下面是一个示例代码，展示了如何在Android设备上使用相机拍摄照片并保存到本地存储。

首先，确保你的Android项目中已经添加了相机权限：

然后，创建一个包含相机功能的Activity，例如CameraActivity：

public class CameraActivity extends AppCompatActivity {

    private static final int REQUEST_IMAGE_CAPTURE = 1;

    private ImageView imageView;
    private String currentPhotoPath;

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

        imageView = findViewById(R.id.imageView);

        Button captureButton = findViewById(R.id.captureButton);
        captureButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dispatchTakePictureIntent();
            }
        });
    }

    private void dispatchTakePictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            File photoFile = null;
            try {
                photoFile = createImageFile();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            if (photoFile != null) {
                Uri photoURI = FileProvider.getUriForFile(this,
                        "com.example.android.fileprovider",
                        photoFile);
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
            }
        }
    }

    private File createImageFile() throws IOException {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,
                ".jpg",
                storageDir
        );
        currentPhotoPath = image.getAbsolutePath();
        return image;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            galleryAddPic();
            setPic();
        }
    }

    private void galleryAddPic() {
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        File f = new File(currentPhotoPath);
        Uri contentUri = Uri.fromFile(f);
        mediaScanIntent.setData(contentUri);
        this.sendBroadcast(mediaScanIntent);
    }

    private void setPic() {
        int targetW = imageView.getWidth();
        int targetH = imageView.getHeight();

        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
        bmOptions.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(currentPhotoPath, bmOptions);
        int photoW = bmOptions.outWidth;
        int photoH = bmOptions.outHeight;

        int scaleFactor = Math.min(photoW / targetW, photoH / targetH);

        bmOptions.inJustDecodeBounds = false;
        bmOptions.inSampleSize = scaleFactor;
        bmOptions.inPurgeable = true;

        Bitmap bitmap = BitmapFactory.decodeFile(currentPhotoPath, bmOptions);
        imageView.setImageBitmap(bitmap);
    }
}

在上面的代码中，我们创建了一个CameraActivity，并在布局文件中添加了一个ImageView和一个用于触发拍照的按钮。当用户点击拍照按钮时，我们调用dispatchTakePictureIntent()方法来启动相机应用，并将拍摄的照片保存到一个临时文件中。

在createImageFile()方法中，我们创建了一个以时间戳命名的临时文件，并将其保存到应用的外部存储目录下的Pictures文件夹中。

在onActivityResult()方法中，我们调用galleryAddPic()方法将照片添加到Android的媒体库中，并调用setPic()方法将照片显示在ImageView中。

请注意，上面的代码中使用了FileProvider来获取拍摄照片的URI，并且需要在Manifest文件中添加FileProvider的配置：

在res/xml文件夹中创建一个名