Question

I’ve understood that a network operation is not allowed on the GUI thread. Ok for me. But why using this code on a Dialog button click callback still produce NetworkOnMainThreadException ?

new Thread(new Runnable() {                         
  @Override
  public void run() {
    heavyAndTimeConsumingOperation();
  }
}).run();

perhaps i’m not spawning a new thread this way?

Answer 1

You need to call .start(), not .run().

.run() is the method you override that actually executes.
.start() is a system-provided method that actually starts a thread.