made the ui react on missing information

app/src/androidTest/java/org/schabi/newpipe/extractor/youtube/YoutubeStreamExtractorDefaultTest.java

@@ -3,7 +3,7 @@ package org.schabi.newpipe.services.youtube;
 import android.test.AndroidTestCase;
 
 import org.schabi.newpipe.Downloader;
-import org.schabi.newpipe.extractor.CrawlingException;
+import org.schabi.newpipe.extractor.ExctractionException;
 import org.schabi.newpipe.extractor.ParsingException;
 import org.schabi.newpipe.extractor.services.youtube.YoutubeStreamExtractor;
 import org.schabi.newpipe.extractor.VideoInfo;
@@ -33,7 +33,7 @@ import java.io.IOException;
 public class YoutubeStreamExtractorDefaultTest extends AndroidTestCase {
     private YoutubeStreamExtractor extractor;
 
-    public void setUp() throws IOException, CrawlingException {
+    public void setUp() throws IOException, ExctractionException {
         /* some anonymus video test
         extractor = new YoutubeStreamExtractor("https://www.youtube.com/watch?v=FmG385_uUys",
                 new Downloader()); */
@@ -47,7 +47,7 @@ public class YoutubeStreamExtractorDefaultTest extends AndroidTestCase {
                 extractor.getTimeStamp() <= 0);
     }
 
-    public void testGetValidTimeStamp() throws CrawlingException, IOException {
+    public void testGetValidTimeStamp() throws ExctractionException, IOException {
         YoutubeStreamExtractor extractor =
                 new YoutubeStreamExtractor("https://youtu.be/FmG385_uUys?t=174", new Downloader());
         assertTrue(Integer.toString(extractor.getTimeStamp()),

app/src/androidTest/java/org/schabi/newpipe/extractor/youtube/YoutubeStreamExtractorGemaTest.java

@@ -3,7 +3,7 @@ package org.schabi.newpipe.services.youtube;
 import android.test.AndroidTestCase;
 
 import org.schabi.newpipe.Downloader;
-import org.schabi.newpipe.extractor.CrawlingException;
+import org.schabi.newpipe.extractor.ExctractionException;
 import org.schabi.newpipe.extractor.services.youtube.YoutubeStreamExtractor;
 
 import java.io.IOException;
@@ -35,7 +35,7 @@ public class YoutubeStreamExtractorGemaTest extends AndroidTestCase {
     // Deaktivate this Test Case bevore uploading it githup, otherwise CI will fail.
     private static final boolean testActive = false;
 
-    public void testGemaError() throws IOException, CrawlingException {
+    public void testGemaError() throws IOException, ExctractionException {
         if(testActive) {
             try {
                 new YoutubeStreamExtractor("https://www.youtube.com/watch?v=3O1_3zBUKM8",

app/src/main/java/org/schabi/newpipe/VideoItemDetailFragment.java

@@ -98,7 +98,7 @@ public class VideoItemDetailFragment extends Fragment {
     private Bitmap videoThumbnail;
 
     private View thumbnailWindowLayout;
-    //this only remains dueto downwards compartiblity
+    //this only remains due to downwards compatibility
     private FloatingActionButton playVideoButton;
     private final Point initialThumbnailPos = new Point(0, 0);
 
@@ -224,11 +224,20 @@ public class VideoItemDetailFragment extends Fragment {
             Button backgroundButton = (Button)
                     activity.findViewById(R.id.detailVideoThumbnailWindowBackgroundButton);
             View topView = activity.findViewById(R.id.detailTopView);
-            View nextVideoView = videoItemViewCreator
+            View nextVideoView = null;
-                    .getViewFromVideoInfoItem(null, nextVideoFrame, info.next_video, getContext());
+            if(info.next_video != null) {
+                nextVideoView = videoItemViewCreator
+                        .getViewFromVideoInfoItem(null, nextVideoFrame, info.next_video, getContext());
+            } else {
+                activity.findViewById(R.id.detailNextVidButtonAndContentLayout).setVisibility(View.GONE);
+                activity.findViewById(R.id.detailNextVideoTitle).setVisibility(View.GONE);
+                activity.findViewById(R.id.detailNextVideoButton).setVisibility(View.GONE);
+            }
 
             progressBar.setVisibility(View.GONE);
-            nextVideoFrame.addView(nextVideoView);
+            if(nextVideoView != null) {
+                nextVideoFrame.addView(nextVideoView);
+            }
 
             initThumbnailViews(info, nextVideoFrame);
 
@@ -265,14 +274,43 @@ public class VideoItemDetailFragment extends Fragment {
                 }
             });
 
-            uploaderView.setText(info.uploader);
+            // Since newpipe is designed to work even if certain information is not available,
+            // the UI has to react on missing information.
             videoTitleView.setText(info.title);
-            uploaderView.setText(info.uploader);
+            if(!info.uploader.isEmpty()) {
-            viewCountView.setText(Localization.localizeViewCount(info.view_count, c));
+                uploaderView.setText(info.uploader);
-            thumbsUpView.setText(Localization.localizeNumber(info.like_count, c));
+            } else {
-            thumbsDownView.setText(Localization.localizeNumber(info.dislike_count, c));
+                activity.findViewById(R.id.detailUploaderWrapView).setVisibility(View.GONE);
-            uploadDateView.setText(Localization.localizeDate(info.upload_date, c));
+            }
-            descriptionView.setText(Html.fromHtml(info.description));
+            if(info.view_count >= 0) {
+                viewCountView.setText(Localization.localizeViewCount(info.view_count, c));
+            } else {
+                viewCountView.setVisibility(View.GONE);
+            }
+            if(info.dislike_count >= 0) {
+                thumbsDownView.setText(Localization.localizeNumber(info.dislike_count, c));
+            } else {
+                thumbsDownView.setVisibility(View.INVISIBLE);
+                activity.findViewById(R.id.detailThumbsDownImgView).setVisibility(View.GONE);
+            }
+            if(info.like_count >= 0) {
+                thumbsUpView.setText(Localization.localizeNumber(info.like_count, c));
+            } else {
+                thumbsUpView.setVisibility(View.GONE);
+                activity.findViewById(R.id.detailThumbsUpImgView).setVisibility(View.GONE);
+                thumbsDownView.setVisibility(View.GONE);
+                activity.findViewById(R.id.detailThumbsDownImgView).setVisibility(View.GONE);
+            }
+            if(!info.upload_date.isEmpty()) {
+                uploadDateView.setText(Localization.localizeDate(info.upload_date, c));
+            } else {
+                uploadDateView.setVisibility(View.GONE);
+            }
+            if(!info.description.isEmpty()) {
+                descriptionView.setText(Html.fromHtml(info.description));
+            } else {
+                descriptionView.setVisibility(View.GONE);
+            }
 
             descriptionView.setMovementMethod(LinkMovementMethod.getInstance());
 
@@ -299,7 +337,12 @@ public class VideoItemDetailFragment extends Fragment {
             });
             textContentLayout.setVisibility(View.VISIBLE);
 
-            initSimilarVideos(info, videoItemViewCreator);
+            if(info.related_videos != null && !info.related_videos.isEmpty()) {
+                initSimilarVideos(info, videoItemViewCreator);
+            } else {
+                activity.findViewById(R.id.detailSimilarTitle).setVisibility(View.GONE);
+                activity.findViewById(R.id.similarVideosView).setVisibility(View.GONE);
+            }
 
             if(autoPlayEnabled) {
                 playVideo(info);
@@ -335,32 +378,40 @@ public class VideoItemDetailFragment extends Fragment {
         ImageView nextVideoThumb =
                 (ImageView) nextVideoFrame.findViewById(R.id.itemThumbnailView);
 
-        imageLoader.displayImage(info.thumbnail_url, videoThumbnailView,
+        if(info.thumbnail_url != null && !info.thumbnail_url.isEmpty()) {
-                displayImageOptions, new ImageLoadingListener() {
+            imageLoader.displayImage(info.thumbnail_url, videoThumbnailView,
-                    @Override
+                    displayImageOptions, new ImageLoadingListener() {
-                    public void onLoadingStarted(String imageUri, View view) {
+                        @Override
-                    }
+                        public void onLoadingStarted(String imageUri, View view) {
+                        }
 
-                    @Override
+                        @Override
-                    public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
+                        public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
-                        Toast.makeText(VideoItemDetailFragment.this.getActivity(),
+                            Toast.makeText(VideoItemDetailFragment.this.getActivity(),
-                                R.string.could_not_load_thumbnails, Toast.LENGTH_LONG).show();
+                                    R.string.could_not_load_thumbnails, Toast.LENGTH_LONG).show();
-                        failReason.getCause().printStackTrace();
+                            failReason.getCause().printStackTrace();
-                    }
+                        }
 
-                    @Override
+                        @Override
-                    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
+                        public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
-                        videoThumbnail = loadedImage;
+                            videoThumbnail = loadedImage;
-                    }
+                        }
 
-                    @Override
+                        @Override
-                    public void onLoadingCancelled(String imageUri, View view) {
+                        public void onLoadingCancelled(String imageUri, View view) {
-                    }
+                        }
-                });
+                    });
-        imageLoader.displayImage(info.uploader_thumbnail_url,
+        } else {
-                uploaderThumb, displayImageOptions, new ThumbnailLoadingListener());
+            videoThumbnailView.setImageResource(R.drawable.dummy_thumbnail_dark);
-        imageLoader.displayImage(info.next_video.thumbnail_url,
+        }
-                nextVideoThumb, displayImageOptions, new ThumbnailLoadingListener());
+        if(info.uploader_thumbnail_url != null && !info.uploader_thumbnail_url.isEmpty()) {
+            imageLoader.displayImage(info.uploader_thumbnail_url,
+                    uploaderThumb, displayImageOptions, new ThumbnailLoadingListener());
+        }
+        if(info.thumbnail_url != null && !info.thumbnail_url.isEmpty()) {
+            imageLoader.displayImage(info.next_video.thumbnail_url,
+                    nextVideoThumb, displayImageOptions, new ThumbnailLoadingListener());
+        }
     }
 
     private void setupActionBarHandler(final VideoInfo info) {

app/src/main/java/org/schabi/newpipe/VideoItemListFragment.java

@@ -16,7 +16,7 @@ import android.widget.Toast;
 import java.io.IOException;
 import java.util.List;
 
-import org.schabi.newpipe.extractor.CrawlingException;
+import org.schabi.newpipe.extractor.ExctractionException;
 import org.schabi.newpipe.extractor.VideoPreviewInfo;
 import org.schabi.newpipe.extractor.SearchEngine;
 import org.schabi.newpipe.extractor.StreamingService;
@@ -115,7 +115,7 @@ public class VideoItemListFragment extends ListFragment {
             } catch(IOException e) {
                 postNewErrorToast(h, R.string.network_error);
                 e.printStackTrace();
-            } catch(CrawlingException ce) {
+            } catch(ExctractionException ce) {
                 postNewErrorToast(h, R.string.parsing_error);
                 ce.printStackTrace();
             } catch(Exception e) {

app/src/main/java/org/schabi/newpipe/extractor/ExctractionException.java

@@ -4,7 +4,7 @@ package org.schabi.newpipe.extractor;
  * Created by Christian Schabesberger on 30.01.16.
  *
  * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
- * CrawlingException.java is part of NewPipe.
+ * ExctractionException.java is part of NewPipe.
  *
  * NewPipe is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -20,18 +20,18 @@ package org.schabi.newpipe.extractor;
  * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-public class CrawlingException extends Exception {
+public class ExctractionException extends Exception {
-    public CrawlingException() {}
+    public ExctractionException() {}
 
-    public CrawlingException(String message) {
+    public ExctractionException(String message) {
         super(message);
     }
 
-    public CrawlingException(Throwable cause) {
+    public ExctractionException(Throwable cause) {
         super(cause);
     }
 
-    public CrawlingException(String message, Throwable cause) {
+    public ExctractionException(String message, Throwable cause) {
         super(message, cause);
     }
 }

app/src/main/java/org/schabi/newpipe/extractor/ParsingException.java

@@ -21,7 +21,7 @@ package org.schabi.newpipe.extractor;
  */
 
 
-public class ParsingException extends CrawlingException {
+public class ParsingException extends ExctractionException {
     public ParsingException() {}
     public ParsingException(String message) {
         super(message);

app/src/main/java/org/schabi/newpipe/extractor/SearchEngine.java

@@ -34,9 +34,9 @@ public interface SearchEngine {
     }
 
     ArrayList<String> suggestionList(String query, Downloader dl)
-            throws CrawlingException, IOException;
+            throws ExctractionException, IOException;
 
     //Result search(String query, int page);
     Result search(String query, int page, String contentCountry, Downloader dl)
-            throws CrawlingException, IOException;
+            throws ExctractionException, IOException;
 }

app/src/main/java/org/schabi/newpipe/extractor/StreamExtractor.java

@@ -28,7 +28,7 @@ import java.util.List;
 @SuppressWarnings("ALL")
 public interface StreamExtractor {
 
-    public class ExctractorInitException extends CrawlingException {
+    public class ExctractorInitException extends ExctractionException {
         public ExctractorInitException() {}
         public ExctractorInitException(String message) {
             super(message);

app/src/main/java/org/schabi/newpipe/extractor/StreamingService.java

@@ -28,7 +28,7 @@ public interface StreamingService {
     }
     ServiceInfo getServiceInfo();
     StreamExtractor getExtractorInstance(String url, Downloader downloader)
-            throws IOException, CrawlingException;
+            throws IOException, ExctractionException;
     SearchEngine getSearchEngineInstance();
 
     VideoUrlIdHandler getUrlIdHandler();

app/src/main/java/org/schabi/newpipe/extractor/VideoInfo.java

@@ -31,33 +31,54 @@ public class VideoInfo extends AbstractVideoInfo {
     /**Fills out the video info fields which are common to all services.
      * Probably needs to be overridden by subclasses*/
     public static VideoInfo getVideoInfo(StreamExtractor extractor, Downloader downloader)
-            throws CrawlingException, IOException {
+            throws ExctractionException, IOException {
         VideoInfo videoInfo = new VideoInfo();
 
+        videoInfo = extractImportantData(videoInfo, extractor, downloader);
+        videoInfo = extractStreams(videoInfo, extractor, downloader);
+        videoInfo = extractOptionalData(videoInfo, extractor, downloader);
+
+        return videoInfo;
+    }
+
+    private static VideoInfo extractImportantData(
+            VideoInfo videoInfo, StreamExtractor extractor, Downloader downloader)
+            throws ExctractionException, IOException {
+        /* ---- importand data, withoug the video can't be displayed goes here: ---- */
+        // if one of these is not available an exception is ment to be thrown directly into the frontend.
+
         VideoUrlIdHandler uiconv = extractor.getUrlIdConverter();
 
-
         videoInfo.webpage_url = extractor.getPageUrl();
-        videoInfo.title = extractor.getTitle();
-        videoInfo.duration = extractor.getLength();
-        videoInfo.uploader = extractor.getUploader();
-        videoInfo.description = extractor.getDescription();
-        videoInfo.view_count = extractor.getViews();
-        videoInfo.upload_date = extractor.getUploadDate();
-        videoInfo.thumbnail_url = extractor.getThumbnailUrl();
         videoInfo.id = uiconv.getVideoId(extractor.getPageUrl());
-        //todo: make this quick and dirty solution a real fallback
+        videoInfo.title = extractor.getTitle();
-        // The front end should be notified that the dash mpd could not be downloaded
+
-        // although not getting the dash mpd is not the end of the world, therfore
+        if((videoInfo.webpage_url == null || videoInfo.webpage_url.isEmpty())
-        // we continue.
+                || (videoInfo.id == null || videoInfo.id.isEmpty())
+                || (videoInfo.title == null /* videoInfo.title can be empty of course */));
+
+        return videoInfo;
+    }
+
+    private static VideoInfo extractStreams(
+            VideoInfo videoInfo, StreamExtractor extractor, Downloader downloader)
+            throws ExctractionException, IOException {
+        /* ---- stream extraction goes here ---- */
+        // At least one type of stream has to be available,
+        // otherwise an exception will be thrown directly into the frontend.
+
         try {
             videoInfo.dashMpdUrl = extractor.getDashMpdUrl();
         } catch(Exception e) {
-            e.printStackTrace();
+            videoInfo.addException(new ExctractionException("Couldn't get Dash manifest", e));
         }
 
-        /** Load and extract audio*/
+        /*  Load and extract audio */
-        videoInfo.audio_streams = extractor.getAudioStreams();
+        try {
+            videoInfo.audio_streams = extractor.getAudioStreams();
+        } catch(Exception e) {
+            videoInfo.addException(new ExctractionException("Couldn't get audio streams", e));
+        }
         // also try to get streams from the dashMpd
         if(videoInfo.dashMpdUrl != null && !videoInfo.dashMpdUrl.isEmpty()) {
             if(videoInfo.audio_streams == null) {
@@ -69,28 +90,115 @@ public class VideoInfo extends AbstractVideoInfo {
                 videoInfo.audio_streams.addAll(
                         DashMpdParser.getAudioStreams(videoInfo.dashMpdUrl, downloader));
             } catch(Exception e) {
-                e.printStackTrace();
+                videoInfo.addException(
+                        new ExctractionException("Couldn't get audio streams from dash mpd", e));
             }
         }
-        /** Extract video stream url*/
+        /* Extract video stream url*/
-        videoInfo.video_streams = extractor.getVideoStreams();
+        try {
-        /** Extract video only stream url*/
+            videoInfo.video_streams = extractor.getVideoStreams();
-        videoInfo.video_only_streams = extractor.getVideoOnlyStreams();
+        } catch (Exception e) {
-        videoInfo.uploader_thumbnail_url = extractor.getUploaderThumbnailUrl();
+            videoInfo.addException(
-        videoInfo.start_position = extractor.getTimeStamp();
+                    new ExctractionException("Couldn't get video streams", e));
-        videoInfo.average_rating = extractor.getAverageRating();
+        }
-        videoInfo.like_count = extractor.getLikeCount();
+        /* Extract video only stream url*/
-        videoInfo.dislike_count = extractor.getDislikeCount();
+        try {
-        videoInfo.next_video = extractor.getNextVideo();
+            videoInfo.video_only_streams = extractor.getVideoOnlyStreams();
-        videoInfo.related_videos = extractor.getRelatedVideos();
+        } catch(Exception e) {
+            videoInfo.addException(
+                    new ExctractionException("Couldn't get video only streams", e));
+        }
+
+        // either dash_mpd audio_only or video has to be available, otherwise we didn't get a stream,
+        // and therefore failed. (Since video_only_streams are just optional they don't caunt).
+        if((videoInfo.video_streams == null || videoInfo.video_streams.isEmpty())
+                && (videoInfo.audio_streams == null || videoInfo.audio_streams.isEmpty())
+                && (videoInfo.dashMpdUrl == null || videoInfo.dashMpdUrl.isEmpty())) {
+            throw new ExctractionException("Could not get any stream. See error variable to get further details.");
+        }
 
         return videoInfo;
     }
 
+    private static VideoInfo extractOptionalData(
+            VideoInfo videoInfo, StreamExtractor extractor, Downloader downloader) {
+        /*  ---- optional data goes here: ---- */
+        // If one of these failes, the frontend neets to handle that they are not available.
+        // Exceptions are therfore not thrown into the frontend, but stored into the error List,
+        // so the frontend can afterwads check where errors happend.
+
+        try {
+            videoInfo.thumbnail_url = extractor.getThumbnailUrl();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.duration = extractor.getLength();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.uploader = extractor.getUploader();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.description = extractor.getDescription();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.view_count = extractor.getViews();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.upload_date = extractor.getUploadDate();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.uploader_thumbnail_url = extractor.getUploaderThumbnailUrl();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.start_position = extractor.getTimeStamp();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.average_rating = extractor.getAverageRating();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.like_count = extractor.getLikeCount();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.dislike_count = extractor.getDislikeCount();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.next_video = extractor.getNextVideo();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+        try {
+            videoInfo.related_videos = extractor.getRelatedVideos();
+        } catch(Exception e) {
+            videoInfo.addException(e);
+        }
+
+        return videoInfo;
+    }
 
     public String uploader_thumbnail_url = "";
     public String description = "";
-    /*todo: make this lists over vectors*/
+
     public List<VideoStream> video_streams = null;
     public List<AudioStream> audio_streams = null;
     public List<VideoStream> video_only_streams = null;
@@ -101,8 +209,6 @@ public class VideoInfo extends AbstractVideoInfo {
     public String dashMpdUrl = "";
     public int duration = -1;
 
-    /*YouTube-specific fields
-    todo: move these to a subclass*/
     public int age_limit = 0;
     public int like_count = -1;
     public int dislike_count = -1;
@@ -113,6 +219,8 @@ public class VideoInfo extends AbstractVideoInfo {
     public int start_position = 0;
     //todo: public int service_id = -1;
 
+    public List<Exception> errors = new Vector<>();
+
     public VideoInfo() {}
 
     /**Creates a new VideoInfo object from an existing AbstractVideoInfo.
@@ -187,4 +295,8 @@ public class VideoInfo extends AbstractVideoInfo {
                     && url == cmp.url;
         }
     }
+
+    public void addException(Exception e) {
+        errors.add(e);
+    }
 }

app/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeService.java

@@ -1,6 +1,6 @@
 package org.schabi.newpipe.extractor.services.youtube;
 
-import org.schabi.newpipe.extractor.CrawlingException;
+import org.schabi.newpipe.extractor.ExctractionException;
 import org.schabi.newpipe.extractor.Downloader;
 import org.schabi.newpipe.extractor.StreamExtractor;
 import org.schabi.newpipe.extractor.StreamingService;
@@ -39,7 +39,7 @@ public class YoutubeService implements StreamingService {
     }
     @Override
     public StreamExtractor getExtractorInstance(String url, Downloader downloader)
-            throws CrawlingException, IOException {
+            throws ExctractionException, IOException {
         VideoUrlIdHandler urlIdHandler = new YoutubeVideoUrlIdHandler();
         if(urlIdHandler.acceptUrl(url)) {
             return new YoutubeStreamExtractor(url, downloader) ;

app/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeStreamExtractor.java

@@ -10,7 +10,7 @@ import org.jsoup.nodes.Element;
 import org.mozilla.javascript.Context;
 import org.mozilla.javascript.Function;
 import org.mozilla.javascript.ScriptableObject;
-import org.schabi.newpipe.extractor.CrawlingException;
+import org.schabi.newpipe.extractor.ExctractionException;
 import org.schabi.newpipe.extractor.Downloader;
 import org.schabi.newpipe.extractor.Parser;
 import org.schabi.newpipe.extractor.ParsingException;
@@ -173,7 +173,7 @@ public class YoutubeStreamExtractor implements StreamExtractor {
 
     private Downloader downloader;
 
-    public YoutubeStreamExtractor(String pageUrl, Downloader dl) throws CrawlingException, IOException {
+    public YoutubeStreamExtractor(String pageUrl, Downloader dl) throws ExctractionException, IOException {
         //most common videoInfo fields are now set in our superclass, for all services
         downloader = dl;
         this.pageUrl = pageUrl;

app/src/main/res/layout-v18/fragment_videoitem_detail.xml

@@ -266,10 +266,10 @@
                         android:layout_below="@id/detailNextVidButtonAndContentLayout"
                         android:textAllCaps="true" />
                     <LinearLayout
+                        android:id="@+id/similarVideosView"
                         android:orientation="vertical"
                         android:layout_width="match_parent"
                         android:layout_height="match_parent"
-                        android:id="@+id/similarVideosView"
                         android:layout_below="@id/detailSimilarTitle">
                     </LinearLayout>
                 </RelativeLayout>