ru.timakden.yacer2.MainFragment.java Source code

Introduction

Here is the source code for ru.timakden.yacer2.MainFragment.java

Source

/*
 * Copyright 2016 Denis Timakov
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ru.timakden.yacer2;

import android.app.Fragment;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import ru.timakden.yacer2.util.ExchangeRateAdapter;
import ru.timakden.yacer2.util.db.dao.DaoSession;
import ru.timakden.yacer2.util.db.dao.ExchangeRateDao;
import ru.timakden.yacer2.util.db.model.ExchangeRate;
import ru.timakden.yacer2.util.update.Updater;

import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;

public class MainFragment extends Fragment {
    private static final String LOG_TAG = MainFragment.class.getSimpleName();
    private SwipeRefreshLayout swipeRefreshLayout;

    @Override
    public void onStart() {
        super.onStart();

        // ??  ??    ?
        populateList();

        // ? SharedPreferences ? ?  ? ?. ? ?,  ?
        //  ?; ? ,  ?  RecyclerView   .
        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
        boolean updated = sharedPreferences.getBoolean("updated", false);
        boolean updateAtStartup = sharedPreferences.getBoolean(getString(R.string.update_at_startup_key), true);

        if (updateAtStartup && !updated) {
            sharedPreferences.edit().putBoolean("updated", true).apply();
            swipeRefreshLayout.postDelayed(new Runnable() {
                @Override
                public void run() {
                    swipeRefreshLayout.setRefreshing(true);
                    new UpdateTask().execute();
                }
            }, 1000);
        } else {
            populateList();
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        swipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_refresh_layout);
        swipeRefreshLayout.setColorSchemeResources(R.color.red, R.color.green, R.color.blue);

        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                new UpdateTask().execute();
            }
        });
        return rootView;
    }

    /**
     *  ListView ?   .
     */
    public void populateList() {
        DaoSession daoSession = ((YacerApplication) getActivity().getApplicationContext()).getDaoSession();
        ExchangeRateDao exchangeRateDao = daoSession.getExchangeRateDao();

        //  ?  ? ?
        long date = 0;
        try {
            date = exchangeRateDao.queryBuilder().limit(1).distinct().orderDesc(ExchangeRateDao.Properties.Date)
                    .unique().getDate();
        } catch (Exception e) {
            Log.e(LOG_TAG, "Error Message: " + e.getMessage(), e);
        }

        //  ?? ?
        String rawSql = ", CURRENCY C WHERE T.DATE = ? AND C._ID = T.CURRENCY_ID ORDER BY C.SORT_ORDER ASC";
        List<ExchangeRate> exchangeRates = exchangeRateDao.queryRawCreate(rawSql, date).list();

        if (exchangeRates.size() == 0) {
            Toast.makeText(getActivity(), R.string.populate_list_failed, Toast.LENGTH_SHORT).show();
        } else {
            AppCompatActivity appCompatActivity = (AppCompatActivity) getActivity();
            ActionBar supportActionBar = appCompatActivity.getSupportActionBar();
            if (supportActionBar != null) {
                //  ??   ? UTC,       UTC
                long dateInMilliseconds = TimeUnit.SECONDS.toMillis(exchangeRates.get(0).getDate());
                DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.FULL);
                dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));

                String dateString = dateFormat.format(new Date(dateInMilliseconds));
                supportActionBar.setSubtitle(dateString);
            }

            RecyclerView recyclerView = (RecyclerView) getActivity().findViewById(R.id.recycler_view);
            recyclerView.setHasFixedSize(true);

            LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
            recyclerView.setLayoutManager(linearLayoutManager);

            ExchangeRateAdapter exchangeRateAdapter = new ExchangeRateAdapter(exchangeRates, getActivity());
            recyclerView.setAdapter(exchangeRateAdapter);
        }

        if (swipeRefreshLayout.isRefreshing()) {
            swipeRefreshLayout.setRefreshing(false);
        }
    }

    /**
     * ? ?? ? ? ?    ?  {@code AsyncTask}.
     */
    private class UpdateTask extends AsyncTask<Void, Void, Integer> {

        @Override
        protected void onPostExecute(Integer integer) {
            switch (integer) {
            case Updater.NO_NETWORK:
                Toast.makeText(getActivity(), R.string.no_connection, Toast.LENGTH_SHORT).show();
                break;
            case Updater.EXCEPTION_DURING_UPDATE:
                Toast.makeText(getActivity(), R.string.update_failed, Toast.LENGTH_SHORT).show();
            }
            populateList();
            super.onPostExecute(integer);
        }

        @Override
        protected Integer doInBackground(Void... params) {
            return Updater.update(getActivity());
        }
    }
}