Problems making a connection as a thread

[SirDrake]

Hi

I'm finishing my app and i have a pair of new problems. As i've seen in tutorials and other apps i use a main class who implements the midlet interface and the other screens are soons of Form, Canvas, List,... being the main class the one who decide which one is the current screen. But i have 2 problems.

How can i show an alert form a not main class?
I want to download some images from a not main class, and the class who makes the conection must be a thread, so i've made a method in the main class how returns the byte[] with the data, this method runs the thread and show a Canvas class how inform to the user that the app is connecting and permit to the user cancel the connection but here the problem. I don't know how to return to the Form class the byte[] with the data.

Sorry for my bad english and i hope u could answer my question. If u don't understand something or have any problem i'll try to explain it better

Thanks

Adrián

[kisember]

To show an Alert or any other Displayable you need a reference to the display object, and optionaly a reference to the next Displayable object. You can pass them to the "non main class" by its constructor/set method/...

To return the images use a Vector of byte[] inside the Runnable class, and an indicator that check if the imageas downloaded.

class MyProgressCanvas extends Canvas implements Runnable {

  public boolean running = false;
  public Vector result = new Vector();
  private String[] imageURLs = {"...","...",...};
  private boolean interrupted = false;

  void run() {
    running = true;
    index = 0;
    while (index < imageURLs.length) && (!interrupted) {
      // create new byte[]
      // download image to the byte array
      // add array to the vector
      // update the progress bar or whatever and repaint
      index++;
    }
    running = false;
  }

  void paint (Graphics g) {
    // paint whatever you want
  }
  
  void keyPressed(int keyCode) {
    // set interrupted to false at certain keypress
  }
}

In the main class create this object, make it current and make a loop that wait until its running field became false, then use the Vector field for any purpose.