I would like to create a QT widget (C++) and use the OpenCV library (C++) and deploy it to Android.
I have installed QT for Android and the necessary files mentioned in http://qt-project.org/doc/qt-5/androidgs.html such as the NDK,SDK etc. The mingw compiler is included in QT for Android so I didnt have to install this again.
I have no problem deploying a QT widget to android. The problem is using the OpenCV library in the QT widget and then deploying it.
I have tried two options to use OpenCV in my QT project:
As QT for Android comes with the mingw compiler I have compiled the OpenCV library from source using CMake and the mingw compiler. Then i have included the header files and linked the libraries in the project file of QT . This option does not work . I am used to this method of including and would also like to use other libraries such as Boost and Eigen in the same way.
I have downloaded the OPENCV android SDK and included it's header files and linked it's libraries in the project file of QT. This still hasnt worked.
Basically all I want to do is solely code in C++, hence using a widget and not qtquick(qml). Please can you let me know which ,if any, of the above steps is correct and what changes I have to make.
On another note does anyone know how I can speed up the emulator , I have an AMD processor so cant take advantage of intels tools. And where I can get the AVD settings for Samsung Note 4?
Thanks very much!!
Project file for option 1:
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = test3
TEMPLATE = app
LIBS+= C:\programs\opencv\RELEASE\lib\\\*
INCLUDEPATH+= C:\programs\opencv\RELEASE\install\include\
SOURCES += main.cpp\
mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui
CONFIG += mobility
MOBILITY =
Errors for option 1:
12:18:17: Starting: "C:\programs\QT\Tools\mingw482_32\bin\mingw32-make.exe"
C:\programs\QT\5.3\android_armv7\bin\qmake.exe -spec android-g++ CONFIG+=debug -o Makefile ..\test3\test3.pro
The system cannot find the path specified.
C:\programs\android-ndk-r10c/toolchains/arm-linux-androideabi-4.9/prebuilt/windows/bin/arm-linux-androideabi-g++ --sysroot=C:\programs\android-ndk-r10c/platforms/android-9/arch-arm/ -Wl,-soname,libtest3.so -Wl,--no-undefined -Wl,-z,noexecstack -shared -o libtest3.so main.obj mainwindow.obj moc_mainwindow.obj -LC:\programs\android-ndk-r10c/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a -LC:\programs\android-ndk-r10c/platforms/android-9/arch-arm//usr/lib C:\programs\opencv\RELEASE\lib\\* -LC:/programs/QT/5.3/android_armv7/lib -lQt5Widgets -Lc:\Utils\android\ndk/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi-v7a -Lc:\Utils\android\ndk/platforms/android-9/arch-arm//usr/lib -LC:\Utils\icu32_51_1_mingw482\lib -LC:\utils\postgresql\pgsql\lib -LC:\utils\mysql\mysql\lib -LC:\Utils\pgsql\lib -LC:\temp\opensll-android-master\openssl-android-master\lib -LC:\programs\QT\5.3\android_armv7/lib -lQt5Gui -lQt5Core -lGLESv2 -lgnustl_shared -llog -lz -lm -ldl -lc -lgcc
..\..\opencv\RELEASE\install\include/opencv2/core/mat.hpp:278: error: undefined reference to 'cv::fastFree(void*)'
..\..\opencv\RELEASE\install\include/opencv2/core/mat.hpp:298: error: undefined reference to 'cv::Mat::copySize(cv::Mat const&)'
..\..\opencv\RELEASE\install\include/opencv2/core/mat.hpp:367: error: undefined reference to 'cv::Mat::deallocate()'
..\test3/main.cpp:23: error: undefined reference to 'cv::imread(std::string const&, int)'
..\test3/main.cpp:31: error: undefined reference to 'cv::namedWindow(std::string const&, int)'
..\test3/main.cpp:32: error: undefined reference to 'cv::_InputArray::_InputArray(cv::Mat const&)'
Makefile:82: recipe for target 'libtest3.so' failed
..\test3/main.cpp:32: error: undefined reference to 'cv::imshow(std::string const&, cv::_InputArray const&)'
..\test3/main.cpp:34: error: undefined reference to 'cv::waitKey(int)'
collect2.exe: error: ld returned 1 exit status
mingw32-make: *** [libtest3.so] Error 1
12:18:22: The process "C:\programs\QT\Tools\mingw482_32\bin\mingw32-make.exe" exited with code 2.
Error while building/deploying project test3 (kit: Android for armeabi-v7a (GCC 4.9, Qt 5.3.2))
When executing step "Make"
12:18:22: Elapsed time: 00:04.
Project file for option 2:
#-------------------------------------------------
#
# Project created by QtCreator 2014-12-05T18:06:24
#
#-------------------------------------------------
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = test3
TEMPLATE = app
INCLUDEPATH+= C:\programs\opencvandroidsdk\sdk\native\jni\include
LIBS += -LC:\programs\opencvandroidsdk\sdk\native\libs\armeabi-v7a\
-lopencv_contrib \
-lopencv_legacy \
-lopencv_ml \
-lopencv_objdetect \
-lopencv_calib3d \
-lopencv_video \
-lopencv_features2d \
-lopencv_highgui \
-lopencv_androidcamera \
-lopencv_flann \
-lopencv_imgproc \
-lopencv_core
LIBS += -LC:\programs\opencvandroidsdk\sdk\native\3rdparty\libs\armeabi-v7a\
-llibjpeg \
-llibpng \
-llibtiff \
-llibjasper \
-ltbb \
-lIlmImf
SOURCES += main.cpp\
mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui
CONFIG += mobility
MOBILITY =
Errors for option 2:
18:24:53: Running steps for project test3...
18:24:53: Configuration unchanged, skipping qmake step.
18:24:53: Starting: "C:\programs\QT\Tools\mingw482_32\bin\mingw32-make.exe"
mingw32-make: Nothing to be done for 'first'.
18:24:55: The process "C:\programs\QT\Tools\mingw482_32\bin\mingw32-make.exe" exited normally.
18:24:55: Starting: "C:\programs\QT\Tools\mingw482_32\bin\mingw32-make.exe" INSTALL_ROOT="C:\programs\QT projects\build-test3-Android_for_armeabi_v7a_GCC_4_9_Qt_5_3_2-Release\android-build" install
copy /y "libtest3.so" "C:\programs\QT projects\build-test3-Android_for_armeabi_v7a_GCC_4_9_Qt_5_3_2-Release\android-build\libs\armeabi-v7a\libtest3.so"
The system cannot find the path specified.
0 file(s) copied.
Makefile:1627: recipe for target 'install_target' failed
mingw32-make: [install_target] Error 1 (ignored)
18:24:57: The process "C:\programs\QT\Tools\mingw482_32\bin\mingw32-make.exe" exited normally.
Error while building/deploying project test3 (kit: Android for armeabi-v7a (GCC 4.9, Qt 5.3.2))
When executing step "Deploy to Android device"
18:27:00: Elapsed time: 02:07.
