while thinking about it, I noticed that this folder stuff is in another thread than my main program.

Under certain circumstances I have the issue that draw() uses vars not set correctly by the func folderSelected yet.

What is the proper way to handle this?

The parallel thread ends with the end of func folderSelected.

Do I have to set a boolean var threadIsDone to true at the end of func folderSelected and only then let draw() take the new folder into use?

Thanks!

while thinking about it, I noticed that this folder stuff is in another thread than my main program.

This was a major change from 1.5.1 which executed these dialogs in the main thread.

Do I have to set a boolean var threadIsDone to true at the end of func folderSelected.and only then let draw() take the new folder into use?

That would be the way to do it, the boolean acting as a flag when something has been loaded/processed.

ok, thanks a lot!

I will have a look at my fancy MP3-Player and do some house cleaning with this information.... 

in case somebody looks at the initial question with the default folder

1. //
2. void chooseFolder() {
3.   File folderToStartFrom = new File( "D://Musik//*.*" );
4.   selectFolder("Select a Music Folder to play", "folderSelected", folderToStartFrom );
5. }
6. //
7. void folderSelected(File selection) {
8.   // this runs in another thread parallel to the main thread
9.   if (selection == null) {
10.     println("Window was closed or the user hit cancel.");
11.   }
12.   else {
13.     noSongFound = true;
14.     println("User selected " + selection.getAbsolutePath());
15.     indexFile=0;
16.     pathGlobal= selection.getAbsolutePath();
17.     getFolder();
18.     getCurrentSong();
19.   }
20. }
21. //