Added a lyrics dialog. Updated the SlidingUpPanelLayout lib which fixes a few sliding issues. Fixed an issue where the sling panel would get stuck somewhere in the middle. Fixed a NPE in an asynctask onPostExecute().

app/build.gradle

@@ -134,7 +134,7 @@ dependencies {
     compile 'com.android.support:preference-v7:23.2.1'
     compile 'com.github.ksoichiro:android-observablescrollview:1.6.0'
     compile 'com.github.kabouzeid:SeekArc:1.2-kmod'
-    compile 'com.github.kabouzeid:AndroidSlidingUpPanel:3.3.1-kmod'
+    compile 'com.github.kabouzeid:AndroidSlidingUpPanel:3.3.0-kmod2'
     compile 'com.squareup.retrofit2:retrofit:2.0.0'
     compile 'com.squareup.retrofit2:converter-gson:2.0.0'
     compile 'com.jakewharton:butterknife:7.0.1'

app/src/main/java/com/kabouzeid/gramophone/dialogs/LyricsDialog.java

@@ -0,0 +1,76 @@
+package com.kabouzeid.gramophone.dialogs;
+
+import android.app.Dialog;
+import android.os.Bundle;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.support.annotation.NonNull;
+import android.support.v4.app.DialogFragment;
+
+import com.afollestad.materialdialogs.MaterialDialog;
+
+import hugo.weaving.DebugLog;
+
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
+public class LyricsDialog extends DialogFragment {
+
+    public static LyricsDialog create(@NonNull LyricInfo lyricInfo) {
+        LyricsDialog dialog = new LyricsDialog();
+        Bundle args = new Bundle();
+        args.putParcelable("LyricInfo", lyricInfo);
+        dialog.setArguments(args);
+        return dialog;
+    }
+
+    @DebugLog
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        LyricInfo lyricInfo = getArguments().getParcelable("LyricInfo");
+        //noinspection ConstantConditions
+        return new MaterialDialog.Builder(getActivity())
+                .title(lyricInfo.title)
+                .content(lyricInfo.lyrics)
+                .build();
+    }
+
+    public static class LyricInfo implements Parcelable {
+        public final String title;
+        public final String lyrics;
+
+        public LyricInfo(String title, String lyrics) {
+            this.title = title;
+            this.lyrics = lyrics;
+        }
+
+        @Override
+        public int describeContents() {
+            return 0;
+        }
+
+        @Override
+        public void writeToParcel(Parcel dest, int flags) {
+            dest.writeString(this.title);
+            dest.writeString(this.lyrics);
+        }
+
+        protected LyricInfo(Parcel in) {
+            this.title = in.readString();
+            this.lyrics = in.readString();
+        }
+
+        public static final Parcelable.Creator<LyricInfo> CREATOR = new Parcelable.Creator<LyricInfo>() {
+            @Override
+            public LyricInfo createFromParcel(Parcel source) {
+                return new LyricInfo(source);
+            }
+
+            @Override
+            public LyricInfo[] newArray(int size) {
+                return new LyricInfo[size];
+            }
+        };
+    }
+}

app/src/main/java/com/kabouzeid/gramophone/ui/activities/base/AbsSlidingMusicPanelActivity.java

@@ -107,6 +107,9 @@ public abstract class AbsSlidingMusicPanelActivity extends AbsMusicServiceActivi
             case EXPANDED:
                 onPanelExpanded(panel);
                 break;
+            case ANCHORED:
+                collapsePanel(); // this fixes a bug where the panel would get stuck for some reason
+                break;
         }
     }
 

app/src/main/java/com/kabouzeid/gramophone/ui/fragments/player/PlayerFragment.java

@@ -2,6 +2,7 @@ package com.kabouzeid.gramophone.ui.fragments.player;
 
 import android.animation.Animator;
 import android.animation.AnimatorSet;
+import android.app.Activity;
 import android.graphics.Color;
 import android.graphics.PorterDuff;
 import android.graphics.drawable.Drawable;
@@ -15,7 +16,9 @@ import android.support.v7.widget.CardView;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.Toolbar;
+import android.text.TextUtils;
 import android.view.LayoutInflater;
+import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewAnimationUtils;
@@ -36,6 +39,7 @@ import com.kabouzeid.appthemehelper.util.ToolbarContentTintHelper;
 import com.kabouzeid.gramophone.R;
 import com.kabouzeid.gramophone.adapter.base.MediaEntryViewHolder;
 import com.kabouzeid.gramophone.adapter.song.PlayingQueueAdapter;
+import com.kabouzeid.gramophone.dialogs.LyricsDialog;
 import com.kabouzeid.gramophone.dialogs.SongShareDialog;
 import com.kabouzeid.gramophone.helper.MusicPlayerRemote;
 import com.kabouzeid.gramophone.helper.menu.SongMenuHelper;
@@ -47,6 +51,16 @@ import com.kabouzeid.gramophone.util.ViewUtil;
 import com.kabouzeid.gramophone.views.WidthFitSquareLayout;
 import com.sothree.slidinguppanel.SlidingUpPanelLayout;
 
+import org.jaudiotagger.audio.AudioFileIO;
+import org.jaudiotagger.audio.exceptions.CannotReadException;
+import org.jaudiotagger.audio.exceptions.InvalidAudioFrameException;
+import org.jaudiotagger.audio.exceptions.ReadOnlyFileException;
+import org.jaudiotagger.tag.FieldKey;
+import org.jaudiotagger.tag.TagException;
+
+import java.io.File;
+import java.io.IOException;
+
 import butterknife.Bind;
 import butterknife.ButterKnife;
 
@@ -79,6 +93,9 @@ public class PlayerFragment extends AbsPlayerFragment implements PlayerAlbumCove
     private RecyclerViewDragDropManager recyclerViewDragDropManager;
 
     private AsyncTask updateIsFavoriteTask;
+    private AsyncTask updateLyricsAsyncTask;
+
+    private LyricsDialog.LyricInfo lyricsInfo;
 
     private Impl impl;
 
@@ -160,6 +177,7 @@ public class PlayerFragment extends AbsPlayerFragment implements PlayerAlbumCove
         updateQueue();
         updateCurrentSong();
         updateIsFavorite();
+        updateLyrics();
     }
 
     @Override
@@ -167,6 +185,7 @@ public class PlayerFragment extends AbsPlayerFragment implements PlayerAlbumCove
         updateCurrentSong();
         updateIsFavorite();
         updateQueuePosition();
+        updateLyrics();
     }
 
     @Override
@@ -217,6 +236,17 @@ public class PlayerFragment extends AbsPlayerFragment implements PlayerAlbumCove
         toolbar.setOnMenuItemClickListener(this);
     }
 
+    @Override
+    public boolean onMenuItemClick(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.action_show_lyrics:
+                if (lyricsInfo != null)
+                    LyricsDialog.create(lyricsInfo).show(getFragmentManager(), "LYRICS");
+                return true;
+        }
+        return super.onMenuItemClick(item);
+    }
+
     private void setUpRecyclerView() {
         recyclerViewDragDropManager = new RecyclerViewDragDropManager();
         final GeneralItemAnimator animator = new RefactoredDefaultItemAnimator();
@@ -252,16 +282,65 @@ public class PlayerFragment extends AbsPlayerFragment implements PlayerAlbumCove
 
             @Override
             protected void onPostExecute(Boolean isFavorite) {
-                int res = isFavorite ? R.drawable.ic_favorite_white_24dp : R.drawable.ic_favorite_border_white_24dp;
+                Activity activity = getActivity();
-                int color = ToolbarContentTintHelper.toolbarContentColor(getActivity(), Color.TRANSPARENT);
+                if (activity != null) {
-                Drawable drawable = TintHelper.createTintedDrawable(ContextCompat.getDrawable(getActivity(), res), color);
+                    int res = isFavorite ? R.drawable.ic_favorite_white_24dp : R.drawable.ic_favorite_border_white_24dp;
-                toolbar.getMenu().findItem(R.id.action_toggle_favorite)
+                    int color = ToolbarContentTintHelper.toolbarContentColor(activity, Color.TRANSPARENT);
-                        .setIcon(drawable)
+                    Drawable drawable = TintHelper.createTintedDrawable(ContextCompat.getDrawable(activity, res), color);
-                        .setTitle(isFavorite ? getString(R.string.action_remove_from_favorites) : getString(R.string.action_add_to_favorites));
+                    toolbar.getMenu().findItem(R.id.action_toggle_favorite)
+                            .setIcon(drawable)
+                            .setTitle(isFavorite ? getString(R.string.action_remove_from_favorites) : getString(R.string.action_add_to_favorites));
+                }
             }
         }.execute(MusicPlayerRemote.getCurrentSong());
     }
 
+    private void updateLyrics() {
+        if (updateLyricsAsyncTask != null) updateLyricsAsyncTask.cancel(false);
+        final Song song = MusicPlayerRemote.getCurrentSong();
+        updateLyricsAsyncTask = new AsyncTask<Void, Void, String>() {
+            @Override
+            protected void onPreExecute() {
+                super.onPreExecute();
+                lyricsInfo = null;
+                toolbar.getMenu().removeItem(R.id.action_show_lyrics);
+            }
+
+            @Override
+            protected String doInBackground(Void... params) {
+                try {
+                    return AudioFileIO.read(new File(song.data)).getTagOrCreateDefault().getFirst(FieldKey.LYRICS);
+                } catch (IOException | CannotReadException | TagException | InvalidAudioFrameException | ReadOnlyFileException e) {
+                    e.printStackTrace();
+                }
+                return null;
+            }
+
+            @Override
+            protected void onPostExecute(String lyrics) {
+                super.onPostExecute(lyrics);
+                if (TextUtils.isEmpty(lyrics)) {
+                    lyricsInfo = null;
+                    if (toolbar != null) {
+                        toolbar.getMenu().removeItem(R.id.action_show_lyrics);
+                    }
+                } else {
+                    lyricsInfo = new LyricsDialog.LyricInfo(song.title, lyrics);
+                    Activity activity = getActivity();
+                    if (toolbar != null && activity != null)
+                        if (toolbar.getMenu().findItem(R.id.action_show_lyrics) == null) {
+                            int color = ToolbarContentTintHelper.toolbarContentColor(activity, Color.TRANSPARENT);
+                            Drawable drawable = TintHelper.createTintedDrawable(ContextCompat.getDrawable(activity, R.drawable.ic_comment_text_outline_white_24dp), color);
+                            toolbar.getMenu()
+                                    .add(Menu.NONE, R.id.action_show_lyrics, Menu.NONE, R.string.action_show_lyrics)
+                                    .setIcon(drawable)
+                                    .setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
+                        }
+                }
+            }
+        }.execute();
+    }
+
     @Override
     @ColorInt
     public int getPaletteColor() {
@@ -333,6 +412,9 @@ public class PlayerFragment extends AbsPlayerFragment implements PlayerAlbumCove
             case COLLAPSED:
                 onPanelCollapsed(panel);
                 break;
+            case ANCHORED:
+                slidingUpPanelLayout.setPanelState(SlidingUpPanelLayout.PanelState.COLLAPSED); // this fixes a bug where the panel would get stuck for some reason
+                break;
         }
     }
 
@@ -448,7 +530,7 @@ public class PlayerFragment extends AbsPlayerFragment implements PlayerAlbumCove
             int topMargin = fragment.getResources().getDimensionPixelSize(R.dimen.status_bar_padding);
 
             final int availablePanelHeight = fragment.slidingUpPanelLayout.getHeight() - fragment.getView().findViewById(R.id.player_content).getHeight() + topMargin;
-            final int minPanelHeight = (int) fragment.getResources().getDisplayMetrics().density * (72 + 24) + topMargin;
+            final int minPanelHeight = (int) ViewUtil.convertDpToPixel(72 + 24, fragment.getResources()) + topMargin;
             if (availablePanelHeight < minPanelHeight) {
                 albumCoverContainer.getLayoutParams().height = albumCoverContainer.getHeight() - (minPanelHeight - availablePanelHeight);
                 albumCoverContainer.forceSquare(false);

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

@@ -5,6 +5,7 @@ import android.animation.ArgbEvaluator;
 import android.animation.ObjectAnimator;
 import android.content.Context;
 import android.content.res.ColorStateList;
+import android.content.res.Resources;
 import android.graphics.Color;
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
@@ -13,6 +14,7 @@ import android.graphics.drawable.StateListDrawable;
 import android.os.Build;
 import android.support.annotation.ColorInt;
 import android.support.v4.view.ViewCompat;
+import android.util.DisplayMetrics;
 import android.view.View;
 import android.view.animation.PathInterpolator;
 import android.widget.TextView;
@@ -84,4 +86,14 @@ public class ViewUtil {
         recyclerView.setThumbColor(accentColor);
         recyclerView.setTrackColor(ColorUtil.withAlpha(ATHUtil.resolveColor(context, R.attr.colorControlNormal), 0.12f));
     }
+
+    public static float convertDpToPixel(float dp, Resources resources) {
+        DisplayMetrics metrics = resources.getDisplayMetrics();
+        return dp * metrics.density;
+    }
+
+    public static float convertPixelsToDp(float px, Resources resources) {
+        DisplayMetrics metrics = resources.getDisplayMetrics();
+        return px / metrics.density;
+    }
 }

app/src/main/res/drawable/ic_comment_text_outline_white_24dp.xml

@@ -0,0 +1,10 @@
+<!-- drawable/comment_text_outline.xml -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:height="24dp"
+    android:width="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M9,22A1,1 0 0,1 8,21V18H4A2,2 0 0,1 2,16V4C2,2.89 2.9,2 4,2H20A2,2 0 0,1 22,4V16A2,2 0 0,1 20,18H13.9L10.2,21.71C10,21.9 9.75,22 9.5,22V22H9M10,16V19.08L13.08,16H20V4H4V16H10M6,7H18V9H6V7M6,11H15V13H6V11Z" />
+</vector>

app/src/main/res/menu/menu_player.xml

@@ -4,21 +4,25 @@
     <item
         android:id="@+id/action_toggle_favorite"
         android:icon="@drawable/ic_favorite_border_white_24dp"
+        android:orderInCategory="1"
         android:title="@string/action_add_to_favorites"
         app:showAsAction="ifRoom" />
 
     <item
         android:id="@+id/action_shuffle_all"
+        android:orderInCategory="1"
         android:title="@string/action_shuffle_all"
         app:showAsAction="never" />
 
     <item
         android:id="@+id/action_clear_playing_queue"
+        android:orderInCategory="1"
         android:title="@string/action_clear_playing_queue"
         app:showAsAction="never" />
 
     <item
         android:id="@+id/action_sleep_timer"
+        android:orderInCategory="1"
         android:title="@string/action_sleep_timer"
         app:showAsAction="never" />
 

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

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <item name="action_new_playlist" type="id" />
+    <item name="action_show_lyrics" type="id" />
 </resources>

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

@@ -99,6 +99,7 @@
     <string name="action_shuffle_playlist">Shuffle playlist</string>
     <string name="action_clear_playing_queue">Clear playing queue</string>
     <string name="action_go_to_start_directory">Go to start directory</string>
+    <string name="action_show_lyrics">Show lyrics</string>
     <string name="last_opened">Last opened</string>
     <string name="light_theme_name">Light</string>
     <string name="dark_theme_name">Dark</string>