Import Android-nRF-Toolbox SourceCode into Android Studio

Hi all,

I'm a beginner and planning to import Android-nRF-Toolbox source code from Github into Android Studio after reading the README by the following steps:

1. I open Android BLE Library project in the Android Studio and it successfully run the example.ble-gatt-server like the picture shows:

2. I open Android-nRF-Toolbox project in the Android Studio and run, get this error:

Can you guide me to resolve this?

 

And my final goal is to build a specific profile or API in ToolBox app like Heart rate monitor already in this app, which can connect and communicate with nRF52 DK.

Do you have any advice that where I should begin to learn after the source code can be compiled and run?

Thanks a lot for your help and suggestions.

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