Merged fastscroller from cabinet. Temporary fixed the wrong fab margins on KitKat and below caused by the google support design library. Added empty screens to Album Song and Artist views.

app/build.gradle

@@ -27,14 +27,10 @@ android {
         applicationId "com.kabouzeid.gramophone"
         minSdkVersion 16
         targetSdkVersion 22
-        versionCode 29
+        versionCode 30
-        versionName "0.9.13b DEV-3"
+        versionName "0.9.14b DEV"
     }
 
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_7
-        targetCompatibility JavaVersion.VERSION_1_7
-    }
     buildTypes {
         release {
             minifyEnabled true

app/src/main/java/com/kabouzeid/gramophone/adapter/AlbumAdapter.java

@@ -23,6 +23,8 @@ import com.kabouzeid.gramophone.dialogs.AddToPlaylistDialog;
 import com.kabouzeid.gramophone.dialogs.DeleteSongsDialog;
 import com.kabouzeid.gramophone.helper.MusicPlayerRemote;
 import com.kabouzeid.gramophone.interfaces.CabHolder;
+import com.kabouzeid.gramophone.interfaces.OnUpdatedListener;
+import com.kabouzeid.gramophone.interfaces.SelfUpdating;
 import com.kabouzeid.gramophone.loader.AlbumLoader;
 import com.kabouzeid.gramophone.loader.AlbumSongLoader;
 import com.kabouzeid.gramophone.model.Album;
@@ -47,12 +49,13 @@ import java.util.List;
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
-public class AlbumAdapter extends AbsMultiSelectAdapter<AlbumAdapter.ViewHolder, Album> {
+public class AlbumAdapter extends AbsMultiSelectAdapter<AlbumAdapter.ViewHolder, Album> implements SelfUpdating {
 
     public static final String TAG = AlbumAdapter.class.getSimpleName();
     private final AppCompatActivity activity;
     private boolean usePalette;
     private List<Album> dataSet;
+    private OnUpdatedListener listener;
 
     @Override
     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
@@ -130,6 +133,11 @@ public class AlbumAdapter extends AbsMultiSelectAdapter<AlbumAdapter.ViewHolder,
         return songs;
     }
 
+    @Override
+    public void setOnUpdatedListener(OnUpdatedListener listener) {
+        this.listener = listener;
+    }
+
     public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
         final ImageView albumArt;
         final TextView title;
@@ -193,6 +201,7 @@ public class AlbumAdapter extends AbsMultiSelectAdapter<AlbumAdapter.ViewHolder,
 
     private void loadDataSet() {
         dataSet = AlbumLoader.getAllAlbums(activity);
+        if (listener != null) listener.onUpdated(this);
     }
 
     private void applyPalette(Bitmap bitmap, final TextView title, final TextView artist, final View footer) {

app/src/main/java/com/kabouzeid/gramophone/adapter/ArtistAdapter.java

@@ -17,6 +17,8 @@ import com.kabouzeid.gramophone.dialogs.AddToPlaylistDialog;
 import com.kabouzeid.gramophone.dialogs.DeleteSongsDialog;
 import com.kabouzeid.gramophone.helper.MusicPlayerRemote;
 import com.kabouzeid.gramophone.interfaces.CabHolder;
+import com.kabouzeid.gramophone.interfaces.OnUpdatedListener;
+import com.kabouzeid.gramophone.interfaces.SelfUpdating;
 import com.kabouzeid.gramophone.lastfm.artist.LastFMArtistThumbnailUrlLoader;
 import com.kabouzeid.gramophone.loader.ArtistLoader;
 import com.kabouzeid.gramophone.loader.ArtistSongLoader;
@@ -36,9 +38,10 @@ import java.util.List;
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
-public class ArtistAdapter extends AbsMultiSelectAdapter<ArtistAdapter.ViewHolder, Artist> {
+public class ArtistAdapter extends AbsMultiSelectAdapter<ArtistAdapter.ViewHolder, Artist> implements SelfUpdating {
     protected final AppCompatActivity activity;
     protected List<Artist> dataSet;
+    private OnUpdatedListener listener;
 
     public ArtistAdapter(AppCompatActivity activity, @Nullable CabHolder cabHolder) {
         super(cabHolder, R.menu.menu_media_selection);
@@ -48,6 +51,7 @@ public class ArtistAdapter extends AbsMultiSelectAdapter<ArtistAdapter.ViewHolde
 
     private void loadDataSet() {
         dataSet = ArtistLoader.getAllArtists(activity);
+        if (listener != null) listener.onUpdated(this);
     }
 
     @Override
@@ -112,6 +116,11 @@ public class ArtistAdapter extends AbsMultiSelectAdapter<ArtistAdapter.ViewHolde
         return songs;
     }
 
+    @Override
+    public void setOnUpdatedListener(OnUpdatedListener listener) {
+        this.listener = listener;
+    }
+
     public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
         final TextView artistName;
         final TextView artistInfo;

app/src/main/java/com/kabouzeid/gramophone/adapter/PlaylistAdapter.java

@@ -18,6 +18,8 @@ import com.kabouzeid.gramophone.dialogs.DeletePlaylistDialog;
 import com.kabouzeid.gramophone.helper.MenuItemClickHelper;
 import com.kabouzeid.gramophone.helper.MusicPlayerRemote;
 import com.kabouzeid.gramophone.interfaces.CabHolder;
+import com.kabouzeid.gramophone.interfaces.OnUpdatedListener;
+import com.kabouzeid.gramophone.interfaces.SelfUpdating;
 import com.kabouzeid.gramophone.loader.PlaylistLoader;
 import com.kabouzeid.gramophone.loader.PlaylistSongLoader;
 import com.kabouzeid.gramophone.model.DataBaseChangedEvent;
@@ -33,11 +35,12 @@ import java.util.List;
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
-public class PlaylistAdapter extends AbsMultiSelectAdapter<PlaylistAdapter.ViewHolder, Playlist> {
+public class PlaylistAdapter extends AbsMultiSelectAdapter<PlaylistAdapter.ViewHolder, Playlist> implements SelfUpdating {
 
     public static final String TAG = PlaylistAdapter.class.getSimpleName();
     protected final AppCompatActivity activity;
     protected List<Playlist> dataSet;
+    private OnUpdatedListener listener;
 
     public PlaylistAdapter(AppCompatActivity activity, @Nullable CabHolder cabHolder) {
         super(cabHolder, R.menu.menu_playlists_selection);
@@ -47,6 +50,7 @@ public class PlaylistAdapter extends AbsMultiSelectAdapter<PlaylistAdapter.ViewH
 
     public void loadDataSet() {
         dataSet = PlaylistLoader.getAllPlaylists(activity);
+        if (listener != null) listener.onUpdated(this);
     }
 
     @Override
@@ -95,6 +99,11 @@ public class PlaylistAdapter extends AbsMultiSelectAdapter<PlaylistAdapter.ViewH
         return songs;
     }
 
+    @Override
+    public void setOnUpdatedListener(OnUpdatedListener listener) {
+        this.listener = listener;
+    }
+
     public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
         public final TextView playlistName;
         private final View menu;

app/src/main/java/com/kabouzeid/gramophone/adapter/songadapter/SongAdapter.java

@@ -22,6 +22,8 @@ import com.kabouzeid.gramophone.dialogs.DeleteSongsDialog;
 import com.kabouzeid.gramophone.helper.MenuItemClickHelper;
 import com.kabouzeid.gramophone.helper.MusicPlayerRemote;
 import com.kabouzeid.gramophone.interfaces.CabHolder;
+import com.kabouzeid.gramophone.interfaces.OnUpdatedListener;
+import com.kabouzeid.gramophone.interfaces.SelfUpdating;
 import com.kabouzeid.gramophone.loader.SongLoader;
 import com.kabouzeid.gramophone.model.DataBaseChangedEvent;
 import com.kabouzeid.gramophone.model.Song;
@@ -37,7 +39,7 @@ import java.util.ArrayList;
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
-public class SongAdapter extends AbsMultiSelectAdapter<SongAdapter.ViewHolder, Song> implements MaterialCab.Callback {
+public class SongAdapter extends AbsMultiSelectAdapter<SongAdapter.ViewHolder, Song> implements MaterialCab.Callback, SelfUpdating {
 
     public static final String TAG = AlbumSongAdapter.class.getSimpleName();
     private static final int SHUFFLE_BUTTON = 0;
@@ -45,6 +47,7 @@ public class SongAdapter extends AbsMultiSelectAdapter<SongAdapter.ViewHolder, S
 
     protected final AppCompatActivity activity;
     protected ArrayList<Song> dataSet;
+    private OnUpdatedListener listener;
 
     public SongAdapter(AppCompatActivity activity, CabHolder cabHolder) {
         super(cabHolder, R.menu.menu_media_selection);
@@ -54,6 +57,7 @@ public class SongAdapter extends AbsMultiSelectAdapter<SongAdapter.ViewHolder, S
 
     private void loadDataSet() {
         dataSet = SongLoader.getAllSongs(activity);
+        if (listener != null) listener.onUpdated(this);
     }
 
     @Override
@@ -101,7 +105,8 @@ public class SongAdapter extends AbsMultiSelectAdapter<SongAdapter.ViewHolder, S
 
     @Override
     public int getItemCount() {
-        return dataSet.size() + 1;
+        final int dataSetSize = dataSet.size();
+        return dataSetSize > 0 ? dataSetSize + 1 : 0;
     }
 
     @Override
@@ -124,6 +129,11 @@ public class SongAdapter extends AbsMultiSelectAdapter<SongAdapter.ViewHolder, S
         }
     }
 
+    @Override
+    public void setOnUpdatedListener(OnUpdatedListener listener) {
+        this.listener = listener;
+    }
+
     public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
         final TextView songTitle;
         final TextView songInfo;

app/src/main/java/com/kabouzeid/gramophone/interfaces/OnUpdatedListener.java

@@ -0,0 +1,9 @@
+package com.kabouzeid.gramophone.interfaces;
+
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
+public interface OnUpdatedListener {
+
+    void onUpdated(SelfUpdating selfUpdating);
+}

app/src/main/java/com/kabouzeid/gramophone/interfaces/SelfUpdating.java

@@ -0,0 +1,9 @@
+package com.kabouzeid.gramophone.interfaces;
+
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
+public interface SelfUpdating {
+
+    void setOnUpdatedListener(OnUpdatedListener listener);
+}

app/src/main/java/com/kabouzeid/gramophone/ui/fragments/mainactivityfragments/AbsMainActivityFragment.java

@@ -3,7 +3,6 @@ package com.kabouzeid.gramophone.ui.fragments.mainactivityfragments;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
 
-import com.kabouzeid.gramophone.R;
 import com.kabouzeid.gramophone.interfaces.KabViewsDisableAble;
 import com.kabouzeid.gramophone.ui.activities.MainActivity;
 
@@ -13,14 +12,6 @@ import com.kabouzeid.gramophone.ui.activities.MainActivity;
 public abstract class AbsMainActivityFragment extends Fragment implements KabViewsDisableAble {
     private boolean areViewsEnabled;
 
-    protected int getTopPadding() {
-        return getResources().getDimensionPixelSize(R.dimen.list_padding_vertical);
-    }
-
-    protected int getBottomPadding() {
-        return getResources().getDimensionPixelSize(R.dimen.bottom_offset_fab_activity);
-    }
-
     protected MainActivity getMainActivity() {
         return (MainActivity) getActivity();
     }

app/src/main/java/com/kabouzeid/gramophone/ui/fragments/mainactivityfragments/AbsMainActivityRecyclerViewFragment.java

@@ -1,17 +1,23 @@
 package com.kabouzeid.gramophone.ui.fragments.mainactivityfragments;
 
 import android.os.Bundle;
+import android.support.annotation.StringRes;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.TextView;
 
 import com.kabouzeid.gramophone.R;
+import com.kabouzeid.gramophone.interfaces.OnUpdatedListener;
+import com.kabouzeid.gramophone.interfaces.SelfUpdating;
+import com.kabouzeid.gramophone.views.FastScroller;
 
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
-public abstract class AbsMainActivityRecyclerViewFragment extends AbsMainActivityFragment {
+public abstract class AbsMainActivityRecyclerViewFragment extends AbsMainActivityFragment implements OnUpdatedListener {
 
     public static final String TAG = AbsMainActivityRecyclerViewFragment.class.getSimpleName();
     private RecyclerView recyclerView;
@@ -19,20 +25,35 @@ public abstract class AbsMainActivityRecyclerViewFragment extends AbsMainActivit
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
-        return inflater.inflate(getLayoutResId(), container, false);
+        return inflater.inflate(R.layout.fragment_main_activity_recycler_view, container, false);
     }
 
     @Override
     public void onViewCreated(View view, Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
+
         recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
+
+        final FastScroller fastScroller = (FastScroller) view.findViewById(R.id.fast_scroller);
+        fastScroller.setRecyclerView(recyclerView);
+        fastScroller.setOnHandleTouchListener(new View.OnTouchListener() {
+            @Override
+            public boolean onTouch(View v, MotionEvent event) {
+                return false;
+            }
+        });
+        fastScroller.setPressedHandleColor(getMainActivity().getThemeColorPrimary());
+
         setUpRecyclerView();
+
+        checkAndProcessAdapterSize();
     }
 
     private void setUpRecyclerView() {
-        recyclerView.setLayoutManager(createLayoutManager());
-        recyclerView.setPadding(0, getTopPadding(), 0, getBottomPadding());
         mAdapter = createAdapter();
+        if (mAdapter instanceof SelfUpdating) ((SelfUpdating) mAdapter).setOnUpdatedListener(this);
+
+        recyclerView.setLayoutManager(createLayoutManager());
         recyclerView.setAdapter(mAdapter);
     }
 
@@ -52,9 +73,28 @@ public abstract class AbsMainActivityRecyclerViewFragment extends AbsMainActivit
         recyclerView.setEnabled(false);
     }
 
-    protected abstract int getLayoutResId();
+    private void checkAndProcessAdapterSize() {
+        final View v = getView();
+        RecyclerView.Adapter adapter = getAdapter();
+        if (adapter != null && v != null) {
+            final TextView emptyTextView = (TextView) v.findViewById(android.R.id.empty);
+
+            emptyTextView.setText(getEmptyMessage());
+            emptyTextView.setVisibility(adapter.getItemCount() == 0 ? View.VISIBLE : View.GONE);
+        }
+    }
+
+    @StringRes
+    protected int getEmptyMessage() {
+        return R.string.nothing_here;
+    }
 
     protected abstract RecyclerView.LayoutManager createLayoutManager();
 
     protected abstract RecyclerView.Adapter createAdapter();
+
+    @Override
+    public void onUpdated(SelfUpdating selfUpdating) {
+        checkAndProcessAdapterSize();
+    }
 }

app/src/main/java/com/kabouzeid/gramophone/ui/fragments/mainactivityfragments/AlbumViewFragment.java

@@ -16,11 +16,6 @@ public class AlbumViewFragment extends AbsMainActivityRecyclerViewFragment {
 
     private GridLayoutManager layoutManager;
 
-    @Override
-    protected int getLayoutResId() {
-        return R.layout.fragment_album_view;
-    }
-
     @Override
     protected RecyclerView.LayoutManager createLayoutManager() {
         int columns = Util.isInPortraitMode(getActivity()) ? PreferenceUtils.getInstance(getActivity()).getAlbumGridColumns() : PreferenceUtils.getInstance(getActivity()).getAlbumGridColumnsLand();
@@ -33,6 +28,11 @@ public class AlbumViewFragment extends AbsMainActivityRecyclerViewFragment {
         return new AlbumAdapter(getMainActivity(), getMainActivity());
     }
 
+    @Override
+    protected int getEmptyMessage() {
+        return R.string.no_albums;
+    }
+
     public void setColumns(int columns) {
         layoutManager.setSpanCount(columns);
         layoutManager.requestLayout();

app/src/main/java/com/kabouzeid/gramophone/ui/fragments/mainactivityfragments/ArtistViewFragment.java

@@ -1,19 +1,17 @@
 package com.kabouzeid.gramophone.ui.fragments.mainactivityfragments;
 
-
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 
 import com.kabouzeid.gramophone.R;
 import com.kabouzeid.gramophone.adapter.ArtistAdapter;
 
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
 public class ArtistViewFragment extends AbsMainActivityRecyclerViewFragment {
-    public static final String TAG = ArtistViewFragment.class.getSimpleName();
 
-    @Override
+    public static final String TAG = ArtistViewFragment.class.getSimpleName();
-    protected int getLayoutResId() {
-        return R.layout.fragment_artist_view;
-    }
 
     @Override
     protected RecyclerView.LayoutManager createLayoutManager() {
@@ -24,4 +22,9 @@ public class ArtistViewFragment extends AbsMainActivityRecyclerViewFragment {
     protected RecyclerView.Adapter createAdapter() {
         return new ArtistAdapter(getMainActivity(), getMainActivity());
     }
+
+    @Override
+    protected int getEmptyMessage() {
+        return R.string.no_artists;
+    }
 }

app/src/main/java/com/kabouzeid/gramophone/ui/fragments/mainactivityfragments/PlaylistViewFragment.java

@@ -1,68 +1,30 @@
 package com.kabouzeid.gramophone.ui.fragments.mainactivityfragments;
 
-
-import android.os.Bundle;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
-import android.view.View;
 
-import com.kabouzeid.gramophone.App;
 import com.kabouzeid.gramophone.R;
 import com.kabouzeid.gramophone.adapter.PlaylistAdapter;
-import com.kabouzeid.gramophone.model.DataBaseChangedEvent;
-import com.squareup.otto.Subscribe;
 
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
 public class PlaylistViewFragment extends AbsMainActivityRecyclerViewFragment {
 
     public static final String TAG = PlaylistViewFragment.class.getSimpleName();
 
-    @Override
-    protected int getLayoutResId() {
-        return R.layout.fragment_playlist_view;
-    }
-
     @Override
     protected RecyclerView.LayoutManager createLayoutManager() {
         return new GridLayoutManager(getActivity(), 1);
     }
 
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        App.bus.register(this);
-    }
-
-    @Override
-    public void onDestroy() {
-        super.onDestroy();
-        App.bus.unregister(this);
-    }
-
     @Override
     protected RecyclerView.Adapter createAdapter() {
-        PlaylistAdapter adapter = new PlaylistAdapter(getMainActivity(), getMainActivity());
+        return new PlaylistAdapter(getMainActivity(), getMainActivity());
-        View v = getView();
-        if (v != null) {
-            v.findViewById(android.R.id.empty).setVisibility(
-                    adapter.getItemCount() == 0 ? View.VISIBLE : View.GONE);
-        }
-        return adapter;
     }
 
-    @Subscribe
+    @Override
-    public void onDataBaseEvent(DataBaseChangedEvent event) {
+    protected int getEmptyMessage() {
-        switch (event.getAction()) {
+        return R.string.no_playlists;
-            case DataBaseChangedEvent.PLAYLISTS_CHANGED:
-            case DataBaseChangedEvent.DATABASE_CHANGED:
-                PlaylistAdapter adapter = (PlaylistAdapter) getAdapter();
-                adapter.loadDataSet();
-                adapter.notifyDataSetChanged();
-                View v = getView();
-                if (v != null) {
-                    v.findViewById(android.R.id.empty).setVisibility(
-                            adapter.getItemCount() == 0 ? View.VISIBLE : View.GONE);
-                }
-                break;
-        }
     }
 }

app/src/main/java/com/kabouzeid/gramophone/ui/fragments/mainactivityfragments/SongViewFragment.java

@@ -13,11 +13,6 @@ public class SongViewFragment extends AbsMainActivityRecyclerViewFragment {
 
     public static final String TAG = SongViewFragment.class.getSimpleName();
 
-    @Override
-    protected int getLayoutResId() {
-        return R.layout.fragment_songview;
-    }
-
     @Override
     protected RecyclerView.LayoutManager createLayoutManager() {
         return new GridLayoutManager(getActivity(), 1);
@@ -27,4 +22,9 @@ public class SongViewFragment extends AbsMainActivityRecyclerViewFragment {
     protected RecyclerView.Adapter createAdapter() {
         return new SongAdapter(getMainActivity(), getMainActivity());
     }
+
+    @Override
+    protected int getEmptyMessage() {
+        return R.string.no_songs;
+    }
 }

app/src/main/java/com/kabouzeid/gramophone/util/Util.java

@@ -238,4 +238,12 @@ public class Util {
                 new int[]{color}
         );
     }
+
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
+    public static boolean isRTL(Context context) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+            Configuration config = context.getResources().getConfiguration();
+            return config.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
+        } else return false;
+    }
 }

app/src/main/java/com/kabouzeid/gramophone/views/FastScroller.java

@@ -0,0 +1,248 @@
+package com.kabouzeid.gramophone.views;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
+import android.content.Context;
+import android.graphics.Color;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.InsetDrawable;
+import android.graphics.drawable.StateListDrawable;
+import android.support.v4.view.animation.FastOutLinearInInterpolator;
+import android.support.v4.view.animation.LinearOutSlowInInterpolator;
+import android.support.v7.widget.RecyclerView;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.FrameLayout;
+
+import com.kabouzeid.gramophone.R;
+import com.kabouzeid.gramophone.util.Util;
+
+/**
+ * Defines a basic widget that will allow for fast scrolling a RecyclerView using the basic paradigm of
+ * a handle and a bar.
+ */
+public class FastScroller extends FrameLayout {
+
+    /**
+     * The long bar along which a handle travels
+     */
+    protected final View mBar;
+    /**
+     * The handle that signifies the user's progress in the list
+     */
+    protected final View mHandle;
+    protected RecyclerView.OnScrollListener mOnScrollListener;
+    protected OnTouchListener mOnTouchListener;
+    private RecyclerView mRecyclerView;
+    private AnimatorSet mAnimator;
+    private boolean animatingIn;
+    private final Runnable mHide;
+    private final int mMinScrollHandleHeight;
+    private final int mHiddenTranslationX;
+
+    public FastScroller(Context context) {
+        this(context, null, 0);
+    }
+
+    public FastScroller(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public FastScroller(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+
+        inflate(context, R.layout.vertical_recycler_fast_scroller_layout, this);
+
+        mBar = findViewById(R.id.scroll_bar);
+        mHandle = findViewById(R.id.scroll_handle);
+        mMinScrollHandleHeight = getResources().getDimensionPixelSize(R.dimen.min_scrollhandle_height);
+
+        mHiddenTranslationX = (Util.isRTL(getContext()) ? -1 : 1) * getResources().getDimensionPixelSize(R.dimen.scrollbar_width);
+        mHide = new Runnable() {
+            @Override
+            public void run() {
+                if (!mHandle.isPressed()) {
+                    if (mAnimator != null && mAnimator.isStarted()) {
+                        mAnimator.cancel();
+                    }
+                    mAnimator = new AnimatorSet();
+                    ObjectAnimator animator2 = ObjectAnimator.ofFloat(FastScroller.this, View.TRANSLATION_X,
+                            mHiddenTranslationX);
+                    animator2.setInterpolator(new FastOutLinearInInterpolator());
+                    animator2.setDuration(150);
+                    mHandle.setEnabled(false);
+                    mAnimator.play(animator2);
+                    mAnimator.start();
+                }
+            }
+        };
+
+        mHandle.setOnTouchListener(new OnTouchListener() {
+            private float mInitialBarHeight;
+            private float mLastPressedYAdjustedToInitial;
+
+            @Override
+            public boolean onTouch(View v, MotionEvent event) {
+                mOnTouchListener.onTouch(v, event);
+                if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
+                    mHandle.setPressed(true);
+
+                    mInitialBarHeight = mBar.getHeight();
+                    mLastPressedYAdjustedToInitial = event.getY() + mHandle.getY() + mBar.getY();
+                } else if (event.getActionMasked() == MotionEvent.ACTION_MOVE) {
+                    float newHandlePressedY = event.getY() + mHandle.getY() + mBar.getY();
+                    int barHeight = mBar.getHeight();
+                    float newHandlePressedYAdjustedToInitial =
+                            newHandlePressedY + (mInitialBarHeight - barHeight);
+
+                    float deltaPressedYFromLastAdjustedToInitial =
+                            newHandlePressedYAdjustedToInitial - mLastPressedYAdjustedToInitial;
+
+                    int dY = (int) ((deltaPressedYFromLastAdjustedToInitial / mInitialBarHeight) *
+                            (mRecyclerView.computeVerticalScrollRange()));
+
+                    updateRvScroll(dY);
+
+                    mLastPressedYAdjustedToInitial = newHandlePressedYAdjustedToInitial;
+                } else if (event.getActionMasked() == MotionEvent.ACTION_UP) {
+                    mLastPressedYAdjustedToInitial = -1;
+
+                    mHandle.setPressed(false);
+                    postAutoHide();
+                }
+
+                return true;
+            }
+        });
+
+        setTranslationX(mHiddenTranslationX);
+
+        //Default selected handle color
+        setPressedHandleColor(Color.BLACK);
+        setUpBarBackground();
+    }
+
+    /**
+     * Provides the ability to programmatically set the color of the fast scroller's handle
+     */
+    public void setPressedHandleColor(int accent) {
+        StateListDrawable drawable = new StateListDrawable();
+
+        int colorControlNormal = Util.resolveColor(getContext(), R.attr.colorControlNormal);
+
+        if (!Util.isRTL(getContext())) {
+            drawable.addState(View.PRESSED_ENABLED_STATE_SET,
+                    new InsetDrawable(new ColorDrawable(accent), getResources().getDimensionPixelSize(R.dimen.scrollbar_inset), 0, 0, 0));
+            drawable.addState(View.EMPTY_STATE_SET,
+                    new InsetDrawable(new ColorDrawable(colorControlNormal), getResources().getDimensionPixelSize(R.dimen.scrollbar_inset), 0, 0, 0));
+        } else {
+            drawable.addState(View.PRESSED_ENABLED_STATE_SET,
+                    new InsetDrawable(new ColorDrawable(accent), 0, getResources().getDimensionPixelSize(R.dimen.scrollbar_inset), 0, 0));
+            drawable.addState(View.EMPTY_STATE_SET,
+                    new InsetDrawable(new ColorDrawable(colorControlNormal), 0, getResources().getDimensionPixelSize(R.dimen.scrollbar_inset), 0, 0));
+        }
+        mHandle.setBackground(drawable);
+    }
+
+    private void setUpBarBackground() {
+        Drawable drawable;
+
+        int colorControlNormal = Util.resolveColor(getContext(), R.attr.colorControlNormal);
+
+        if (!Util.isRTL(getContext())) {
+            drawable = new InsetDrawable(new ColorDrawable(colorControlNormal), getResources().getDimensionPixelSize(R.dimen.scrollbar_inset), 0, 0, 0);
+        } else {
+            drawable = new InsetDrawable(new ColorDrawable(colorControlNormal), 0, getResources().getDimensionPixelSize(R.dimen.scrollbar_inset), 0, 0);
+        }
+        mBar.setBackground(drawable);
+    }
+
+    public void setRecyclerView(RecyclerView recyclerView) {
+        mRecyclerView = recyclerView;
+        initRecyclerViewOnScrollListener();
+    }
+
+    public void initRecyclerViewOnScrollListener() {
+        mOnScrollListener = new RecyclerView.OnScrollListener() {
+            @Override
+            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+                super.onScrolled(recyclerView, dx, dy);
+                requestLayout();
+
+                mHandle.setEnabled(true);
+                if (!animatingIn && getTranslationX() != 0) {
+                    if (mAnimator != null && mAnimator.isStarted()) {
+                        mAnimator.cancel();
+                    }
+                    mAnimator = new AnimatorSet();
+                    ObjectAnimator animator = ObjectAnimator.ofFloat(FastScroller.this, View.TRANSLATION_X, 0);
+                    animator.setInterpolator(new LinearOutSlowInInterpolator());
+                    animator.setDuration(100);
+                    animator.addListener(new AnimatorListenerAdapter() {
+                        @Override
+                        public void onAnimationEnd(Animator animation) {
+                            super.onAnimationEnd(animation);
+                            animatingIn = false;
+                        }
+                    });
+                    animatingIn = true;
+                    mAnimator.play(animator);
+                    mAnimator.start();
+                }
+                postAutoHide();
+            }
+        };
+        mRecyclerView.addOnScrollListener(mOnScrollListener);
+    }
+
+    public void setOnHandleTouchListener(OnTouchListener listener) {
+        mOnTouchListener = listener;
+    }
+
+    private void postAutoHide() {
+        if (mRecyclerView != null) {
+            mRecyclerView.removeCallbacks(mHide);
+            mRecyclerView.postDelayed(mHide, 1500);
+        }
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        super.onLayout(changed, left, top, right, bottom);
+
+        int scrollOffset = mRecyclerView.computeVerticalScrollOffset();
+        int verticalScrollRange = mRecyclerView.computeVerticalScrollRange()
+                + mRecyclerView.getPaddingBottom();
+
+        int barHeight = mBar.getHeight();
+        float ratio = (float) scrollOffset / (verticalScrollRange - barHeight);
+
+        int calculatedHandleHeight = (int) ((float) barHeight / verticalScrollRange * barHeight);
+        if (calculatedHandleHeight < mMinScrollHandleHeight) {
+            calculatedHandleHeight = mMinScrollHandleHeight;
+        }
+
+        if (calculatedHandleHeight >= barHeight) {
+            setTranslationX(mHiddenTranslationX);
+            return;
+        }
+
+        float y = ratio * (barHeight - calculatedHandleHeight);
+
+        mHandle.layout(mHandle.getLeft(), (int) y, mHandle.getRight(), (int) y + calculatedHandleHeight);
+    }
+
+    public void updateRvScroll(int dY) {
+        if (mRecyclerView != null && mHandle != null) {
+            try {
+                mRecyclerView.scrollBy(0, dY);
+            } catch (Throwable t) {
+                t.printStackTrace();
+            }
+        }
+    }
+}

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

@@ -1,12 +1,12 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-             xmlns:tools="http://schemas.android.com/tools"
+    xmlns:tools="http://schemas.android.com/tools"
-             android:layout_width="match_parent"
+    android:layout_width="match_parent"
-             android:layout_height="match_parent">
+    android:layout_height="match_parent">
 
     <FrameLayout
-        android:background="?android:colorBackground"
         android:layout_width="match_parent"
-        android:layout_height="@dimen/header_image_height">
+        android:layout_height="@dimen/header_image_height"
+        android:background="?android:colorBackground">
 
         <ImageView
             android:id="@+id/album_art_background"
@@ -98,6 +98,6 @@
         android:id="@+id/fab"
         style="@style/PlayPauseFab"
         android:layout_gravity="end|right|bottom"
-        android:layout_margin="16dp" />
+        android:layout_margin="@dimen/fab_margin" />
 
 </FrameLayout>

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

@@ -1,10 +1,10 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-             xmlns:tools="http://schemas.android.com/tools"
+    xmlns:tools="http://schemas.android.com/tools"
-             android:layout_width="match_parent"
+    android:layout_width="match_parent"
-             android:layout_height="match_parent"
+    android:layout_height="match_parent"
-             android:fitsSystemWindows="true"
+    android:fitsSystemWindows="true"
-             android:focusable="true"
+    android:focusable="true"
-             android:focusableInTouchMode="true">
+    android:focusableInTouchMode="true">
 
     <com.github.ksoichiro.android.observablescrollview.ObservableScrollView
         android:id="@+id/observableScrollView"
@@ -26,6 +26,7 @@
                 android:id="@+id/header"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
+                android:layout_below="@+id/image"
                 android:elevation="@dimen/toolbar_elevation"
                 android:minHeight="@dimen/title_view_height"
                 android:orientation="vertical"
@@ -33,8 +34,7 @@
                 android:paddingLeft="16dp"
                 android:paddingRight="16dp"
                 android:paddingTop="8dp"
-                tools:ignore="UnusedAttribute"
+                tools:ignore="UnusedAttribute">
-                android:layout_below="@+id/image">
 
                 <android.support.design.widget.TextInputLayout
                     android:layout_width="match_parent"
@@ -139,7 +139,7 @@
         android:id="@+id/fab"
         style="@style/PlayPauseFab"
         android:layout_gravity="bottom|right|end"
-        android:layout_margin="16dp"
+        android:layout_margin="@dimen/fab_margin"
         android:src="@drawable/ic_done_white_24dp"
         tools:ignore="RtlHardcoded" />
 

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

@@ -1,13 +1,13 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-             xmlns:tools="http://schemas.android.com/tools"
+    xmlns:tools="http://schemas.android.com/tools"
-             android:layout_width="match_parent"
+    android:layout_width="match_parent"
-             android:layout_height="match_parent">
+    android:layout_height="match_parent">
 
 
     <FrameLayout
-        android:background="?android:colorBackground"
         android:layout_width="match_parent"
-        android:layout_height="@dimen/header_image_height">
+        android:layout_height="@dimen/header_image_height"
+        android:background="?android:colorBackground">
 
         <ImageView
             android:id="@+id/artist_image_background"
@@ -99,6 +99,6 @@
         android:id="@+id/fab"
         style="@style/PlayPauseFab"
         android:layout_gravity="end|right|bottom"
-        android:layout_margin="16dp" />
+        android:layout_margin="@dimen/fab_margin" />
 
 </FrameLayout>

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

@@ -1,8 +1,8 @@
 <android.support.v4.widget.DrawerLayout
-    android:id="@+id/drawer_layout"
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/drawer_layout"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:fitsSystemWindows="true"
@@ -19,9 +19,9 @@
             android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
 
             <FrameLayout
-                app:layout_scrollFlags="scroll|enterAlways"
                 android:layout_width="match_parent"
-                android:layout_height="wrap_content">
+                android:layout_height="wrap_content"
+                app:layout_scrollFlags="scroll|enterAlways">
 
                 <android.support.v7.widget.Toolbar
                     android:id="@+id/toolbar"
@@ -59,7 +59,7 @@
             android:id="@+id/fab"
             style="@style/PlayPauseFab"
             android:layout_gravity="end|bottom"
-            android:layout_margin="16dp" />
+            android:layout_margin="@dimen/fab_margin" />
 
     </android.support.design.widget.CoordinatorLayout>
 

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

@@ -1,18 +1,18 @@
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 
-                xmlns:tools="http://schemas.android.com/tools"
+    xmlns:tools="http://schemas.android.com/tools"
-                android:layout_width="match_parent"
+    android:layout_width="match_parent"
-                android:layout_height="match_parent"
+    android:layout_height="match_parent"
-                tools:context="com.kabouzeid.gramophone.ui.activities.MusicControllerActivity">
+    tools:context="com.kabouzeid.gramophone.ui.activities.MusicControllerActivity">
 
     <!-- BOTTOM-->
 
     <LinearLayout
-        android:background="?android:colorBackground"
         android:id="@+id/footer_frame"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true"
+        android:background="?android:colorBackground"
         android:orientation="vertical">
 
         <RelativeLayout
@@ -166,7 +166,8 @@
             <android.support.design.widget.FloatingActionButton
                 android:id="@+id/fab"
                 style="@style/PlayPauseFab"
-                android:layout_centerInParent="true" />
+                android:layout_centerInParent="true"
+                android:layout_margin="@dimen/tmp_no_fab_margin" />
 
         </RelativeLayout>
 

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

@@ -1,6 +1,6 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-             android:layout_width="match_parent"
+    android:layout_width="match_parent"
-             android:layout_height="match_parent">
+    android:layout_height="match_parent">
 
     <LinearLayout
         android:layout_width="match_parent"
@@ -49,6 +49,6 @@
         android:id="@+id/fab"
         style="@style/PlayPauseFab"
         android:layout_gravity="bottom|end"
-        android:layout_margin="16dp" />
+        android:layout_margin="@dimen/fab_margin" />
 
 </FrameLayout>

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

@@ -1,10 +1,10 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-             xmlns:tools="http://schemas.android.com/tools"
+    xmlns:tools="http://schemas.android.com/tools"
-             android:layout_width="match_parent"
+    android:layout_width="match_parent"
-             android:layout_height="match_parent"
+    android:layout_height="match_parent"
-             android:fitsSystemWindows="true"
+    android:fitsSystemWindows="true"
-             android:focusable="true"
+    android:focusable="true"
-             android:focusableInTouchMode="true">
+    android:focusableInTouchMode="true">
 
     <com.github.ksoichiro.android.observablescrollview.ObservableScrollView
         android:id="@+id/observableScrollView"
@@ -85,8 +85,7 @@
 
                 <android.support.design.widget.TextInputLayout
                     android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
+                    android:layout_height="wrap_content">
-                    >
 
                     <EditText
                         android:id="@+id/artist"
@@ -105,8 +104,7 @@
 
                 <android.support.design.widget.TextInputLayout
                     android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
+                    android:layout_height="wrap_content">
-                    >
 
                     <EditText
                         android:id="@+id/genre"
@@ -125,8 +123,7 @@
 
                 <android.support.design.widget.TextInputLayout
                     android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
+                    android:layout_height="wrap_content">
-                    >
 
                     <EditText
                         android:id="@+id/year"
@@ -146,8 +143,7 @@
 
                 <android.support.design.widget.TextInputLayout
                     android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
+                    android:layout_height="wrap_content">
-                    >
 
                     <EditText
                         android:id="@+id/track_number"
@@ -181,7 +177,7 @@
         android:id="@+id/fab"
         style="@style/PlayPauseFab"
         android:layout_gravity="bottom|right|end"
-        android:layout_margin="16dp"
+        android:layout_margin="@dimen/fab_margin"
         android:src="@drawable/ic_done_white_24dp"
         tools:ignore="RtlHardcoded" />
 

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

@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-    android:id="@+id/fragment_album_view"
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent">
-
-    <android.support.v7.widget.RecyclerView
-        android:id="@+id/recycler_view"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:clipToPadding="false"
-        android:scrollbars="vertical" />
-
-</LinearLayout>
-
-
-
-

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

@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-    android:id="@+id/fragment_album_view"
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent">
-
-    <android.support.v7.widget.RecyclerView
-        android:id="@+id/recycler_view"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:clipToPadding="false"
-        android:scrollbars="vertical" />
-
-</LinearLayout>

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

@@ -1,18 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/fragment_song_view"
-    xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
     <android.support.v7.widget.RecyclerView
+        android:paddingTop="@dimen/list_padding_vertical"
+        android:paddingBottom="@dimen/bottom_offset_fab_activity"
         android:id="@+id/recycler_view"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:clipToPadding="false"
-        android:dividerHeight="0px"
+        android:scrollbars="none" />
-        android:divider="@null"
-        android:scrollbars="vertical" />
 
     <TextView
         android:id="@android:id/empty"
@@ -21,7 +19,13 @@
         android:textSize="@dimen/empty_text_size"
         android:textColor="?android:textColorSecondary"
         android:fontFamily="sans-serif-light"
-        android:text="@string/no_playlists"
+        android:text="@string/nothing_here"
         android:layout_gravity="center" />
 
+    <com.kabouzeid.gramophone.views.FastScroller
+        android:id="@+id/fast_scroller"
+        android:layout_gravity="end"
+        android:layout_width="wrap_content"
+        android:layout_height="match_parent" />
+
 </FrameLayout>

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

@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-    android:id="@+id/fragment_song_view"
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent">
-
-    <android.support.v7.widget.RecyclerView
-        android:listSelector="?rect_selector"
-        android:id="@+id/recycler_view"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:clipToPadding="false"
-        android:dividerHeight="0px"
-        android:divider="@null"
-        android:scrollbars="vertical" />
-
-</LinearLayout>

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

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="48dp"
+    android:layout_height="match_parent"
+    tools:layout_gravity="end">
+
+    <View
+        android:id="@+id/scroll_bar"
+        android:layout_width="48dp"
+        android:layout_height="match_parent"
+        android:layout_gravity="end"
+        android:alpha="0.22352941176" />
+
+    <View
+        android:id="@+id/scroll_handle"
+        android:layout_width="48dp"
+        android:layout_height="48dp"
+        android:layout_gravity="end" />
+
+</FrameLayout>

app/src/main/res/values-v21/dimens.xml

@@ -2,4 +2,7 @@
 <resources>
     <dimen name="status_bar_padding">25dp</dimen>
     <dimen name="navigation_drawer_header_height">165dp</dimen>
+
+    <dimen name="fab_margin">16dp</dimen>
+    <dimen name="tmp_no_fab_margin">0dp</dimen>
 </resources>

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

@@ -50,4 +50,12 @@ http://developer.android.com/guide/topics/appwidgets/index.html#CreatingLayout
 
     <dimen name="notification_albumart_size">128dp</dimen>
     <dimen name="bottom_offset_fab_activity">86dp</dimen>
+
+    <dimen name="min_scrollhandle_height">48dp</dimen>
+    <dimen name="scrollbar_width">8dp</dimen>
+    <dimen name="scrollbar_inset">40dp</dimen>
+
+    <!-- ONLY 0dp WHILE THERE IS THE BUG IN DESIGN SUPPORT LIBRARY 22.2.0-->
+    <dimen name="fab_margin">0dp</dimen>
+    <dimen name="tmp_no_fab_margin">-16dp</dimen>
 </resources>

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

@@ -140,6 +140,10 @@
     <string name="update_image">Update Image</string>
     <string name="playlist_empty_text">This playlist is empty</string>
     <string name="no_playlists">No playlists</string>
+    <string name="no_albums">No albums</string>
+    <string name="no_songs">No songs</string>
+    <string name="no_artists">No artists</string>
+    <string name="nothing_here">Nothing here</string>
     <string name="playlist_name">Playlist name</string>
     <string name="song">Song</string>
     <string name="pref_only_lollipop">Only available on Lollipop.</string>