要将Camera的位置设置为与表面垂直，您可以使用Camera.Parameters类中的setRotation方法来设置相机的方向。以下是一个示例代码，演示如何将相机位置设置为与表面垂直：

import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import java.io.IOException;

public class MainActivity extends Activity implements SurfaceHolder.Callback {
    private Camera camera;
    private SurfaceView surfaceView;
    private SurfaceHolder surfaceHolder;

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

        surfaceView = findViewById(R.id.surfaceView);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder surfaceHolder) {
        camera = Camera.open();
        try {
            camera.setPreviewDisplay(surfaceHolder);
            setCameraRotation();
            camera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
        // 如果预览变化或旋转，确保停止预览
        if (surfaceHolder.getSurface() == null) {
            return;
        }
        try {
            camera.stopPreview();
        } catch (Exception e) {
            e.printStackTrace();
        }

        // 在这里重置相机参数，例如，设置预览大小、对焦模式等
        // ...

        // 重新启动预览
        try {
            camera.setPreviewDisplay(surfaceHolder);
            setCameraRotation();
            camera.startPreview();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
        // 释放相机资源
        camera.stopPreview();
        camera.release();
        camera = null;
    }

    private void setCameraRotation() {
        Camera.Parameters parameters = camera.getParameters();
        int cameraOrientation = 90; // 设置相机方向，垂直为90度

        if (getApplicationContext().getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
            camera.setDisplayOrientation(cameraOrientation);
            parameters.setRotation(cameraOrientation);
        } else if (getApplicationContext().getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
            camera.setDisplayOrientation(0);
            parameters.setRotation(0);
        }

        camera.setParameters(parameters);
    }
}

这个示例代码创建了一个SurfaceView来预览相机图像，然后在surfaceCreated方法中打开相机，并通过setCameraRotation方法设置相机的方向。在surfaceChanged方法中，您可以根据需要重新设置相机参数，并在重新启动预览之前调用setCameraRotation方法来确保相机方向正确。在surfaceDestroyed方法中，释放并释放相机资源。