MainActivity.java

package com.novoda.magicmirror;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.text.style.StyleSpan;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.AlphaAnimation;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.novoda.magicmirror.modules.DashboardModule;
import com.novoda.magicmirror.modules.DashboardModuleComposite;
import com.novoda.magicmirror.modules.time.TimeModule;
import com.novoda.magicmirror.modules.twitter.TwitterModule;
import com.novoda.magicmirror.modules.weather.WeatherIconMapper;
import com.novoda.magicmirror.modules.weather.WeatherInfo;
import com.novoda.magicmirror.modules.weather.WeatherModule;
import com.novoda.magicmirror.todo.TodoItemsAdapter;
import com.novoda.notils.caster.Views;

import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;

import twitter4j.Status;

public class MainActivity extends AppCompatActivity {

    private SystemUIHider systemUIHider;

    private TextView timeLabel;
    private TextView dateLabel;
    private TextView tweetLabel;
    private TextView weatherTemperatureLabel;
    private TextView todayForecastLabel;
    private ListView todoList;
    private DashboardModule modules;
    private ImageView todayForecastIcon;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        timeLabel = Views.findById(this, R.id.label_time);
        dateLabel = Views.findById(this, R.id.label_date);
        tweetLabel = Views.findById(this, R.id.label_tweet);
        todoList = Views.findById(this, R.id.todo_list);
        weatherTemperatureLabel = Views.findById(this, R.id.label_weather_temperature);
        todayForecastLabel = Views.findById(this, R.id.label_today_forecast);
        todayForecastIcon = Views.findById(this, R.id.weather_icon);

        systemUIHider = new SystemUIHider(findViewById(android.R.id.content));
        keepScreenOn();

        createModules();

        // TODO: TODOlist not displayed. To enable it uncomment the following line and swap visibility with label_tweet
        // createTodoList();
    }

    private void keepScreenOn() {
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    }

    private void createModules() {
        List<DashboardModule> modulesList = new ArrayList<>();
        modulesList.add(new TimeModule(timeLabel, dateLabel));
        modulesList.add(WeatherModule.newInstance(this, weatherListener));
        modulesList.add(TwitterModule.newInstance(this, tweetListener));

        modules = new DashboardModuleComposite(modulesList);
    }

    private void createTodoList() {
        CharSequence[] todoItems = getResources().getTextArray(R.array.todo_items);
        ArrayAdapter<CharSequence> adapter = new TodoItemsAdapter(this, R.layout.todo_list_item, todoItems);
        todoList.setAdapter(adapter);
    }

    @Override
    protected void onResume() {
        super.onResume();
        registerTimeTickReceiver();
        updateModules();
        systemUIHider.hideSystemUi();
    }

    private void registerTimeTickReceiver() {
        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_TIME_TICK);
        registerReceiver(timeTickReceiver, intentFilter);
    }

    private void updateModules() {
        modules.update();
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(timeTickReceiver);
        systemUIHider.showSystemUi();
    }

    @Override
    protected void onStop() {
        super.onStop();
        modules.stop();
    }

    private final BroadcastReceiver timeTickReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            updateModules();
        }
    };

    private final WeatherModule.WeatherListener weatherListener = new WeatherModule.WeatherListener() {

        @Override
        public void onCurrentWeatherFetched(WeatherInfo currentInfo) {
            DecimalFormat temperatureFormat = getTemperatureFormat();
            String currentTemperature = temperatureFormat.format(currentInfo.getTemperature()) + "°";
            weatherTemperatureLabel.setVisibility(View.VISIBLE);
            weatherTemperatureLabel.setText(currentTemperature);
        }

        @Override
        public void onTodayForecastFetched(WeatherInfo todayInfo) {
            DecimalFormat temperatureFormat = getTemperatureFormat();
            String minTemperature = temperatureFormat.format(todayInfo.getMinTemperature());
            String maxTemperature = temperatureFormat.format(todayInfo.getMaxTemperature());
            String todayCondition = getString(R.string.weather_condition, minTemperature, maxTemperature);
            todayForecastLabel.setVisibility(View.VISIBLE);
            todayForecastLabel.setText(todayCondition);

            int weatherResource = WeatherIconMapper.getWeatherResource(todayInfo.getIconId());
            todayForecastIcon.setImageResource(weatherResource);
        }

        @Override
        public void onCurrentWeatherUnavailable() {
            weatherTemperatureLabel.setVisibility(View.GONE);
        }

        @Override
        public void onTodayForecastUnavailable() {
            todayForecastLabel.setVisibility(View.GONE);
        }
    };

    private DecimalFormat getTemperatureFormat() {
        DecimalFormat temperatureFormat = new DecimalFormat("#.#");
        temperatureFormat.setRoundingMode(RoundingMode.HALF_DOWN);
        return temperatureFormat;
    }

    private final TwitterModule.TwitterListener tweetListener = new TwitterModule.TwitterListener() {

        @Override
        public void onNextTweet(final Status tweet) {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    displayTweet(tweet);
                }
            });
        }
    };

    private void displayTweet(Status tweet) {
        SpannableStringBuilder userHandle = highlightUserHandle(tweet.getUser().getScreenName());

        CharSequence text = TextUtils.concat(
                userHandle,
                "\n",
                tweet.getText()
        );

        AlphaAnimation fadeIn = new AlphaAnimation(0.0f, 1.0f);
        fadeIn.setDuration(getResources().getInteger(android.R.integer.config_shortAnimTime));
        tweetLabel.startAnimation(fadeIn);
        tweetLabel.setText(text);
    }

    private SpannableStringBuilder highlightUserHandle(String handle) {
        SpannableStringBuilder userHandle = new SpannableStringBuilder("@" + handle);
        StyleSpan style = new StyleSpan(Typeface.BOLD_ITALIC);
        userHandle.setSpan(style, 0, userHandle.length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
        return userHandle;
    }
}