2.5.9
This app provides examples of how to use the MetaWear API and a simple app for interacting with the board. It uses the sample BluetoothLeGatt app on the Android developer page and the Nordic nRF Toolbox app as references.
http://developer.android.com/samples/BluetoothLeGatt/index.html
https://play.google.com/store/apps/details?id=no.nordicsemi.android.nrftoolbox&hl=en
The API was built in Android Studio 1.1.0. It is targeted for Android 5.0.1 (SDK 21) with Android 4.3 (SDK 18) as the minimum required SDK, and requires a JDK compiler compliance level of 1.7. You will also need the Android Support Library package. You can import the project into Android Studio with the "Open an existing Android Studio project" option from the Android Studio home screen.