-Added listener unregistration to local item adapters to release dependency and avoid memory leak.

-Added listener unregistration on all listeners using contexts in local item related fragments.

app/src/main/java/org/schabi/newpipe/fragments/local/LocalItemListAdapter.java

@@ -71,6 +71,10 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
         localItemBuilder.setOnItemSelectedListener(listener);
     }
 
+    public void unsetSelectedListener() {
+        localItemBuilder.setOnItemSelectedListener(null);
+    }
+
     public void addItems(List<? extends LocalItem> data) {
         if (data != null) {
             if (DEBUG) {

app/src/main/java/org/schabi/newpipe/fragments/local/LocalPlaylistFragment.java

@@ -230,6 +230,11 @@ public class LocalPlaylistFragment extends BaseLocalListFragment<List<PlaylistSt
     public void onDestroyView() {
         super.onDestroyView();
 
+        if (itemListAdapter != null) itemListAdapter.unsetSelectedListener();
+        if (headerBackgroundButton != null) headerBackgroundButton.setOnClickListener(null);
+        if (headerPlayAllButton != null) headerPlayAllButton.setOnClickListener(null);
+        if (headerPopupButton != null) headerPopupButton.setOnClickListener(null);
+
         if (databaseSubscription != null) databaseSubscription.cancel();
         if (debouncedSaver != null) debouncedSaver.dispose();
 

app/src/main/java/org/schabi/newpipe/fragments/local/PlaylistAppendDialog.java

@@ -112,6 +112,7 @@ public final class PlaylistAppendDialog extends PlaylistDialog {
     public void onDestroyView() {
         super.onDestroyView();
         if (playlistReactor != null) playlistReactor.dispose();
+        if (playlistAdapter != null) playlistAdapter.unsetSelectedListener();
 
         playlistReactor = null;
         playlistRecyclerView = null;

app/src/main/java/org/schabi/newpipe/fragments/local/bookmark/BookmarkFragment.java

@@ -178,6 +178,9 @@ public final class BookmarkFragment
     @Override
     public void onDestroyView() {
         super.onDestroyView();
+        if (mostWatchedButton != null) mostWatchedButton.setOnClickListener(null);
+        if (watchHistoryButton != null) watchHistoryButton.setOnClickListener(null);
+
         if (disposables != null) disposables.clear();
         if (databaseSubscription != null) databaseSubscription.cancel();
 

app/src/main/java/org/schabi/newpipe/fragments/local/bookmark/StatisticsPlaylistFragment.java

@@ -140,6 +140,12 @@ public abstract class StatisticsPlaylistFragment
     @Override
     public void onDestroyView() {
         super.onDestroyView();
+
+        if (itemListAdapter != null) itemListAdapter.unsetSelectedListener();
+        if (headerBackgroundButton != null) headerBackgroundButton.setOnClickListener(null);
+        if (headerPlayAllButton != null) headerPlayAllButton.setOnClickListener(null);
+        if (headerPopupButton != null) headerPopupButton.setOnClickListener(null);
+
         if (databaseSubscription != null) databaseSubscription.cancel();
         databaseSubscription = null;
     }

app/src/main/java/org/schabi/newpipe/fragments/local/holder/LocalPlaylistStreamItemHolder.java

@@ -84,7 +84,7 @@ public class LocalPlaylistStreamItemHolder extends LocalItemHolder {
     private View.OnTouchListener getOnTouchListener(final PlaylistStreamEntry item) {
         return (view, motionEvent) -> {
             view.performClick();
-            if (itemBuilder != null &&
+            if (itemBuilder != null && itemBuilder.getOnItemSelectedListener() != null &&
                     motionEvent.getActionMasked() == MotionEvent.ACTION_DOWN) {
                 itemBuilder.getOnItemSelectedListener().drag(item,
                         LocalPlaylistStreamItemHolder.this);