相机预览是胖乎乎的

Question

我正在尝试在我的应用程序上实现相机功能。由于这是我第一次这样做，我在相机预览中遇到了一些问题。

我目前的布局如下：

正在制作这样的预览：

但我想要这样的事情：

以下是我相机的代码：

public class FragmentPhoto extends Fragment implements TextureView.SurfaceTextureListener {

    private Camera camera;     

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        final View view = inflater.inflate(R.layout.fragment_photo, container, false);

        final TextureView textureView = (TextureView) view.findViewById(R.id.photo_view);
        textureView.setSurfaceTextureListener(this);

        return view;
    }

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
        try {
            camera = Camera.open();
            camera.setDisplayOrientation(90);
            camera.setPreviewTexture(surface);
            camera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
        camera.stopPreview();
        camera.release();
        return true;
    }

    @Override
    public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
        // Ignored, the Camera does all the work for us
    }

    @Override
    public void onSurfaceTextureUpdated(SurfaceTexture surface) {
        // Update your view here!
    }
}

有没有办法裁剪相机？为了不预览这个胖乎乎的？这样做最好的方法是什么？