Change DownloadsFragment to extend AbsLibraryPagerRecyclerViewCustomGridSizeFragment and add DownloadsAdapter.

app/src/main/java/org/adrianvictor/geleia/adapter/DownloadsAdapter.java

@@ -0,0 +1,69 @@
+package org.adrianvictor.geleia.adapter;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import org.adrianvictor.geleia.R;
+import org.adrianvictor.geleia.model.Song;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DownloadsAdapter extends RecyclerView.Adapter<DownloadsAdapter.ViewHolder> {
+    private final List<Song> mSongs;
+    private final int mLayoutId;
+
+    public DownloadsAdapter(int layoutId) {
+        mLayoutId = layoutId;
+        this.mSongs = new ArrayList<>();
+    }
+
+    public void swapDataSet(List<Song> newSongs) {
+        mSongs.clear();
+        if (newSongs != null) {
+            mSongs.addAll(newSongs);
+        }
+        notifyDataSetChanged();
+    }
+
+    @NonNull
+    @Override
+    public DownloadsAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(parent.getContext()).inflate(mLayoutId, parent, false);
+        return new ViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull DownloadsAdapter.ViewHolder holder, int position) {
+        final Song song = mSongs.get(position);
+
+        holder.title.setText(song.title);
+        holder.artist.setText(song.artistName);
+
+        // TODO: Load album cover into holder.cover using a library like Glide or Picasso
+    }
+
+    @Override
+    public int getItemCount() {
+        return mSongs.size();
+    }
+
+    public static class ViewHolder extends RecyclerView.ViewHolder {
+        public final TextView title;
+        public final TextView artist;
+        public final ImageView cover;
+
+        public ViewHolder(View itemView) {
+            super(itemView);
+            title = itemView.findViewById(R.id.title);
+            artist = itemView.findViewById(R.id.text);
+            cover = itemView.findViewById(R.id.image);
+        }
+    }
+}

app/src/main/java/org/adrianvictor/geleia/fragments/library/DownloadsFragment.java

@@ -1,25 +1,124 @@
 package org.adrianvictor.geleia.fragments.library;
 
-import android.os.Bundle;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.GridLayoutManager;
 
-import org.adrianvictor.geleia.R;
 
-public class DownloadsFragment extends Fragment {
-    public static DownloadsFragment newInstance() {
-        return new DownloadsFragment();
-    }
+import org.adrianvictor.geleia.adapter.DownloadsAdapter;
 
-    @Nullable
+import org.adrianvictor.geleia.model.Song;
+import org.adrianvictor.geleia.model.SortMethod;
+import org.adrianvictor.geleia.model.SortOrder;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DownloadsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFragment<DownloadsAdapter, GridLayoutManager, Void> {
+    @NonNull
     @Override
-    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
-        return inflater.inflate(R.layout.downloads_fragment, container, false);
+    protected DownloadsAdapter createAdapter() {
+        return new DownloadsAdapter(getItemLayoutRes());
     }
 
+    @NonNull
+    @Override
+    protected GridLayoutManager createLayoutManager() {
+        return new GridLayoutManager(getActivity(), getGridSize());
+    }
+
+    @NonNull
+    @Override
+    protected Void createQuery() {
+        return null;
+    }
+
+    @Override
+    protected void loadItems(int index) {
+        List<Song> dummySongs = new ArrayList<>();
+
+        Song song1 = new Song();
+        song1.title = "Dummy Song Title";
+        song1.artistName = "A. Dummy Artist";
+
+        dummySongs.add(song1);
+
+        Song song2 = new Song();
+        song2.title = "Another Test Song";
+        song2.artistName = "The Testers";
+        dummySongs.add(song2);
+
+        getActivity().runOnUiThread(() -> {
+            getAdapter().swapDataSet(dummySongs);
+        });
+    }
+
+    @Override
+    protected int loadGridSize() {
+        return 1;
+    }
+
+    @Override
+    protected void saveGridSize(int gridColumns) {
+
+    }
+
+    @Override
+    protected int loadGridSizeLand() {
+        return 1;
+    }
+
+    @Override
+    protected void saveGridSizeLand(int gridColumns) {
+
+    }
+
+    @Override
+    protected void saveUsePalette(boolean usePalette) {
+
+    }
+
+    @Override
+    protected boolean loadUsePalette() {
+        return false;
+    }
+
+    @Override
+    protected void setUsePalette(boolean usePalette) {
+
+    }
+
+    @Override
+    protected void setGridSize(int gridSize) {
+
+    }
+
+    @Override
+    protected SortMethod loadSortMethod() {
+        return SortMethod.ADDED;
+    }
+
+    @Override
+    protected void saveSortMethod(SortMethod sortMethod) {
+
+    }
+
+    @Override
+    protected void setSortMethod(SortMethod sortMethod) {
+
+    }
+
+    @Override
+    protected SortOrder loadSortOrder() {
+        return SortOrder.ASCENDING;
+    }
+
+    @Override
+    protected void saveSortOrder(SortOrder sortOrder) {
+
+    }
+
+    @Override
+    protected void setSortOrder(SortOrder sortOrder) {
+
+    }
 }

app/src/main/java/org/adrianvictor/geleia/util/PreferenceUtil.java

@@ -110,20 +110,9 @@ public final class PreferenceUtil {
         }
     };
 
-    private static final PreferenceMigration Migration3 = new PreferenceMigration(2, 3) {
-        @Override
-        public void migrate(SharedPreferences preferences) {
-            String currentCategories = preferences.getString(CATEGORIES, "");
-            if (!currentCategories.toUpperCase().contains(Category.DOWNLOADS.toString())) {
-                preferences.edit().putString(CATEGORIES, currentCategories + "." + Category.DOWNLOADS.toString()).commit();
-            }
-        }
-    };
-
     private static final List<PreferenceMigration> migrations = Arrays.asList(
         Migration1,
-        Migration2,
-        Migration3
+        Migration2
     );
 
     private static PreferenceUtil instance;

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

@@ -1,6 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    tools:context="org.adrianvictor.geleia.fragments.library.DownloadsFragment">
 
+    <androidx.recyclerview.widget.RecyclerView
+        android:layout_width="409dp"
+        android:layout_height="729dp"
+        tools:layout_editor_absoluteX="1dp"
+        tools:layout_editor_absoluteY="1dp" />
 </androidx.constraintlayout.widget.ConstraintLayout>