LanguagesFragment.java

package com.corewillsoft.usetool.ui.fragments;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Bundle;
import android.preference.PreferenceFragment;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.corewillsoft.usetool.R;
import com.google.inject.Inject;

import java.util.Locale;

import de.greenrobot.event.EventBus;
import roboguice.RoboGuice;

/**
 * Represents supported by the app languages
 *
 * @see com.corewillsoft.usetool.utils.LanguageSwitcher
 */
public class LanguagesFragment extends PreferenceFragment {

    public static final String KEY_SELECTED_LANGUAGE = "KEY_SELECTED_LANGUAGE";

    /**
     * Supported by the app languages
     */
    public enum SupportedLanguage {
        DEFAULT(Locale.getDefault()),
        ENGLISH(Locale.ENGLISH),
        GERMAN(Locale.GERMAN),
        SPANISH(new Locale("es")),
        RUSSIAN(new Locale("ru")),
        CHINESE(Locale.SIMPLIFIED_CHINESE),
        POLISH(new Locale("pl")),
        ITALIAN(Locale.ITALIAN),
        PORTUGUESE(new Locale("pt"));

        public final Locale locale;

        SupportedLanguage(Locale locale) {
            this.locale = locale;
        }

        /**
         * @param context
         * @return language names in it's specific locale
         */
        public String getDisplayName(Context context) {
            switch (this) {
                case DEFAULT:
                    return context.getString(R.string.settings_default_language_title, getCapitalizedLanguageName());
                default:
                    return getCapitalizedLanguageName();
            }
        }

        private String getCapitalizedLanguageName() {
            StringBuilder sb = new StringBuilder(locale.getDisplayLanguage(locale));
            if (!TextUtils.isEmpty(sb)) {
                sb.setCharAt(0, Character.toUpperCase(sb.charAt(0)));
            }
            return sb.toString();
        }
    }

    @Inject
    private SharedPreferences preferences;
    @Inject
    private Resources resources;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        RoboGuice.getInjector(getActivity()).injectMembersWithoutViews(this);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_languages, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        ListView listView = (ListView) view;
        listView.setAdapter(new ArrayAdapter<SupportedLanguage>(getActivity(), R.layout.preference_list_item, SupportedLanguage.values()) {
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                TextView view = (TextView) super.getView(position, convertView, parent);
                view.setText(getItem(position).getDisplayName(getActivity()));
                return view;
            }
        });
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                SupportedLanguage language = (SupportedLanguage) adapterView.getItemAtPosition(i);
                Locale.setDefault(language.locale);
                Configuration c = new Configuration();
                c.locale = language.locale;
                resources.updateConfiguration(c, resources.getDisplayMetrics());
                preferences.edit().putInt(KEY_SELECTED_LANGUAGE, language.ordinal()).apply();
                getActivity().finish();
            }
        });
        ((View)view.getParent().getParent()).setBackgroundResource(R.color.settings_background);
    }
}