Develop Reference

How to import FreeType to my Android Studio NDK project using CMake

Hello I am beginner in Android NDK programming and I need some help getting freetype library to work with my project. I've been trying for 3 hours straight to somehow import freetype to my Android Studio project. I searched on the internet and could not find any solution that was working. I downloaded the library and put it in my cpp folder of the project.But I don't know how to include freetype. Any help would be appreaciated!
This is how my CMakeLists.txt look and for the files that I have added it works for them:
cmake_minimum_required(VERSION 3.10.2)
project("firstnative")
include_directories(stb/stb_lib
GoldFlow/Core
GoldFlow/Graphics
GoldFlow/Math
GoldFlow/glm
GoldFlow/glm/gtc
GoldFlow/entt
GoldFlow/physics
GoldFlow/scripts
GoldFlow/freetype/include
GoldFlow/freetype/include/freetype/
GoldFlow/freetype/include/freetype/config
GoldFlow/freetype/include/freetype/internal
GoldFlow/freetype/include/freetype/internal/services
)
add_library(
Native
SHARED
GoldFlow/Math/GoldMath.cpp
GoldFlow/Graphics/Shader.cpp
GoldFlow/Graphics/Renderer2D.cpp
GoldFlow/Graphics/Camera.cpp
GoldFlow/Graphics/Texture.cpp
GoldFlow/Graphics/SpriteSheet.cpp
GoldFlow/Core/Scene.cpp
GoldFlow/Core/GameObject.cpp
GoldFlow/Core/Application.cpp
GoldFlow/Core/Controls.cpp
GoldFlow/Core/Timer.cpp
GoldFlow/physics/AABB.cpp
GoldFlow/physics/Objects.cpp
GoldFlow/scripts/ControllerScript.cpp
GoldFlow/scripts/CharacterMovingScript.cpp
native.cpp)
add_library(
Freetype
SHARED
GoldFlow/freetype/src/autofit/autofit.c
GoldFlow/freetype/src/base/ftbase.c
GoldFlow/freetype/src/base/ftbbox.c
GoldFlow/freetype/src/base/ftbdf.c
GoldFlow/freetype/src/base/ftbitmap.c
GoldFlow/freetype/src/base/ftcid.c
GoldFlow/freetype/src/base/ftfstype.c
GoldFlow/freetype/src/base/ftgasp.c
GoldFlow/freetype/src/base/ftglyph.c
GoldFlow/freetype/src/base/ftgxval.c
GoldFlow/freetype/src/base/ftinit.c
GoldFlow/freetype/src/base/ftmm.c
GoldFlow/freetype/src/base/ftotval.c
GoldFlow/freetype/src/base/ftpatent.c
GoldFlow/freetype/src/base/ftpfr.c
GoldFlow/freetype/src/base/ftstroke.c
GoldFlow/freetype/src/base/ftsynth.c
GoldFlow/freetype/src/base/fttype1.c
GoldFlow/freetype/src/base/ftwinfnt.c
GoldFlow/freetype/src/bdf/bdf.c
GoldFlow/freetype/src/bzip2/ftbzip2.c
GoldFlow/freetype/src/cache/ftcache.c
GoldFlow/freetype/src/cff/cff.c
GoldFlow/freetype/src/cid/type1cid.c
GoldFlow/freetype/src/gzip/ftgzip.c
GoldFlow/freetype/src/lzw/ftlzw.c
GoldFlow/freetype/src/pcf/pcf.c
GoldFlow/freetype/src/pfr/pfr.c
GoldFlow/freetype/src/psaux/psaux.c
GoldFlow/freetype/src/pshinter/pshinter.c
GoldFlow/freetype/src/psnames/psnames.c
GoldFlow/freetype/src/raster/raster.c
GoldFlow/freetype/src/sfnt/sfnt.c
GoldFlow/freetype/src/smooth/smooth.c
GoldFlow/freetype/src/truetype/truetype.c
GoldFlow/freetype/src/type1/type1.c
GoldFlow/freetype/src/type42/type42.c
GoldFlow/freetype/src/winfonts/winfnt.c
)
find_library(
log-lib
log )
find_library(GLES-lib
GLESv3)
target_link_libraries(
Native
${log-lib}
${GLES-lib}
${Freetype}
)
The error I am getting now is this: C:\Users\infer\AndroidStudioProjects\FirstNative\app\src\main\cpp\GoldFlow\freetype\src\base\ftbdf.c:40:14: error: use of undeclared identifier 'FT_ERR_PREFIXInvalid_Face_Handle'; did you mean 'FT_Err_Invalid_Face_Handle'?

Ok the solution was very simple. All I did actually was I created directory in cpp folder named freetype and in that dir I've put every freetype file and just added that folder as sub directory in CMake and linked at the end and now eveyrthing works. Here is my CMake:
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.10.2)
# Declares and names the project.
project("firstnative")
include_directories(stb/stb_lib
GoldFlow/Core
GoldFlow/Graphics
GoldFlow/Math
GoldFlow/glm
GoldFlow/glm/gtc
GoldFlow/entt
GoldFlow/physics
GoldFlow/scripts
GoldFlow/text
)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
Native
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
GoldFlow/Math/GoldMath.cpp
GoldFlow/Graphics/Shader.cpp
GoldFlow/Graphics/Renderer2D.cpp
GoldFlow/Graphics/Camera.cpp
GoldFlow/Graphics/Texture.cpp
GoldFlow/Graphics/SpriteSheet.cpp
GoldFlow/Core/Scene.cpp
GoldFlow/Core/GameObject.cpp
GoldFlow/Core/Application.cpp
GoldFlow/Core/Controls.cpp
GoldFlow/Core/Timer.cpp
GoldFlow/physics/AABB.cpp
GoldFlow/physics/Objects.cpp
GoldFlow/scripts/ControllerScript.cpp
GoldFlow/scripts/CharacterMovingScript.cpp
GoldFlow/text/TextRenderer.cpp
native.cpp)
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
#sd
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
find_library(GLES-lib
GLESv3)
add_subdirectory(freetype)
target_link_libraries( # Specifies the target library.
Native
# Links the target library to the log and gl es library
# included in the NDK.
${log-lib}
${GLES-lib}
freetype
)

Cannot specify link libraries for target which is not built by this project

I'm following this tutorial to add firebase with C++ in my android project, I'm using CMake version 3.10.2
When I run the project, I get the following error:
Error configuring CMake server
(C:\Users\User\AppData\Local\Android\Sdk\cmake\3.10.2.4988404\bin).
Check for working C compiler:
C:/Users/User/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe
Check for working C compiler:
C:/Users/User/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe
-- works Detecting C compiler ABI info Detecting C compiler ABI info - done Detecting C compile features Detecting C compile features - done
Check for working CXX compiler:
C:/Users/User/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang++.exe
Check for working CXX compiler:
C:/Users/User/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang++.exe
-- works Detecting CXX compiler ABI info Detecting CXX compiler ABI info - done Detecting CXX compile features Detecting CXX compile
features - done Found PkgConfig:
C:/ProgramData/chocolatey/bin/pkg-config.exe (found version "0.28")
CMake Error at CMakeLists.txt:52 (target_link_libraries): Cannot
specify link libraries for target "firebase_analytics;firebase_app"
which is not built by this project.
Configuring incomplete, errors occurred!
My CMakeLists.txt file:
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
native-lib.cpp)
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log)
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
native-lib
# Links the target library to the log library
# included in the NDK.
${log-lib})
# Add Firebase libraries to the target using the function from the SDK.
add_subdirectory(${FIREBASE_CPP_SDK_DIR} bin/ EXCLUDE_FROM_ALL)
# The core Firebase library (firebase_app) is required to use any Firebase product,
# and it must always be listed last.
set(firebase_libs firebase_analytics firebase_app)
target_link_libraries(${target_name} "${firebase_libs}")

This can also be caused by not listing your library first. For example, if you have this:
add_library( my_native_code
SHARED
# Other stuff here
)
target_link_libraries(
android)
This will fail with:
Cannot specify link libraries for target "android" which is not built by this project.
You need to ensure your library is listed first:
target_link_libraries(
my_native_code
android)

I'm noticing that in this line:
target_link_libraries(${target_name} "${firebase_libs}")
The variable target_name is not defined, at least not in the CMake code you have provided. You will need to substitute the name of your target here, instead of the generic variable name used in the Firebase examples. Try this instead:
target_link_libraries(native-lib "${firebase_libs}")

How to add new source file in CMakeLists.txt?

I am creating a demo to read and write files through android NDK. I am using CMake and have CMakeLists.txt in my project with following content:
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
src/main/cpp/native-lib.cpp)
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log)
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
native-lib
# Links the target library to the log library
# included in the NDK.
${log-lib})
I have created a new utility.cpp and utility.h file in the same folder where native-lib.cpp saved. I am able to include utility.h in native-lib.cpp. When I run the program I got an error undefined reference to function {fun} where {fun} is a function written in utility.cpp.
Please suggest how can I build both the source files in my project.

Just add the cpp to your CMakeLists
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
src/main/cpp/native-lib.cpp
src/main/cpp/utility.cpp
)

Replace
src/main/cpp/native-lib.cpp)
with
src/main/cpp/utility.cpp
src/main/cpp/native-lib.cpp)
if utility is in src/main/cpp/

Android NDK Linker failure for armeabi-v7a: "PLT offset too large, try linking with --long-plt"

When trying to build a signed APK, it fails with ~100 lines repeating:
Library/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: error: PLT offset too large, try linking with --long-plt
I've added --long-plt to the arguments:
externalNativeBuild {
cmake {
...
arguments '-DANDROID_STL=c++_static', '-Wl,--long-plt'
cppFlags "-frtti -fexceptions", "-DANDROID_TOOLCHAIN=clang", "-DANDROID_STL=c++_shared"
}
}
But it doesn't seem to change anything.
It works with non-signed (debug) apk generation and works with arm64-v8a.
I'm dealing with >1GB of native code, so I'm guessing that's the main reason.
It seems there is almost no documentation or search result regarding this.
Does --long-plt need to be put somewhere else? If not, is there another setting that can be changed? Or would splitting the code into separate libraries help?
Here's the CMakeLists.txt for reference:
string(REPLACE "." "/" JAVA_GEN_SUBDIR ${JAVA_GEN_PACKAGE})
set(JAVA_GEN_DIR ${Project_SOURCE_DIR}/src/main/java/${JAVA_GEN_SUBDIR}/../../../../../generated)
# configure import libs
set(distribution_DIR ${PROJECT_SOURCE_DIR}/distribution)
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)
# Note: One could use a 'GLOB' here, but newly added source files won't auto-regen build files
# After adding files, you'd need to 'touch' the CMakeLists.txt to re-gen
# SWIG required for build. Easy install is "brew install swig"
#Site: http://swig.org
find_package(SWIG REQUIRED)
include(${SWIG_USE_FILE})
# Remove old java files, in case we don't need to generate some of them anymore
#file(REMOVE_RECURSE ${JAVA_GEN_DIR})
# Ensure file recognized as C++ (otherwise, exported as C file)
set_property(SOURCE src/main/cpp/${LIBRARY_NAME}.i PROPERTY CPLUSPLUS ON)
# Setup SWIG flags and locations
set(CMAKE_SWIG_FLAGS -c++ -package ${JAVA_GEN_PACKAGE})
set(CMAKE_SWIG_OUTDIR ${JAVA_GEN_DIR})
# Export a wrapper file to Java, and link with the created C++ library
swig_add_module(${LIBRARY_NAME}_Wrapper java ${SWIG_I_FILE})
swig_link_libraries(${LIBRARY_NAME}_Wrapper ${LIBRARY_NAME})
# Include a location to the header files
include_directories(
src/main/cpp
${NativeLibPath}
${LUAPATH}
)
set(LUAPATH ${NativeLibPath}/lua)
file(GLOB ALL_SOURCE_FILES
"src/main/cpp/*.cpp"
"${NativeLibPath}/*.cpp"
"${LUAPATH}/*.c"
)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
${LIBRARY_NAME}
# Sets the library as a shared library.
SHARED
# Provides the list of files to compile.
${ALL_SOURCE_FILES} )
target_include_directories(${LIBRARY_NAME} PRIVATE)
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries(
# Specifies the target library.
${LIBRARY_NAME}
android
# Links the target library to the log library
# included in the NDK.
${log-lib}
)

I agree there is not so much documentation on internet, even if we can find some.
First, try to modify your configuration file:
externalNativeBuild {
cmake {
...
arguments '-DANDROID_STL=c++_static'
cppFlags "-frtti -fexceptions", "-DANDROID_TOOLCHAIN=clang", "-DANDROID_STL=c++_shared", "-Wl,--long-plt"
}
}
Let me know, if it changes anything?

Android NDK Cmake Linking .a (Static) Libs

I am using Android Studio 2.2.2 with cmake and Android NDK. I have a problem linking .a library (Static lib).
Here is my cmake:
# Sets the minimum version of CMake required to build the native
# library. You should either keep the default value or only pass a
# value of 3.4.0 or lower.
cmake_minimum_required(VERSION 3.4.1)
set(CMAKE_VERBOSE_MAKEFILE on)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds it for you.
# Gradle automatically packages shared libraries with your APK.
add_library(lib_webp SHARED IMPORTED )
set_target_properties(lib_webp PROPERTIES IMPORTED_LOCATION
src/main/jni/${ANDROID_ABI}/libwebp.so)
add_library( # Sets the name of the library.
game-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
# Associated headers in the same location as their source
# file are automatically included.
src/main/cpp/main.cpp
src/main/cpp/android_native_app_glue.c
)
target_include_directories(game-lib PRIVATE
../../../../libs/headers/android
)
include_directories($ENV{NDK_MODULE_PATH}/sources/android/native_app_glue/)
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in the
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
game-lib
# Links the target library to the log library
# included in the NDK.
# ${log-lib}
# Specifies the name of the NDK library that
# you want CMake to locate.
log
android
OpenSLES
z
GLESv2
EGL
dl
)
add_definitions(-g -DANDROID -Wno-write-strings -fsigned-char -Wno-conversion-null)
TARGET_LINK_LIBRARIES(game-lib libtheoraplayer.a)
My linker reports an error
arm-linux-androideabi/bin\ld: error: cannot find -ltheoraplayer
error: undefined reference to 'TheoraVideoManager::TheoraVideoManager(int)'
which is a part of libtheoraplayer.a. Did anyone had similar problem? Any idea how to solve this?
I have the Static lib libtheoraplayer.a present at that location. I even have the Shared lib also, libtheoraplayer.so but I can`t link it either.
Any advice would be appreciated.
Cheers.

To post the answer. As Tsyvarev said, the problem with non-absolute file name for library. When I used absoulte path it worked like a charm.
Thank you.
Cheers.