android studio uvc 摄像头

Android Studio支持UVC（USB Video Class）摄像头。UVC是一种通用的USB视频设备驱动程序，它允许USB摄像头在没有特定驱动程序的情况下在各种操作系统上运行。

要在Android Studio中使用UVC摄像头，需要使用Android的Camera2 API。使用Camera2 API，您可以捕获UVC摄像头的视频流并在Android设备上进行实时预览和处理。

以下是使用UVC摄像头的基本步骤：

1. 检查设备是否支持Camera2 API。您可以使用以下代码行检查：

PackageManager pm = getPackageManager();
boolean isCameraSupported = pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY);

2. 获取CameraManager实例并列出可用的摄像头设备：

CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
String[] cameraIds = cameraManager.getCameraIdList();

3. 打开UVC摄像头设备并创建CameraCaptureSession和CaptureRequest对象：

cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
    @Override
    public void onOpened(CameraDevice camera) {
        // Create CameraCaptureSession and CaptureRequest objects
    }

    @Override
    public void onDisconnected(CameraDevice camera) {
        // Handle camera disconnected
    }

    @Override
    public void onError(CameraDevice camera, int error) {
        // Handle camera error
    }
}, null);

4. 在CameraCaptureSession中设置Surface，以便在Android设备上预览UVC摄像头的视频流：

Surface previewSurface = new Surface(textureView.getSurfaceTexture());
List<Surface> surfaces = Arrays.asList(previewSurface);
cameraDevice.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {
    @Override
    public void onConfigured(CameraCaptureSession session) {
        // Set up CaptureRequest for preview
    }

    @Override
    public void onConfigureFailed(CameraCaptureSession session) {
        // Handle session configuration failure
    }
}, null);

5. 捕获UVC摄像头的视频流并进行处理：

// Set up CaptureRequest for video capture
CaptureRequest.Builder captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
captureRequestBuilder.addTarget(videoSurface);
captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
captureRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, new Range<>(30, 30));
cameraCaptureSession.setRepeatingRequest(captureRequestBuilder.build(), null, null);

这些是使用UVC摄像头的基本步骤。要深入了解如何使用Camera2 API捕获UVC摄像头的视频流，请参阅Android官方文档。