how to run android on the background code example

Example 1: how to run a background thread in android

Thread thread = new Thread() {
  @Override
  public void run() {
      try { Thread.sleep(2000); }
      catch (InterruptedException e) {}

      runOnUiThread(new Runnable() {
          @Override
          public void run() {
              textView.setText("OK");
          }
      });
  }
};
thread.start();

Example 2: how to set background image on button in android

btn.setBackgroundResource(R.drawable.new_todo_image);