Adopt StatisticsFragment with ViewPager2

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 +29,34 @@ 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(getString(R.string.playback_statistics_label));
+                    break;
+                default:
+                case POS_SPACE_TAKEN:
+                    tab.setText(getString(R.string.download_statistics_label));
+                    break;
+            }
+        }).attach();
 
         rootView.findViewById(R.id.toolbar).setVisibility(View.GONE);
 
@@ -60,39 +69,27 @@ public class StatisticsFragment extends Fragment {
         ((PreferenceActivity) getActivity()).getSupportActionBar().setTitle(R.string.statistics_label);
     }
 
-    public static class StatisticsPagerAdapter extends FragmentPagerAdapter {
+    public static class StatisticsPagerAdapter extends FragmentStateAdapter {
 
-        private final Resources resources;
-
-        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();
-            }
-        }
-
-        @Override
-        public int getCount() {
-            return TOTAL_COUNT;
-        }
-
-        @Override
-        public CharSequence getPageTitle(int position) {
+        public Fragment createFragment(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);
+                case 0:
+                    return new PlaybackStatisticsFragment();
                 default:
-                    return super.getPageTitle(position);
+                case 1:
+                    return new DownloadStatisticsFragment();
             }
         }
+
+        @Override
+        public int getItemCount() {
+            return TOTAL_COUNT;
+        }
     }
 }

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

@@ -14,7 +14,7 @@
         app:tabGravity="fill"
         app:tabMode="fixed" />
 
-    <androidx.viewpager.widget.ViewPager
+    <androidx.viewpager.widget.ViewPager2
         android:id="@+id/viewpager"
         android:layout_width="match_parent"
         android:layout_height="0px"