如何正确查找物理摄像头ID，Android Studio

implementation 'androidx.camera:camera-camera2:1.1.0-alpha07'
implementation 'androidx.camera:camera-lifecycle:1.1.0-alpha07'
implementation 'androidx.camera:camera-view:1.0.0-alpha23'

<uses-permission android:name="android.permission.CAMERA" />

ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(context);
cameraProviderFuture.addListener(() -> {
    try {
        ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
        // 在此处继续操作相机设备
    } catch (ExecutionException | InterruptedException e) {
        // 处理异常
    }
}, ContextCompat.getMainExecutor(context));

CameraProvider cameraProvider = cameraProviderFuture.get();
ListenableFuture<Iterable<CameraInfo>> cameraInfoListFuture = cameraProvider.getCameraInfo();
cameraInfoListFuture.addListener(() -> {
    try {
        Iterable<CameraInfo> cameraInfoList = cameraInfoListFuture.get();
        // 在此处遍历cameraInfoList获取相机设备的信息
    } catch (ExecutionException | InterruptedException e) {
        // 处理异常
    }
}, ContextCompat.getMainExecutor(context));

for (CameraInfo cameraInfo : cameraInfoList) {
    if (cameraInfo.getLensFacing() == CameraSelector.LENS_FACING_BACK) {
        String cameraId = cameraInfo.getCameraId();
        // 在此处获取到了物理摄像头ID
        break;
    }
}