Build android app on termux

build_android_app_on_termux.md

Build android app on termux

1. install termux

install termux from F-Droid.

2. setup termux

apt update
apt upgrade
# source.list changed
apt update
termux-setup-storage

3. install ubuntu

apt install git wget proot
git clone https://github.com/MFDGaming/ubuntu-in-termux.git
cd ubuntu-in-termux
# install ubuntu
bash ubuntu.sh -y
# fix PATH order
sed -Ei 's|(:/bin)(:/usr/bin):|\2\1:|' startubuntu.sh
# start
./startubuntu.sh

4. install packages for build

Now, in ubuntu.

apt update
apt upgrade
apt install default-jdk-headless openjdk-8-jdk-headless unzip aapt2

5. install android cmdline-tools and platforms

Download Android Command Line Tools for Linux from https://developer.android.com/studio

cd ~
unzip /sdcard/Download/commandlinetools-linux-9477386_latest.zip
export ANDROID_HOME=$HOME/android/sdk
mkdir -p $ANDROID_HOME/cmdline-tools
mv cmdline-tools $ANDROID_HOME/cmdline-tools/latest
export PATH=$PATH:$ANDROID_HOME/cmdline-tools/latest/bin
# just for fix broken dependencies
JAVA_OPTS=-Dos.arch=amd64 sdkmanager emulator
# install target platforms
sdkmanager 'platforms;android-26'

5. replace aapt2

cd project-dir
echo "sdk.dir=$ANDROID_HOME" > local.properties
alias gradlew='JAVA_HOME=/usr/lib/jvm/java-8-openjdk-arm64 bash ./gradlew'
# first build should fail. it is for downloading aapt2-*-linux.jar
gradlew
# replace aapt2 binary for arm64
find ~/.gradle -name 'aapt2-*-linux.jar' -type f | xargs -I{} jar -u -f {} -C /usr/bin aapt2

6. build apk!

cd project-dir
gradlew