Question

如何从Android摄像头实例中获取当前打开的Android摄像头的ID？我在参数中看不到它，getCameraInfo需要id作为参数。

Answer 1

没有办法获取当前打开的Android摄像头的ID。我打开它时最终存储了id。

Answer 2

这只是一些相机，所以你循环寻找你想要的相机。

这是一个找到前置摄像头的片段：

int cameraId = -1;
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
  CameraInfo info = new CameraInfo();
  Camera.getCameraInfo(i, info);
  if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
    Log.d(DEBUG_TAG, "Camera found");
    cameraId = i;
    break;
  }
}

Answer 3

  private int findFrontFacingCameraID() {
        int cameraId = -1;
        // Search for the front facing camera
        int numberOfCameras = Camera.getNumberOfCameras();
        for (int i = 0; i < numberOfCameras; i++) {
          CameraInfo info = new CameraInfo();
          Camera.getCameraInfo(i, info);
          if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
            Log.d(TAG, "Camera found");
            cameraId = i;
            break;
          }
        }
        return cameraId;
     }

Answer 4

对于具有更新的相机API的Kotlin：

fun getCameraId(context: Context, facing: Int): String {
    val manager = context.getSystemService(CAMERA_SERVICE) as CameraManager

    return manager.cameraIdList.first {
        manager
            .getCameraCharacteristics(it)
            .get(CameraCharacteristics.LENS_FACING) == facing
    }
}

facing的有效值为：

CameraCharacteristics.LENS_FACING_FRONT
CameraCharacteristics.LENS_FACING_BACK
CameraCharacteristics.LENS_FACING_EXTERNAL

获取当前打开的相机的ID

4 个答案: