Merge pull request #403 from elMuso/master

Android example: Added windows.bat and updated Readme

examples/others/android/example/README.md

@@ -3,7 +3,7 @@
 To compile example to shared library you will need [Android NDK](https://developer.android.com/ndk/downloads/index.html).
 To build Android apk you will need [Android SDK](http://developer.android.com/sdk/index.html#Other).
 
-Export path to Android NDK, point to location where you have unpacked archive:
+Export path to Android NDK, point to location where you have unpacked archive (WARNING: NDK 27 is not supported . See https://github.com/raysan5/raylib/issues/4166):
 
     export ANDROID_NDK_HOME=/opt/android-ndk
 
@@ -41,3 +41,9 @@ If everything is successfully built apk can be found in the android/build/output
 
 
 For aarch64/arm64 replace `arm-linux-androideabi` with `aarch64-linux-android`, set GOARCH to arm64 and use minimum `ANDROID_API=21`.
+
+### Windows 
+
+To build shared libraries on Windows you can inspect the file `androidcompile.bat` by opening it on a text editor, it can then be configured to generate the libraries when running the .bat file
+
+See also [instructions](https://developer.android.com/build/building-cmdline#build_bundle) to build a android app bundle for appstore distribution

examples/others/android/example/androidcompile.bat

@@ -0,0 +1,68 @@
+@REM Set your desired api. Max is 31
+@set ANDROID_API=31
+@REM Your library name. If you change it here you should also change it in your android manifest...
+@set LIBRARY_NAME=example
+@REM Set your android sdk folder here
+@set ANDROID_HOME=F:/AndroidSDK 
+@REM Set your android NDK folder here. WARNING: NDK 27 is not supported yet. See https://github.com/raysan5/raylib/issues/4166
+@set ANDROID_NDK_HOME=F:/AndroidSDK/ndk/23.2.8568313
+@REM The target architecture for android. See https://developer.android.com/ndk/guides/abis. 
+@REM Valid options are: armeabi-v7a,arm64-v8a,x86,x86_64 or "all" if you want to build for all architectures.
+@set TARGET_ARCH="all"
+@REM Automatic setup. Should work by default. Do not change anything below here
+@set PATH=%ANDROID_NDK_HOME%/toolchains/llvm/prebuilt/windows-x86_64/bin;%PATH%
+@set ANDROID_SYSROOT=%ANDROID_NDK_HOME%/toolchains/llvm/prebuilt/windows-x86_64/sysroot
+@set ANDROID_TOOLCHAIN=%ANDROID_NDK_HOME%/toolchains/llvm/prebuilt/windows-x86_64
+@IF %TARGET_ARCH% == "all" (
+    @GOTO:BUILDALL
+) else (
+    @GOTO:MAIN
+)
+
+:COMPILE
+        @echo compiling for platform %FL%
+        @set CGO_CFLAGS="-I%ANDROID_SYSROOT%/usr/include -I%ANDROID_SYSROOT%/usr/include/%TRIPLE% --sysroot=%ANDROID_SYSROOT% -D__ANDROID_API__=%ANDROID_API%"
+        @set CGO_LDFLAGS="-L%ANDROID_SYSROOT%/usr/lib/%TRIPLE%/%ANDROID_API% -L%ANDROID_TOOLCHAIN%/%TRIPLE%/lib --sysroot=%ANDROID_SYSROOT%"
+        @set CGO_ENABLED=1
+        @set GOOS=android
+        @set GOARCH=arm
+        @go build -buildmode=c-shared -ldflags="-s -w -extldflags=-Wl,-soname,lib%LIBRARY_NAME%.so" -o=android/libs/%FL%/lib%LIBRARY_NAME%.so
+@EXIT /B
+
+:BUILDALL
+    @set TARGET_ARCH="armeabi-v7a"
+    @CALL:MAIN
+    @set TARGET_ARCH="arm64-v8a"
+    @CALL:MAIN
+    @set TARGET_ARCH="x86"
+    @CALL:MAIN
+    @set TARGET_ARCH="x86_64"
+    @CALL:MAIN
+@EXIT /B
+
+:MAIN
+    @IF %TARGET_ARCH% == "armeabi-v7a" (
+        @set CC="armv7a-linux-androideabi%ANDROID_API%-clang"
+        @set TRIPLE=arm-linux-androideabi
+        @set FL=armeabi-v7a
+        @set GOARCH=arm
+        @CALL:COMPILE )
+    @IF %TARGET_ARCH% == "arm64-v8a" (
+        @set CC="armv7a-linux-androideabi%ANDROID_API%-clang"
+        @set TRIPLE=aarch64-linux-android
+        @set FL=arm64-v8a
+        @set GOARCH=arm64
+        @CALL:COMPILE )
+    @IF %TARGET_ARCH% == "x86" (
+        @set CC="armv7a-linux-androideabi%ANDROID_API%-clang"
+        @set TRIPLE=i686-linux-android
+        @set FL=x86
+        @set GOARCH=arm
+        @CALL:COMPILE )
+    @IF %TARGET_ARCH% == "x86_64" (
+        @set CC="armv7a-linux-androideabi%ANDROID_API%-clang"
+        @set TRIPLE=x86_64-linux-android
+        @set FL=x86_64
+        @set GOARCH=arm64
+        @CALL:COMPILE )
+@EXIT /B