Code quality fix - Utility classes should not have public constructors.

library/src/main/java/com/thefinestartist/ytpa/utils/AudioUtil.java

@@ -8,6 +8,8 @@
  */
 public class AudioUtil {
 
+    private AudioUtil() {}
+
     private static final Object mSingletonLock = new Object();
     private static AudioManager audioManager;
 

library/src/main/java/com/thefinestartist/ytpa/utils/StatusBarUtil.java

@@ -10,6 +10,8 @@
  */
 public class StatusBarUtil {
 
+    private StatusBarUtil() {}
+
     public static void hide(Activity activity) {
         if (Build.VERSION.SDK_INT < 16) {
             activity.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

library/src/main/java/com/thefinestartist/ytpa/utils/YouTubeApp.java

@@ -14,6 +14,8 @@
  */
 public class YouTubeApp {
 
+    private YouTubeApp() {}
+
     public static void startVideo(@NonNull Context context, @NonNull String videoId) {
         Uri video_uri = Uri.parse(YouTubeUrlParser.getVideoUrl(videoId));
         Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube:" + videoId));

library/src/main/java/com/thefinestartist/ytpa/utils/YouTubeThumbnail.java

@@ -8,8 +8,12 @@
  * Created by TheFinestArtist on 6/27/15.
  */
 public class YouTubeThumbnail {
+
     public static final String IMG_YOUTUBE_COM_VI = "http://img.youtube.com/vi/";
-    //    Each YouTube video has 4 generated images. They are predictably formatted as follows:
+
+    private YouTubeThumbnail() {}
+
+//    Each YouTube video has 4 generated images. They are predictably formatted as follows:
 //
 //    http://img.youtube.com/vi/<insert-youtube-video-id-here>/0.jpg
 //    http://img.youtube.com/vi/<insert-youtube-video-id-here>/1.jpg

library/src/main/java/com/thefinestartist/ytpa/utils/YouTubeUrlParser.java

@@ -10,6 +10,8 @@
  */
 public class YouTubeUrlParser {
 
+    private YouTubeUrlParser() {}
+
     // (?:youtube(?:-nocookie)?\.com\/(?:[^\/\n\s]+\/\S+\/|(?:v|e(?:mbed)?)\/|\S*?[?&]v=)|youtu\.be\/)([a-zA-Z0-9_-]{11})
     final static String reg = "(?:youtube(?:-nocookie)?\\.com\\/(?:[^\\/\\n\\s]+\\/\\S+\\/|(?:v|e(?:mbed)?)\\/|\\S*?[?&]v=)|youtu\\.be\\/)([a-zA-Z0-9_-]{11})";
 

sample/src/main/java/com/thefinestartist/ytpa/sample/AdHelper.java

@@ -16,6 +16,8 @@ public class AdHelper {
     private static InterstitialAd interstitial = null;
     private static final Object lock = new Object();
 
+    private AdHelper() {}
+
     public static void loadBannerAd(AdView adView) {
         try {
             adView.loadAd(new AdRequest.Builder()