead of GNU STL). In case it’s useful to anyone else, here are some quick instructions on how I did it:
+	--ndk_path ${REAL_ANDROID_SDK}/ndk-bundle \
+	--config ndk-16.config.py \
-<code>
+	${BASE}/build
-    $ mkdir ~/sdk && cd ~/sdk
-    $ wget https://dl.google.com/android/repository/tools_r25.2.5-macosx.zip && unzip tools_r25.2.5-macosx.zip
-    $ tools/android sdk
-    Select and install the following two packages:
-        Android SDK Build-tools 27.0.3
-        Android 8.1.0 (API 27) -> SDK Platform 27
-    $ mkdir ~/opencv && cd ~/opencv
-    $ git clone https://github.com/opencv/opencv.git
-    $ cd ~/opencv/opencv
-    $ wget https://gist.githubusercontent.com/ngriffiths/296e2fc16b8586705712d50bdfe746b0/raw/350a8cb6497bfe367dda75b7bb202d6c7ce09a72/always-use-ant__find_android.patch && git apply always-use-ant__find_android.patch
-    $ cd platforms/android
-    $ ANDROID_SDK=~/sdk ANDROID_HOME=~/sdk ./build_sdk.py --config ndk-16.config.py ~/opencv/build
 </code>
-I already had the ANDROID_NDK environment variable set to a local NDK 16 installation.
+To compile against libc++, I then changed ANDROID_STL="gnustl_static" in build_sdk.py to ANDROID_STL="c++_shared" and ran build_sdk.py again.
-To compile against libc++, I then changed ANDROID_STL="gnustl_static" in build_sdk.py to ANDROID_STL="libc++_shared" and ran build_sdk.py again.
-One unusual thing I couldn’t work out was why the static libs I built were much larger than those in the official distribution (e.g. my arm64-v8a/libopencv_core.a is 75.8MB vs 7.5MB).
-@peterchaula
-peterchaula commented on Apr 11
 @ngriffiths you need to strip out intel threading libs (TBB). That'll shave off ~15MB off your library.