Install Android Emulator(Arrch64) for Jetson Nano

* Tips
- if you want start the all over, delete /opt/android-sdk/
- To update the emulator version(other pre-build number), delete the /emulator and start procedure over from the middle.

* Step 1
sudo apt update && sudo apt upgrade
sudo apt install default-jdk python3-pip repo python-is-python3 unzip libpcre2-dev adb
## i did not include repo because i was told there was no repo

* Step 2
wget https://dl.google.com/android/repository/commandlinetools-linux-11076708_latest.zip
## i'll use the latest version "commandlinetools-linux"
unzip commandlinetools-linux-11076708_latest.zip -d android-sdk
sudo mv android-sdk /opt/
mkdir /opt/android-sdk/cmdline-tools/latest
mv /opt/android-sdk/cmdline-tools/* /opt/android-sdk/cmdline-tools/latest
echo "export ANDROID_SDK_ROOT=/opt/android-sdk" >> ~/.bashrc
echo "export ANDROID_HOME=/opt/android-sdk" >> ~/.bashrc
echo "export ANDROID_EMULATOR_WAIT_TIME_BEFORE_KILL=60" >> ~/.bashrc
echo "export PATH=$PATH:/opt/android-sdk/cmdline-tools/latest/bin" >> ~/.bashrc
source ~/.bashrc
sdkmanager --update
sdkmanager --licenses
## Appect All licenses

* Step 3
cd /opt/android-sdk/
## download https://ci.android.com/builds/submitted/11435509/emulator-linux_aarch64/latest/sdk-repo-linux_aarch64-emulator-11435509.zip and rename "emulator.zip" and copy here
## i'll use 11435509 build
unzip emulator.zip
cd  emulator
cat source.properties
## memo the Pkg.Revision = 34.2.8
vi /opt/android-sdk/emulator/package.xml
## copy and paste this text and edit version: <major>, <minor>, <micro> and save   text => https://chromium.googlesource.com/android_tools/+/refs/heads/master/sdk/emulator/package.xml

* Step 4
sdkmanager "system-images;android-28;google_apis;arm64-v8a"
## i'll use API28(Android9.0)
avdmanager -v create avd -f -n MyAVD -k "system-images;android-28;google_apis;arm64-v8a" -p "/opt/android-sdk/avd"
## [no]

* Step 5
mkdir /opt/android-sdk/platforms
mkdir /opt/android-sdk/platform-tools
echo "Vulkan = on" >> ~/.android/advancedFeatures.ini
## Turn on ShaderTranslator in case it is used. (Swiftshader cases an error, but it's only turned auto off, so it's not a problem)
echo "GLDirectMem = on" >> ~/.android/advancedFeatures.ini

* Step 6
sudo gpasswd -a $USER kvm
##logout and re-login
/opt/android-sdk/emulator/emulator -accel-check

* Step 7
/opt/android-sdk/emulator/emulator @MyAVD -cores 4 -lowram -memory 2048 -gpu swiftshader -ports 5554,5555 -skip-adb-auth -no-boot-anim -no-snapshot -no-metrics -qemu -machine gic-version=2
## INFO    | Boot completed in 126014 ms
## The emulator crash message appears, but if the optional log is left blank and [Don't Send] is pressed, the emulator will continue to run.
## The error message also appears when the emulator is deleted.