Question

I have an error “Cannot make a static reference to the non-static method sendEmptyMessage(int) from the type Handler”

How to fix it? As I think this is a problem that this class where I do this is not an activity?

        new Thread() {
            public void run() {
            try {

                    List<Sail> sails = searchSails();

                    selectSailIntent.putParcelableArrayListExtra(
                            Constant.SAILS, new ArrayList<Sail>(sails));

                    getContext().startActivity(selectSailIntent);

                    Handler.sendEmptyMessage(0);

                } catch (Exception e) {
                     alertDialog.setMessage(e.getMessage());
                     Handler.sendEmptyMessage(1);

                }
            }
        }.start();
    }
};

Answer 1

“Cannot make a static reference to the non-static method sendEmptyMessage(int) from the type Handler”

This is due to the fact that Handler refers to a class, but sendEmptyMessage is not a static method (should be called on an object, and not on a class).

How to fix it?

To be able to call the sendEmptyMessage method you will either

1. Need to instantiate a Handler, i.e., do something like

   Handler h = new Handler();
   h.sendEmptyMessage(0);
   

   or

2. Add the static modifier to the sendEmptyMessage method:

   public static void sendEmptyMessage(int i) { ...
          ^^^^^^