Refresh thumbnail after downloading attachment

k9mail/src/main/java/com/fsck/k9/ui/messageview/AttachmentController.java

@@ -92,6 +92,7 @@ public class AttachmentController {
         downloadAttachment(localPart, new Runnable() {
             @Override
             public void run() {
+                messageViewFragment.refreshAttachmentThumbnail(attachment);
                 saveAttachmentTo(directory);
             }
         });

k9mail/src/main/java/com/fsck/k9/ui/messageview/AttachmentView.java

@@ -77,12 +77,7 @@ public class AttachmentView extends FrameLayout implements OnClickListener, OnLo
         attachmentName.setText(attachment.displayName);
         attachmentInfo.setText(SizeFormatter.formatSize(getContext(), attachment.size));
 
-        ImageView thumbnailView = (ImageView) findViewById(R.id.attachment_icon);
+        refreshThumbnail();
-        Glide.with(getContext())
-                .load(attachment.uri)
-                .placeholder(R.drawable.attached_image_placeholder)
-                .centerCrop()
-                .into(thumbnailView);
     }
 
     @Override
@@ -124,4 +119,13 @@ public class AttachmentView extends FrameLayout implements OnClickListener, OnLo
     public void setCallback(AttachmentViewCallback callback) {
         this.callback = callback;
     }
+
+    public void refreshThumbnail() {
+        ImageView thumbnailView = (ImageView) findViewById(R.id.attachment_icon);
+        Glide.with(getContext())
+                .load(attachment.uri)
+                .placeholder(R.drawable.attached_image_placeholder)
+                .centerCrop()
+                .into(thumbnailView);
+    }
 }

k9mail/src/main/java/com/fsck/k9/ui/messageview/MessageViewFragment.java

@@ -694,6 +694,10 @@ public class MessageViewFragment extends Fragment implements ConfirmationDialogF
         });
     }
 
+    public void refreshAttachmentThumbnail(AttachmentViewInfo attachment) {
+        mMessageView.refreshAttachmentThumbnail(attachment);
+    }
+
     public interface MessageViewFragmentListener {
         public void onForward(LocalMessage mMessage, PgpData mPgpData);
         public void disableDeleteAction();

k9mail/src/main/java/com/fsck/k9/ui/messageview/SingleMessageView.java

@@ -721,6 +721,10 @@ public class SingleMessageView extends LinearLayout implements OnClickListener,
         getAttachmentView(attachment).disableButtons();
     }
 
+    public void refreshAttachmentThumbnail(AttachmentViewInfo attachment) {
+        getAttachmentView(attachment).refreshThumbnail();
+    }
+
     private AttachmentView getAttachmentView(AttachmentViewInfo attachment) {
         return attachments.get(attachment);
     }