Rocket.Chat Native Android Application.
Retrolambda needs java8 to be installed on your system
export ANDROID_HOME=/path/to/android/sdk
git clone https://github.com/RocketChat/Rocket.Chat.Android.git
cd Rocket.Chat.Android
echo "sdk.dir="$ANDROID_HOME > local.properties
./gradlew assembleDebug
Please report via GitHub issue :)