added white play button icon for notification controls; pause button soon to follow.

Some checks for audioStreams being null added, along with minor semnatic restructuring of parseDashManifest()

app/src/main/java/org/schabi/newpipe/ActionBarHandler.java

@@ -120,6 +120,9 @@ class ActionBarHandler {
                 }
             }
         }
+        else {
+            Log.e(TAG, "FAILED to set audioStream value!");
+        }
     }
 
     private void selectFormatItem(int i) {
@@ -301,6 +304,8 @@ class ActionBarHandler {
             intent = new Intent(activity, BackgroundPlayer.class);
 
             intent.setAction(Intent.ACTION_VIEW);
+            Log.i(TAG, "audioStream is null:" + (audioStream == null));
+            Log.i(TAG, "audioStream.url is null:"+(audioStream.url==null));
             intent.setDataAndType(Uri.parse(audioStream.url),
                     MediaFormat.getMimeById(audioStream.format));
             intent.putExtra(Intent.EXTRA_TITLE, videoTitle);

app/src/main/java/org/schabi/newpipe/BackgroundPlayer.java

@@ -45,8 +45,6 @@ public class BackgroundPlayer extends Service /*implements MediaPlayer.OnPrepare
     private static final String TAG = BackgroundPlayer.class.toString();
     private static final String ACTION_STOP = TAG+".STOP";
     private static final String ACTION_PLAYPAUSE = TAG+".PLAYPAUSE";
-    //private Looper mServiceLooper;
-    //private ServiceHandler mServiceHandler;
 
     public BackgroundPlayer() {
         super();
@@ -138,29 +136,23 @@ public class BackgroundPlayer extends Service /*implements MediaPlayer.OnPrepare
             wifiLock.acquire();
             mediaPlayer.start();
 
-            //mediaPlayer.getCurrentPosition()
-            int vidLength = mediaPlayer.getDuration();
-
-            //Intent genericIntent = new Intent(owner, owner.getClass());
-
-            //PendingIntent playPI = PendingIntent.getService(owner, noteID, genericIntent, 0);
-            PendingIntent playPI = PendingIntent.getBroadcast(owner, noteID, new Intent(ACTION_PLAYPAUSE), PendingIntent.FLAG_UPDATE_CURRENT);
-
-            NotificationCompat.Action.Builder buttonBuilder =
-                    new NotificationCompat.Action.Builder(R.drawable.ic_play_arrow_black,
-                                                    "Play", playPI);//todo:translatable string
-            NotificationCompat.Action playButton = buttonBuilder.build();
-
-            PendingIntent stopPI = PendingIntent.getBroadcast(owner, noteID,
-                    new Intent(ACTION_STOP), PendingIntent.FLAG_UPDATE_CURRENT);
-
             IntentFilter filter = new IntentFilter();
             filter.setPriority(Integer.MAX_VALUE);
             filter.addAction(ACTION_PLAYPAUSE);
             filter.addAction(ACTION_STOP);
             registerReceiver(broadcastReceiver, filter);
 
-            //playPauseButton
+            PendingIntent playPI = PendingIntent.getBroadcast(owner, noteID, new Intent(ACTION_PLAYPAUSE), PendingIntent.FLAG_UPDATE_CURRENT);
+
+            NotificationCompat.Action playButton = new NotificationCompat.Action.Builder
+                    (R.drawable.ic_play_arrow_white_48dp, "Play", playPI).build();
+
+            NotificationCompat.Action pauseButton = new NotificationCompat.Action.Builder
+                    (R.drawable.ic_play_arrow_white_48dp, "Pause", playPI).build();
+
+            PendingIntent stopPI = PendingIntent.getBroadcast(owner, noteID,
+                    new Intent(ACTION_STOP), PendingIntent.FLAG_UPDATE_CURRENT);
+
             //todo: make it so that tapping the notification brings you back to the Video's DetailActivity
             //using setContentIntent
             noteBuilder = new NotificationCompat.Builder(owner);
@@ -232,7 +224,7 @@ public class BackgroundPlayer extends Service /*implements MediaPlayer.OnPrepare
             //noteBuilder.setProgress(0, 0, false);//remove progress bar
             noteMgr.cancel(noteID);//remove notification
             unregisterReceiver(broadcastReceiver);
-            mediaPlayer.release();//release system resources
+            mediaPlayer.release();//release mediaPlayer's system resources
 
 
             wifiLock.release();//release wifilock

app/src/main/java/org/schabi/newpipe/services/youtube/YoutubeVideoExtractor.java

@@ -371,6 +371,16 @@ public class YoutubeVideoExtractor extends VideoExtractor {
         //todo: replace this with a call to getVideoId, if possible
         videoInfo.id = matchGroup1("v=([0-9a-zA-Z_-]{11})", pageUrl);
 
+        if(videoInfo.audioStreams == null
+                || videoInfo.audioStreams.length == 0) {
+            Log.e(TAG, "uninitialised audio streams!");
+        }
+
+        if(videoInfo.videoStreams == null
+                || videoInfo.videoStreams.length == 0) {
+            Log.e(TAG, "uninitialised video streams!");
+        }
+
         videoInfo.age_limit = 0;
 
         //average rating
@@ -445,13 +455,14 @@ public class YoutubeVideoExtractor extends VideoExtractor {
         try {
             XmlPullParser parser = Xml.newPullParser();
             parser.setInput(new StringReader(dashDoc));
-            int eventType = parser.getEventType();
             String tagName = "";
             String currentMimeType = "";
             int currentBandwidth = -1;
             int currentSamplingRate = -1;
             boolean currentTagIsBaseUrl = false;
-            while(eventType != XmlPullParser.END_DOCUMENT) {
+            for(int eventType = parser.getEventType();
+                eventType != XmlPullParser.END_DOCUMENT;
+                eventType = parser.next() ) {
                 switch(eventType) {
                     case XmlPullParser.START_TAG:
                         tagName = parser.getName();
@@ -465,8 +476,8 @@ public class YoutubeVideoExtractor extends VideoExtractor {
                         } else if(tagName.equals("BaseURL")) {
                             currentTagIsBaseUrl = true;
                         }
-
                         break;
+
                     case XmlPullParser.TEXT:
                         if(currentTagIsBaseUrl &&
                                 (currentMimeType.contains("audio"))) {
@@ -479,16 +490,14 @@ public class YoutubeVideoExtractor extends VideoExtractor {
                             audioStreams.add(new VideoInfo.AudioStream(parser.getText(),
                                     format, currentBandwidth, currentSamplingRate));
                         }
+                        //missing break here?
                     case XmlPullParser.END_TAG:
                         if(tagName.equals("AdaptationSet")) {
                             currentMimeType = "";
                         } else if(tagName.equals("BaseURL")) {
                             currentTagIsBaseUrl = false;
+                        }//no break needed here
                 }
-                        break;
-                    default:
-                }
-                eventType = parser.next();
             }
         } catch(Exception e) {
             e.printStackTrace();
@@ -583,10 +592,7 @@ public class YoutubeVideoExtractor extends VideoExtractor {
             e.printStackTrace();
         }
         Context.exit();
-        if(result != null)
+        return (result == null ? "" : result.toString());
-            return result.toString();
-        else
-            return "";
     }
 
     private String cleanUrl(String complexUrl) {