Is it possible to implement sending a network request using a handler?

In Android, Handler is used for processing messages and executing code in a specific thread, most often in the UI thread. By itself, Handler is not intended for sending network requests, as network operations should be performed in a background thread to avoid blocking the UI.

However, Handler can be used to organize interaction between threads: for example, launching a network request in a separate thread or via AsyncTask (deprecated approach) or Executor, and then using Handler to send the results back to the UI thread for interface updates.

Example:

Handler handler = new Handler(Looper.getMainLooper());

new Thread(() -> {
    // Perform network request in background thread
    String result = performNetworkRequest();

    // Send result to UI thread
    handler.post(() -> {
        // Update UI with result
        textView.setText(result);
    });
}).start();

Thus, Handler does not perform network requests directly, but helps safely transfer data between threads.