1Prerequisites (verified on Kubuntu 18.04.3): 2- Build kstars from source according to https://indilib.org/forum/general/210-howto-building-latest-libindi-ekos.html 3- Install Android SDK 4- Download and install NDK version android-ndk-r17c. 5- Install JDK java-8-openjdk-amd64: 6 sudo apt-get install openjdk-8-jdk 7- Install Qt open source for Android (newest version 5.13.1) under your home directory to be writable. 8- After installation of Qt, enter the correct paths to the NDK, JDK and SDK in Tools>Options>Devices>Android and make sure Qt shows no warnings regarding these paths. 9- Qt does not work with the newest SDK Tools, you must use v25 as suggested here: 10 https://stackoverflow.com/questions/42754878/qt-creator-wont-list-any-available-android-build-sdks/42811774#42811774 11 12 Basically, download https://dl.google.com/android/repository/tools_r25.2.5-linux.zip and replace the ANDROID_SDK_DIR/tools directory, 13 or just use the Android SDK download tool to use this version. 14- Some tools are needed for the compilation: sudo apt-get install dos2unix ccache subversion ant libconfig-yaml-perl 15 16Edit /etc/environment and add the following environmental variables before building: 17 PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:$ANT_HOME/bin" 18 JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64" 19 QT_ANDROID="/$HOME/Qt/5.13.1/android_armv7" 20 CMAKE_ANDROID_NDK="/$HOME/Android/Sdk/ndk/android-ndk-r17c" 21 ANDROID_NDK="/$HOME/Android/Sdk/ndk/android-ndk-r17c" 22 ANDROID_SDK_ROOT="/$HOME/Android/Sdk" 23 ANDROID_API_LEVEL=17 24 ANDROID_PLATFORM=17 25 KSTARS_ROOT="/$HOME/Projects/kstars" 26 ANT_HOME="/usr/share/ant" 27 28If you want to generate signed release package set the following variables: 29 export ANDROID_KEYSTORE=your_keystore_file 30 export ANDROID_KEYSTORE_ALIAS=your_keystore_alias 31 export KSTARS_ROOT=KStars Path (e.g. /$HOME/Projects/kstars) 32 33Configure git (if you haven't done this already): 34 git config --global user.email "you@example.com" 35 git config --global user.name "Your Name" 36 37Make a build directory in a separate location form source (e.g. /$HOME/Projects/build/kstars-android): 38 - Run build_kf5.sh and verify that the script builds everything without any problem. 39 NOTE: Ki18n often fails to build the first time, but it should succeeds when you rebuild kf5 again. 40 41 $KSTARS_ROOT/packaging/android/build_kf5.sh 42 43Configure out-of-source build (MinSizeRel build type is recommended for Android): 44 cmake -B. -H$KSTARS_ROOT -DBUILD_KSTARS_LITE=ON -DCMAKE_TOOLCHAIN_FILE=$CMAKE_ANDROID_NDK/build/cmake/android.toolchain.cmake \ 45 -DEIGEN3_INCLUDE_DIR=/usr/include/eigen3/ -DCMAKE_INSTALL_PREFIX=$(pwd)/android/export -DCMAKE_BUILD_TYPE=MinSizeRel \ 46 -DECM_DIR=/usr/share/ECM/cmake/ -DCMAKE_PREFIX_PATH=$QT_ANDROID \ 47 -DCMAKE_AR=${ANDROID_NDK}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar 48 49Compile: 50 make -j4 51 52Download and convert the translations: 53 make convert_translations_to_android 54 55Install: 56 make -j4 install 57 58Generate the Android debug package: 59 make create-apk-debug-kstars 60 61Install the Android debug package to your phone: 62 make install-apk-debug-kstars 63 64Generate the Android release package: 65 make create-apk-release-kstars 66 67To sign a release package: 68 make sign-apk-kstars 69