@AfterPermissionGranted(REQUEST_CAMERA_PERMISSION) private void takePicture() { String[] perms = {Manifest.permission.CAMERA}; if (EasyPermissions.hasPermissions(this, perms)) { Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); if (intent.resolveActivity(getPackageManager()) != null) { startActivityForResult(intent, REQUEST_IMAGE_CAPTURE); } } else { EasyPermissions.requestPermissions(this, "需要相机权限来拍照", REQUEST_CAMERA_PERMISSION, perms); } }怎么写，写在哪里，如果加上创建文档用来存储照片，怎么写，完整示例

这段代码是一个使用 EasyPermissions 库来请求相机权限，并启动相机拍照的方法。如果您需要在拍照后将照片保存到文件中，可以在 `onActivityResult()` 方法中处理照片数据并保存到指定位置。

完整示例如下：

private static final int REQUEST_CAMERA_PERMISSION = 1;
private static final int REQUEST_IMAGE_CAPTURE = 2;
private String currentPhotoPath;

@AfterPermissionGranted(REQUEST_CAMERA_PERMISSION)
private void takePicture() {
    String[] perms = {Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE};
    if (EasyPermissions.hasPermissions(this, perms)) {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (intent.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
                ex.printStackTrace();
            }
            // Continue only if the File was successfully created
            if (photoFile != null) {
                Uri photoURI = FileProvider.getUriForFile(this,
                        "com.example.android.fileprovider",
                        photoFile);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
            }
        }
    } else {
        EasyPermissions.requestPermissions(this, "需要相机权限来拍照和存储照片", REQUEST_CAMERA_PERMISSION, perms);
    }
}

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );

    // Save a file: path for use with ACTION_VIEW intents
    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) {
        // Get the dimensions of the View
        int targetW = imageView.getWidth();
        int targetH = imageView.getHeight();

        // Get the dimensions of the bitmap
        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
        bmOptions.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(currentPhotoPath, bmOptions);
        int photoW = bmOptions.outWidth;
        int photoH = bmOptions.outHeight;

        // Determine how much to scale down the image
        int scaleFactor = Math.min(photoW/targetW, photoH/targetH);

        // Decode the image file into a Bitmap sized to fill the View
        bmOptions.inJustDecodeBounds = false;
        bmOptions.inSampleSize = scaleFactor;
        bmOptions.inPurgeable = true;

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

        // Save the bitmap to a file
        try {
            FileOutputStream out = new FileOutputStream(currentPhotoPath);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

这个示例中，我们在 `takePicture()` 方法中请求了相机和存储权限，然后创建了一个用于保存照片的文件，并启动相机拍照。在 `onActivityResult()` 方法中，我们获取了拍摄的照片数据，并将其显示在一个 ImageView 中。然后，我们将照片保存到之前创建的文件中。请注意，在 `createImageFile()` 方法中，我们使用了 FileProvider 来获取照片文件的 Uri，以便在 Android N 及以上版本中能够正常使用。