在较新的Android版本上，Android.hardware.Camera类已被弃用，并且在Android 10及更高版本中已被移除。取而代之的是使用Camera2 API来访问相机功能。

下面是一个使用Camera2 API的示例代码：

首先，在AndroidManifest.xml文件中添加相机权限：

然后，在Activity中使用CameraManager类来获取和控制相机：

import android.Manifest;
import android.content.pm.PackageManager;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CaptureRequest;
import android.os.Bundle;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import java.util.Arrays;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "Camera2Example";
    private static final int REQUEST_CAMERA_PERMISSION = 200;

    private SurfaceView surfaceView;
    private Button captureButton;

    private CameraManager cameraManager;
    private String cameraId;
    private CameraDevice cameraDevice;
    private CameraCaptureSession cameraCaptureSession;
    private CaptureRequest.Builder captureRequestBuilder;

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

        surfaceView = findViewById(R.id.surfaceView);
        captureButton = findViewById(R.id.captureButton);

        captureButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                captureImage();
            }
        });

        cameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);
        try {
            cameraId = cameraManager.getCameraIdList()[0];
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }

        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(@NonNull SurfaceHolder holder) {
                openCamera();
            }

            @Override
            public void surfaceChanged(@NonNull SurfaceHolder holder, int format, int width, int height) {

            }

            @Override
            public void surfaceDestroyed(@NonNull SurfaceHolder holder) {
                closeCamera();
            }
        });
    }

    private void openCamera() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION);
            return;
        }

        try {
            cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
                @Override
                public void onOpened(@NonNull CameraDevice camera) {
                    cameraDevice = camera;
                    createCameraPreviewSession();
                }

                @Override
                public void onDisconnected(@NonNull CameraDevice camera) {
                    cameraDevice.close();
                }

                @Override
                public void onError(@NonNull CameraDevice camera, int error) {
                    cameraDevice.close();
                }
            }, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void createCameraPreviewSession() {
        try {
            Surface surface = surfaceView.getHolder().getSurface();

            captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            captureRequestBuilder.addTarget(surface);

            cameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {
                @Override
                public void onConfigured(@NonNull CameraCaptureSession session) {
                    if (cameraDevice == null) {
                        return;
                    }

                    cameraCaptureSession = session;

                    try {
                        captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_AUTO);
                        cameraCaptureSession.setRepeatingRequest(captureRequestBuilder.build(), null, null);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onConfigureFailed(@NonNull CameraCaptureSession session) {
                    Log.e(TAG, "Failed to configure camera capture session");
                }
            }, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void closeCamera() {
        if (cameraCaptureSession != null) {
            cameraCaptureSession.close();
            cameraCaptureSession = null;
        }

        if (cameraDevice != null) {
            cameraDevice.close();
            cameraDevice = null;
        }
    }

    private void captureImage() {
        if (cameraDevice == null) {
            return;
        }

        try {
            CaptureRequest.Builder captureBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);