Android: Updated the toolchain file and CMake scripts

* Replaced the toolchain file with a new version based on [zuhowei's fork](https://github.com/zhuowei/android-cmake), which enables x64 builds as well as support for the latest NDK. This breaks compatibility with old build directories.
* Removed the STL dependency from **sfml-activity** rather than relying on *some* implementation implicitly linked by default.
* Deleted *project.properties*, which wasn't supposed to be part of the repository code. You have to use the Android SDK to recreate it (`android update project --path to/your/example --target 1 --name SFML-Example`).
* Made it possible to select a STL implementation to be used (default: `c++_shared`). Keep in mind that not all available configurations are necessarily compatible with SFML.
* Fixed linker flags to be compatible with Nvidia's Nsight Tegra for Visual Studio.
* It is now possible to compile the Android version using Nvidia's Nsight Tegra for Visual Studio (requires up-to-date CMake and `CMAKE_SFML_SYSTEM` to be set to `Android`; keep in mind that this is still experimental and requires further CMake updates).
* Updated and renamed some Android specific CMake variables.
* Made `armeabi-v7a` the default ABI for Android builds.

.gitattributes

@@ -1,6 +1,7 @@
 * text=auto eol=lf
 
 extlibs/**/* -text -eol linguist-vendored
+cmake/toolchains/android.toolchain.cmake -text -eol
 
 *.png -text -eol
 *.jpg -text -eol

CMakeLists.txt

@@ -8,10 +8,29 @@ macro(sfml_set_option var default type docstring)
     set(${var} ${${var}} CACHE ${type} ${docstring} FORCE)
 endmacro()
 
-# set a default build type if none was provided
-# this has to be done before the project() instruction!
+# these options have to be set before CMake detects/configures the toolchain
+
+# determine whether to create a debug or release build
 sfml_set_option(CMAKE_BUILD_TYPE Release STRING "Choose the type of build (Debug or Release)")
 
+# set Android specific options
+
+# define the minimum API level to be used
+sfml_set_option(ANDROID_API_MIN 9 STRING "Choose the Android API level to be used (minimum 9)")
+# mirror the setting for the toolchain file
+set(ANDROID_NATIVE_API_LEVEL ${ANDROID_API_MIN})
+
+# define the path to the Android NDK
+sfml_set_option(ANDROID_NDK "$ENV{ANDROID_NDK}" PATH "Path to the Android NDK")
+
+# define the STL implementation to be used
+sfml_set_option(ANDROID_STL c++_shared STRING "Choose the STL implementation to be used (experimental)")
+
+# default the ABI to ARM v7a for hardware floating point
+if(NOT ANDROID_ABI)
+    set(ANDROID_ABI armeabi-v7a)
+endif()
+
 # project name
 project(SFML)
 
@@ -64,24 +83,41 @@ endif()
 
 # Android options
 if(SFML_OS_ANDROID)
-    # force usage of the STL port
-    set(ANDROID_USE_STLPORT TRUE)
-
     # make sure there's the android library available
-    if (${ANDROID_NATIVE_API_LEVEL} LESS 9)
-        message(FATAL_ERROR "API level must be equal or greater than 9")
+    if (${ANDROID_API_MIN} LESS 9)
+        message(FATAL_ERROR "Android API level must be equal or greater than 9. Please adjust the CMake variable 'ANDROID_API_MIN'.")
     endif()
 
+    if(NOT ANDROID_NDK)
+        message(FATAL_ERROR "The Android NDK couldn't be found. Please adjust the CMake variable 'ANDROID_NDK' to point to the NDK directory.")
+    endif()
+    
+    # CMake doesn't support defining the STL to be used with Nsight Tegra, so warn the user
+    if(CMAKE_VS_PLATFORM_NAME STREQUAL "Tegra-Android")
+        message(WARNING "CMake might not properly support setting the STL. Make sure to adjust all generated library projects!")
+    endif()
+    
     # install everything in $NDK/sources/ because this path is appended by the NDK (convenient)
     set(CMAKE_INSTALL_PREFIX ${ANDROID_NDK}/sources/sfml)
 
     # we install libs in a subdirectory named after the ABI (lib/mips/*.so)
     set(LIB_SUFFIX "/${ANDROID_ABI}")
 
-    # this is a workaround to compile sfml-activity without stlport_shared as dependency
+    # pass shared STL configuration (if any)
+    if (ANDROID_STL MATCHES "_shared")
+        add_definitions("-DSTL_LIBRARY=${ANDROID_STL}")
+    endif()
+    
+    # this is a workaround to compile sfml-activity without the stl library as a dependency
     # we save the original compilation command line to restore it later in Macro.cmake
-    set(CMAKE_CXX_CREATE_SHARED_LIBRARY_WITH_STLPORT ${CMAKE_CXX_CREATE_SHARED_LIBRARY})
-    set(CMAKE_CXX_CREATE_SHARED_LIBRARY_WITHOUT_STLPORT "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
+    set(CMAKE_CXX_CREATE_SHARED_LIBRARY_WITH_STL ${CMAKE_CXX_CREATE_SHARED_LIBRARY})
+    set(CMAKE_CXX_CREATE_SHARED_LIBRARY_WITHOUT_STL "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
+else()
+    unset(ANDROID_ABI CACHE)
+    unset(ANDROID_API_MIN CACHE)
+    unset(ANDROID_STL CACHE)
+    unset(ANDROID_NATIVE_API_LEVEL CACHE)
+    unset(ANDROID_NDK CACHE)
 endif()
 
 # define SFML_STATIC if the build type is not set to 'shared'

cmake/Config.cmake

@@ -60,7 +60,7 @@ elseif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
         endif()
     endif()
 elseif(${CMAKE_SYSTEM_NAME} MATCHES "Android")
-	set(SFML_OS_ANDROID 1)
+    set(SFML_OS_ANDROID 1)
 
     # use the OpenGL ES implementation on Android
     set(OPENGL_ES 1)

cmake/Macros.cmake

@@ -98,9 +98,9 @@ macro(sfml_add_library target)
         if (${target} MATCHES "sfml-activity")
             set_target_properties(${target} PROPERTIES COMPILE_FLAGS -fpermissive)
             set_target_properties(${target} PROPERTIES LINK_FLAGS "-landroid -llog")
-            set(CMAKE_CXX_CREATE_SHARED_LIBRARY ${CMAKE_CXX_CREATE_SHARED_LIBRARY_WITHOUT_STLPORT})
+            set(CMAKE_CXX_CREATE_SHARED_LIBRARY ${CMAKE_CXX_CREATE_SHARED_LIBRARY_WITHOUT_STL})
         else()
-            set(CMAKE_CXX_CREATE_SHARED_LIBRARY ${CMAKE_CXX_CREATE_SHARED_LIBRARY_WITH_STLPORT})
+            set(CMAKE_CXX_CREATE_SHARED_LIBRARY ${CMAKE_CXX_CREATE_SHARED_LIBRARY_WITH_STL})
         endif()
     endif()
 
@@ -176,3 +176,28 @@ macro(sfml_add_example target)
     endif()
 
 endmacro()
+
+# macro to find packages on the host OS
+# this is the same as in the toolchain file, which is here for Nsight Tegra VS
+# since it won't use the Android toolchain file
+if(CMAKE_VS_PLATFORM_NAME STREQUAL "Tegra-Android")
+    macro(find_host_package)
+        set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+        set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER)
+        set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER)
+        if(CMAKE_HOST_WIN32)
+            set(WIN32 1)
+            set(UNIX)
+        elseif(CMAKE_HOST_APPLE)
+            set(APPLE 1)
+            set(UNIX)
+        endif()
+        find_package(${ARGN})
+        set(WIN32)
+        set(APPLE)
+        set(UNIX 1)
+        set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
+        set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+        set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+    endmacro()
+endif()

examples/android/jni/Application.mk

@@ -1,5 +1,5 @@
 NDK_TOOLCHAIN_VERSION := 4.8
 APP_PLATFORM := android-9
 APP_STL := c++_shared
-APP_ABI := armeabi
+APP_ABI := armeabi-v7a
 APP_MODULES := sfml-activity sfml-example

examples/android/project.properties

@@ -1 +0,0 @@
-target=android-19

src/SFML/Audio/CMakeLists.txt

@@ -56,7 +56,7 @@ include_directories(${OPENAL_INCLUDE_DIR} ${SNDFILE_INCLUDE_DIR})
 
 # build the list of external libraries to link
 if(SFML_OS_ANDROID)
-    list(APPEND AUDIO_EXT_LIBS -landroid -lOpenSLES)
+    list(APPEND AUDIO_EXT_LIBS android OpenSLES)
 endif()
 list(APPEND AUDIO_EXT_LIBS ${OPENAL_LIBRARY} ${SNDFILE_LIBRARY})
 

src/SFML/Graphics/CMakeLists.txt

@@ -138,7 +138,7 @@ endif()
 if(SFML_OS_IOS)
     list(APPEND GRAPHICS_EXT_LIBS "-framework OpenGLES")
 elseif(SFML_OS_ANDROID)
-    list(APPEND GRAPHICS_EXT_LIBS -lz)
+    list(APPEND GRAPHICS_EXT_LIBS z)
 endif()
 list(APPEND GRAPHICS_EXT_LIBS ${FREETYPE_LIBRARY} ${JPEG_LIBRARY})
 

src/SFML/Main/SFMLActivity.cpp

@@ -23,7 +23,6 @@
 ////////////////////////////////////////////////////////////
 
 #include <SFML/Config.hpp>
-#include <string>
 #include <android/native_activity.h>
 #include <android/log.h>
 #include <dlfcn.h>
@@ -37,13 +36,14 @@ namespace {
     typedef void (*activityOnCreatePointer)(ANativeActivity*, void*, size_t);
 }
 
-std::string getLibraryName(JNIEnv* lJNIEnv, jobject& objectActivityInfo)
+const char *getLibraryName(JNIEnv* lJNIEnv, jobject& objectActivityInfo)
 {
     // This function reads the value of meta-data "sfml.app.lib_name"
     // found in the Android Manifest file and returns it. It performs the
     // following Java code using the JNI interface:
     //
     // ai.metaData.getString("sfml.app.lib_name");
+    static char name[256];
 
     // Get metaData instance from the ActivityInfo object
     jclass classActivityInfo = lJNIEnv->FindClass("android/content/pm/ActivityInfo");
@@ -58,7 +58,7 @@ std::string getLibraryName(JNIEnv* lJNIEnv, jobject& objectActivityInfo)
     jmethodID methodGetString = lJNIEnv->GetMethodID(classBundle, "getString", "(Ljava/lang/String;)Ljava/lang/String;");
     jstring valueString = (jstring)lJNIEnv->CallObjectMethod(objectMetaData, methodGetString, objectName);
 
-    // No meta-data "sfml.app.lib_name" was found so we abord and inform the user
+    // No meta-data "sfml.app.lib_name" was found so we abort and inform the user
     if (valueString == NULL)
     {
         LOGE("No meta-data 'sfml.app.lib_name' found in AndroidManifest.xml file");
@@ -68,10 +68,18 @@ std::string getLibraryName(JNIEnv* lJNIEnv, jobject& objectActivityInfo)
     // Convert the application name to a C++ string and return it
     const jsize applicationNameLength = lJNIEnv->GetStringUTFLength(valueString);
     const char* applicationName = lJNIEnv->GetStringUTFChars(valueString, NULL);
-    std::string ret(applicationName, applicationNameLength);
+    
+    if (applicationNameLength >= 256)
+    {
+        LOGE("The value of 'sfml.app.lib_name' must not be longer than 255 characters.");
+        exit(1);
+    }
+    
+    strncpy(name, applicationName, applicationNameLength);
+    name[applicationNameLength] = '\0';
     lJNIEnv->ReleaseStringUTFChars(valueString, applicationName);
 
-    return ret;
+    return name;
 }
 
 void* loadLibrary(const char* libraryName, JNIEnv* lJNIEnv, jobject& ObjectActivityInfo)
@@ -159,7 +167,13 @@ void ANativeActivity_onCreate(ANativeActivity* activity, void* savedState, size_
     jobject ObjectActivityInfo = lJNIEnv->CallObjectMethod(ObjectPackageManager, MethodGetActivityInfo, ObjectComponentName, GET_META_DATA);
 
     // Load our libraries in reverse order
-    loadLibrary("c++_shared", lJNIEnv, ObjectActivityInfo);
+#if defined(STL_LIBRARY)
+#define _SFML_QS(s) _SFML_S(s)
+#define _SFML_S(s) #s
+    loadLibrary(_SFML_QS(STL_LIBRARY), lJNIEnv, ObjectActivityInfo);
+#undef _SFML_S
+#undef _SFML_QS
+#endif
     loadLibrary("sndfile", lJNIEnv, ObjectActivityInfo);
     loadLibrary("openal", lJNIEnv, ObjectActivityInfo);
 
@@ -177,8 +191,7 @@ void ANativeActivity_onCreate(ANativeActivity* activity, void* savedState, size_
     loadLibrary("sfml-network-d", lJNIEnv, ObjectActivityInfo);
 #endif
 
-    std::string libName = getLibraryName(lJNIEnv, ObjectActivityInfo);
-    void* handle = loadLibrary(libName.c_str(), lJNIEnv, ObjectActivityInfo);
+    void* handle = loadLibrary(getLibraryName(lJNIEnv, ObjectActivityInfo), lJNIEnv, ObjectActivityInfo);
 
     // Call the original ANativeActivity_onCreate function
     activityOnCreatePointer ANativeActivity_onCreate = (activityOnCreatePointer)dlsym(handle, "ANativeActivity_onCreate");

src/SFML/Window/CMakeLists.txt

@@ -227,7 +227,7 @@ elseif(SFML_OS_MACOSX)
 elseif(SFML_OS_IOS)
     list(APPEND WINDOW_EXT_LIBS "-framework Foundation -framework UIKit -framework CoreGraphics -framework QuartzCore -framework CoreMotion")
 elseif(SFML_OS_ANDROID)
-    list(APPEND WINDOW_EXT_LIBS "-landroid")
+    list(APPEND WINDOW_EXT_LIBS android)
 endif()
 if(SFML_OPENGL_ES)
     if(SFML_OS_LINUX)
@@ -235,7 +235,7 @@ if(SFML_OPENGL_ES)
     elseif(SFML_OS_IOS)
         list(APPEND WINDOW_EXT_LIBS "-framework OpenGLES")
     elseif(SFML_OS_ANDROID)
-        list(APPEND WINDOW_EXT_LIBS "-lEGL -lGLESv1_CM")
+        list(APPEND WINDOW_EXT_LIBS EGL GLESv1_CM)
     endif()
 else()
     list(APPEND WINDOW_EXT_LIBS ${OPENGL_gl_LIBRARY})