Incorrect class name of the Polar BLE SDK class you want to use

[PaoloSalvatico]

Platform your question concerns:

• [x] Android
• [ ] iOS
• [ ] Other
• [ ] Platform is not relevant for this question

Device:

• [ ] Polar OH1
• [x] Polar Verity Sense
• [ ] Polar H10
• [ ] Polar H9
• [ ] Other
• [ ] Device is not relevant for this question

Description: I'm working on a Unity project that will use the poler sdk in the Meta Quest 3. I created an .aar file from the demo PolarSDK-ECG-HR-Demo and i put it in the Unity folder, then i updated manifest and gradle.build. I created a script to use the sdk function, but i keep receiving the same error "Java.lang.ClassNotFoundException to com.polar.sdk.api.PolarBleApiDefaultImpl" to the class name i put in the script.

My question is what should i put as class name to create an instance of the polar sdk and use its functions? Alse Is it possible to do it in the first place, can i create a file .aar and put in Unity then create a build that can use the polar functions?

Here's my script:

// Unity script

using UnityEngine; using UnityEngine.UI; using TMPro; using UnityEngine.Android; using System; using System.Collections;

public class PolarManager : MonoBehaviour { public TextMeshProUGUI statusText; // Reference to your UI Text element public TextMeshProUGUI playerText; public TextMeshProUGUI activityText;

private AndroidJavaObject polarBleSdk;
private string cacheDirectory;

void Start()
{
    StartCoroutine(RequestPermissionsCoroutine());
}

public void StartPermission()
{
    StartCoroutine(RequestPermissionsCoroutine());
}

IEnumerator RequestPermissionsCoroutine()
{
    // Request permissions
    Permission.RequestUserPermission(Permission.FineLocation);
    Permission.RequestUserPermission("android.permission.BLUETOOTH_CONNECT");
    Permission.RequestUserPermission("android.permission.BLUETOOTH_SCAN");

    // Wait until permissions are granted
    while (!Permission.HasUserAuthorizedPermission(Permission.FineLocation) ||
           !Permission.HasUserAuthorizedPermission("android.permission.BLUETOOTH_CONNECT") ||
           !Permission.HasUserAuthorizedPermission("android.permission.BLUETOOTH_SCAN"))
    {
        yield return null;
    }

    // Permissions granted, proceed to initialize
    CallNativePlugin();
    //StartScanning();
}

public void CallNativePlugin()
{
    // Retrieve the UnityPlayer class.
    AndroidJavaClass unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
    if (unityPlayerClass == null) return;
    UpdateStatus(playerText, "UnityPlayer found.");

    // Retrieve the UnityPlayerActivity object ( a.k.a. the current context )
    AndroidJavaObject unityActivity = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity");
    if (unityActivity == null) return;
    UpdateStatus(activityText, "Activity ok.");

    // Retrieve the PolarBleApiDefaultImpl class from the Polar SDK.
    AndroidJavaClass polarBleApiDefaultImpl = new AndroidJavaClass("com.polar.sdk.api.PolarBleApiDefaultImpl");
    if (polarBleApiDefaultImpl == null) return;
    UpdateStatus(statusText, "polar api default instantiate");

    // Initialize the PolarBleApi with desired features, e.g., HR monitoring
    int features = (int)PolarBleSdkFeature.FEATURE_HR;
    polarBleSdk = polarBleApiDefaultImpl.CallStatic<AndroidJavaObject>("defaultImplementation", unityActivity, features);

    UpdateStatus(activityText, "PolarBleApi initialized.");

    // Set API callback
    SetApiCallback();
}

void SetApiCallback()
{
    // Create a callback object
    AndroidJavaProxy apiCallback = new PolarBleApiCallback(this);
    polarBleSdk.Call("setApiCallback", apiCallback);
}

public void StartScanning()
{
    polarBleSdk.Call("searchForDevice");
}

public void ConnectToDevice(string deviceId)
{
    polarBleSdk.Call("connectToDevice", deviceId);
}

public void DisconnectFromDevice(string deviceId)
{
    polarBleSdk.Call("disconnectFromDevice", deviceId);
}

// Callback methods
public void OnDeviceConnected(string identifier)
{
    UpdateStatus(statusText, "Device connected: " + identifier);
}

public void OnDeviceDisconnected(string identifier)
{
    UpdateStatus(statusText, "Device disconnected: " + identifier);
}

public void OnHeartRateReceived(string identifier, int heartRate)
{
    UpdateStatus(statusText, "Heart Rate: " + heartRate);
    // Use the heart rate data as needed
}

public void OnDeviceFound(string deviceId, string name)
{
    UpdateStatus(statusText, "Device found: " + name + " (" + deviceId + ")");
    // Optionally, automatically connect or display a list to the user
    ConnectToDevice(deviceId);
}

void UpdateStatus(TextMeshProUGUI text, string message)
{
    text.text += message + "\n";
}

// Enums for features
public enum PolarBleSdkFeature
{
    FEATURE_HR = 0,
}

// AndroidJavaProxy for PolarBleApiCallback
private class PolarBleApiCallback : AndroidJavaProxy
{
    private PolarManager manager;

    public PolarBleApiCallback(PolarManager manager) : base("com.polar.polarsdkecghrdemo")
    {
        this.manager = manager;
    }

    public void deviceConnected(AndroidJavaObject polarDeviceInfo)
    {
        string deviceId = polarDeviceInfo.Get<string>("deviceId");
        manager.OnDeviceConnected(deviceId);
    }

    public void deviceDisconnected(AndroidJavaObject polarDeviceInfo)
    {
        string deviceId = polarDeviceInfo.Get<string>("deviceId");
        manager.OnDeviceDisconnected(deviceId);
    }

    public void hrNotificationReceived(string identifier, AndroidJavaObject polarHrData)
    {
        int heartRate = polarHrData.Get<int>("hr");
        manager.OnHeartRateReceived(identifier, heartRate);
    }

    public void deviceFound(AndroidJavaObject polarDeviceInfo)
    {
        string deviceId = polarDeviceInfo.Get<string>("deviceId");
        string name = polarDeviceInfo.Get<string>("name");
        manager.OnDeviceFound(deviceId, name);
    }
}

}