From 4e6df0faf8bb7c44f6807b830d4fa891a7406ff3 Mon Sep 17 00:00:00 2001
From: Karim Abou Zeid <karim23697@gmail.com>
Date: Sun, 20 Mar 2016 21:11:21 +0100
Subject: [PATCH] The LibraryFragments are now loading their content async.

---
 .../gramophone/adapter/PlaylistAdapter.java   |  7 +-
 .../adapter/album/AlbumAdapter.java           |  8 +-
 .../adapter/artist/ArtistAdapter.java         |  4 +
 .../gramophone/loader/PlaylistLoader.java     |  7 +-
 .../misc/WrappedAsyncTaskLoader.java          | 76 +++++++++++++++++++
 .../gramophone/service/MultiPlayer.java       |  3 +-
 .../AbsLibraryPagerFragment.java              |  7 ++
 ...gerRecyclerViewCustomGridSizeFragment.java | 26 ++++++-
 .../AbsLibraryPagerRecyclerViewFragment.java  | 36 ++++++---
 .../libraryfragments/AlbumsFragment.java      | 58 +++++++++++++-
 .../libraryfragments/ArtistsFragment.java     | 58 +++++++++++++-
 .../libraryfragments/PlaylistsFragment.java   | 67 +++++++++++++---
 .../libraryfragments/SongsFragment.java       | 58 ++++++++++++--
 .../kabouzeid/gramophone/util/MusicUtil.java  |  4 +
 .../res/layout/sliding_music_panel_layout.xml |  2 +-
 15 files changed, 367 insertions(+), 54 deletions(-)
 create mode 100644 app/src/main/java/com/kabouzeid/gramophone/misc/WrappedAsyncTaskLoader.java

diff --git a/app/src/main/java/com/kabouzeid/gramophone/adapter/PlaylistAdapter.java b/app/src/main/java/com/kabouzeid/gramophone/adapter/PlaylistAdapter.java
index 1041b245..32b0b6ed 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/adapter/PlaylistAdapter.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/adapter/PlaylistAdapter.java
@@ -45,16 +45,12 @@ public class PlaylistAdapter extends AbsMultiSelectAdapter<PlaylistAdapter.ViewH
     protected final AppCompatActivity activity;
     protected ArrayList<Playlist> dataSet;
     protected int itemLayoutRes;
-    protected int favoritePlaylistId;
 
     public PlaylistAdapter(AppCompatActivity activity, ArrayList<Playlist> dataSet, @LayoutRes int itemLayoutRes, @Nullable CabHolder cabHolder) {
         super(activity, cabHolder, R.menu.menu_playlists_selection);
         this.activity = activity;
         this.dataSet = dataSet;
         this.itemLayoutRes = itemLayoutRes;
-
-        favoritePlaylistId = MusicUtil.getFavoritesPlaylist(activity).id;
-
         setHasStableIds(true);
     }
 
@@ -64,7 +60,6 @@ public class PlaylistAdapter extends AbsMultiSelectAdapter<PlaylistAdapter.ViewH
 
     public void swapDataSet(ArrayList<Playlist> dataSet) {
         this.dataSet = dataSet;
-        favoritePlaylistId = MusicUtil.getFavoritesPlaylist(activity).id;
         notifyDataSetChanged();
     }
 
@@ -113,7 +108,7 @@ public class PlaylistAdapter extends AbsMultiSelectAdapter<PlaylistAdapter.ViewH
         if (playlist instanceof AbsSmartPlaylist) {
             return ((AbsSmartPlaylist) playlist).iconRes;
         }
-        return playlist.id == favoritePlaylistId ? R.drawable.ic_favorite_white_24dp : R.drawable.ic_queue_music_white_24dp;
+        return MusicUtil.isFavoritePlaylist(activity, playlist) ? R.drawable.ic_favorite_white_24dp : R.drawable.ic_queue_music_white_24dp;
     }
 
     @Override
diff --git a/app/src/main/java/com/kabouzeid/gramophone/adapter/album/AlbumAdapter.java b/app/src/main/java/com/kabouzeid/gramophone/adapter/album/AlbumAdapter.java
index 00dcd89e..cf6f893a 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/adapter/album/AlbumAdapter.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/adapter/album/AlbumAdapter.java
@@ -40,7 +40,7 @@ public class AlbumAdapter extends AbsMultiSelectAdapter<AlbumAdapter.ViewHolder,
     public static final String TAG = AlbumAdapter.class.getSimpleName();
 
     protected final AppCompatActivity activity;
-    protected List<Album> dataSet;
+    protected ArrayList<Album> dataSet;
 
     protected int itemLayoutRes;
 
@@ -61,11 +61,15 @@ public class AlbumAdapter extends AbsMultiSelectAdapter<AlbumAdapter.ViewHolder,
         notifyDataSetChanged();
     }
 
-    public void swapDataSet(List<Album> dataSet) {
+    public void swapDataSet(ArrayList<Album> dataSet) {
         this.dataSet = dataSet;
         notifyDataSetChanged();
     }
 
+    public ArrayList<Album> getDataSet() {
+        return dataSet;
+    }
+
     @NonNull
     @Override
     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
diff --git a/app/src/main/java/com/kabouzeid/gramophone/adapter/artist/ArtistAdapter.java b/app/src/main/java/com/kabouzeid/gramophone/adapter/artist/ArtistAdapter.java
index f91641e7..71610822 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/adapter/artist/ArtistAdapter.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/adapter/artist/ArtistAdapter.java
@@ -65,6 +65,10 @@ public class ArtistAdapter extends AbsMultiSelectAdapter<ArtistAdapter.ViewHolde
         notifyDataSetChanged();
     }
 
+    public ArrayList<Artist> getDataSet() {
+        return dataSet;
+    }
+
     public void usePalette(boolean usePalette) {
         this.usePalette = usePalette;
         notifyDataSetChanged();
diff --git a/app/src/main/java/com/kabouzeid/gramophone/loader/PlaylistLoader.java b/app/src/main/java/com/kabouzeid/gramophone/loader/PlaylistLoader.java
index 8bc95b16..60ad9f1b 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/loader/PlaylistLoader.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/loader/PlaylistLoader.java
@@ -11,12 +11,11 @@ import android.support.annotation.Nullable;
 import com.kabouzeid.gramophone.model.Playlist;
 
 import java.util.ArrayList;
-import java.util.List;
 
 public class PlaylistLoader {
 
     @NonNull
-    public static List<Playlist> getAllPlaylists(@NonNull final Context context) {
+    public static ArrayList<Playlist> getAllPlaylists(@NonNull final Context context) {
         return getAllPlaylists(makePlaylistCursor(context, null, null));
     }
 
@@ -55,8 +54,8 @@ public class PlaylistLoader {
     }
 
     @NonNull
-    public static List<Playlist> getAllPlaylists(@Nullable final Cursor cursor) {
-        List<Playlist> playlists = new ArrayList<>();
+    public static ArrayList<Playlist> getAllPlaylists(@Nullable final Cursor cursor) {
+        ArrayList<Playlist> playlists = new ArrayList<>();
 
         if (cursor != null && cursor.moveToFirst()) {
             do {
diff --git a/app/src/main/java/com/kabouzeid/gramophone/misc/WrappedAsyncTaskLoader.java b/app/src/main/java/com/kabouzeid/gramophone/misc/WrappedAsyncTaskLoader.java
new file mode 100644
index 00000000..a8fbe651
--- /dev/null
+++ b/app/src/main/java/com/kabouzeid/gramophone/misc/WrappedAsyncTaskLoader.java
@@ -0,0 +1,76 @@
+
+package com.kabouzeid.gramophone.misc;
+
+import android.content.Context;
+import android.support.v4.content.AsyncTaskLoader;
+
+import hugo.weaving.DebugLog;
+
+/**
+ * <a href="http://code.google.com/p/android/issues/detail?id=14944">Issue
+ * 14944</a>
+ *
+ * @author Alexander Blom
+ */
+public abstract class WrappedAsyncTaskLoader<D> extends AsyncTaskLoader<D> {
+
+    private D mData;
+
+    /**
+     * Constructor of <code>WrappedAsyncTaskLoader</code>
+     *
+     * @param context The {@link Context} to use.
+     */
+    public WrappedAsyncTaskLoader(Context context) {
+        super(context);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @DebugLog
+    @Override
+    public void deliverResult(D data) {
+        if (!isReset()) {
+            this.mData = data;
+            super.deliverResult(data);
+        } else {
+            // An asynchronous query came in while the loader is stopped
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @DebugLog
+    @Override
+    protected void onStartLoading() {
+        if (this.mData != null) {
+            deliverResult(this.mData);
+        } else if (takeContentChanged() || this.mData == null) {
+            forceLoad();
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @DebugLog
+    @Override
+    protected void onStopLoading() {
+        // Attempt to cancel the current load task if possible
+        cancelLoad();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @DebugLog
+    @Override
+    protected void onReset() {
+        super.onReset();
+        // Ensure the loader is stopped
+        onStopLoading();
+        this.mData = null;
+    }
+}
diff --git a/app/src/main/java/com/kabouzeid/gramophone/service/MultiPlayer.java b/app/src/main/java/com/kabouzeid/gramophone/service/MultiPlayer.java
index 9db5a4ff..8e4b1ba4 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/service/MultiPlayer.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/service/MultiPlayer.java
@@ -355,7 +355,8 @@ public class MultiPlayer implements Playback, MediaPlayer.OnErrorListener, Media
                 // SystemClock.sleep(25);
                 mNextPlayer.start();
             }
-            mCompletion.onCompletion(this);
+            if (mCompletion != null)
+                mCompletion.onCompletion(this);
         }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerFragment.java b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerFragment.java
index 565d4c76..cd227a6f 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerFragment.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerFragment.java
@@ -2,6 +2,7 @@ package com.kabouzeid.gramophone.ui.fragments.libraryfragments;
 
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
+import android.support.v4.app.LoaderManager;
 
 import com.kabouzeid.gramophone.ui.fragments.LibraryFragment;
 
@@ -10,6 +11,12 @@ import com.kabouzeid.gramophone.ui.fragments.LibraryFragment;
  */
 public class AbsLibraryPagerFragment extends Fragment {
 
+    /* http://stackoverflow.com/a/2888433 */
+    @Override
+    public LoaderManager getLoaderManager() {
+        return getParentFragment().getLoaderManager();
+    }
+
     public LibraryFragment getLibraryFragment() {
         return (LibraryFragment) getParentFragment();
     }
diff --git a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerRecyclerViewCustomGridSizeFragment.java b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerRecyclerViewCustomGridSizeFragment.java
index dd23ae03..b42ef451 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerRecyclerViewCustomGridSizeFragment.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerRecyclerViewCustomGridSizeFragment.java
@@ -1,7 +1,10 @@
 package com.kabouzeid.gramophone.ui.fragments.libraryfragments;
 
+import android.os.Bundle;
 import android.support.annotation.LayoutRes;
+import android.support.annotation.NonNull;
 import android.support.v7.widget.RecyclerView;
+import android.view.View;
 
 import com.kabouzeid.gramophone.R;
 import com.kabouzeid.gramophone.util.Util;
@@ -14,6 +17,7 @@ public abstract class AbsLibraryPagerRecyclerViewCustomGridSizeFragment<A extend
 
     private boolean usePaletteInitialized;
     private boolean usePalette;
+    private int currentLayoutRes;
 
     public final int getGridSize() {
         if (gridSize == 0) {
@@ -53,7 +57,7 @@ public abstract class AbsLibraryPagerRecyclerViewCustomGridSizeFragment<A extend
         } else {
             saveGridSize(gridSize);
         }
-        // only recreate the adapter and layout manager if the layout res has changed
+        // only recreate the adapter and layout manager if the layout currentLayoutRes has changed
         if (oldLayoutRes != getItemLayoutRes()) {
             invalidateLayoutManager();
             invalidateAdapter();
@@ -76,7 +80,7 @@ public abstract class AbsLibraryPagerRecyclerViewCustomGridSizeFragment<A extend
     }
 
     /**
-     * Override to customize which item layout res should be used. You might also want to override {@link #canUsePalette()} then.
+     * Override to customize which item layout currentLayoutRes should be used. You might also want to override {@link #canUsePalette()} then.
      *
      * @see #getGridSize()
      */
@@ -88,14 +92,28 @@ public abstract class AbsLibraryPagerRecyclerViewCustomGridSizeFragment<A extend
         return R.layout.item_list;
     }
 
-    protected void applyRecyclerViewPaddingForLayoutRes(@LayoutRes int res) {
+    protected final void notifyLayoutResChanged(@LayoutRes int res) {
+        this.currentLayoutRes = res;
+        RecyclerView recyclerView = getRecyclerView();
+        if (recyclerView != null) {
+            applyRecyclerViewPaddingForLayoutRes(recyclerView, currentLayoutRes);
+        }
+    }
+
+    @Override
+    public void onViewCreated(View view, Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+        applyRecyclerViewPaddingForLayoutRes(getRecyclerView(), currentLayoutRes);
+    }
+
+    protected void applyRecyclerViewPaddingForLayoutRes(@NonNull RecyclerView recyclerView, @LayoutRes int res) {
         int padding;
         if (res == R.layout.item_grid) {
             padding = (int) (getResources().getDisplayMetrics().density * 2);
         } else {
             padding = 0;
         }
-        getRecyclerView().setPadding(padding, padding, padding, padding);
+        recyclerView.setPadding(padding, padding, padding, padding);
     }
 
     protected abstract int loadGridSize();
diff --git a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerRecyclerViewFragment.java b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerRecyclerViewFragment.java
index 3f68718f..1c1623d0 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerRecyclerViewFragment.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AbsLibraryPagerRecyclerViewFragment.java
@@ -40,6 +40,13 @@ public abstract class AbsLibraryPagerRecyclerViewFragment<A extends RecyclerView
     private A adapter;
     private LM layoutManager;
 
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        initLayoutManager();
+        initAdapter(); // makes sure the adapter is not null when the loader finishes loading
+    }
+
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View view = inflater.inflate(getLayoutRes(), container, false);
@@ -55,19 +62,27 @@ public abstract class AbsLibraryPagerRecyclerViewFragment<A extends RecyclerView
         getLibraryFragment().getMainActivity().addMusicServiceEventListener(this);
 
         setUpRecyclerView();
-
-        checkIsEmpty();
     }
 
     private void setUpRecyclerView() {
         if (recyclerView instanceof FastScrollRecyclerView) {
             ViewUtil.setUpFastScrollRecyclerViewColor(getActivity(), ((FastScrollRecyclerView) recyclerView), ThemeStore.accentColor(getActivity()));
         }
-        invalidateLayoutManager();
-        invalidateAdapter();
+        recyclerView.setLayoutManager(layoutManager);
+        recyclerView.setAdapter(adapter);
+    }
+
+    protected void invalidateLayoutManager() {
+        initLayoutManager();
+        recyclerView.setLayoutManager(layoutManager);
     }
 
     protected void invalidateAdapter() {
+        initAdapter();
+        recyclerView.setAdapter(adapter);
+    }
+
+    private void initAdapter() {
         adapter = createAdapter();
         adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
             @Override
@@ -76,12 +91,11 @@ public abstract class AbsLibraryPagerRecyclerViewFragment<A extends RecyclerView
                 checkIsEmpty();
             }
         });
-        recyclerView.setAdapter(adapter);
+        checkIsEmpty();
     }
 
-    protected void invalidateLayoutManager() {
+    private void initLayoutManager() {
         layoutManager = createLayoutManager();
-        recyclerView.setLayoutManager(layoutManager);
     }
 
     protected A getAdapter() {
@@ -128,11 +142,8 @@ public abstract class AbsLibraryPagerRecyclerViewFragment<A extends RecyclerView
 
     private void checkIsEmpty() {
         if (empty != null) {
-            RecyclerView.Adapter adapter = getAdapter();
-            if (adapter != null) {
-                empty.setText(getEmptyMessage());
-                empty.setVisibility(adapter.getItemCount() == 0 ? View.VISIBLE : View.GONE);
-            }
+            empty.setText(getEmptyMessage());
+            empty.setVisibility(adapter == null || adapter.getItemCount() == 0 ? View.VISIBLE : View.GONE);
         }
     }
 
@@ -148,6 +159,7 @@ public abstract class AbsLibraryPagerRecyclerViewFragment<A extends RecyclerView
 
     protected abstract LM createLayoutManager();
 
+    @NonNull
     protected abstract A createAdapter();
 
     @Override
diff --git a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AlbumsFragment.java b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AlbumsFragment.java
index 020d7f1e..445e044b 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AlbumsFragment.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/AlbumsFragment.java
@@ -1,19 +1,38 @@
 package com.kabouzeid.gramophone.ui.fragments.libraryfragments;
 
+import android.content.Context;
+import android.os.Bundle;
 import android.support.annotation.NonNull;
+import android.support.v4.app.LoaderManager;
+import android.support.v4.content.Loader;
 import android.support.v7.widget.GridLayoutManager;
 
 import com.kabouzeid.gramophone.R;
+import com.kabouzeid.gramophone.adapter.MusicLibraryPagerAdapter;
 import com.kabouzeid.gramophone.adapter.album.AlbumAdapter;
 import com.kabouzeid.gramophone.loader.AlbumLoader;
+import com.kabouzeid.gramophone.misc.WrappedAsyncTaskLoader;
+import com.kabouzeid.gramophone.model.Album;
 import com.kabouzeid.gramophone.util.PreferenceUtil;
 
+import java.util.ArrayList;
+
+import hugo.weaving.DebugLog;
+
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
-public class AlbumsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFragment<AlbumAdapter, GridLayoutManager> {
+public class AlbumsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFragment<AlbumAdapter, GridLayoutManager> implements LoaderManager.LoaderCallbacks<ArrayList<Album>> {
     public static final String TAG = AlbumsFragment.class.getSimpleName();
 
+    private static final int LOADER_ID = MusicLibraryPagerAdapter.MusicFragments.ALBUM.ordinal();
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        getLoaderManager().initLoader(LOADER_ID, null, this);
+    }
+
     @Override
     protected GridLayoutManager createLayoutManager() {
         return new GridLayoutManager(getActivity(), getGridSize());
@@ -23,10 +42,11 @@ public class AlbumsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFra
     @Override
     protected AlbumAdapter createAdapter() {
         int itemLayoutRes = getItemLayoutRes();
-        applyRecyclerViewPaddingForLayoutRes(itemLayoutRes);
+        notifyLayoutResChanged(itemLayoutRes);
+        ArrayList<Album> dataSet = getAdapter() == null ? new ArrayList<Album>() : getAdapter().getDataSet();
         return new AlbumAdapter(
                 getLibraryFragment().getMainActivity(),
-                AlbumLoader.getAllAlbums(getActivity()),
+                dataSet,
                 itemLayoutRes,
                 loadUsePalette(),
                 getLibraryFragment());
@@ -80,6 +100,36 @@ public class AlbumsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFra
 
     @Override
     public void onMediaStoreChanged() {
-        getAdapter().swapDataSet(AlbumLoader.getAllAlbums(getActivity()));
+        getLoaderManager().restartLoader(LOADER_ID, null, this);
+    }
+
+    @DebugLog
+    @Override
+    public Loader<ArrayList<Album>> onCreateLoader(int id, Bundle args) {
+        return new AsyncAlbumLoader(getActivity());
+    }
+
+    @DebugLog
+    @Override
+    public void onLoadFinished(Loader<ArrayList<Album>> loader, ArrayList<Album> data) {
+        getAdapter().swapDataSet(data);
+    }
+
+    @DebugLog
+    @Override
+    public void onLoaderReset(Loader<ArrayList<Album>> loader) {
+        getAdapter().swapDataSet(new ArrayList<Album>());
+    }
+
+    private static class AsyncAlbumLoader extends WrappedAsyncTaskLoader<ArrayList<Album>> {
+        public AsyncAlbumLoader(Context context) {
+            super(context);
+        }
+
+        @DebugLog
+        @Override
+        public ArrayList<Album> loadInBackground() {
+            return AlbumLoader.getAllAlbums(getContext());
+        }
     }
 }
diff --git a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/ArtistsFragment.java b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/ArtistsFragment.java
index 3be19fe8..c5ed76f3 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/ArtistsFragment.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/ArtistsFragment.java
@@ -1,20 +1,39 @@
 package com.kabouzeid.gramophone.ui.fragments.libraryfragments;
 
+import android.content.Context;
+import android.os.Bundle;
 import android.support.annotation.NonNull;
+import android.support.v4.app.LoaderManager;
+import android.support.v4.content.Loader;
 import android.support.v7.widget.GridLayoutManager;
 
 import com.kabouzeid.gramophone.R;
+import com.kabouzeid.gramophone.adapter.MusicLibraryPagerAdapter;
 import com.kabouzeid.gramophone.adapter.artist.ArtistAdapter;
 import com.kabouzeid.gramophone.loader.ArtistLoader;
+import com.kabouzeid.gramophone.misc.WrappedAsyncTaskLoader;
+import com.kabouzeid.gramophone.model.Artist;
 import com.kabouzeid.gramophone.util.PreferenceUtil;
 
+import java.util.ArrayList;
+
+import hugo.weaving.DebugLog;
+
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
-public class ArtistsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFragment<ArtistAdapter, GridLayoutManager> {
+public class ArtistsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFragment<ArtistAdapter, GridLayoutManager> implements LoaderManager.LoaderCallbacks<ArrayList<Artist>> {
 
     public static final String TAG = ArtistsFragment.class.getSimpleName();
 
+    private static final int LOADER_ID = MusicLibraryPagerAdapter.MusicFragments.ARTIST.ordinal();
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        getLoaderManager().initLoader(LOADER_ID, null, this);
+    }
+
     @NonNull
     @Override
     protected GridLayoutManager createLayoutManager() {
@@ -25,10 +44,11 @@ public class ArtistsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFr
     @Override
     protected ArtistAdapter createAdapter() {
         int itemLayoutRes = getItemLayoutRes();
-        applyRecyclerViewPaddingForLayoutRes(itemLayoutRes);
+        notifyLayoutResChanged(itemLayoutRes);
+        ArrayList<Artist> dataSet = getAdapter() == null ? new ArrayList<Artist>() : getAdapter().getDataSet();
         return new ArtistAdapter(
                 getLibraryFragment().getMainActivity(),
-                ArtistLoader.getAllArtists(getActivity()),
+                dataSet,
                 itemLayoutRes,
                 loadUsePalette(),
                 getLibraryFragment());
@@ -41,7 +61,7 @@ public class ArtistsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFr
 
     @Override
     public void onMediaStoreChanged() {
-        getAdapter().swapDataSet(ArtistLoader.getAllArtists(getActivity()));
+        getLoaderManager().restartLoader(LOADER_ID, null, this);
     }
 
     @Override
@@ -84,4 +104,34 @@ public class ArtistsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFr
         getLayoutManager().setSpanCount(gridSize);
         getAdapter().notifyDataSetChanged();
     }
+
+    @DebugLog
+    @Override
+    public Loader<ArrayList<Artist>> onCreateLoader(int id, Bundle args) {
+        return new AsyncArtistLoader(getActivity());
+    }
+
+    @DebugLog
+    @Override
+    public void onLoadFinished(Loader<ArrayList<Artist>> loader, ArrayList<Artist> data) {
+        getAdapter().swapDataSet(data);
+    }
+
+    @DebugLog
+    @Override
+    public void onLoaderReset(Loader<ArrayList<Artist>> loader) {
+        getAdapter().swapDataSet(new ArrayList<Artist>());
+    }
+
+    private static class AsyncArtistLoader extends WrappedAsyncTaskLoader<ArrayList<Artist>> {
+        public AsyncArtistLoader(Context context) {
+            super(context);
+        }
+
+        @DebugLog
+        @Override
+        public ArrayList<Artist> loadInBackground() {
+            return ArtistLoader.getAllArtists(getContext());
+        }
+    }
 }
diff --git a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/PlaylistsFragment.java b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/PlaylistsFragment.java
index d1d9ce89..be6acc5b 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/PlaylistsFragment.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/PlaylistsFragment.java
@@ -1,11 +1,17 @@
 package com.kabouzeid.gramophone.ui.fragments.libraryfragments;
 
+import android.content.Context;
+import android.os.Bundle;
 import android.support.annotation.NonNull;
+import android.support.v4.app.LoaderManager;
+import android.support.v4.content.Loader;
 import android.support.v7.widget.LinearLayoutManager;
 
 import com.kabouzeid.gramophone.R;
+import com.kabouzeid.gramophone.adapter.MusicLibraryPagerAdapter;
 import com.kabouzeid.gramophone.adapter.PlaylistAdapter;
 import com.kabouzeid.gramophone.loader.PlaylistLoader;
+import com.kabouzeid.gramophone.misc.WrappedAsyncTaskLoader;
 import com.kabouzeid.gramophone.model.Playlist;
 import com.kabouzeid.gramophone.model.smartplaylist.HistoryPlaylist;
 import com.kabouzeid.gramophone.model.smartplaylist.LastAddedPlaylist;
@@ -13,13 +19,23 @@ import com.kabouzeid.gramophone.model.smartplaylist.MyTopTracksPlaylist;
 
 import java.util.ArrayList;
 
+import hugo.weaving.DebugLog;
+
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
-public class PlaylistsFragment extends AbsLibraryPagerRecyclerViewFragment<PlaylistAdapter, LinearLayoutManager> {
+public class PlaylistsFragment extends AbsLibraryPagerRecyclerViewFragment<PlaylistAdapter, LinearLayoutManager> implements LoaderManager.LoaderCallbacks<ArrayList<Playlist>> {
 
     public static final String TAG = PlaylistsFragment.class.getSimpleName();
 
+    private static final int LOADER_ID = MusicLibraryPagerAdapter.MusicFragments.PLAYLIST.ordinal();
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        getLoaderManager().initLoader(LOADER_ID, null, this);
+    }
+
     @NonNull
     @Override
     protected LinearLayoutManager createLayoutManager() {
@@ -29,7 +45,8 @@ public class PlaylistsFragment extends AbsLibraryPagerRecyclerViewFragment<Playl
     @NonNull
     @Override
     protected PlaylistAdapter createAdapter() {
-        return new PlaylistAdapter(getLibraryFragment().getMainActivity(), getAllPlaylists(), R.layout.item_list_single_row, getLibraryFragment());
+        ArrayList<Playlist> dataSet = getAdapter() == null ? new ArrayList<Playlist>() : getAdapter().getDataSet();
+        return new PlaylistAdapter(getLibraryFragment().getMainActivity(), dataSet, R.layout.item_list_single_row, getLibraryFragment());
     }
 
     @Override
@@ -39,18 +56,48 @@ public class PlaylistsFragment extends AbsLibraryPagerRecyclerViewFragment<Playl
 
     @Override
     public void onMediaStoreChanged() {
-        getAdapter().swapDataSet(getAllPlaylists());
+        getLoaderManager().restartLoader(LOADER_ID, null, this);
     }
 
-    private ArrayList<Playlist> getAllPlaylists() {
-        ArrayList<Playlist> playlists = new ArrayList<>();
+    @DebugLog
+    @Override
+    public Loader<ArrayList<Playlist>> onCreateLoader(int id, Bundle args) {
+        return new AsyncPlaylistLoader(getActivity());
+    }
 
-        playlists.add(new LastAddedPlaylist(getActivity()));
-        playlists.add(new HistoryPlaylist(getActivity()));
-        playlists.add(new MyTopTracksPlaylist(getActivity()));
+    @DebugLog
+    @Override
+    public void onLoadFinished(Loader<ArrayList<Playlist>> loader, ArrayList<Playlist> data) {
+        getAdapter().swapDataSet(data);
+    }
 
-        playlists.addAll(PlaylistLoader.getAllPlaylists(getActivity()));
+    @DebugLog
+    @Override
+    public void onLoaderReset(Loader<ArrayList<Playlist>> loader) {
+        getAdapter().swapDataSet(new ArrayList<Playlist>());
+    }
 
-        return playlists;
+    private static class AsyncPlaylistLoader extends WrappedAsyncTaskLoader<ArrayList<Playlist>> {
+        public AsyncPlaylistLoader(Context context) {
+            super(context);
+        }
+
+        private static ArrayList<Playlist> getAllPlaylists(Context context) {
+            ArrayList<Playlist> playlists = new ArrayList<>();
+
+            playlists.add(new LastAddedPlaylist(context));
+            playlists.add(new HistoryPlaylist(context));
+            playlists.add(new MyTopTracksPlaylist(context));
+
+            playlists.addAll(PlaylistLoader.getAllPlaylists(context));
+
+            return playlists;
+        }
+
+        @DebugLog
+        @Override
+        public ArrayList<Playlist> loadInBackground() {
+            return getAllPlaylists(getContext());
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/SongsFragment.java b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/SongsFragment.java
index fd6d3411..9ba36a10 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/SongsFragment.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/ui/fragments/libraryfragments/SongsFragment.java
@@ -1,24 +1,40 @@
 package com.kabouzeid.gramophone.ui.fragments.libraryfragments;
 
+import android.content.Context;
+import android.os.Bundle;
 import android.support.annotation.NonNull;
+import android.support.v4.app.LoaderManager;
+import android.support.v4.content.Loader;
 import android.support.v7.widget.GridLayoutManager;
 
 import com.kabouzeid.gramophone.R;
+import com.kabouzeid.gramophone.adapter.MusicLibraryPagerAdapter;
 import com.kabouzeid.gramophone.adapter.song.ShuffleButtonSongAdapter;
 import com.kabouzeid.gramophone.adapter.song.SongAdapter;
 import com.kabouzeid.gramophone.loader.SongLoader;
+import com.kabouzeid.gramophone.misc.WrappedAsyncTaskLoader;
 import com.kabouzeid.gramophone.model.Song;
 import com.kabouzeid.gramophone.util.PreferenceUtil;
 
 import java.util.ArrayList;
 
+import hugo.weaving.DebugLog;
+
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
-public class SongsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFragment<SongAdapter, GridLayoutManager> {
+public class SongsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFragment<SongAdapter, GridLayoutManager> implements LoaderManager.LoaderCallbacks<ArrayList<Song>> {
 
     public static final String TAG = SongsFragment.class.getSimpleName();
 
+    private static final int LOADER_ID = MusicLibraryPagerAdapter.MusicFragments.SONG.ordinal();
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        getLoaderManager().initLoader(LOADER_ID, null, this);
+    }
+
     @NonNull
     @Override
     protected GridLayoutManager createLayoutManager() {
@@ -28,22 +44,22 @@ public class SongsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFrag
     @NonNull
     @Override
     protected SongAdapter createAdapter() {
-        ArrayList<Song> songs = SongLoader.getAllSongs(getActivity());
         int itemLayoutRes = getItemLayoutRes();
-        applyRecyclerViewPaddingForLayoutRes(itemLayoutRes);
+        notifyLayoutResChanged(itemLayoutRes);
         boolean usePalette = loadUsePalette();
+        ArrayList<Song> dataSet = getAdapter() == null ? new ArrayList<Song>() : getAdapter().getDataSet();
 
         if (getGridSize() <= getMaxGridSizeForList()) {
             return new ShuffleButtonSongAdapter(
                     getLibraryFragment().getMainActivity(),
-                    songs,
+                    dataSet,
                     itemLayoutRes,
                     usePalette,
                     getLibraryFragment());
         }
         return new SongAdapter(
                 getLibraryFragment().getMainActivity(),
-                songs,
+                dataSet,
                 itemLayoutRes,
                 usePalette,
                 getLibraryFragment());
@@ -56,7 +72,7 @@ public class SongsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFrag
 
     @Override
     public void onMediaStoreChanged() {
-        getAdapter().swapDataSet(SongLoader.getAllSongs(getActivity()));
+        getLoaderManager().restartLoader(LOADER_ID, null, this);
     }
 
     @Override
@@ -99,4 +115,34 @@ public class SongsFragment extends AbsLibraryPagerRecyclerViewCustomGridSizeFrag
         getLayoutManager().setSpanCount(gridSize);
         getAdapter().notifyDataSetChanged();
     }
+
+    @DebugLog
+    @Override
+    public Loader<ArrayList<Song>> onCreateLoader(int id, Bundle args) {
+        return new AsyncSongLoader(getActivity());
+    }
+
+    @DebugLog
+    @Override
+    public void onLoadFinished(Loader<ArrayList<Song>> loader, ArrayList<Song> data) {
+        getAdapter().swapDataSet(data);
+    }
+
+    @DebugLog
+    @Override
+    public void onLoaderReset(Loader<ArrayList<Song>> loader) {
+        getAdapter().swapDataSet(new ArrayList<Song>());
+    }
+
+    private static class AsyncSongLoader extends WrappedAsyncTaskLoader<ArrayList<Song>> {
+        public AsyncSongLoader(Context context) {
+            super(context);
+        }
+
+        @DebugLog
+        @Override
+        public ArrayList<Song> loadInBackground() {
+            return SongLoader.getAllSongs(getContext());
+        }
+    }
 }
diff --git a/app/src/main/java/com/kabouzeid/gramophone/util/MusicUtil.java b/app/src/main/java/com/kabouzeid/gramophone/util/MusicUtil.java
index f4dab6be..2f40558d 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/util/MusicUtil.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/util/MusicUtil.java
@@ -205,6 +205,10 @@ public class MusicUtil {
         }
     }
 
+    public static boolean isFavoritePlaylist(@NonNull final Context context, @NonNull final Playlist playlist) {
+        return playlist.name.equals(context.getString(R.string.favorites));
+    }
+
     public static Playlist getFavoritesPlaylist(@NonNull final Context context) {
         return PlaylistLoader.getPlaylist(context, context.getString(R.string.favorites));
     }
diff --git a/app/src/main/res/layout/sliding_music_panel_layout.xml b/app/src/main/res/layout/sliding_music_panel_layout.xml
index bd6e1511..4fc08fe4 100644
--- a/app/src/main/res/layout/sliding_music_panel_layout.xml
+++ b/app/src/main/res/layout/sliding_music_panel_layout.xml
@@ -5,7 +5,7 @@
     android:layout_height="match_parent"
     android:gravity="bottom"
     sothree:umanoOverlay="false"
-    sothree:umanoPanelHeight="@dimen/mini_player_height"
+    sothree:umanoPanelHeight="0dp"
     sothree:umanoShadowHeight="@dimen/card_elevation">
 
     <FrameLayout