yes | $ANDROID_HOME/tools/bin/sdkmanager --licenses
-# The android-16 platform is used in the ecj package:
-$ANDROID_HOME/tools/bin/sdkmanager "build-tools;27.0.1" "platforms;android-27" "platforms;android-16"
+# The android-21 platform is used in the ecj package:
+$ANDROID_HOME/tools/bin/sdkmanager "build-tools;27.0.3" "platforms;android-27" "platforms;android-21"