package com.countdowntimerservice;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.util.Log;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * Created by igord on 21/09/2017.
 */

public class BootReceiver extends BroadcastReceiver {

    String date_time;
    Calendar calendar;
    SimpleDateFormat simpleDateFormat;
    SharedPreferences.Editor mEditor;
    SharedPreferences mpref;
    Date horaquedesligou;
    Date horaatual;
    Date temporestante;


    @Override
    public void onReceive(Context context, Intent intent) {
        mpref = PreferenceManager.getDefaultSharedPreferences(context);
        mEditor = mpref.edit();
        calendar = Calendar.getInstance();
        simpleDateFormat = new SimpleDateFormat("HH:mm:ss");
        date_time = simpleDateFormat.format(calendar.getTime());
        String horaquedesligous = mpref.getString("horatelefone","");
        String temporestanntes = mpref.getString("tempofaltando","");
       /* try {
            horaquedesligou = simpleDateFormat.parse(horaquedesligous);
            horaatual = simpleDateFormat.parse(date_time);
            temporestante = simpleDateFormat.parse(temporestanntes);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        long diferenca = horaquedesligou.getTime() - horaatual.getTime();
        long horasrestantes = temporestante.getTime()-diferenca;*/

        mEditor.putString("data", date_time).commit();

        mEditor.putString("hours","" /*Aqui tenho que passar as horas restantes*/).commit();


        Intent intent_service = new Intent(context, Timer_Service.class);
        context.startService(intent_service);
        Log.e("igr", "iniciou servico do timer");
    }
}

package com.countdowntimerservice;


import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.support.annotation.Nullable;
import android.util.Log;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

public class Timer_Service extends Service {

    public static String str_receiver = "com.countdowntimerservice.receiver";

    private Handler mHandler = new Handler();
    Calendar calendar;
    SimpleDateFormat simpleDateFormat;
    String strDate;
    Date date_current, date_diff;
    SharedPreferences mpref;
    SharedPreferences.Editor mEditor;

    private Timer mTimer = null;
    public static final long NOTIFY_INTERVAL = 1000;
    Intent intent;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

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

        mpref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        mEditor = mpref.edit();
        calendar = Calendar.getInstance();
        simpleDateFormat = new SimpleDateFormat("HH:mm:ss");

        mTimer = new Timer();
        mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 5, NOTIFY_INTERVAL);
        intent = new Intent(str_receiver);
    }


    class TimeDisplayTimerTask extends TimerTask {

        @Override
        public void run() {
            mHandler.post(new Runnable() {

                @Override
                public void run() {

                    calendar = Calendar.getInstance();
                    simpleDateFormat = new SimpleDateFormat("HH:mm:ss");
                    strDate = simpleDateFormat.format(calendar.getTime());
                    Log.e("strDate", strDate);
                    mEditor.putString("horatelefone", strDate).commit();

                    twoDatesBetweenTime();

                }

            });
        }

    }

    public String twoDatesBetweenTime() {


        try {
            date_current = simpleDateFormat.parse(strDate);
        } catch (Exception e) {

        }

        try {
            date_diff = simpleDateFormat.parse(mpref.getString("data", ""));
        } catch (Exception e) {

        }

        try {


            long diff = date_current.getTime() - date_diff.getTime();
            int int_hours = Integer.valueOf(mpref.getString("hours", ""));

            long int_timer = TimeUnit.HOURS.toMillis(int_hours);
            long long_hours = int_timer - diff;
            long diffSeconds2 = long_hours / 1000 % 60;
            long diffMinutes2 = long_hours / (60 * 1000) % 60;
            long diffHours2 = long_hours / (60 * 60 * 1000) % 24;


            if (long_hours > 0) {
                String str_testing = diffHours2 + ":" + diffMinutes2 + ":" + diffSeconds2;

                Log.e("TIME", str_testing);

                fn_update(str_testing);
            } else {
                mEditor.putBoolean("finish", true).commit();
                mTimer.cancel();
            }
        }catch (Exception e){
            mTimer.cancel();
            mTimer.purge();

        }

        return "";

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.e("Serivco finalizado","Finalizado");
    }

    private void fn_update(String str_time){
        mEditor.putString("tempofaltando", str_time).commit();

        intent.putExtra("time",str_time);
        sendBroadcast(intent);
    }
}