Can't create handler inside thread that has not called Looper.prepare(). Reading phone contacts

Question

I"m trying to read contacts from phone on button click

but i'm getting the error "Can't create handler inside thread that has not called Looper.prepare()"

pDialog = new ProgressDialog(this);
        pDialog.setMessage("Reading contacts...");
        pDialog.setCancelable(false);

        updateBarHandler = new Handler();
        //putting read contacts on a separate thread

        mPickContact.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                       pDialog.show();
                        getContacts();
                    }

                }).start();

            }