Toast isn't working in listener

Question

I want to open a Toast, but it doesn"t seem to work in a listener (of Smack), like this example:

private ChatManagerListener chatManagerListener = new ChatManagerListener() {

    public void chatCreated(Chat newChat, boolean createdLocally) {
        if(!createdLocally) {

            Toast.makeText(mCtx, "CHAT CREATED", Toast.LENGTH_SHORT).show();

            // do some stuff

        }
    }
}; 

If I use the Toast-code somewhere else in the class, it works, as long as it isn't a listener.

Answer 1

runOnUiThread(new Runnable() {  
   @Override  
   public void run() {  
      Toast.makeText(Activity.this, "import finished", Toast.LENGTH_SHORT).show();  
   }  
});