show progress while loading media files

src/main/java/de/pixart/messenger/ui/MediaBrowserActivity.java

@@ -51,6 +51,8 @@ public class MediaBrowserActivity extends XmppActivity implements OnMediaLoaded
         mMediaAdapter = new MediaAdapter(this, R.dimen.media_size);
         this.binding.media.setAdapter(mMediaAdapter);
         GridManager.setupLayoutManager(this, this.binding.media, R.dimen.browser_media_size);
+        this.binding.noMedia.setVisibility(View.GONE);
+        this.binding.progressbar.setVisibility(View.VISIBLE);
     }
 
     @Override
@@ -74,8 +76,10 @@ public class MediaBrowserActivity extends XmppActivity implements OnMediaLoaded
             if (attachments.size() > 0) {
                 mMediaAdapter.setAttachments(attachments);
                 this.binding.noMedia.setVisibility(View.GONE);
+                this.binding.progressbar.setVisibility(View.GONE);
             } else {
                 this.binding.noMedia.setVisibility(View.VISIBLE);
+                this.binding.progressbar.setVisibility(View.GONE);
             }
         });
     }

src/main/res/layout/activity_media_browser.xml

@@ -20,6 +20,21 @@
             android:padding="2dp"
             android:scrollbars="vertical" />
 
+        <RelativeLayout
+            android:id="@+id/progressbar"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent">
+
+            <ProgressBar
+                style="?android:attr/progressBarStyleLarge"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_centerInParent="true"
+                android:layout_centerHorizontal="true"
+                android:layout_centerVertical="true"
+                android:gravity="center" />
+        </RelativeLayout>
+
         <TextView
             android:id="@+id/no_media"
             android:layout_width="match_parent"

src/main/res/menu/fragment_conversation.xml

@@ -98,7 +98,7 @@
     <item
         android:id="@+id/action_mediabrowser"
         android:icon="@drawable/ic_image_white_24dp"
-        android:orderInCategory="100"
+        android:orderInCategory="1"
         android:title="@string/media_browser"
         app:showAsAction="always" />
 </menu>