D on android and d_android

[Jan Hönig]

On Tuesday, 7 April 2020 at 14:51:15 UTC, H. S. Teoh wrote:
> On Tue, Apr 07, 2020 at 12:43:20PM +0000, Adam D. Ruppe via 
> Digitalmars-d-learn wrote:
>> On Monday, 6 April 2020 at 08:38:03 UTC, Jan Hönig wrote:
>> > Is there some "Hello World!" example for D on Android?
> [...]
>> > However there is just so much to know.
>> > It is really overwhelming.
>> 
>> no kidding, I spent several weekends just trying to understand 
>> the setup and build process. And I still basically don't 
>> really know, which is why my thing there builds the D code 
>> externally and copies the files where gradle can find them 
>> instead of actually changing the gradle config.
>
> I managed to build APKs without Gradle (yes, I'm crazy like 
> that). There are several steps, and you do need some tools from 
> the Android SDK/NDK, namely aapt, apksigner, dx (called 
> dalvik-exchange on some distros), zipalign, and a Java 1.7 
> compiler (the last time I checked; maybe they support 1.8 now, 
> I don't know).
>
> I haven't tried a native app so far, so the way I set it up is 
> to create a dummy Java wrapper that contains main() that calls 
> native methods that are implemented in D.  You can use Adam's 
> jni.d to generate implementations for your native methods.
>
> Steps:
>
> 1) Follow LDC wiki to build an Android cross-compiler and 
> cross-compiled
>    LDC libraries (this may already be prepackaged with the 
> latest LDC
>    releases). Most important thing you need is the path to the 
> droid32
>    or droid64 directories containing the libraries 
> libdruntime-ldc.a,
>    libphobos2-ldc.a, libdruntime-ldc-debug.a, 
> libphobos2-ldc-debug.a.
>
> 	DROID32_PATH=/usr/src/d/android/droid32/lib	# for example
>
> 2) Generate R.java:
>
> 	TARGET_API_LEVEL=23 # for example
> 	/usr/bin/aapt package -f -m -M AndroidManifest.xml -S res -I 
> ${PATH_TO_ANDROID_SDK}/platforms/android-${TARGET_API_LEVEL}/android.jar -J ${PATH_TO_JAVA_SOURCE_CODE}
>
> 3) Compile Java sources:
>
> 	/usr/bin/javac -source 1.7 -target 1.7 -bootclasspath 
> ${PATH_TO_ANDROID_SDK}/platforms/android-${TARGET_API_LEVEL}/android.jar -d obj -sourcepath src ${JAVA_SOURCE_FILES (including R.java)}
>
> 4) Generate classes.dex (on some systems dalvik-exchange might 
> be called
> simply 'dx'):
>
> 	/usr/bin/dalvik-exchange --dex --output=classes.dex 
> ${PATH_TO_OBJ_DIR}
>
> 5) Setup linker config file (for optimizing apk size):
>
> 	LINKER_VERSION_FILE=lib${YOUR_APP_NAME}.version
> 	cat > $LINKER_VERSION_FILE
> 	LIBGAME_1.0 {
> 		global:
> 			Java_*;
> 		local:
> 			*;
> 	};
>
> 6) Cross-compile D code with LDC:
>
> 	${PATH_TO_LDC}/bin/ldmd2 -c 
> -mtriple=armv7-none-linux-androideabi -mcpu=cortex-a8 
> -L-L${DROID32_PATH}/lib -Xcc=-fpie -Xcc=-pie 
> -Xcc=--sysroot=${PATH_TO_ANDROID_NDK}/platforms/android-${TARGET_API_LEVEL}/arch-arm -Xcc=-fuse-ld=bfd -Xcc=-gcc-toolchain -Xcc=${PATH_TO_ANDROID_NDK}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 -Xcc=-target -Xcc=armv7-none-linux-androideabi -O4 -inline -Isrc/d -od${PATH_TO_OBJ_DIR} ${D_SOURCE_FILES}
> 	${PATH_TO_ANDROID_NDK}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -Wl,-soname,lib${YOUR_APP_NAME}.so -shared -Wl,--gc-sections -Wl,--version-script=${LINKER_VERSION_FILE} -llog -landroid -lEGL -lGLESv2 --sysroot=${PATH_TO_ANDROID_NDK}/platforms/android-${TARGET_API_LEVEL}/arch-arm -fuse-ld=bfd -gcc-toolchain ${PATH_TO_ANDROID_NDK}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 -target armv7-none-linux-androideabi ${D_OBJECT_FILES} ${DROID32_PATH}/lib/libphobos2-ldc.a ${DROID32_PATH}/lib/libdruntime-ldc.a -o lib/armeabi-v7a/lib${YOUR_APP_NAME}.so
>
> 7) Create unaligned APK:
> 	/usr/bin/aapt package -f -m -M AndroidManifest.xml -S res -I 
> ${PATH_TO_ANDROID_SDK}/platforms/android-${TARGET_API_LEVEL}/android.jar -F bin/${YOUR_APP_NAME}.unaligned.apk
> 	/usr/bin/aapt add bin/${YOUR_APP_NAME}.unaligned.apk 
> classes.dex
> 	/usr/bin/aapt add bin/${YOUR_APP_NAME}.unaligned.apk 
> lib/armeabi-v7a/lib${YOUR_APP_NAME}.so
>
> 8) Sign the APK:
> 	/usr/bin/apksigner sign --ks-pass 
> file:${YOUR_SIGNING_KEY_PASSWORD_FILE} --ks 
> ${YOUR_SIGNING_KEY_STORE_FILE} 
> bin/${YOUR_APP_NAME}.unaligned.apk
>
> 9) Align the APK:
> 	/usr/bin/zipalign -f 4 bin/${YOUR_APP_NAME}.unaligned.apk 
> bin/${YOUR_APP_NAME}.apk
>
> 10) Copy bin/${YOUR_APP_NAME}.apk to your device and install it.
>
>
> T

Thanks for the effort. I will try the "easy" way frist :D