WordsActivity question

WordsActivity.java

public class WordsActivity extends AppCompatActivity implements TextToSpeech.OnInitListener {
public final static String TTS = "TTS";
private HashMap<String, Locale> availableLangs;
private WordsAdapter adapter;
private RecyclerView mRecyclerView;
private VocaNoteViewModel mVocaNoteViewModel;
private String origWord;
private String nameGroup;
private String language;
private String translation;
private TextToSpeech ttsOrigLang;
private TextToSpeech ttsLocalLang;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_words);
    //Text-To-Speech object to pronounce words
    // TODO: 05.04.2018 Optimize work of TextToSpeech objects
    ttsLocalLang = new TextToSpeech(this, this);
    ttsOrigLang = new TextToSpeech(this, this);
    //Creating of toolbar with title Words
    Toolbar myToolbar = findViewById(R.id.toolbar_words);
    setSupportActionBar(myToolbar);
    //Enable Up Button
    ActionBar ab = getSupportActionBar();
    ab.setDisplayHomeAsUpEnabled(true);
    //Values of nameGroup and language fields are recieving from another activity within intent
    //It's not being showed here for purpose of simplicity
    nameGroup = "Hello";
    language = "English";
    //RecyclerView containing the list of VocaNotes with sound icons
    mRecyclerView = initRecyclerView();
    //Using ViewModel to observe VocaNote data
    mVocaNoteViewModel = ViewModelProviders.of(this).get(VocaNoteViewModel.class);
    mVocaNoteViewModel.getByGroupVcVocaNote(nameGroup).observe(this, new Observer<List<VocaNote>>() {

        @Override
        public void onChanged(@Nullable List<VocaNote> vocaNotes) {
            adapter.setVocaNotes(vocaNotes);
        }
    });
}

protected RecyclerView initRecyclerView() {
    RecyclerView recyclerView = findViewById(R.id.words_recycler_view);
    LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);
    OnItemClicked listener = (v, position) -> {
        origWord = adapter.getFilteredVocaNotes().get(position).getOriginWord();
        translation = adapter.getFilteredVocaNotes().get(position).getTranslation();
        switch (v.getId()) {
            case R.id.word_sound:
                // TODO: 05.04.2018 Make icon more accssesible
                speakOut();
                break;
            default:
                Log.i("TAG", "Pushed the item with word");
                break;
        }
    };
    adapter = new WordsAdapter(this, listener);
    adapter.notifyItemInserted(adapter.getItemCount());
    recyclerView.setAdapter(adapter);
    return recyclerView;
}

@Override
public void onInit(int status) {
    if (status == TextToSpeech.SUCCESS) {
        int resultOrig = ttsOrigLang.setLanguage(chooseLang(language));
        int resultLocal = ttsLocalLang.setLanguage(Locale.getDefault());
        if ((resultOrig == TextToSpeech.LANG_MISSING_DATA
                || resultOrig == TextToSpeech.LANG_NOT_SUPPORTED)
                || (resultLocal == TextToSpeech.LANG_MISSING_DATA
                || resultLocal == TextToSpeech.LANG_NOT_SUPPORTED)) {
            Log.e(TTS, "This Language is not supported");
        }
    }
}

private void speakOut() {
    if (origWord != null) {
        ttsOrigLang.speak(origWord, TextToSpeech.QUEUE_FLUSH, null);
        ttsLocalLang.speak(translation, TextToSpeech.QUEUE_ADD, null);
    }
}

@Override
public void onDestroy() {
    /*Shutting down TextToSpeech*/
    if (ttsOrigLang != null) {
        ttsOrigLang.stop();
        ttsOrigLang.shutdown();
        ttsLocalLang.stop();
        ttsLocalLang.shutdown();
    }
    super.onDestroy();
}

private Locale chooseLang(String language) {
    availableLangs = new HashMap<>();
    availableLangs.put(getResources().getStringArray(R.array.spinner_values)[0], Locale.UK);
    availableLangs.put(getResources().getStringArray(R.array.spinner_values)[1], new Locale("spa", "ESP"));
    availableLangs.put(getResources().getStringArray(R.array.spinner_values)[2], Locale.ITALY);
    availableLangs.put(getResources().getStringArray(R.array.spinner_values)[3], Locale.FRANCE);
    availableLangs.put(getResources().getStringArray(R.array.spinner_values)[4], Locale.GERMANY);

    return availableLangs.get(language);
}
}