import android.content.Intent;

import android.os.Bundle;

import androidx.activity.result.contract.ActivityResultContracts;

import androidx.appcompat.app.AppCompatActivity;

import androidx.lifecycle.LiveData;

    List<String> langs;

    String selectedLanguage = "";

    private SwipeRefreshLayout refresher;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

            refresh();

        }

        list_view.setOnItemClickListener((parent, view, position, id) -> {

            Intent intent = new Intent(DictionaryActivity.this, DictionaryDownloadActivity.class);

            intent.putExtra(DictionaryDownloadActivity.EXTRA_DICTIONARY, DictionaryFactory.get(position).getName());

        });

        lang_view.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

    }

    private void refresh() {

        downloadThread.start();

    }

    private void setObserver() {

        LiveData<Boolean> data = downloadThread.getRefreshingData();

        data.observe(this, refreshing -> {

            refresher.setRefreshing(refreshing);

                updateDataSet();

        });

    }

    private void unsetObserver() {

        LiveData<Boolean> data = downloadThread.getRefreshingData();

        data.removeObservers(this);

    }

        public void run() {

            refreshing.postValue(true);

            update();

        }

        private void update() {