Wrap gradle under cmake & build SDL3.aar

run cmake with  -DANDROID_NDK_PATH=/path/to/ndk to generate the .aar & run the gradle build

if using Android Studio you will have to run the aar script manually(or do the cmake cmd) then put the normal cmake args inside '-PcmakeArgs="-DCMAKE_BUILD_TYPE=Release ...."'  at `Settings > Build, Execution, Deployment > Gradle-Android Compiler > Command-line Options`
Check CMakeLists.txt Android build block for more info

CMakeLists.txt

@@ -55,6 +55,7 @@ cmake_dependent_option(ISLE_COMPILE_SHADERS "Compile shaders" ON "SDL_SHADERCROS
 option(CMAKE_POSITION_INDEPENDENT_CODE "Build with -fPIC" ON)
 option(ENABLE_CLANG_TIDY "Enable clang-tidy")
 option(DOWNLOAD_DEPENDENCIES "Download dependencies" ON)
+set(ANDROID_NDK_PATH "" CACHE PATH "Path to Android NDK")
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}" CACHE PATH "Directory where to put executables and dll")
 set(ISLE_EMSCRIPTEN_HOST "" CACHE STRING "Host URL for Emscripten streaming (e.g., https://test.com)")
 cmake_dependent_option(BUILD_SHARED_LIBS "Build lego1 as a shared library" ON "NOT EMSCRIPTEN" OFF)
@@ -74,47 +75,22 @@ if (DOWNLOAD_DEPENDENCIES)
   message(STATUS "Fetching SDL3 and iniparser. This might take a while...")
   include(FetchContent)
   # FIXME: properly build and source the .aar
-  if (NOT ANDROID)
+  if (WINDOWS_STORE)
-    if (WINDOWS_STORE)
+    FetchContent_Declare(
-      FetchContent_Declare(
+      SDL3
-        SDL3
+      GIT_REPOSITORY "https://github.com/Helloyunho/SDL3-uwp.git"
-        GIT_REPOSITORY "https://github.com/Helloyunho/SDL3-uwp.git"
+      GIT_TAG "main"
-        GIT_TAG "main"
+      EXCLUDE_FROM_ALL
-        EXCLUDE_FROM_ALL
+    )
-      )
-    else()
-      FetchContent_Declare(
-          SDL3
-          GIT_REPOSITORY "https://github.com/libsdl-org/SDL.git"
-          GIT_TAG "main"
-          EXCLUDE_FROM_ALL
-      )
-    endif()
-    FetchContent_MakeAvailable(SDL3)
   else()
-    find_package(SDL3 CONFIG REQUIRED)
+    FetchContent_Declare(
+      SDL3
+      GIT_REPOSITORY "https://github.com/libsdl-org/SDL.git"
+      GIT_TAG "main"
+      EXCLUDE_FROM_ALL
+    )
   endif()
-
+  FetchContent_MakeAvailable(SDL3)
-  # if(ANDROID)
-  #   FetchContent_GetProperties(SDL3)
-  #   set(SDL3_ANDROID_DIR "${sdl3_SOURCE_DIR}/android-project")
-  #
-  #   add_custom_command(
-  #     OUTPUT ${SDL3_ANDROID_DIR}/SDL/build/outputs/aar/SDL-release.aar
-  #     COMMAND ${CMAKE_COMMAND} -E echo "Building SDL3.aar via Gradle..."
-  #     COMMAND ./gradlew :SDL:assembleRelease
-  #     WORKING_DIRECTORY ${SDL3_ANDROID_DIR}
-  #     DEPENDS ${SDL3_ANDROID_DIR}/SDL/build.gradle
-  #     COMMENT "Generating SDL3.aar from SDL3 android-project"
-  #   )
-  #
-  #   add_custom_target(build_sdl3_aar ALL
-  #     DEPENDS ${SDL3_ANDROID_DIR}/SDL/build/outputs/aar/SDL-release.aar
-  #   )
-  #
-  #   # Make your native targets depend on the aar build, e.g.
-  #   # add_dependencies(your_native_target build_sdl3_aar)
-  # endif()
 
   FetchContent_Declare(
     iniparser
@@ -132,12 +108,49 @@ else()
   # find_package looks for already-installed system packages.
   # Configure with `-DCMAKE_PREFIX_PATH="/path/to/package1;/path/to/package2"`
   # to add search paths.
+  if (ANDROID)
+    message(STATUS "Please place the version-appropriate SDL3.aar in android-project/app/libs")
+  endif()
   find_package(SDL3 CONFIG REQUIRED)
 
   find_package(iniparser REQUIRED CONFIG COMPONENTS shared)
   target_link_libraries(Isle::iniparser INTERFACE iniparser-shared)
 endif()
 
+# Effectively use as a gate for running the Android build
+if (ANDROID_NDK_PATH)
+
+  FetchContent_GetProperties(SDL3)
+
+  set(SDL_ANDROID_ARCHIVE "${CMAKE_SOURCE_DIR}/android-project/app/libs/SDL3.aar")
+  add_custom_command(OUTPUT "${SDL_ANDROID_ARCHIVE}"
+    COMMAND ${Python3_EXECUTABLE} "${SDL3_SOURCE_DIR}/build-scripts/build-release.py"
+       --actions android
+       --fast
+       --android-ndk-home=${ANDROID_NDK_PATH}
+       --force
+       --root="${SDL3_SOURCE_DIR}"
+    COMMAND sh -c "cp ${sdl3_SOURCE_DIR}/build-android/SDL3-*.aar ${SDL_ANDROID_ARCHIVE}"
+    COMMENT "Generating SDL3.aar for android-project"
+  )
+
+  set(GRADLEW "${CMAKE_SOURCE_DIR}/android-project/gradlew")
+  if(CMAKE_BUILD_TYPE MATCHES "^Rel")
+    set(GRADLE_TASK "assembleRelease")
+  else()
+    set(GRADLE_TASK "assembleDebug")
+  endif()
+
+  add_custom_target(ANDROID_GRADLE_BUILD ALL
+    DEPENDS "${SDL_ANDROID_ARCHIVE}"
+    WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}/android-project"
+    COMMAND "${GRADLEW}" -i ${GRADLE_TASK} -PcmakeArgs=" -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} -DISLE_USE_DX5=${ISLE_USE_DX5} -DISLE_BUILD_CONFIG=${ISLE_BUILD_CONFIG} -DENABLE_CLANG_TIDY=${ENABLE_CLANG_TIDY} -DISLE_WERROR=${ISLE_WERROR} -DISLE_DEBUG=${ISLE_DEBUG} -Werror=dev"
+    COMMENT "Building Android APK with Gradle"
+  )
+  message(STATUS "SDL AAR")
+  return()
+endif()
+
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 if (ENABLE_CLANG_TIDY)
   find_program(CLANG_TIDY_BIN NAMES "clang-tidy" ENV "LLVM_ROOT" REQUIRED)

android-project/app/build.gradle

@@ -15,7 +15,12 @@ android {
 
         externalNativeBuild {
             cmake {
-                arguments '-DANDROID_STL=c++_shared', '-DCMAKE_BUILD_TYPE=Release', '-DISLE_USE_DX5=false', '-DISLE_BUILD_CONFIG=false', '-DENABLE_CLANG_TIDY=false', '-DISLE_WERROR=true', '-DISLE_DEBUG=false', '-Werror=dev', '-DCMAKE_MESSAGE_LOG_LEVEL=STATUS'
+                arguments '-DANDROID_STL=c++_shared'
+                if (project.hasProperty('cmakeArgs')) {
+                    project.cmakeArgs.split(" ").each {arg -> arguments arg}
+                }
+                abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+//                abiFilters 'x86_64', 'arm64-v8a'
             }
         }
     }

android-project/app/src/main/AndroidManifest.xml

@@ -41,7 +41,9 @@
             android:name="org.legoisland.isle.IsleActivity"
             android:exported="true"
             android:configChanges="layoutDirection|locale|orientation|uiMode|screenLayout|screenSize|smallestScreenSize|keyboard|keyboardHidden|navigation"
-            android:preferMinimalPostProcessing="true">
+            android:preferMinimalPostProcessing="true"
+            android:screenOrientation="landscape"
+            android:launchMode="singleInstance">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />