Android 将Uri转换成File

今天在项目中遇到将返回的Uri类型转换成File。将其写成一个方法：

private File uri2File(Uri uri) {
        String img_path;
        String[] proj = {MediaStore.Images.Media.DATA};
        Cursor actualimagecursor = managedQuery(uri, proj, null,
                null, null);
        if (actualimagecursor == null) {
            img_path = uri.getPath();
        } else {
            int actual_image_column_index = actualimagecursor
                    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            actualimagecursor.moveToFirst();
            img_path = actualimagecursor
                    .getString(actual_image_column_index);
        }
        File file = new File(img_path);
        return file;
    }