Add new tab in MainActivity and migration for listing downloads.

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

@@ -10,6 +10,9 @@ import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentPagerAdapter;
 
+import org.adrianvictor.geleia.activities.UnreachableActivity;
+import org.adrianvictor.geleia.fragments.OfflineFragment;
+import org.adrianvictor.geleia.fragments.library.DownloadsFragment;
 import org.adrianvictor.geleia.fragments.library.FavoritesFragment;
 import org.adrianvictor.geleia.model.Category;
 import org.adrianvictor.geleia.fragments.library.AlbumsFragment;
@@ -157,7 +160,8 @@ public class MusicLibraryPagerAdapter extends FragmentPagerAdapter {
         ARTISTS(ArtistsFragment.class),
         GENRES(GenresFragment.class),
         PLAYLISTS(PlaylistsFragment.class),
-        FAVORITES(FavoritesFragment.class);
+        FAVORITES(FavoritesFragment.class),
+        DOWNLOADS(DownloadsFragment.class);
 
         private final Class<? extends Fragment> mFragmentClass;
 

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

@@ -0,0 +1,25 @@
+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 org.adrianvictor.geleia.R;
+
+public class DownloadsFragment extends Fragment {
+    public static DownloadsFragment newInstance() {
+        return new DownloadsFragment();
+    }
+
+    @Nullable
+    @Override
+    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.downloads_fragment, container, false);
+    }
+
+}

app/src/main/java/org/adrianvictor/geleia/model/Category.java

@@ -10,7 +10,8 @@ public enum Category {
     ARTISTS(R.string.artists),
     GENRES(R.string.genres),
     PLAYLISTS(R.string.playlists),
-    FAVORITES(R.string.favorites);
+    FAVORITES(R.string.favorites),
+    DOWNLOADS(R.string.downloads);
 
     @StringRes
     public final int title;

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

@@ -110,9 +110,20 @@ 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
+        Migration2,
+        Migration3
     );
 
     private static PreferenceUtil instance;

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

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -247,6 +247,7 @@
 
     <string name="download_channel_name">Downloads</string>
     <string name="downloading_songs">Downloading songs</string>
+    <string name="downloads">Downloads</string>
     <plurals name="downloading_s_songs">
         <item quantity="one">Downloading %d song</item>
         <item quantity="other">Downloading %d songs</item>