ClockService

ClockService.java

package com.albertoromero.timeclock.services;

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;

import androidx.annotation.Nullable;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;

import com.albertoromero.timeclock.utils.NotificationUtils;

public class ClockService extends Service {
    public static final String ACTION_START_TIMER = "action.START_TIMER";
    public static final String ACTION_PAUSE_TIMER = "action.PAUSE_TIMER";
    public static final String ACTION_RESET_TIMER = "action.RESET_TIMER";
    public static final String TIMER_UPDATE_ACTION = "action.TIMER_UPDATE";
    public static final String EXTRA_TIME_LEFT = "EXTRA_TIME_LEFT";
    public static final String EXTRA_TIME = "EXTRA_TIME";

    private final Handler handler = new Handler();
    private long timeLeftInMillis;
    private boolean isTimerRunning;

    private long defaultTimeMilis = 60 * 1000;

    private final Runnable timerRunnable = new Runnable() {
        @Override
        public void run() {
            if (isTimerRunning) {
                timeLeftInMillis -= 1000;
                if (timeLeftInMillis <= 0) {
                    isTimerRunning = false;

                    NotificationUtils.showNotification("Time's up!", "Time's up!");
                }

                // Broadcast time left
                broadcastTimeLeft();

                if (isTimerRunning) {
                    handler.postDelayed(this, 1000);
                }
            }
        }
    };

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (intent != null) {
            String action = intent.getAction();
            if (ACTION_START_TIMER.equals(action)) {
                long time = intent.getLongExtra(EXTRA_TIME, defaultTimeMilis);
                startTimer(timeLeftInMillis > 0 ? timeLeftInMillis : time);
            } else if (ACTION_PAUSE_TIMER.equals(action)) {
                pauseTimer();
            } else if (ACTION_RESET_TIMER.equals(action)) {
                long time = intent.getLongExtra(EXTRA_TIME, defaultTimeMilis);
                resetTimer(time);
            }
        }
        return START_STICKY;
    }

    private void startTimer(long timeInMillis) {
        if (isTimerRunning) return;

        this.timeLeftInMillis = timeInMillis;
        this.isTimerRunning = true;
        handler.post(timerRunnable);
    }

    private void pauseTimer() {
        isTimerRunning = false;
    }

    private void resetTimer(long timeInMillis) {
        this.timeLeftInMillis = timeInMillis;
        isTimerRunning = false;

        broadcastTimeLeft();
    }

    private void broadcastTimeLeft()
    {
        Intent intent = new Intent(TIMER_UPDATE_ACTION);
        intent.putExtra(EXTRA_TIME_LEFT, timeLeftInMillis);
        LocalBroadcastManager.getInstance(ClockService.this).sendBroadcast(intent);
    }


    @Override
    public void onDestroy() {
        super.onDestroy();
        handler.removeCallbacks(timerRunnable);
    }



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