问onProgressUpdate未运行

EN

public class MindicadorTask extends AsyncTask<Void, Void, Void> {

        private String TAG = MindicadorTask.class.getSimpleName();

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            Toast.makeText(MainActivity.this, "JSON Downloading", Toast.LENGTH_SHORT).show();
        }

        @Override
        protected Void doInBackground(Void... voids) {

            Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl(IMindicador.BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
            IMindicador iMindicador = retrofit.create(IMindicador.class);

            Call<Mindicador> call = iMindicador.getAPI();

            mMindicador = new Mindicador();
            try {
                mMindicador = call.execute().body();
            } catch (IOException e) {
                Log.e(TAG, "" + e.getMessage());
            }

            return null;
        }

        @Override
        protected void onProgressUpdate(Void... values) {
            super.onProgressUpdate(values);
            Log.e(TAG, "onProgressUpdate was called");
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            Toast.makeText(MainActivity.this, "JSON Call was sucessfull", Toast.LENGTH_SHORT).show();
        }
    }