MusicPlayer app: fix crash if song finished while app closed

internal_filesystem/apps/com.micropythonos.musicplayer/assets/music_player.py

@@ -63,7 +63,6 @@ class FullscreenPlayer(Activity):
     
     # Internal state:
     _filename = None
-    _keep_running = True
 
     def onCreate(self):
         self._filename = self.getIntent().extras.get("filename")
@@ -101,7 +100,7 @@ class FullscreenPlayer(Activity):
         self.setContentView(qr_screen)
 
     def onResume(self, screen):
-        self._keep_running = True
+        super().onResume(screen)
         if not self._filename:
             print("Not playing any file...")
         else:
@@ -119,15 +118,12 @@ class FullscreenPlayer(Activity):
         obj.set_style_border_width(0, lv.PART.MAIN)
 
     def stop_button_clicked(self, event):
-        self._keep_running = False
         AudioPlayer.stop_playing()
         self.finish()
 
     def player_finished(self, result=None):
-        if not self._keep_running:
-            return # stop immediately
         text = f"Finished playing {self._filename}"
         if result:
             text = result
         print(f"AudioPlayer finished: {text}")
-        lv.async_call(lambda l: self._filename_label.set_text(text), None)
+        update_ui_threadsafe_if_foreground(self._filename_label.set_text, text)