Java tutorial
/* MIT License Copyright (c) 2016 Emmanuel Mathi-Amorim Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ package com.mathi_amorim.emmanuel.metrictime; import android.app.NotificationManager; import android.app.PendingIntent; import android.app.Service; import android.appwidget.AppWidgetManager; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.hardware.display.DisplayManager; import android.os.Build; import android.os.IBinder; import android.os.PowerManager; import android.preference.PreferenceManager; import android.support.v4.app.NotificationCompat; import android.view.Display; import android.widget.RemoteViews; import java.util.Calendar; public final class UpdateTimeService extends Service { private static Calendar mCalendar; private final static IntentFilter mTimeIntentFilter = new IntentFilter(); private final static IntentFilter mScreenIntentFilter = new IntentFilter(); static { mTimeIntentFilter.addAction(Intent.ACTION_TIME_TICK); mTimeIntentFilter.addAction(Intent.ACTION_TIME_CHANGED); mTimeIntentFilter.addAction(Intent.ACTION_TIMEZONE_CHANGED); mScreenIntentFilter.addAction(Intent.ACTION_SCREEN_ON); mScreenIntentFilter.addAction(Intent.ACTION_SCREEN_OFF); } @Override public void onCreate() { super.onCreate(); mCalendar = Calendar.getInstance(); if (isScreenOn()) { registerReceiver(mTimeChangedReceiver, mTimeIntentFilter); } registerReceiver(mScreenChangedReceiver, mScreenIntentFilter); SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this); Config.showNotification = sharedPref.getBoolean(SettingsActivity.KEY_PREF_SHOW_NOTIFICATION, true); } @Override public void onDestroy() { super.onDestroy(); unregisterReceiver(mTimeChangedReceiver); } @Override public int onStartCommand(Intent intent, int flags, int startId) { super.onStartCommand(intent, flags, startId); updateWidget(); updateNotification(); return START_STICKY; } @Override public IBinder onBind(Intent intent) { return null; } public boolean isScreenOn() { if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) { DisplayManager dm = (DisplayManager) getSystemService(Context.DISPLAY_SERVICE); boolean screenOn = false; for (Display display : dm.getDisplays()) { if (display.getState() != Display.STATE_OFF) { screenOn = true; } } return screenOn; } else { PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE); //noinspection deprecation return pm.isScreenOn(); } } private final BroadcastReceiver mTimeChangedReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (isScreenOn()) { updateWidget(); updateNotification(); } } }; private final BroadcastReceiver mScreenChangedReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals("android.intent.action.SCREEN_ON")) { updateWidget(); updateNotification(); registerReceiver(mTimeChangedReceiver, mTimeIntentFilter); } else if (intent.getAction().equals("android.intent.action.SCREEN_OFF")) { unregisterReceiver(mTimeChangedReceiver); } } }; private void updateWidget() { mCalendar.setTimeInMillis(System.currentTimeMillis()); MetricTime time = MetricTimeConverter.currentMetricTime(); String currentTime = String.format("%1$01d:%2$02d", time.hours, time.minutes); RemoteViews mRemoteViews = new RemoteViews(getPackageName(), R.layout.metric_time_widget); mRemoteViews.setTextViewText(R.id.widget1label, currentTime); Intent intent = new Intent(this, MainActivity.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0); mRemoteViews.setOnClickPendingIntent(R.id.widget1label, pendingIntent); ComponentName mComponentName = new ComponentName(this, MetricTimeWidgetProvider.class); AppWidgetManager mAppWidgetManager = AppWidgetManager.getInstance(this); mAppWidgetManager.updateAppWidget(mComponentName, mRemoteViews); } private void updateNotification() { if (Config.showNotification) { MetricTime time = MetricTimeConverter.currentMetricTime(); String currentTime = String.format("%1$01d:%2$02d", time.hours, time.minutes); Intent intent = new Intent(this, SettingsActivity.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0); NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this); mBuilder.setSmallIcon(R.mipmap.ic_launcher); mBuilder.setContentTitle("Metric Time"); mBuilder.setContentText(currentTime); mBuilder.setOngoing(true); mBuilder.setContentIntent(pendingIntent); int mNotificationId = 1; NotificationManager mNotifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); mNotifyMgr.notify(mNotificationId, mBuilder.build()); } else { NotificationManager mNotifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); mNotifyMgr.cancelAll(); } } }