AntennaPod · ByteHamster · Mar 1, 2021 · Feb 1, 2021 · Feb 1, 2021 · Feb 3, 2021
diff --git a/app/src/main/java/de/danoeh/antennapod/fragment/AudioPlayerFragment.java b/app/src/main/java/de/danoeh/antennapod/fragment/AudioPlayerFragment.java
@@ -31,6 +31,7 @@
 import de.danoeh.antennapod.activity.MainActivity;
 import de.danoeh.antennapod.core.event.FavoritesEvent;
 import de.danoeh.antennapod.core.event.PlaybackPositionEvent;
+import de.danoeh.antennapod.core.feed.Chapter;
 import de.danoeh.antennapod.core.feed.FeedItem;
 import de.danoeh.antennapod.core.feed.FeedMedia;
 import de.danoeh.antennapod.core.feed.util.PlaybackSpeedUtils;
@@ -47,6 +48,7 @@
 import de.danoeh.antennapod.dialog.SleepTimerDialog;
 import de.danoeh.antennapod.dialog.VariableSpeedDialog;
 import de.danoeh.antennapod.menuhandler.FeedItemMenuHandler;
+import de.danoeh.antennapod.view.ChapterSeekBar;
 import de.danoeh.antennapod.view.PlaybackSpeedIndicatorView;
 import io.reactivex.Maybe;
 import io.reactivex.android.schedulers.AndroidSchedulers;
@@ -64,7 +66,7 @@
  * Shows the audio player.
  */
 public class AudioPlayerFragment extends Fragment implements
-        SeekBar.OnSeekBarChangeListener, Toolbar.OnMenuItemClickListener {
+        ChapterSeekBar.OnSeekBarChangeListener, Toolbar.OnMenuItemClickListener {
     public static final String TAG = "AudioPlayerFragment";
     private static final int POS_COVER = 0;
     private static final int POS_DESCR = 1;
@@ -79,7 +81,7 @@ public class AudioPlayerFragment extends Fragment implements
     private ViewPager2 pager;
     private TextView txtvPosition;
     private TextView txtvLength;
-    private SeekBar sbPosition;
+    private ChapterSeekBar sbPosition;
     private ImageButton butRev;
     private TextView txtvRev;
     private ImageButton butPlay;
@@ -178,6 +180,31 @@ public void setHasChapters(boolean hasChapters) {
         this.hasChapters = hasChapters;
         tabLayoutMediator.detach();
         tabLayoutMediator.attach();
+        if (controller != null) {
+            setChapterDividers(controller.getMedia());
+        }
+    }
+
+    public void setChapterDividers(Playable media) {
+
+        if (media == null) {
+            return;
+        }
+
+        List<Chapter> chapters;
+        float[] dividerPos = null;
+
+        if ((chapters = media.getChapters()) != null && chapters.size() > 0) {
+            dividerPos = new float[chapters.size() - 1];
+            float duration = media.getDuration();
+
+            for (int i = 1; i < chapters.size(); i++) {
+                dividerPos[i - 1] = chapters.get(i).getStart() / duration;
+            }
+        }
+
+        sbPosition.setDividerPos(dividerPos);
+        sbPosition.invalidate();
     }
 
     public View getExternalPlayerHolder() {

diff --git a/app/src/main/java/de/danoeh/antennapod/view/ChapterSeekBar.java b/app/src/main/java/de/danoeh/antennapod/view/ChapterSeekBar.java
@@ -0,0 +1,85 @@
+package de.danoeh.antennapod.view;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.util.AttributeSet;
+
+import de.danoeh.antennapod.core.util.ThemeUtils;
+
+public class ChapterSeekBar extends androidx.appcompat.widget.AppCompatSeekBar {
+
+    private float[] dividerPos;
+    private final Paint dividerPaint = new Paint();
+
+    public ChapterSeekBar(Context context) {
+        super(context);
+        init();
+    }
+
+    public ChapterSeekBar(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    public ChapterSeekBar(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init();
+    }
+
+    private void init() {
+        setBackground(null); // Removes the thumb shadow
+        dividerPos = null;
+        dividerPaint.setColor(ThemeUtils.getColorFromAttr(getContext(), android.R.attr.windowBackground));
+    }
+
+    /**
+     * Calculates the positions of the chapter dividers in the progress bar.
+     * @param dividerPos of the chapter dividers relative to the duration of the media.
+     */
+    public void setDividerPos(final float[] dividerPos) {
+        if (dividerPos != null && dividerPos.length > 0) {
+            float width = (float) (getRight() - getPaddingRight() - getLeft() - getPaddingLeft());
+            this.dividerPos = new float[dividerPos.length];
+
+            for (int i = 0; i < dividerPos.length; i++) {
+                this.dividerPos[i] = dividerPos[i] * width;
+            }
+
+        } else {
+            this.dividerPos = null;
+        }
+    }
+
+    @Override
+    protected synchronized void onDraw(Canvas canvas) {
+        drawProgress(canvas);
+        if (dividerPos != null) {
+            drawDividers(canvas);
+        }
+        drawThumb(canvas);
+    }
+
+    private void drawProgress(Canvas canvas) {
+        final int saveCount = canvas.save();
+        canvas.translate(getPaddingLeft(), getPaddingTop());
+        getProgressDrawable().draw(canvas);
+        canvas.restoreToCount(saveCount);
+    }
+
+    private void drawDividers(Canvas canvas) {
+        final int saveCount = canvas.save();
+        canvas.translate(getPaddingLeft(), getPaddingTop());
+        for (float pos : dividerPos) {
+            canvas.drawRect(pos - 5, getTop(), pos + 5, getBottom(), dividerPaint);
+        }
+        canvas.restoreToCount(saveCount);
+    }
+
+    private void drawThumb(Canvas canvas) {
+        final int saveCount = canvas.save();
+        canvas.translate(getPaddingLeft() - getThumbOffset(), getPaddingTop());
+        getThumb().draw(canvas);
+        canvas.restoreToCount(saveCount);
+    }
+}
diff --git a/app/src/main/res/layout/audioplayer_fragment.xml b/app/src/main/res/layout/audioplayer_fragment.xml
@@ -88,7 +88,7 @@
             android:layoutDirection="ltr"
             android:orientation="vertical">
 
-        <SeekBar
+        <de.danoeh.antennapod.view.ChapterSeekBar
                 android:id="@+id/sbPosition"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"

diff --git a/core/src/main/res/values/attrs.xml b/core/src/main/res/values/attrs.xml
@@ -72,4 +72,7 @@
             <enum name="minimum" value="2"/>
         </attr>
     </declare-styleable>
+
+    <declare-styleable name="ChapterSeekBar" />
+
 </resources>