tryfix some stupid bugs

app/src/main/java/v/blade/player/PlayerMediaPlayer.java

@@ -243,12 +243,15 @@ public void playSong(final Song song)
         if(song == null) return;
         currentSong = song;
 
-        if(currentActivePlayer != null) currentActivePlayer.pause(null); //even if player if not playing, we pause (in case player was about to play)
-
         /* select appropriate mediaplayer and start playback */
-        if(song.getSources().getSourceByPriority(0) == null)
-        {currentState = PLAYER_STATE_PAUSED; listener.onStateChange();}
-        currentActivePlayer = song.getSources().getSourceByPriority(0).getSource().getPlayer();
+        //check if the song is available
+        if(song.getSources().getSourceByPriority(0) == null) {currentState = PLAYER_STATE_PAUSED; listener.onStateChange();}
+
+        //switch mediaplayers
+        //if the mediaplayer is the same, we need to use little tricks to prevent a brutal transition
+        SourcePlayer nextPlayer = song.getSources().getSourceByPriority(0).getSource().getPlayer();
+        if(currentActivePlayer != null && currentActivePlayer != nextPlayer) currentActivePlayer.pause(null); //even if player if not playing, we pause (in case player was about to play)
+        currentActivePlayer = nextPlayer;
 
         if(requestAudioFocus())
         {

app/src/main/java/v/blade/ui/MainActivity.java

@@ -455,16 +455,19 @@ public void onGlobalLayout()
         navigationView.setItemBackgroundResource(ThemesActivity.currentColorBackground);
         navigationView.setBackgroundColor(ContextCompat.getColor(this, ThemesActivity.currentColorBackground));
         navigationView.getHeaderView(0).setBackgroundColor(ContextCompat.getColor(this, ThemesActivity.currentColorPrimary));
+
+        PlayerConnection.init(connectionCallbacks, getApplicationContext());
+        LibraryService.configureLibrary(getApplicationContext());
+        checkPermission();
     }
 
+    /*
     @Override
     protected void onStart()
     {
         super.onStart();
-        PlayerConnection.init(connectionCallbacks, getApplicationContext());
-        LibraryService.configureLibrary(getApplicationContext());
-        checkPermission();
     }
+    */
 
     @Override
     protected void onDestroy()
@@ -826,16 +829,22 @@ private void setPlaylist(ArrayList<Song> songs, int currentPos)
             return;
         }
 
+        if(!PlayerConnection.isServiceStarted) PlayerConnection.start();
+
         if(musicPlayer == null) System.err.println("MusicPlayer is NULL ! Where is PlayerService??");
         else musicPlayer.setCurrentPlaylist(songs, currentPos);
     }
     private void playNext(ArrayList<Song> songs)
     {
+        if(!PlayerConnection.isServiceStarted) PlayerConnection.start();
+
         if(musicPlayer == null) System.err.println("MusicPlayer is NULL ! Where is PlayerService??");
         else musicPlayer.addNextToPlaylist(songs);
     }
     private void addToPlaylist(ArrayList<Song> songs)
     {
+        if(!PlayerConnection.isServiceStarted) PlayerConnection.start();
+
         if(musicPlayer == null) System.err.println("MusicPlayer is NULL ! Where is PlayerService??");
         else musicPlayer.addToPlaylist(songs);
     }

app/src/main/java/v/blade/ui/PlayerConnection.java

@@ -21,6 +21,7 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.ServiceConnection;
+import android.os.Build;
 import android.os.IBinder;
 import android.support.v4.media.session.MediaControllerCompat;
 import v.blade.library.Song;
@@ -38,6 +39,7 @@ public class PlayerConnection
     private static ArrayList<Song> playOnConnect; private static int positionOnConnect;
     private static volatile PlayerService musicPlayer = null;
     public static MediaControllerCompat musicController;
+    public static boolean isServiceStarted = false;
     private static ServiceConnection musicConnection = new ServiceConnection()
     {
         @Override
@@ -76,19 +78,14 @@ public static boolean init(Callback connectionCallback, Context applicationConte
         return applicationContext.bindService(serv, musicConnection, Context.BIND_AUTO_CREATE);
     }
 
-    /*
-    public static void start(ArrayList<Song> songs, int currentPos)
+    public static void start()
     {
-        playOnConnect = songs;
-        positionOnConnect = currentPos;
-
         Intent serv = new Intent(applicationContext, PlayerService.class);
-
         if(Build.VERSION.SDK_INT >= 26) applicationContext.startForegroundService(serv);
         else applicationContext.startService(serv);
 
-        applicationContext.bindService(serv, musicConnection, Context.BIND_ABOVE_CLIENT);
-    }*/
+        isServiceStarted = true;
+    }
 
     public static PlayerService getService()
     {