sprintpcs Player: Check if there's a valid playerListener to update

Some jars might very well play media without assigning a playerListener,
so account for that on all relevant methods to avoid any possible
NullPointerExceptions.

src/com/sprintpcs/media/Player.java

@@ -56,7 +56,7 @@ public static void play(Clip clip, int repeat)
         try 
         { 
             player.start();
-            listener.playerUpdate(PlayerListener.STARTED, player.getMediaTime());
+            if(listener != null) { listener.playerUpdate(PlayerListener.STARTED, player.getMediaTime()); }
         } 
         catch (Exception e) { Mobile.log(Mobile.LOG_WARNING, Player.class.getPackage().getName() + "." + Player.class.getSimpleName() + ": " + "failed to play Clip media: " + e.getMessage()); }
 	}
@@ -86,15 +86,19 @@ public static void play(DualTone dTone, int repeat) // I assume the second argum
         try 
         { 
             player.start();
-            listener.playerUpdate(PlayerListener.STARTED, player.getMediaTime());
+            if(listener != null) { listener.playerUpdate(PlayerListener.STARTED, player.getMediaTime()); }
         } 
         catch (Exception e) 
         { 
             Mobile.log(Mobile.LOG_WARNING, Player.class.getPackage().getName() + "." + Player.class.getSimpleName() + ": " + "failed to play DualTone media: " + e.getMessage());
         }
 	}
 
-    public static void resume() { player.start(); }
+    public static void resume() 
+    { 
+        player.start(); 
+        if(listener != null) { listener.playerUpdate(PlayerListener.STARTED, player.getMediaTime()); } 
+    }
 
     public static void addPlayerListener(PlayerListener playerListener) { listener = playerListener; }
 
@@ -105,7 +109,7 @@ public static void stop()
 		if (player != null) 
         { 
             player.stop(); 
-            listener.playerUpdate(PlayerListener.STOPPED, player.getMediaTime());
+            if(listener != null) { listener.playerUpdate(PlayerListener.STOPPED, player.getMediaTime()); }
         }
 	}
 }