Add wrapper script to set up Android build

This then runs the script under packaging/android.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

scripts/android-build.sh

@@ -0,0 +1,113 @@
+#!/bin/bash
+
+# run this in the top level folder you want to create Android binaries in
+#
+# it seems that with Qt5.7.1 and current cmake there is an odd bug where
+# cmake fails reporting :No known features for CXX compiler "GNU". In that
+# case simly comment out the "set(property(TARGET Qt5::Core PROPERTY...)"
+# at line 101 of
+# Qt/5.7/android_armv7/lib/cmake/Qt5Core/Qt5CoreConfigExtras.cmake
+
+exec 1> >(tee ./build.log) 2>&1
+
+USE_X=`case "$-" in *x*) echo "-x" ;; esac`
+
+# these are the current versions for Qt, Android SDK & NDK:
+
+QT_VERSION=5.7
+LATEST_QT=5.7.1
+NDK_VERSION=r13b
+SDK_VERSION=r25.2.3
+
+ANDROID_NDK=android-ndk-${NDK_VERSION}
+ANDROID_SDK=android-sdk-linux
+
+PLATFORM=$(uname)
+
+if [ "$PLATFORM" = "Linux" ] ; then
+	QT_BINARIES=qt-opensource-linux-x64-android-${LATEST_QT}.run
+	NDK_BINARIES=${ANDROID_NDK}-linux-x86_64.zip
+	SDK_TOOLS=tools_${SDK_VERSION}-linux.zip
+else
+	echo "only on Linux so far"
+	exit 1
+fi
+
+# download the Qt installer including Android bits and unpack / install
+QT_DOWNLOAD_URL=https://download.qt.io/archive/qt/${QT_VERSION}/${LATEST_QT}/${QT_BINARIES}
+if [ ! -f ${QT_BINARIES} ] ; then
+	wget ${QT_DOWNLOAD_URL}
+	echo "In the binary installer select $(pwd)/${LATEST_QT} as install directory"
+	bash ./${QT_BINARIES}
+fi
+
+[ -e Qt ] || ln -s Qt${LATEST_QT} Qt
+
+# next we need to get the Android SDK and NDK
+if [ ! -d $ANDROID_NDK ] ; then
+	if [ ! -f $NDK_BINARIES ] ; then
+		echo "Please download the Android NDK $NDK_BINARIES from Google's servers and place it in this directory"
+		exit
+	fi
+	unzip $NDK_BINARIES
+fi
+
+if [ ! -d $ANDROID_SDK ] ; then
+	if [ ! -f $SDK_TOOLS ] ; then
+		echo "Please download the Android SDK $SDK_TOOLS from Google's servers and place it in this directory"
+		exit
+	fi
+	mkdir $ANDROID_SDK
+	pushd $ANDROID_SDK
+	unzip ../$SDK_TOOLS
+	bash tools/android update sdk --no-ui -a -t 1,2,3,33
+	popd
+fi
+
+# ok, now we have Qt, SDK, and NDK - let's get us some Subsurface
+if [ ! -d subsurface ] ; then
+	git clone git://github.com/Subsurface-divelog/subsurface
+fi
+pushd subsurface
+git pull --rebase
+popd
+
+if [ ! -d libdivecomputer ] ; then
+	git clone -b Subsurface-branch git://github.com/Subsurface-divelog/libdc libdivecomputer
+	pushd libdivecomputer
+	autoreconf --install
+	autoreconf --install
+	popd
+fi
+pushd libdivecomputer
+git pull --rebase
+if ! git checkout Subsurface-branch ; then
+	echo "can't check out the Subsurface-branch branch of libdivecomputer -- giving up"
+	exit 1
+fi
+popd
+
+
+# and now we need a monotonic build number...
+if [ ! -f "./buildnr.dat" ] ; then
+	BUILDNR=0
+else
+	BUILDNR=$(cat ./buildnr.dat)
+fi
+BUILDNR=`expr ${BUILDNR} + 1`
+echo "${BUILDNR}" > ./buildnr.dat
+
+echo "Building Subsurface-mobile ${VERSION} for Android, build nr ${BUILDNR} as Subsurface-mobile-$VERSION-${NAME}arm.apk"
+
+if [ "$1" = "release" ] || [ "$1" = "Release" ] || [ "$1" = "debug" ] || [ "$1" = "Debug" ] ; then
+	RELEASE=$1
+	shift
+else
+	RELEASE=Debug
+fi
+
+rm -f ./subsurface-mobile-build-arm/bin/QtApp-debug.apk
+rm -d ./subsurface-mobile-build-arm/AndroidManifest.xml
+rm -d ./subsurface-mobile-build-arm/bin/AndroidManifest.xml
+bash $USE_X subsurface/packaging/android/build.sh $RELEASE -buildnr ${BUILDNR} arm $@ 
+