How to put "wait" animation on Android?

Here's the code solution:

private class uploadPhoto extends AsyncTask<Void, Void, Void>{

            private ProgressDialog dialog;
        protected void onPostExecute(Void dResult) {

            dialog.cancel();

    }

    protected void onPreExecute() {


        dialog = new ProgressDialog(Myactivity.this);
        dialog.setCancelable(true);
        dialog.setMessage("uploading...");
        dialog.show();

            }

    protected Void doInBackground(Void... params) {
        // call upload photo here.
    }

}

To call asyncTask use:

new uploadPhoto().execute();

The answer was chosen from above, but as it worked, I'll show you how my code was corrected.

private String caminhoArquivo;
private ProgressDialog dialog;

private class BuscaCepTask extends AsyncTask<String, Void, String> {

    protected void onPreExecute() {
        dialog = new ProgressDialog(Formulario.this);
        dialog.setCancelable(true);
        dialog.setMessage("Buscando CEP...");
        dialog.show();
    }

    URL url = null;
    HttpURLConnection httpURLConnection = null;

    @Override
    protected String doInBackground(String... params) {
        StringBuilder result = null;
        int respCode = -1;

        try {
            url = new URL("http://cep.correiocontrol.com.br/" + params[0] + ".json");
            httpURLConnection = (HttpURLConnection) url.openConnection();

            do {
                if (httpURLConnection != null) {
                    respCode = httpURLConnection.getResponseCode();
                }
            } while (respCode == -1);

            if (respCode == HttpURLConnection.HTTP_OK) {
                BufferedReader br = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
                result = new StringBuilder();
                String line;
                while ((line = br.readLine()) != null) {
                    result.append(line);
                }
                br.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (httpURLConnection != null) {
                httpURLConnection.disconnect();
                httpURLConnection = null;
            }
        }

        return (result != null) ? result.toString() : null;
    }

    @Override
    protected void onPostExecute(String s) {
        dialog.cancel();
        super.onPostExecute(s);
        try {
            JSONObject object = new JSONObject(s);
            EditText rua = (EditText) findViewById(R.id.rua);
            rua.setText(object.getString("logradouro"));
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.formulario);

    final EditText endereco = (EditText) findViewById(R.id.endereco);
    endereco.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

        @Override
        public void afterTextChanged(Editable s) {
            if (endereco.length() == 8) {
                BuscaCepTask buscarCep = new BuscaCepTask();
                buscarCep.execute(endereco.getText().toString());
            }
        }
    });