我有三个ActivityMessagesAttachPhotoActivityMessageGalleryFolderSelectorActivityImagePickerActivityMessagesAttachPhotoActivity使用startActivityForResult()调用MessageGalleryFolderSelectorActivity。MessageGalleryFolderSelectorActivityActivity显示手机上的照片文件夹并选择一个文件夹。然后使用setActivityForResult()调用ImagePickerActivit