怎么在拍照时获取该图片的uri

在拍照时获取图片的uri，可以通过以下步骤实现：

1. 在AndroidManifest.xml文件中添加文件提供器(FileProvider)：

<provider
   android:name="androidx.core.content.FileProvider"
   android:authorities="${applicationId}.fileProvider"
   android:exported="false"
   android:grantUriPermissions="true">
   <meta-data
       android:name="android.support.FILE_PROVIDER_PATHS"
       android:resource="@xml/file_paths" />
</provider>

2. 在res/xml文件夹中创建一个名为file_paths.xml的文件，并在其中指定保存图片的路径：

<paths xmlns:android="http://schemas.android.com/apk/res/android">
   <external-files-path
       name="my_images"
       path="Pictures" />
</paths>

3. 在拍照的Activity中，创建一个文件对象并将其保存在指定的路径下：

File photoFile = null;
try {
   photoFile = File.createTempFile(
       "IMG_",  /* prefix */
       ".jpg",  /* suffix */
       getExternalFilesDir(Environment.DIRECTORY_PICTURES) /* directory */
   );
} catch (IOException ex) {
   // Error occurred while creating the File
   ...
}

// Save a file: path for use with ACTION_VIEW intents
String currentPhotoPath = photoFile.getAbsolutePath();

4. 启动相机应用，并在onActivityResult()方法中获取拍摄后的照片uri：

private static final int REQUEST_IMAGE_CAPTURE = 1;

private void dispatchTakePictureIntent() {
   Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
   // Ensure that there's a camera activity to handle the intent
   if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
       // Create the File where the photo should go
       File photoFile = null;
       try {
           photoFile = createImageFile();
       } catch (IOException ex) {
           // Error occurred while creating the File
           ...
       }
       // Continue only if the File was successfully created
       if (photoFile != null) {
           Uri photoURI = FileProvider.getUriForFile(this,
                                                   BuildConfig.APPLICATION_ID + ".fileProvider",
                                                   photoFile);
           takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
           startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
       }
   }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
   if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
       // Get the uri of the captured image
       Uri uri = Uri.fromFile(photoFile);
       ...
   }
}

注意：在Android 10及以上版本中，需要使用FileProvider来获取文件uri，而不是直接使用file://协议。