Merge pull request #4020 from ebraminio/rtl

Adopt the project with ViewPager2 

19 files changed, 370 insertions, 232 deletions

diff --git a/app/build.gradle b/app/build.gradle
index 6fb84c29a..b400b8700 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -142,6 +142,7 @@ dependencies {
     implementation "androidx.preference:preference:1.1.0"
     implementation "androidx.gridlayout:gridlayout:1.0.0"
     implementation "androidx.recyclerview:recyclerview:1.1.0"
+    implementation "androidx.viewpager2:viewpager2:1.0.0"
     implementation "androidx.coordinatorlayout:coordinatorlayout:1.1.0"
     implementation "androidx.media:media:1.1.0"
     implementation "androidx.work:work-runtime:$workManagerVersion"
diff --git a/app/src/main/java/com/google/android/material/bottomsheet/ViewPagerBottomSheetBehavior.java b/app/src/main/java/com/google/android/material/bottomsheet/ViewPagerBottomSheetBehavior.java
index 1667006a5..9ed4897d2 100644
--- a/app/src/main/java/com/google/android/material/bottomsheet/ViewPagerBottomSheetBehavior.java
+++ b/app/src/main/java/com/google/android/material/bottomsheet/ViewPagerBottomSheetBehavior.java
@@ -4,8 +4,10 @@ import android.content.Context;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.ViewGroup;
+
 import androidx.core.view.ViewCompat;
-import androidx.viewpager.widget.ViewPager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.viewpager2.widget.ViewPager2;
 
 import java.lang.ref.WeakReference;
 
@@ -31,9 +33,10 @@ public class ViewPagerBottomSheetBehavior<V extends View> extends BottomSheetBeh
             return view;
         }
 
-        if (view instanceof ViewPager) {
-            ViewPager viewPager = (ViewPager) view;
-            View currentViewPagerChild = viewPager.getChildAt(viewPager.getCurrentItem());
+        if (view instanceof ViewPager2) {
+            ViewPager2 viewPager = (ViewPager2) view;
+            RecyclerView recycler = (RecyclerView) viewPager.getChildAt(0);
+            View currentViewPagerChild = recycler.getChildAt(viewPager.getCurrentItem());
             if (currentViewPagerChild != null) {
                 return findScrollingChild(currentViewPagerChild);
             }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/AudioPlayerFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/AudioPlayerFragment.java
index 7f0326019..e905ccd95 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/AudioPlayerFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/AudioPlayerFragment.java
@@ -13,20 +13,28 @@ import android.widget.ImageButton;
 import android.widget.ProgressBar;
 import android.widget.SeekBar;
 import android.widget.TextView;
+
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.widget.Toolbar;
 import androidx.fragment.app.Fragment;
-import androidx.fragment.app.FragmentManager;
-import androidx.fragment.app.FragmentPagerAdapter;
-import androidx.viewpager.widget.ViewPager;
+import androidx.viewpager2.adapter.FragmentStateAdapter;
+import androidx.viewpager2.widget.ViewPager2;
+
 import com.google.android.material.bottomsheet.BottomSheetBehavior;
+
+import org.greenrobot.eventbus.EventBus;
+import org.greenrobot.eventbus.Subscribe;
+import org.greenrobot.eventbus.ThreadMode;
+
+import java.text.DecimalFormat;
+
 import de.danoeh.antennapod.R;
 import de.danoeh.antennapod.activity.CastEnabledActivity;
 import de.danoeh.antennapod.activity.MainActivity;
 import de.danoeh.antennapod.core.event.FavoritesEvent;
 import de.danoeh.antennapod.core.event.PlaybackPositionEvent;
-import de.danoeh.antennapod.core.feed.Chapter;
 import de.danoeh.antennapod.core.feed.FeedItem;
 import de.danoeh.antennapod.core.feed.FeedMedia;
 import de.danoeh.antennapod.core.feed.util.PlaybackSpeedUtils;
@@ -50,12 +58,6 @@ import io.reactivex.Maybe;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.Disposable;
 import io.reactivex.schedulers.Schedulers;
-import org.greenrobot.eventbus.EventBus;
-import org.greenrobot.eventbus.Subscribe;
-import org.greenrobot.eventbus.ThreadMode;
-
-import java.text.DecimalFormat;
-import java.util.List;
 
 /**
  * Shows the audio player.
@@ -73,7 +75,7 @@ public class AudioPlayerFragment extends Fragment implements
 
     PlaybackSpeedIndicatorView butPlaybackSpeed;
     TextView txtvPlaybackSpeed;
-    private ViewPager pager;
+    private ViewPager2 pager;
     private PagerIndicatorView pageIndicator;
     private TextView txtvPosition;
     private TextView txtvLength;
@@ -127,11 +129,10 @@ public class AudioPlayerFragment extends Fragment implements
         sbPosition.setOnSeekBarChangeListener(this);
 
         pager = root.findViewById(R.id.pager);
-        AudioPlayerPagerAdapter pagerAdapter = new AudioPlayerPagerAdapter(getChildFragmentManager());
-        pager.setAdapter(pagerAdapter);
+        pager.setAdapter(new AudioPlayerPagerAdapter(this));
         // Required for getChildAt(int) in ViewPagerBottomSheetBehavior to return the correct page
-        pager.setOffscreenPageLimit(NUM_CONTENT_FRAGMENTS);
-        pager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
+        pager.setOffscreenPageLimit((int) NUM_CONTENT_FRAGMENTS);
+        pager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
             @Override
             public void onPageSelected(int position) {
                 pager.post(() -> ((MainActivity) getActivity()).getBottomSheet().updateScrollingChild());
@@ -502,30 +503,30 @@ public class AudioPlayerFragment extends Fragment implements
         return false;
     }
 
-    private static class AudioPlayerPagerAdapter extends FragmentPagerAdapter {
+    private static class AudioPlayerPagerAdapter extends FragmentStateAdapter {
         private static final String TAG = "AudioPlayerPagerAdapter";
 
-        public AudioPlayerPagerAdapter(FragmentManager fm) {
-            super(fm);
+        public AudioPlayerPagerAdapter(@NonNull Fragment fragment) {
+            super(fragment);
         }
 
+        @NonNull
         @Override
-        public Fragment getItem(int position) {
+        public Fragment createFragment(int position) {
             Log.d(TAG, "getItem(" + position + ")");
             switch (position) {
                 case POS_COVER:
                     return new CoverFragment();
                 case POS_DESCR:
                     return new ItemDescriptionFragment();
+                default:
                 case POS_CHAPTERS:
                     return new ChaptersFragment();
-                default:
-                    return null;
             }
         }
 
         @Override
-        public int getCount() {
+        public int getItemCount() {
             return NUM_CONTENT_FRAGMENTS;
         }
     }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/CompletedDownloadsFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/CompletedDownloadsFragment.java
index a3c07721a..6629d74e2 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/CompletedDownloadsFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/CompletedDownloadsFragment.java
@@ -86,11 +86,16 @@ public class CompletedDownloadsFragment extends Fragment {
     @Override
     public void onStart() {
         super.onStart();
-        setHasOptionsMenu(true);
         loadItems();
     }
 
     @Override
+    public void onResume() {
+        super.onResume();
+        setHasOptionsMenu(true);
+    }
+
+    @Override
     public void onStop() {
         super.onStop();
         if (disposable != null) {
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/DownloadLogFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/DownloadLogFragment.java
index 0305a7d48..a2fea9f24 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/DownloadLogFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/DownloadLogFragment.java
@@ -51,6 +51,12 @@ public class DownloadLogFragment extends ListFragment {
     }
 
     @Override
+    public void onResume() {
+        super.onResume();
+        setHasOptionsMenu(true);
+    }
+
+    @Override
     public void onStop() {
         super.onStop();
         if (disposable != null) {
@@ -61,8 +67,6 @@ public class DownloadLogFragment extends ListFragment {
     @Override
     public void onViewCreated(View view, Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
-        setHasOptionsMenu(true);
-
         // add padding
         final ListView lv = getListView();
         lv.setClipToPadding(false);
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/DownloadsFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/DownloadsFragment.java
index 6f537be96..cf0c6db90 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/DownloadsFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/DownloadsFragment.java
@@ -2,19 +2,21 @@ package de.danoeh.antennapod.fragment;
 
 import android.content.Context;
 import android.content.SharedPreferences;
-import android.content.res.Resources;
 import android.os.Bundle;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.appcompat.widget.Toolbar;
-import com.google.android.material.tabs.TabLayout;
-import androidx.fragment.app.Fragment;
-import androidx.fragment.app.FragmentManager;
-import androidx.fragment.app.FragmentPagerAdapter;
-import androidx.viewpager.widget.ViewPager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+import androidx.fragment.app.Fragment;
+import androidx.viewpager2.adapter.FragmentStateAdapter;
+import androidx.viewpager2.widget.ViewPager2;
+
+import com.google.android.material.tabs.TabLayout;
+import com.google.android.material.tabs.TabLayoutMediator;
+
 import de.danoeh.antennapod.R;
 
 /**
@@ -29,10 +31,11 @@ public class DownloadsFragment extends Fragment {
     public static final int POS_RUNNING = 0;
     private static final int POS_COMPLETED = 1;
     public static final int POS_LOG = 2;
+    private static final int TOTAL_COUNT = 3;
 
     private static final String PREF_LAST_TAB_POSITION = "tab_position";
 
-    private ViewPager viewPager;
+    private ViewPager2 viewPager;
     private TabLayout tabLayout;
 
     @Override
@@ -44,12 +47,30 @@ public class DownloadsFragment extends Fragment {
         ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);
 
         viewPager = root.findViewById(R.id.viewpager);
-        DownloadsPagerAdapter pagerAdapter = new DownloadsPagerAdapter(getChildFragmentManager(), getResources());
-        viewPager.setAdapter(pagerAdapter);
+        viewPager.setAdapter(new DownloadsPagerAdapter(this));
 
         // Give the TabLayout the ViewPager
         tabLayout = root.findViewById(R.id.sliding_tabs);
-        tabLayout.setupWithViewPager(viewPager);
+        new TabLayoutMediator(tabLayout, viewPager, (tab, position) -> {
+            switch (position) {
+                case POS_RUNNING:
+                    tab.setText(R.string.downloads_running_label);
+                    break;
+                case POS_COMPLETED:
+                    tab.setText(R.string.downloads_completed_label);
+                    break;
+                case POS_LOG:
+                    tab.setText(R.string.downloads_log_label);
+                    break;
+                default:
+                    break;
+            }
+        }).attach();
+
+        // restore our last position
+        SharedPreferences prefs = getActivity().getSharedPreferences(TAG, Context.MODE_PRIVATE);
+        int lastPosition = prefs.getInt(PREF_LAST_TAB_POSITION, 0);
+        viewPager.setCurrentItem(lastPosition, false);
 
         return root;
     }
@@ -73,56 +94,29 @@ public class DownloadsFragment extends Fragment {
         editor.apply();
     }
 
-    @Override
-    public void onStart() {
-        super.onStart();
-
-        // restore our last position
-        SharedPreferences prefs = getActivity().getSharedPreferences(TAG, Context.MODE_PRIVATE);
-        int lastPosition = prefs.getInt(PREF_LAST_TAB_POSITION, 0);
-        viewPager.setCurrentItem(lastPosition);
-    }
-
-    public static class DownloadsPagerAdapter extends FragmentPagerAdapter {
-
-        final Resources resources;
+    public static class DownloadsPagerAdapter extends FragmentStateAdapter {
 
-        public DownloadsPagerAdapter(FragmentManager fm, Resources resources) {
-            super(fm);
-            this.resources = resources;
+        DownloadsPagerAdapter(@NonNull Fragment fragment) {
+            super(fragment);
         }
 
+        @NonNull
         @Override
-        public Fragment getItem(int position) {
+        public Fragment createFragment(int position) {
             switch (position) {
                 case POS_RUNNING:
                     return new RunningDownloadsFragment();
                 case POS_COMPLETED:
                     return new CompletedDownloadsFragment();
+                default:
                 case POS_LOG:
                     return new DownloadLogFragment();
-                default:
-                    return null;
             }
         }
 
         @Override
-        public int getCount() {
-            return 3;
-        }
-
-        @Override
-        public CharSequence getPageTitle(int position) {
-            switch (position) {
-                case POS_RUNNING:
-                    return resources.getString(R.string.downloads_running_label);
-                case POS_COMPLETED:
-                    return resources.getString(R.string.downloads_completed_label);
-                case POS_LOG:
-                    return resources.getString(R.string.downloads_log_label);
-                default:
-                    return super.getPageTitle(position);
-            }
+        public int getItemCount() {
+            return TOTAL_COUNT;
         }
     }
 }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesFragment.java
index 275496f24..e98890627 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesFragment.java
@@ -6,13 +6,17 @@ import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.fragment.app.Fragment;
-import androidx.fragment.app.FragmentPagerAdapter;
-import androidx.viewpager.widget.ViewPager;
+import androidx.viewpager2.adapter.FragmentStateAdapter;
+import androidx.viewpager2.widget.ViewPager2;
+
 import com.google.android.material.tabs.TabLayout;
+import com.google.android.material.tabs.TabLayoutMediator;
+
 import de.danoeh.antennapod.R;
 
 public class EpisodesFragment extends Fragment {
@@ -27,7 +31,7 @@ public class EpisodesFragment extends Fragment {
 
 
     private TabLayout tabLayout;
-    private ViewPager viewPager;
+    private ViewPager2 viewPager;
 
     //Mandatory Constructor
     public EpisodesFragment() {
@@ -46,11 +50,32 @@ public class EpisodesFragment extends Fragment {
         toolbar.setTitle(R.string.episodes_label);
         ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);
         viewPager = rootView.findViewById(R.id.viewpager);
-        viewPager.setAdapter(new EpisodesPagerAdapter());
+        viewPager.setAdapter(new EpisodesPagerAdapter(this));
 
         // Give the TabLayout the ViewPager
         tabLayout = rootView.findViewById(R.id.sliding_tabs);
-        tabLayout.setupWithViewPager(viewPager);
+
+        new TabLayoutMediator(tabLayout, viewPager, (tab, position) -> {
+            switch (position) {
+                case POS_NEW_EPISODES:
+                    tab.setText(R.string.new_episodes_label);
+                    break;
+                case POS_ALL_EPISODES:
+                    tab.setText(R.string.all_episodes_short_label);
+                    break;
+                case POS_FAV_EPISODES:
+                    tab.setText(R.string.favorite_episodes_label);
+                    break;
+                default:
+                    break;
+            }
+        }).attach();
+
+        // restore our last position
+        SharedPreferences prefs = getActivity().getSharedPreferences(TAG, Context.MODE_PRIVATE);
+        int lastPosition = prefs.getInt(PREF_LAST_TAB_POSITION, 0);
+        viewPager.setCurrentItem(lastPosition, false);
+
         return rootView;
     }
 
@@ -64,52 +89,29 @@ public class EpisodesFragment extends Fragment {
         editor.apply();
     }
 
-    @Override
-    public void onStart() {
-        super.onStart();
-
-        // restore our last position
-        SharedPreferences prefs = getActivity().getSharedPreferences(TAG, Context.MODE_PRIVATE);
-        int lastPosition = prefs.getInt(PREF_LAST_TAB_POSITION, 0);
-        viewPager.setCurrentItem(lastPosition);
-    }
-
-    public class EpisodesPagerAdapter extends FragmentPagerAdapter {
+    static class EpisodesPagerAdapter extends FragmentStateAdapter {
 
-        public EpisodesPagerAdapter() {
-            super(getChildFragmentManager());
+        EpisodesPagerAdapter(@NonNull Fragment fragment) {
+            super(fragment);
         }
 
-        @Override
         @NonNull
-        public Fragment getItem(int position) {
+        @Override
+        public Fragment createFragment(int position) {
             switch (position) {
-                case 0:
+                case POS_NEW_EPISODES:
                     return new NewEpisodesFragment();
-                case 1:
+                case POS_ALL_EPISODES:
                     return new AllEpisodesFragment();
                 default:
+                case POS_FAV_EPISODES:
                     return new FavoriteEpisodesFragment();
             }
         }
 
         @Override
-        public int getCount() {
+        public int getItemCount() {
             return TOTAL_COUNT;
         }
-
-        @Override
-        public CharSequence getPageTitle(int position) {
-            switch (position) {
-                case POS_ALL_EPISODES:
-                    return getString(R.string.all_episodes_short_label);
-                case POS_NEW_EPISODES:
-                    return getString(R.string.new_episodes_label);
-                case POS_FAV_EPISODES:
-                    return getString(R.string.favorite_episodes_label);
-                default:
-                    return super.getPageTitle(position);
-            }
-        }
     }
 }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesListFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesListFragment.java
index 189e026a1..4f283a9ab 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesListFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/EpisodesListFragment.java
@@ -83,7 +83,6 @@ public abstract class EpisodesListFragment extends Fragment {
     @Override
     public void onStart() {
         super.onStart();
-        setHasOptionsMenu(true);
         EventBus.getDefault().register(this);
         loadItems();
     }
@@ -91,6 +90,7 @@ public abstract class EpisodesListFragment extends Fragment {
     @Override
     public void onResume() {
         super.onResume();
+        setHasOptionsMenu(true);
         registerForContextMenu(recyclerView);
     }
 
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/ItemPagerFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/ItemPagerFragment.java
index aac89a65f..0c7eb23d2 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/ItemPagerFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/ItemPagerFragment.java
@@ -7,29 +7,30 @@ import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.view.ViewCompat;
 import androidx.fragment.app.Fragment;
-import androidx.fragment.app.FragmentStatePagerAdapter;
-import androidx.viewpager.widget.ViewPager;
+import androidx.viewpager2.adapter.FragmentStateAdapter;
+import androidx.viewpager2.widget.ViewPager2;
+
+import org.greenrobot.eventbus.EventBus;
+import org.greenrobot.eventbus.Subscribe;
+import org.greenrobot.eventbus.ThreadMode;
+
 import de.danoeh.antennapod.R;
-import de.danoeh.antennapod.activity.CastEnabledActivity;
 import de.danoeh.antennapod.activity.MainActivity;
 import de.danoeh.antennapod.core.event.FeedItemEvent;
 import de.danoeh.antennapod.core.feed.FeedItem;
 import de.danoeh.antennapod.core.storage.DBReader;
-import de.danoeh.antennapod.core.util.Flavors;
 import de.danoeh.antennapod.menuhandler.FeedItemMenuHandler;
 import io.reactivex.Observable;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.Disposable;
 import io.reactivex.schedulers.Schedulers;
-import org.greenrobot.eventbus.EventBus;
-import org.greenrobot.eventbus.Subscribe;
-import org.greenrobot.eventbus.ThreadMode;
 
 /**
  * Displays information about a list of FeedItems.
@@ -41,7 +42,7 @@ public class ItemPagerFragment extends Fragment {
     /**
      * Creates a new instance of an ItemPagerFragment.
      *
-     * @param feeditems The IDs of the FeedItems that belong to the same list
+     * @param feeditems   The IDs of the FeedItems that belong to the same list
      * @param feedItemPos The position of the FeedItem that is currently shown
      * @return The ItemFragment instance
      */
@@ -76,31 +77,21 @@ public class ItemPagerFragment extends Fragment {
         feedItems = getArguments().getLongArray(ARG_FEEDITEMS);
         int feedItemPos = getArguments().getInt(ARG_FEEDITEM_POS);
 
-        ViewPager pager = layout.findViewById(R.id.pager);
+        ViewPager2 pager = layout.findViewById(R.id.pager);
         // FragmentStatePagerAdapter documentation:
         // > When using FragmentStatePagerAdapter the host ViewPager must have a valid ID set.
         // When opening multiple ItemPagerFragments by clicking "item" -> "visit podcast" -> "item" -> etc,
         // the ID is no longer unique and FragmentStatePagerAdapter does not display any pages.
         int newId = ViewCompat.generateViewId();
         pager.setId(newId);
-        pager.setAdapter(new ItemPagerAdapter());
-        pager.setCurrentItem(feedItemPos);
+        pager.setAdapter(new ItemPagerAdapter(this));
+        pager.setCurrentItem(feedItemPos, false);
         loadItem(feedItems[feedItemPos]);
-        pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
-            @Override
-            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
-
-            }
-
+        pager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
             @Override
             public void onPageSelected(int position) {
                 loadItem(feedItems[position]);
             }
-
-            @Override
-            public void onPageScrollStateChanged(int state) {
-
-            }
         });
 
         EventBus.getDefault().register(this);
@@ -173,20 +164,20 @@ public class ItemPagerFragment extends Fragment {
         ((MainActivity) getActivity()).loadChildFragment(fragment);
     }
 
-    private class ItemPagerAdapter extends FragmentStatePagerAdapter {
+    private class ItemPagerAdapter extends FragmentStateAdapter {
 
-        ItemPagerAdapter() {
-            super(getFragmentManager(), BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
+        ItemPagerAdapter(@NonNull Fragment fragment) {
+            super(fragment);
         }
 
         @NonNull
         @Override
-        public Fragment getItem(int position) {
+        public Fragment createFragment(int position) {
             return ItemFragment.newInstance(feedItems[position]);
         }
 
         @Override
-        public int getCount() {
+        public int getItemCount() {
             return feedItems.length;
         }
     }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/gpodnet/GpodnetMainFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/gpodnet/GpodnetMainFragment.java
index 3ebdd80d8..4ccc53118 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/gpodnet/GpodnetMainFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/gpodnet/GpodnetMainFragment.java
@@ -4,13 +4,17 @@ import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.fragment.app.Fragment;
-import androidx.fragment.app.FragmentManager;
-import androidx.fragment.app.FragmentPagerAdapter;
-import androidx.viewpager.widget.ViewPager;
+import androidx.viewpager2.adapter.FragmentStateAdapter;
+import androidx.viewpager2.widget.ViewPager2;
+
 import com.google.android.material.tabs.TabLayout;
+import com.google.android.material.tabs.TabLayoutMediator;
+
 import de.danoeh.antennapod.R;
 
 /**
@@ -18,6 +22,11 @@ import de.danoeh.antennapod.R;
  */
 public class GpodnetMainFragment extends Fragment {
 
+    private static final int NUM_PAGES = 2;
+    private static final int POS_TOPLIST = 0;
+    private static final int POS_TAGS = 1;
+    private static final int POS_SUGGESTIONS = 2;
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         super.onCreateView(inflater, container, savedInstanceState);
@@ -26,63 +35,59 @@ public class GpodnetMainFragment extends Fragment {
         toolbar.setTitle(R.string.gpodnet_main_label);
         ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);
 
-        ViewPager viewPager = root.findViewById(R.id.viewpager);
-        GpodnetPagerAdapter pagerAdapter = new GpodnetPagerAdapter(getChildFragmentManager());
+        ViewPager2 viewPager = root.findViewById(R.id.viewpager);
+        GpodnetPagerAdapter pagerAdapter = new GpodnetPagerAdapter(this);
         viewPager.setAdapter(pagerAdapter);
 
         // Give the TabLayout the ViewPager
         TabLayout tabLayout = root.findViewById(R.id.sliding_tabs);
-        tabLayout.setupWithViewPager(viewPager);
+
+        new TabLayoutMediator(tabLayout, viewPager, (tab, position) -> {
+            switch (position) {
+                case POS_TAGS:
+                    tab.setText(R.string.gpodnet_taglist_header);
+                    break;
+                case POS_TOPLIST:
+                    tab.setText(R.string.gpodnet_toplist_header);
+                    break;
+                default:
+                case POS_SUGGESTIONS:
+                    tab.setText(R.string.gpodnet_suggestions_header);
+                    break;
+            }
+        }).attach();
 
         return root;
     }
 
-    public class GpodnetPagerAdapter extends FragmentPagerAdapter {
-        private static final int NUM_PAGES = 2;
-        private static final int POS_TOPLIST = 0;
-        private static final int POS_TAGS = 1;
-        private static final int POS_SUGGESTIONS = 2;
+    public static class GpodnetPagerAdapter extends FragmentStateAdapter {
 
-        public GpodnetPagerAdapter(FragmentManager fm) {
-            super(fm);
+        GpodnetPagerAdapter(@NonNull Fragment fragment) {
+            super(fragment);
         }
 
+        @NonNull
         @Override
-        public Fragment getItem(int i) {
+        public Fragment createFragment(int position) {
             Bundle arguments = new Bundle();
             arguments.putBoolean(PodcastListFragment.ARGUMENT_HIDE_TOOLBAR, true);
-            switch (i) {
+            switch (position) {
                 case POS_TAGS:
                     return new TagListFragment();
                 case POS_TOPLIST:
                     PodcastListFragment topListFragment = new PodcastTopListFragment();
                     topListFragment.setArguments(arguments);
                     return topListFragment;
+                default:
                 case POS_SUGGESTIONS:
                     PodcastListFragment suggestionsFragment = new SuggestionListFragment();
                     suggestionsFragment.setArguments(arguments);
                     return suggestionsFragment;
-                default:
-                    return null;
-            }
-        }
-
-        @Override
-        public CharSequence getPageTitle(int position) {
-            switch (position) {
-                case POS_TAGS:
-                    return getString(R.string.gpodnet_taglist_header);
-                case POS_TOPLIST:
-                    return getString(R.string.gpodnet_toplist_header);
-                case POS_SUGGESTIONS:
-                    return getString(R.string.gpodnet_suggestions_header);
-                default:
-                    return super.getPageTitle(position);
             }
         }
 
         @Override
-        public int getCount() {
+        public int getItemCount() {
             return NUM_PAGES;
         }
     }
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/preferences/StatisticsFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/preferences/StatisticsFragment.java
index 4b8cf1e1c..b455a10ee 100644
--- a/app/src/main/java/de/danoeh/antennapod/fragment/preferences/StatisticsFragment.java
+++ b/app/src/main/java/de/danoeh/antennapod/fragment/preferences/StatisticsFragment.java
@@ -1,17 +1,17 @@
 package de.danoeh.antennapod.fragment.preferences;
 
-import android.content.res.Resources;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
-import androidx.fragment.app.FragmentManager;
-import androidx.fragment.app.FragmentPagerAdapter;
-import androidx.viewpager.widget.ViewPager;
+import androidx.viewpager2.adapter.FragmentStateAdapter;
+import androidx.viewpager2.widget.ViewPager2;
 
 import com.google.android.material.tabs.TabLayout;
+import com.google.android.material.tabs.TabLayoutMediator;
 
 import de.danoeh.antennapod.R;
 import de.danoeh.antennapod.activity.PreferenceActivity;
@@ -29,25 +29,35 @@ public class StatisticsFragment extends Fragment {
 
 
     private TabLayout tabLayout;
-    private ViewPager viewPager;
+    private ViewPager2 viewPager;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
     }
 
-    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         super.onCreateView(inflater, container, savedInstanceState);
         setHasOptionsMenu(true);
 
         View rootView = inflater.inflate(R.layout.pager_fragment, container, false);
         viewPager = rootView.findViewById(R.id.viewpager);
-        viewPager.setAdapter(new StatisticsPagerAdapter(getChildFragmentManager(), getResources()));
-
+        viewPager.setAdapter(new StatisticsPagerAdapter(this));
         // Give the TabLayout the ViewPager
         tabLayout = rootView.findViewById(R.id.sliding_tabs);
-        tabLayout.setupWithViewPager(viewPager);
+        new TabLayoutMediator(tabLayout, viewPager, (tab, position) -> {
+            switch (position) {
+                case POS_LISTENED_HOURS:
+                    tab.setText(R.string.playback_statistics_label);
+                    break;
+                case POS_SPACE_TAKEN:
+                    tab.setText(R.string.download_statistics_label);
+                    break;
+                default:
+                    break;
+            }
+        }).attach();
 
         rootView.findViewById(R.id.toolbar).setVisibility(View.GONE);
 
@@ -60,39 +70,27 @@ public class StatisticsFragment extends Fragment {
         ((PreferenceActivity) getActivity()).getSupportActionBar().setTitle(R.string.statistics_label);
     }
 
-    public static class StatisticsPagerAdapter extends FragmentPagerAdapter {
-
-        private final Resources resources;
+    public static class StatisticsPagerAdapter extends FragmentStateAdapter {
 
-        public StatisticsPagerAdapter(FragmentManager fm, Resources resources) {
-            super(fm);
-            this.resources = resources;
+        StatisticsPagerAdapter(@NonNull Fragment fragment) {
+            super(fragment);
         }
 
+        @NonNull
         @Override
-        public Fragment getItem(int position) {
-            if (position == 0) {
-                return new PlaybackStatisticsFragment();
-            } else {
-                return new DownloadStatisticsFragment();
+        public Fragment createFragment(int position) {
+            switch (position) {
+                case POS_LISTENED_HOURS:
+                    return new PlaybackStatisticsFragment();
+                default:
+                case POS_SPACE_TAKEN:
+                    return new DownloadStatisticsFragment();
             }
         }
 
         @Override
-        public int getCount() {
+        public int getItemCount() {
             return TOTAL_COUNT;
         }
-
-        @Override
-        public CharSequence getPageTitle(int position) {
-            switch (position) {
-                case POS_LISTENED_HOURS:
-                    return resources.getString(R.string.playback_statistics_label);
-                case POS_SPACE_TAKEN:
-                    return resources.getString(R.string.download_statistics_label);
-                default:
-                    return super.getPageTitle(position);
-            }
-        }
     }
 }
diff --git a/app/src/main/java/de/danoeh/antennapod/view/NestedScrollableHost.java b/app/src/main/java/de/danoeh/antennapod/view/NestedScrollableHost.java
new file mode 100644
index 000000000..a4daa9109
--- /dev/null
+++ b/app/src/main/java/de/danoeh/antennapod/view/NestedScrollableHost.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Source: https://github.com/android/views-widgets-samples/blob/87e58d1/ViewPager2/app/src/main/java/androidx/viewpager2/integration/testapp/NestedScrollableHost.kt
+ * And modified for our need
+ */
+
+package de.danoeh.antennapod.view;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewConfiguration;
+import android.view.ViewParent;
+import android.widget.FrameLayout;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.viewpager2.widget.ViewPager2;
+
+import static androidx.viewpager2.widget.ViewPager2.ORIENTATION_HORIZONTAL;
+import static androidx.viewpager2.widget.ViewPager2.ORIENTATION_VERTICAL;
+
+/**
+ * Layout to wrap a scrollable component inside a ViewPager2. Provided as a solution to the problem
+ * where pages of ViewPager2 have nested scrollable elements that scroll in the same direction as
+ * ViewPager2. The scrollable element needs to be the immediate and only child of this host layout.
+ *
+ * <p>This solution has limitations when using multiple levels of nested scrollable elements
+ * (e.g. a horizontal RecyclerView in a vertical RecyclerView in a horizontal ViewPager2).
+ */
+class NestedScrollableHost extends FrameLayout {
+
+    public NestedScrollableHost(@NonNull Context context) {
+        super(context);
+        touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
+    }
+
+    public NestedScrollableHost(@NonNull Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+        touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
+    }
+
+    private int touchSlop = 0;
+    private float initialX = 0f;
+    private float initialY = 0f;
+
+    private ViewPager2 getParentViewPager() {
+        View v = (View) getParent();
+        while (v != null && !(v instanceof ViewPager2)) {
+            v = (View) v.getParent();
+        }
+        return v == null ? null : (ViewPager2) v;
+    }
+
+    public boolean onInterceptTouchEvent(MotionEvent e) {
+        ViewPager2 parentViewPager = getParentViewPager();
+        if (parentViewPager == null) {
+            return super.onInterceptTouchEvent(e);
+        }
+
+        ViewParent parent = getParent();
+        int orientation = parentViewPager.getOrientation();
+
+        if (e.getAction() == MotionEvent.ACTION_DOWN) {
+            initialX = e.getX();
+            initialY = e.getY();
+            parent.requestDisallowInterceptTouchEvent(true);
+        } else if (e.getAction() == MotionEvent.ACTION_MOVE) {
+            int dx = (int) (e.getX() - initialX);
+            int dy = (int) (e.getY() - initialY);
+            boolean isVpHorizontal = orientation == ORIENTATION_HORIZONTAL;
+
+            // assuming ViewPager2 touch-slop is 2x touch-slop of child
+            float scaledDx = Math.abs(dx) * (isVpHorizontal ? .5f : 1f);
+            float scaledDy = Math.abs(dy) * (isVpHorizontal ? 1f : .5f);
+            if (scaledDx > touchSlop || scaledDy > touchSlop) {
+                int value = isVpHorizontal ? dy : dx;
+                if (isVpHorizontal == (scaledDy > scaledDx)) {
+                    // Gesture is perpendicular
+                    orientation = orientation == ORIENTATION_VERTICAL
+                            ? ORIENTATION_HORIZONTAL : ORIENTATION_VERTICAL;
+                    value = isVpHorizontal ? dy : dx;
+                }
+
+                int direction = (int) -Math.copySign(1, value);
+                View child = getChildAt(0);
+                if (orientation == ORIENTATION_HORIZONTAL) {
+                    parent.requestDisallowInterceptTouchEvent(child.canScrollHorizontally(direction));
+                } else {
+                    parent.requestDisallowInterceptTouchEvent(child.canScrollVertically(direction));
+                }
+            }
+        }
+
+        return super.onInterceptTouchEvent(e);
+    }
+}
diff --git a/app/src/main/java/de/danoeh/antennapod/view/PagerIndicatorView.java b/app/src/main/java/de/danoeh/antennapod/view/PagerIndicatorView.java
index 53a95eede..240a565c8 100644
--- a/app/src/main/java/de/danoeh/antennapod/view/PagerIndicatorView.java
+++ b/app/src/main/java/de/danoeh/antennapod/view/PagerIndicatorView.java
@@ -1,15 +1,20 @@
 package de.danoeh.antennapod.view;
 
+import android.animation.ArgbEvaluator;
 import android.content.Context;
 import android.content.res.TypedArray;
-import android.database.DataSetObserver;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.util.AttributeSet;
 import android.view.View;
+
 import androidx.annotation.Nullable;
-import androidx.vectordrawable.graphics.drawable.ArgbEvaluator;
-import androidx.viewpager.widget.ViewPager;
+import androidx.core.text.TextUtilsCompat;
+import androidx.core.view.ViewCompat;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.viewpager2.widget.ViewPager2;
+
+import java.util.Locale;
 
 public class PagerIndicatorView extends View {
     private final Paint paint = new Paint();
@@ -38,26 +43,31 @@ public class PagerIndicatorView extends View {
         paint.setAntiAlias(true);
         paint.setStyle(Paint.Style.FILL);
 
-        int[] colorAttrs = new int[] { android.R.attr.textColorSecondary };
+        int[] colorAttrs = new int[]{android.R.attr.textColorSecondary};
         TypedArray a = getContext().obtainStyledAttributes(colorAttrs);
         circleColorHighlight = a.getColor(0, 0xffffffff);
         circleColor = (Integer) new ArgbEvaluator().evaluate(0.8f, 0x00ffffff, circleColorHighlight);
         a.recycle();
     }
 
-    public void setViewPager(ViewPager pager) {
-        numPages = pager.getAdapter().getCount();
-        pager.getAdapter().registerDataSetObserver(new DataSetObserver() {
+    public void setViewPager(ViewPager2 pager) {
+        numPages = pager.getAdapter().getItemCount();
+        pager.getAdapter().registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
             @Override
             public void onChanged() {
-                numPages = pager.getAdapter().getCount();
+                numPages = pager.getAdapter().getItemCount();
                 invalidate();
             }
         });
-        pager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
+        boolean isLocaleRtl = TextUtilsCompat.getLayoutDirectionFromLocale(Locale.getDefault())
+                == ViewCompat.LAYOUT_DIRECTION_RTL;
+        pager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
             @Override
             public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                 PagerIndicatorView.this.position = position + positionOffset;
+                if (isLocaleRtl) {
+                    PagerIndicatorView.this.position = numPages - 1 - PagerIndicatorView.this.position;
+                }
                 invalidate();
             }
         });
diff --git a/app/src/main/res/layout/audioplayer_fragment.xml b/app/src/main/res/layout/audioplayer_fragment.xml
index d01228d27..a9e9137f2 100644
--- a/app/src/main/res/layout/audioplayer_fragment.xml
+++ b/app/src/main/res/layout/audioplayer_fragment.xml
@@ -34,7 +34,7 @@
             tools:background="@android:color/holo_green_light"
             android:elevation="8dp"/>
 
-    <androidx.viewpager.widget.ViewPager
+    <androidx.viewpager2.widget.ViewPager2
             android:id="@+id/pager"
             android:layout_width="match_parent"
             android:layout_height="0dp"
diff --git a/app/src/main/res/layout/feeditem_fragment.xml b/app/src/main/res/layout/feeditem_fragment.xml
index fe1063d85..8dfbbe562 100644
--- a/app/src/main/res/layout/feeditem_fragment.xml
+++ b/app/src/main/res/layout/feeditem_fragment.xml
@@ -171,12 +171,18 @@
 
     </LinearLayout>
 
-    <de.danoeh.antennapod.view.ShownotesWebView
-        android:id="@+id/webvDescription"
-        android:layout_width="match_parent"
+    <de.danoeh.antennapod.view.NestedScrollableHost
         android:layout_below="@id/header"
-        android:layout_height="match_parent"
-        android:foreground="?android:windowContentOverlay" />
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <de.danoeh.antennapod.view.ShownotesWebView
+            android:id="@+id/webvDescription"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:foreground="?android:windowContentOverlay" />
+
+    </de.danoeh.antennapod.view.NestedScrollableHost>
 
     <FrameLayout
         android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/feeditem_pager_fragment.xml b/app/src/main/res/layout/feeditem_pager_fragment.xml
index 50c490611..ac7316dd8 100644
--- a/app/src/main/res/layout/feeditem_pager_fragment.xml
+++ b/app/src/main/res/layout/feeditem_pager_fragment.xml
@@ -14,7 +14,7 @@
             app:navigationIcon="?homeAsUpIndicator"
             android:id="@+id/toolbar"/>
 
-    <androidx.viewpager.widget.ViewPager
+    <androidx.viewpager2.widget.ViewPager2
             android:id="@+id/pager"
             android:layout_width="match_parent"
             android:layout_height="match_parent"/>
diff --git a/app/src/main/res/layout/item_description_fragment.xml b/app/src/main/res/layout/item_description_fragment.xml
index 96382eae3..3766cf805 100644
--- a/app/src/main/res/layout/item_description_fragment.xml
+++ b/app/src/main/res/layout/item_description_fragment.xml
@@ -1,11 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.core.widget.NestedScrollView
-xmlns:android="http://schemas.android.com/apk/res/android"
-android:layout_width="match_parent"
-android:layout_height="match_parent"
-android:fillViewport="false">
-    <de.danoeh.antennapod.view.ShownotesWebView
+<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fillViewport="false">
+
+    <de.danoeh.antennapod.view.NestedScrollableHost
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <de.danoeh.antennapod.view.ShownotesWebView
             android:id="@+id/webview"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"/>
+            android:layout_height="wrap_content" />
+
+    </de.danoeh.antennapod.view.NestedScrollableHost>
+
 </androidx.core.widget.NestedScrollView>
\ No newline at end of file
diff --git a/app/src/main/res/layout/pager_fragment.xml b/app/src/main/res/layout/pager_fragment.xml
index 6a642caae..f7bf058c4 100644
--- a/app/src/main/res/layout/pager_fragment.xml
+++ b/app/src/main/res/layout/pager_fragment.xml
@@ -21,9 +21,9 @@
             app:tabMode="fixed"
             app:tabGravity="fill"/>
 
-    <androidx.viewpager.widget.ViewPager
+    <androidx.viewpager2.widget.ViewPager2
             android:id="@+id/viewpager"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"/>
+            android:layout_height="match_parent"/>
 
 </LinearLayout>
diff --git a/app/src/main/res/layout/statistics_fragment.xml b/app/src/main/res/layout/statistics_fragment.xml
index e69bc1a70..7b2550e93 100644
--- a/app/src/main/res/layout/statistics_fragment.xml
+++ b/app/src/main/res/layout/statistics_fragment.xml
@@ -14,7 +14,7 @@
         app:tabGravity="fill"
         app:tabMode="fixed" />
 
-    <androidx.viewpager.widget.ViewPager
+    <androidx.viewpager2.widget.ViewPager2
         android:id="@+id/viewpager"
         android:layout_width="match_parent"
         android:layout_height="0px"