Add loader when waiting to display a media

app/src/main/java/com/keylesspalace/tusky/ViewVideoActivity.java

@@ -20,13 +20,16 @@ import android.os.Bundle;
 import android.support.v7.app.ActionBar;
 import android.support.v7.widget.Toolbar;
 import android.view.MenuItem;
+import android.view.View;
 import android.widget.MediaController;
+import android.widget.ProgressBar;
 import android.widget.VideoView;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
 
 public class ViewVideoActivity extends BaseActivity {
+    @BindView(R.id.video_progress) ProgressBar progressBar;
     @BindView(R.id.video_player) VideoView videoView;
     @BindView(R.id.toolbar) Toolbar toolbar;
 
@@ -56,6 +59,7 @@ public class ViewVideoActivity extends BaseActivity {
         videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
             @Override
             public void onPrepared(MediaPlayer mp) {
+                progressBar.setVisibility(View.GONE);
                 mp.setLooping(true);
             }
         });

app/src/main/java/com/keylesspalace/tusky/fragment/ViewMediaFragment.java

@@ -82,7 +82,7 @@ public class ViewMediaFragment extends DialogFragment {
     @Override
     public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                              Bundle savedInstanceState) {
-        View rootView = inflater.inflate(R.layout.fragment_view_media, container, false);
+        final View rootView = inflater.inflate(R.layout.fragment_view_media, container, false);
         ButterKnife.bind(this, rootView);
 
         Bundle arguments = getArguments();
@@ -141,6 +141,7 @@ public class ViewMediaFragment extends DialogFragment {
                 .into(photoView, new Callback() {
                     @Override
                     public void onSuccess() {
+                        rootView.findViewById(R.id.view_media_progress).setVisibility(View.GONE);
                         attacher.update();
                     }
 

app/src/main/res/layout/activity_view_video.xml

@@ -14,6 +14,11 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_centerInParent="true" />
+    <ProgressBar
+        android:id="@+id/video_progress"
+        android:layout_gravity="center"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
     <android.support.v7.widget.Toolbar
         android:id="@+id/toolbar"
         android:layout_width="match_parent"

app/src/main/res/layout/fragment_view_media.xml

@@ -5,6 +5,11 @@
     android:clickable="true"
     android:layout_gravity="center"
     android:background="@android:color/black">
+    <ProgressBar
+        android:id="@+id/view_media_progress"
+        android:layout_gravity="center"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
     <uk.co.senab.photoview.PhotoView
         android:id="@+id/view_media_image"
         android:layout_width="match_parent"