First step: Install Android SDK

1. yaourt -S android-sdk android-sdk-platform-tools android-sdk-build-tools
   Note: Maybe you'll have problems with the lasta package: ncurses5-compat-libs. In order to avoid this problem you have to use this command: gpg --recv-keys F7E48EDB. You can find clarification here.
2. yaourt -S genymotion
   Note: You'll need install virtual-box and his modules, yaourt will make for you but you need choos between ArchLinux host modules or DKMS host modules.
3. Enter in super user mode with su - and then do echo -e "vboxdrv\nvboxnetflt\nvboxnetadp\nvboxpci" > /etc/modules-load.d/virtualbox.conf
   Note: You need do this with super user because need super user permissions and with sudo, for us at least, doesn't work.
4. sudo modprobe vboxdrv vboxnetadp vboxnetflt
   Activate for current session.
5. sudo chmod -R 777 /opt/android-sdk
   Give permisions over Android SDK folders.
6. Restart
   Is needed by Genymotion for detect VirtualBox modules.
   NOTE: You need install Java JDK for user Android SDK.
7. /opt/android-sdk/tools/android This command launch Android SDK. You can make fixed in your dock application (for example Plank), or create a desktop-launcher.

Second step: React-Native

1. npm install -g react-native-cli Note: You need have installed node and npm for use React Native.

Optional Step: Upgrade watchers limit

1. echo "fs.inotify.max_user_watches=524288" >> /etc/sysctl.conf Note: Use this command in super user session.
2. sudo sysctl -p /etc/sysctl.conf Make this active without reboot session.