Android电子邮件应用附件无效

Question

我正在尝试开发电子邮件应用，我想要附加图片，但我得到了NullPointerException。这是我的代码：

Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
columnIndex = cursor.getColumnIndex(filePathColumn[0]);
attachmentfile = cursor.getString(columnIndex);

Log.e("Attachment Path: ", attachmentfile);
URI = Uri.parse("file://" + attachmentfile);
cursor.close();`

请帮帮我