unity调用安卓usb摄像头

要在Unity中调用安卓USB摄像头，首先需要确保你的安卓设备已经连接到电脑并且开启了开发者选项。以下是实现步骤：

1. 在Unity中创建一个新的脚本，命名为"WebcamCapture.cs"。这个脚本将负责捕获和显示USB摄像头的图像。

2. 在脚本中导入Unity的命名空间和Android的命名空间：using UnityEngine和using UnityEngine.Android。

3. 在脚本中创建一个私有的WebCamTexture变量，用于存储摄像头的图像数据：private WebCamTexture webcamTexture;

4. 在脚本的Start()方法中，使用WebCamTexture.devices获取设备上的所有相机设备。然后使用WebCamTexture.devices[0].name选择第一个设备（通常是USB摄像头）。

5. 调用WebCamTexture.Play()方法来启动摄像头，并将其分配给webcamTexture。

6. 在Update()方法中，使用GetComponent<Renderer>().material.mainTexture = webcamTexture来将捕获的图像应用到一个3D物体的材质上。

完成以上步骤后，你的Unity项目将能够调用安卓USB摄像头并显示捕获的图像。确保在构建Android项目之前，将其导出为一个Android项目，并在设备上安装和运行。同时，确保应用程序已经被授予使用摄像头的权限。

希望这些步骤能够帮助你成功在Unity中调用安卓USB摄像头。

相关问题

Unity for Android USBCamera

Unity可以通过Android的Camera2 API来访问USB摄像头。

首先，在Unity中创建一个Android插件，该插件将使用Android的Camera2 API来访问USB摄像头。然后，在Unity中调用该插件以获取从USB摄像头获取的视频数据。

以下是一个简单的Unity Android插件示例，可以用于访问USB摄像头：

public class USBCameraPlugin {

    private static CameraDevice camera;
    private static CaptureRequest.Builder previewBuilder;
    private static SurfaceTexture surfaceTexture;
    private static Surface previewSurface;
    private static HandlerThread handlerThread;
    private static Handler handler;
    private static Semaphore cameraOpenCloseLock = new Semaphore(1);

    public static void startCamera(int textureId) {
        // Open the camera
        CameraManager manager = (CameraManager) UnityPlayer.currentActivity.getSystemService(Context.CAMERA_SERVICE);
        String[] cameraIds = null;
        try {
            cameraIds = manager.getCameraIdList();
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
        if (cameraIds == null || cameraIds.length == 0) {
            return;
        }
        String cameraId = cameraIds[0];
        try {
            if (!cameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
                throw new RuntimeException("Time out waiting to lock camera opening.");
            }
            manager.openCamera(cameraId, new CameraDevice.StateCallback() {

                @Override
                public void onOpened(@NonNull CameraDevice cameraDevice) {
                    cameraOpenCloseLock.release();
                    camera = cameraDevice;
                    startPreview(textureId);
                }

                @Override
                public void onDisconnected(@NonNull CameraDevice cameraDevice) {
                    cameraOpenCloseLock.release();
                    cameraDevice.close();
                    camera = null;
                }

                @Override
                public void onError(@NonNull CameraDevice cameraDevice, int error) {
                    cameraOpenCloseLock.release();
                    cameraDevice.close();
                    camera = null;
                }
            }, handler);
        } catch (InterruptedException e) {
            throw new RuntimeException("Interrupted while trying to lock camera opening.", e);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    public static void stopCamera() {
        if (camera != null) {
            camera.close();
            camera = null;
        }
    }

    private static void startPreview(int textureId) {
        if (camera == null) {
            return;
        }
        try {
            // Create a surface texture to receive camera data
            surfaceTexture = new SurfaceTexture(textureId);
            surfaceTexture.setDefaultBufferSize(1920, 1080);
            previewSurface = new Surface(surfaceTexture);

            // Build the preview request
            previewBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            previewBuilder.addTarget(previewSurface);

            // Create a handler thread to handle camera events
            handlerThread = new HandlerThread("CameraBackground");
            handlerThread.start();
            handler = new Handler(handlerThread.getLooper());

            // Start the preview
            camera.createCaptureSession(Arrays.asList(previewSurface), new CameraCaptureSession.StateCallback() {

                @Override
                public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                    try {
                        cameraCaptureSession.setRepeatingRequest(previewBuilder.build(), null, handler);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
                    stopCamera();
                }

            }, handler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
}

然后，在Unity中调用该插件以访问USB摄像头。以下是一个简单的C#脚本示例，可以用于在Unity中调用Android插件并从USB摄像头获取视频数据：

public class USBCamera : MonoBehaviour {

    private AndroidJavaObject plugin;

    private Texture2D texture;
    private byte[] data;

    private int width = 1920;
    private int height = 1080;

    void Start () {
        // Create the Android plugin object
        plugin = new AndroidJavaObject("com.example.usbcamera.USBCameraPlugin");

        // Set the texture to display camera data
        texture = new Texture2D(width, height, TextureFormat.RGBA32, false);
        GetComponent<Renderer>().material.mainTexture = texture;

        // Call the Android plugin to start the camera
        plugin.Call("startCamera", texture.GetNativeTexturePtr().ToInt32());
    }

    void OnDestroy() {
        // Call the Android plugin to stop the camera
        plugin.Call("stopCamera");
    }

    void Update () {
        // Update the texture with the latest camera data
        if (data == null) {
            data = new byte[width * height * 4];
        }
        texture.LoadRawTextureData(data);
        texture.Apply();
    }

    private void OnApplicationQuit() {
        // Call the Android plugin to stop the camera
        plugin.Call("stopCamera");
    }
}

这样，你就可以在Unity中通过Android插件访问USB摄像头并获取视频数据。