Migrate Android build to gradle+CMake

.gitignore

@@ -106,6 +106,7 @@ __MACOSX
 
 # Android
 *.iml
+local.properties
 
 # libretro
 easyrpg_libretro.*

CMakeLists.txt

@@ -442,14 +442,29 @@ set_property(CACHE PLAYER_TARGET_PLATFORM PROPERTY STRINGS SDL2 libretro)
 set(PLAYER_BUILD_EXECUTABLE ON)
 set(PLAYER_TEST_LIBRARIES ${PROJECT_NAME})
 
+if(ANDROID AND PLAYER_GRADLE_BUILD)
+	# Build invoked by Gradle
+	# Ugly: Gradle has no way to branch based on the ABI
+	# Inject correct search path based on PLAYER_ANDROID_TOOLCHAIN_PATH
+	foreach(f ${PLAYER_ANDROID_TOOLCHAIN_PATH})
+		list(APPEND CMAKE_FIND_ROOT_PATH "${f}/${ANDROID_ABI}-toolchain")
+	endforeach(f)
+endif()
+
 if(${PLAYER_TARGET_PLATFORM} STREQUAL "SDL2")
 	target_sources(${PROJECT_NAME} PRIVATE
 		src/sdl2_ui.cpp
 		src/sdl2_ui.h)
 	target_compile_definitions(${PROJECT_NAME} PUBLIC USE_SDL=2)
 
 	find_package(SDL2 2.0.5 REQUIRED)
-	target_link_libraries(${PROJECT_NAME} SDL2::SDL2main)
+	if(ANDROID)
+		add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/builds/android/app/src/gamebrowser)
+		target_link_libraries(${PROJECT_NAME} SDL2::SDL2)
+		set(PLAYER_BUILD_EXECUTABLE OFF)
+	else()
+		target_link_libraries(${PROJECT_NAME} SDL2::SDL2main)
+	endif()
 elseif(${PLAYER_TARGET_PLATFORM} STREQUAL "libretro")
 	target_compile_definitions(${PROJECT_NAME} PUBLIC USE_LIBRETRO=1)
 	set(PLAYER_BUILD_EXECUTABLE OFF)
@@ -872,6 +887,13 @@ else()
 		target_link_libraries(easyrpg_libretro ${PROJECT_NAME})
 		set_target_properties(easyrpg_libretro PROPERTIES PREFIX "")
 		set(PLAYER_TEST_LIBRARIES "easyrpg_libretro")
+	elseif(ANDROID AND ${PLAYER_TARGET_PLATFORM} STREQUAL "SDL2")
+		add_library(easyrpg_android
+			src/platform/android/org_easyrpg_player_player_EasyRpgPlayerActivity.cpp
+			src/platform/android/org_easyrpg_player_player_EasyRpgPlayerActivity.h
+			src/main.cpp)
+		target_link_libraries(easyrpg_android ${PROJECT_NAME})
+		set(PLAYER_TEST_LIBRARIES "easyrpg_android")
 	else()
 		message(FATAL_ERROR "Unsupported library target platform ${PLAYER_TARGET_PLATFORM}")
 	endif()

README.md

@@ -62,6 +62,15 @@ https://easyrpg.org/downloads/player/
 
 ## Building
 
+### Dependencies:
+
+If your operating system has a package manager, we recommend installing the
+dependencies with it.
+
+In case you want to compile the dependencies yourself, you can find them,
+except for [liblcf], in our [buildscripts] repository.
+
+
 ### Autotools Makefile method:
 
 Building requirements:
@@ -113,6 +122,7 @@ https://wiki.easyrpg.org/development/compiling/player/cmake
 CMake is the only supported way to build Player for Windows. All dependencies
 must be installed with [vcpkg].
 
+
 ### Building a libretro core:
 
 Building for libretro is based on the CMake method.
@@ -130,6 +140,30 @@ Set shared libs to ON or OFF depending on which type of libraries RetroArch
 uses on the platform you are targeting.
 
 
+### Building an Android APK:
+
+Building requirements:
+
+- Android SDK with NDK r21
+
+Step-by-step instructions:
+
+    tar xf easyrpg-player-0.6.2.tar.xz     # unpack the tarball
+    cd easyrpg-player-0.6.2/builds/android # enter in the android directory
+    ./gradlew -PtoolchainDirs="DIR1;DIR2" assembleRelease # create the APK
+
+Replace ``DIR1`` etc. with the path to the player dependencies. You can use
+the scripts in the ``android`` folder of our [buildscripts] to compile them.
+
+To pass additional CMake arguments use ``-PcmakeOptions``:
+
+    -PcmakeOptions="-DSOME_OPTION1=ON -DSOME_OPTION2=OFF"
+
+The unsigned APK is stored in:
+
+    app/build/outputs/apk/release/app-release-unsigned.apk
+
+
 ## Running EasyRPG Player
 
 Run the `easyrpg-player` executable from a RPG Maker 2000 or 2003 game
@@ -166,6 +200,7 @@ EasyRPG Player makes use of the following 3rd party software:
 
 * [Teenyicons] - Copyright (c) 2020 Anja van Staden, provided under the MIT license
 
+[buildscripts]: https://github.com/EasyRPG/buildscripts
 [liblcf]: https://github.com/EasyRPG/liblcf
 [vcpkg]: https://github.com/Microsoft/vcpkg
 [#easyrpg at irc.freenode.net]: https://kiwiirc.com/nextclient/#ircs://irc.freenode.net/#easyrpg?nick=rpgguest??

builds/android/app/.gitignore

@@ -0,0 +1 @@
+.cxx/

builds/android/app/build.gradle

@@ -1,31 +1,58 @@
 apply plugin: 'com.android.application'
 android {
     compileSdkVersion 29
-    buildToolsVersion '29.0.2'
+    buildToolsVersion '29.0.3'
+    ndkVersion '21.4.7075529'
     defaultConfig {
         applicationId "org.easyrpg.player"
         minSdkVersion 14
         targetSdkVersion 29
+        versionName VERSION_NAME
+        versionCode Integer.parseInt(VERSION_CODE)
     }
     buildTypes {
+        debug {
+            ndk {
+                abiFilters = []
+                abiFilters.addAll(ABI_FILTERS_DEBUG.split(','))
+            }
+        }
         release {
+            ndk {
+                abiFilters = []
+                abiFilters.addAll(ABI_FILTERS_RELEASE.split(','))
+            }
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
         }
     }
-    android {
-        sourceSets {
-            main {
-                jni.srcDirs = []
+    externalNativeBuild {
+        cmake {
+            path "../../../CMakeLists.txt"
+            version "3.10.2"
+        }
+    }
+    defaultConfig {
+        externalNativeBuild {
+            cmake {
+                arguments "-DPLAYER_GRADLE_BUILD=ON",
+                        "-DBUILD_SHARED_LIBS=ON",
+                        "-DPLAYER_ENABLE_TESTS=OFF"
+
+                if (project.hasProperty("toolchainDirs")) {
+                    arguments.add('-DPLAYER_ANDROID_TOOLCHAIN_PATH=' + project.properties['toolchainDirs'])
+                }
+
+                if (project.hasProperty("cmakeOptions")) {
+                    arguments.addAll(project.properties['cmakeOptions'].split(" "))
+                }
             }
         }
     }
     lintOptions {
         disable 'MissingTranslation'
         abortOnError false
     }
-    productFlavors {
-    }
 }
 
 allprojects {
@@ -37,8 +64,8 @@ allprojects {
 }
 
 dependencies {
-    implementation 'androidx.appcompat:appcompat:1.1.0'
-    implementation 'com.google.android.material:material:1.1.0'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.3.0'
     implementation 'androidx.cardview:cardview:1.0.0'
     implementation 'androidx.recyclerview:recyclerview:1.1.0'
 }

builds/android/app/src/gamebrowser/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.7)
+
+project(easyrpg_android VERSION 1.0 LANGUAGES CXX)
+
+add_library(gamebrowser
+	org_easyrpg_player_game_browser_GameScanner.cpp
+	org_easyrpg_player_game_browser_GameScanner.h
+)
+
+find_package(PNG REQUIRED)
+target_link_libraries(gamebrowser PNG::PNG)
+
+if(BUILD_SHARED_LIBS)
+	set_property(TARGET gamebrowser PROPERTY POSITION_INDEPENDENT_CODE ON)
+endif()

builds/android/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -172,7 +172,7 @@ protected String[] getLibraries() {
             // "SDL2_mixer",
             // "SDL2_net",
             // "SDL2_ttf",
-            "main"
+            "easyrpg_android"
         };
     }