无法打开前置android内置摄像头

Question

当我运行打开前置摄像头的代码时，我看到一个黑屏越来越亮（看起来像是一个摄像头捕捉）。

我的代码：

public class Cam extends Activity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cam);


        openFrontFacingCameraGingerbread();
    }
    private Camera openFrontFacingCameraGingerbread()
        {
            int cameraCount = 0;
            Camera camera = null;
            Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
            cameraCount = Camera.getNumberOfCameras();
            for (int camIdx = 0; camIdx < cameraCount; camIdx++)
            {
                Camera.getCameraInfo(camIdx, cameraInfo);
                if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT)
                {
                    try
                    {
                        camera = Camera.open(camIdx);
                        Log.e("Camera Operation", "Camera opned");
                    }
                    catch (RuntimeException e)
                    {
                        Log.e("Camera Operation", "Camera failed to open: " + e.getLocalizedMessage());
                    }
                }
        }

        return camera;
    }
}

任何建议都将不胜感激。

注意：使用camera2 API代码显示相同的屏幕。