Fixed volume resetting between songs.

src/main/java/musicplayer/Player.java

@@ -18,6 +18,7 @@ public class Player {
     private Thread thread;
     private Song currentSong;
     private PlayerCallbackInterface callbackInterface;
+    private int currentVolume = 100;
 
     /**
      * Manages GStreamer based playback operations.
@@ -40,6 +41,7 @@ public class Player {
             });
             callbackThing.start();
         });
+        currentVolume = getVolume();
     }
 
     /**
@@ -62,6 +64,7 @@ public class Player {
             playBin.setURI(songFile.toURI());
             internalThread = new InternalThread();
             thread = new Thread(internalThread);
+            setVolume(currentVolume);
             playBin.play();
             thread.start();
             while (true) {
@@ -115,6 +118,7 @@ public class Player {
      * @param volume New volume in percent.
      */
     public void setVolume(int volume){
+        currentVolume = volume;
         playBin.setVolumePercent(volume);
     }