Unity3d检查用户是否已授权设备摄像头

Question

I have developed an app with Vuforia for iOS and Android, when the app is run for the first time, the user is prompted to authorize the use of the device's camera.

If the user does not authorize the camera, when the user navigates to the "capture" scene, the camera view is black.

I have looked at the Untiy3D Documentation and found the Application.HasUserAuthorization class, but if I understand correctly, this only works on the Unity web player?

How can I check if the user has allowed the use of the camera in Unity3D (c#).

Any suggestions would be greatly appreciated! TIA!

Answer 1

As a user on Android I get prompted when installing the apk that it will use the Camera, once I accept that is it. As a developer I don't need to check.

This is how I start the camera using Vuforia API.

 CameraDevice.Instance.Stop();
 CameraDevice.Instance.Init(CameraDevice.CameraDirection.CAMERA_FRONT);
 CameraDevice.Instance.Start();

CameraDevice is a Singleton that you can call.

Answer 2

Application.RequestUserAuthorization apparently works for any PC or mobile device camera. I am using it and the NatCam plugin for Unity3D on iPhone with the following script to check / prompt for user camera permissions. The while() loop is to allow them to take their time giving permission.

int cameraPermission = 0;

// Use this for initialization
public override void Start () {

    if (!Application.HasUserAuthorization (UserAuthorization.WebCam)) {
        // request camera use
        Application.RequestUserAuthorization (UserAuthorization.WebCam);
    } else {
        cameraPermission = 1;
    }

    // if we don't have permission, wait until we do 
    while (cameraPermission != 1) {
        // wait a sec
        System.Threading.Thread.Sleep(1000);
        // if user enables preference
        if (Application.HasUserAuthorization (UserAuthorization.WebCam)) {
            // proceed to start app
            cameraPermission = 1;
        }
    }

    // Start base
    base.Start ();
}