Spinner spinner = (Spinner) findViewById(R.id.sourceSpinner);

        ArrayList<CharSequence> sources = new ArrayList<>();
        sl = SourceList.getInstance();

        for(int i = 0; i < sl.size(); i++){
            sources.add(sl.get(i).getName());
        }

        ArrayAdapter<CharSequence> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, sources);

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                actualSource = sl.get(position);
                actualPage = 1;
                loadedPage = 0;
                frag.clearArticles();
                fetchNews();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });