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Co-Authored-By:  Audric V <74829229+AudricV@users.noreply.github.com>

app/src/main/java/org/schabi/newpipe/fragments/detail/BaseDescriptionFragment.java

@@ -34,7 +34,7 @@ import java.util.List;
 import io.reactivex.rxjava3.disposables.CompositeDisposable;
 
 public abstract class BaseDescriptionFragment extends BaseFragment {
-    final CompositeDisposable descriptionDisposables = new CompositeDisposable();
+    private final CompositeDisposable descriptionDisposables = new CompositeDisposable();
     protected FragmentDescriptionBinding binding;
 
     @Override
@@ -75,7 +75,7 @@ public abstract class BaseDescriptionFragment extends BaseFragment {
     protected abstract int getServiceId();
 
     /**
-     * Get the URL of the described video. Used for generating description links.
+     * Get the URL of the described video or audio, used to generate description links.
      * @return stream URL
      */
     @Nullable

app/src/main/java/org/schabi/newpipe/fragments/detail/DescriptionFragment.java

@@ -52,6 +52,9 @@ public class DescriptionFragment extends BaseDescriptionFragment {
 
     @Override
     protected int getServiceId() {
+        if (streamInfo == null) {
+            return -1;
+        }
         return streamInfo.getServiceId();
     }
 
@@ -76,13 +79,17 @@ public class DescriptionFragment extends BaseDescriptionFragment {
     @Override
     protected void setupMetadata(final LayoutInflater inflater,
                                  final LinearLayout layout) {
-        if (streamInfo.getUploadDate() != null) {
+        if (streamInfo != null && streamInfo.getUploadDate() != null) {
             binding.detailUploadDateView.setText(Localization
                     .localizeUploadDate(activity, streamInfo.getUploadDate().offsetDateTime()));
         } else {
             binding.detailUploadDateView.setVisibility(View.GONE);
         }
 
+        if (streamInfo == null) {
+            return;
+        }
+
         addMetadataItem(inflater, layout, false, R.string.metadata_category,
                 streamInfo.getCategory());
 

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListInfoFragment.java

@@ -233,8 +233,6 @@ public abstract class BaseListInfoFragment<I extends InfoItem, L extends ListInf
                 showListFooter(hasMoreItems());
             } else {
                 infoListAdapter.clearStreamItemList();
-                // showEmptyState should be called only if there is no item as
-                // well as no header in infoListAdapter
                 showEmptyState();
             }
         }

app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelAboutFragment.java

@@ -62,6 +62,9 @@ public class ChannelAboutFragment extends BaseDescriptionFragment {
 
     @Override
     protected int getServiceId() {
+        if (channelInfo == null) {
+            return -1;
+        }
         return channelInfo.getServiceId();
     }
 
@@ -83,10 +86,14 @@ public class ChannelAboutFragment extends BaseDescriptionFragment {
     @Override
     protected void setupMetadata(final LayoutInflater inflater,
                                  final LinearLayout layout) {
-        final Context context = getContext();
         // There is no upload date available for channels, so hide the relevant UI element
         binding.detailUploadDateView.setVisibility(View.GONE);
 
+        if (channelInfo == null) {
+            return;
+        }
+
+        final Context context = getContext();
         if (channelInfo.getSubscriberCount() != UNKNOWN_SUBSCRIBER_COUNT) {
             addMetadataItem(inflater, layout, false, R.string.metadata_subscribers,
                     Localization.localizeNumber(context, channelInfo.getSubscriberCount()));

app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelFragment.java

@@ -125,7 +125,7 @@ public class ChannelFragment extends BaseStateFragment<ChannelInfo>
     }
 
     @Override
-    public void onAttach(final @NonNull Context context) {
+    public void onAttach(@NonNull final Context context) {
         super.onAttach(context);
         subscriptionManager = new SubscriptionManager(activity);
     }
@@ -138,7 +138,7 @@ public class ChannelFragment extends BaseStateFragment<ChannelInfo>
         return binding.getRoot();
     }
 
-    @Override // called from onViewCreated in {@link BaseFragment#onViewCreated}
+    @Override // called from onViewCreated in BaseFragment.onViewCreated
     protected void initViews(final View rootView, final Bundle savedInstanceState) {
         super.initViews(rootView, savedInstanceState);
 
@@ -202,7 +202,7 @@ public class ChannelFragment extends BaseStateFragment<ChannelInfo>
     }
 
     @Override
-    public void onPrepareOptionsMenu(final @NonNull Menu menu) {
+    public void onPrepareOptionsMenu(@NonNull final Menu menu) {
         super.onPrepareOptionsMenu(menu);
         menuRssButton = menu.findItem(R.id.menu_item_rss);
         menuNotifyButton = menu.findItem(R.id.menu_item_notify);
@@ -210,7 +210,7 @@ public class ChannelFragment extends BaseStateFragment<ChannelInfo>
     }
 
     @Override
-    public boolean onOptionsItemSelected(final MenuItem item) {
+    public boolean onOptionsItemSelected(@NonNull final MenuItem item) {
         switch (item.getItemId()) {
             case R.id.menu_item_notify:
                 final boolean value = !item.isChecked();
@@ -561,8 +561,8 @@ public class ChannelFragment extends BaseStateFragment<ChannelInfo>
                 .subscribe(result -> {
                     isLoading.set(false);
                     handleResult(result);
-                }, throwable -> showError(new ErrorInfo(throwable, UserAction.REQUESTED_STREAM,
-                        url == null ? "no url" : url, serviceId)));
+                }, throwable -> showError(new ErrorInfo(throwable, UserAction.REQUESTED_CHANNEL,
+                        url == null ? "No URL" : url, serviceId)));
     }
 
     @Override

app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelTabFragment.java

@@ -34,12 +34,15 @@ import io.reactivex.rxjava3.core.Single;
 public class ChannelTabFragment extends BaseListInfoFragment<InfoItem, ChannelTabInfo>
         implements PlaylistControlViewHolder {
 
+    // states must be protected and not private for IcePick being able to access them
     @State
     protected ListLinkHandler tabHandler;
     @State
     protected String channelName;
 
     private PlaylistControlBinding playlistControlBinding;
+
+    @NonNull
     public static ChannelTabFragment getInstance(final int serviceId,
                                                  final ListLinkHandler tabHandler,
                                                  final String channelName) {
@@ -99,11 +102,16 @@ public class ChannelTabFragment extends BaseListInfoFragment<InfoItem, ChannelTa
 
     @Override
     public void setTitle(final String title) {
+        // The channel name is displayed as title in the toolbar.
+        // The title is always a description of the content of the tab fragment.
+        // It should be unique for each channel because multiple channel tabs
+        // can be added to the main page. Therefore, the channel name is used.
+        // Using the title variable would cause the title to be the same for all channel tabs.
         super.setTitle(channelName);
     }
 
     @Override
-    public void handleResult(final @NonNull ChannelTabInfo result) {
+    public void handleResult(@NonNull final ChannelTabInfo result) {
         super.handleResult(result);
 
         if (playlistControlBinding != null) {

app/src/main/java/org/schabi/newpipe/fragments/list/playlist/PlaylistControlViewHolder.java

@@ -7,7 +7,5 @@ import org.schabi.newpipe.player.playqueue.PlayQueue;
  * to give access to the play queue.
  */
 public interface PlaylistControlViewHolder {
-
     PlayQueue getPlayQueue();
-
 }

app/src/main/java/org/schabi/newpipe/local/feed/service/FeedLoadManager.kt

@@ -140,8 +140,7 @@ class FeedLoadManager(private val context: Context) {
         subscriptionEntity: SubscriptionEntity,
         useFeedExtractor: Boolean,
         defaultSharedPreferences: SharedPreferences
-    ):
-        Notification<FeedUpdateInfo> {
+    ): Notification<FeedUpdateInfo> {
         var error: Throwable? = null
         val storeOriginalErrorAndRethrow = { e: Throwable ->
             // keep original to prevent blockingGet() from wrapping it into RuntimeException

app/src/main/java/org/schabi/newpipe/player/playqueue/AbstractInfoPlayQueue.java

@@ -29,9 +29,12 @@ abstract class AbstractInfoPlayQueue<T extends ListInfo<? extends InfoItem>>
 
     protected AbstractInfoPlayQueue(final T info) {
         this(info.getServiceId(), info.getUrl(), info.getNextPage(),
-                info.getRelatedItems().stream().filter(StreamInfoItem.class::isInstance)
-                        .map(StreamInfoItem.class::cast).collect(
-                                Collectors.toList()), 0);
+                info.getRelatedItems()
+                        .stream()
+                        .filter(StreamInfoItem.class::isInstance)
+                        .map(StreamInfoItem.class::cast)
+                        .collect(Collectors.toList()),
+                0);
     }
 
     protected AbstractInfoPlayQueue(final int serviceId,
@@ -76,10 +79,11 @@ abstract class AbstractInfoPlayQueue<T extends ListInfo<? extends InfoItem>>
                 }
                 nextPage = result.getNextPage();
 
-                append(extractListItems(result.getRelatedItems().stream()
+                append(extractListItems(result.getRelatedItems()
+                        .stream()
                         .filter(StreamInfoItem.class::isInstance)
-                        .map(StreamInfoItem.class::cast).collect(
-                                Collectors.toList())));
+                        .map(StreamInfoItem.class::cast)
+                        .collect(Collectors.toList())));
 
                 fetchReactor.dispose();
                 fetchReactor = null;
@@ -114,10 +118,11 @@ abstract class AbstractInfoPlayQueue<T extends ListInfo<? extends InfoItem>>
                 }
                 nextPage = result.getNextPage();
 
-                append(extractListItems(result.getItems().stream()
+                append(extractListItems(result.getItems()
+                        .stream()
                         .filter(StreamInfoItem.class::isInstance)
-                        .map(StreamInfoItem.class::cast).collect(
-                                Collectors.toList())));
+                        .map(StreamInfoItem.class::cast)
+                        .collect(Collectors.toList())));
 
                 fetchReactor.dispose();
                 fetchReactor = null;

app/src/main/java/org/schabi/newpipe/util/ExtractorHelper.java

@@ -135,9 +135,9 @@ public final class ExtractorHelper {
                         ChannelTabInfo.getInfo(NewPipe.getService(serviceId), listLinkHandler)));
     }
 
-    public static Single<InfoItemsPage<InfoItem>> getMoreChannelTabItems(final int serviceId,
-                                                                         final ListLinkHandler
-                                                                                 listLinkHandler,
+    public static Single<InfoItemsPage<InfoItem>> getMoreChannelTabItems(
+            final int serviceId,
+            final ListLinkHandler listLinkHandler,
             final Page nextPage) {
         checkServiceId(serviceId);
         return Single.fromCallable(() ->

app/src/main/java/org/schabi/newpipe/util/PlayButtonHelper.java

@@ -22,13 +22,13 @@ public final class PlayButtonHelper {
     }
 
     /**
-     * <p>Initialize {@link android.view.View.OnClickListener OnClickListener}
+     * Initialize {@link android.view.View.OnClickListener OnClickListener}
      * and {@link android.view.View.OnLongClickListener OnLongClickListener} for playlist control
-     * buttons defined in {@code R.layout.playlist_control}.</p>
+     * buttons defined in {@link R.layout#playlist_control}.
      *
      * @param activity The activity to use for the {@link android.widget.Toast Toast}.
      * @param playlistControlBinding The binding of the
-     *        {@link R.layout.playlist_control playlist control layout}.
+     *        {@link R.layout#playlist_control playlist control layout}.
      * @param fragment The fragment to get the play queue from.
      */
     public static void initPlaylistControlClickListener(
@@ -61,7 +61,7 @@ public final class PlayButtonHelper {
     }
 
     /**
-     * <p>Show the "hold to append" toast if the corresponding preference is enabled.</p>
+     * Show the "hold to append" toast if the corresponding preference is enabled.
      *
      * @param context The context to show the toast.
      */
@@ -73,7 +73,7 @@ public final class PlayButtonHelper {
     }
 
     /**
-     * <p>Check if the "hold to append" toast should be shown.</p>
+     * Check if the "hold to append" toast should be shown.
      *
      * <p>
      * The tip is shown if the corresponding preference is enabled.