Java tutorial
/* * Copyright 2013 Michael von Glasow. * * This file is part of LSRN Tools. * * LSRN Tools is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * LSRN Tools is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with LSRN Tools. If not, see <http://www.gnu.org/licenses/>. */ package com.vonglasow.michael.satstat; import android.app.NotificationManager; import android.app.PendingIntent; import android.app.Service; import android.support.v4.app.TaskStackBuilder; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.content.SharedPreferences.OnSharedPreferenceChangeListener; import android.location.GpsSatellite; import android.location.GpsStatus; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.os.IBinder; import android.preference.PreferenceManager; import android.support.v4.app.NotificationCompat; import android.util.Log; import android.widget.Toast; public class PasvLocListenerService extends Service implements GpsStatus.Listener, LocationListener, OnSharedPreferenceChangeListener { // The unique ID for the notification private static final int ONGOING_NOTIFICATION = 1; // GPS status values private static final int GPS_INACTIVE = 0; private static final int GPS_SEARCH = 1; private static final int GPS_FIX = 2; private int mStatus = GPS_INACTIVE; private boolean mNotifyFix = false; private boolean mNotifySearch = false; private LocationManager mLocationManager; private NotificationCompat.Builder mBuilder; private NotificationManager mNotificationManager; private SharedPreferences mSharedPreferences; private BroadcastReceiver mGpsStatusReceiver = new BroadcastReceiver() { @Override public void onReceive(Context c, Intent intent) { if (intent == null) return; if (intent.getAction().equals(GpsEventReceiver.GPS_ENABLED_CHANGE) && !intent.getBooleanExtra("enabled", true)) { // GPS_ENABLED_CHANGE, enabled=false: GPS disabled, dismiss notification mStatus = GPS_INACTIVE; stopForeground(true); } else if (intent.getAction().equals(GpsEventReceiver.GPS_FIX_CHANGE) && intent.getBooleanExtra("enabled", false)) { // GPS_FIX_CHANGE, enabled=true: GPS got fix, will be taken care of in onLocationChanged mStatus = GPS_FIX; } else { // GPS_ENABLED_CHANGE, enabled=true: GPS enabled // GPS_FIX_CHANGE, enabled=false: GPS lost fix mStatus = GPS_SEARCH; showStatusNoLocation(); } } }; @Override public IBinder onBind(Intent arg0) { return null; } @Override public void onCreate() { super.onCreate(); //do we need that here? mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); registerReceiver(mGpsStatusReceiver, new IntentFilter(GpsEventReceiver.GPS_ENABLED_CHANGE)); registerReceiver(mGpsStatusReceiver, new IntentFilter(GpsEventReceiver.GPS_FIX_CHANGE)); } @Override public void onDestroy() { stopForeground(true); unregisterReceiver(mGpsStatusReceiver); mLocationManager.removeUpdates(this); mLocationManager.removeGpsStatusListener(this); mSharedPreferences.unregisterOnSharedPreferenceChangeListener(this); } @Override public void onGpsStatusChanged(int event) { GpsStatus status = mLocationManager.getGpsStatus(null); int satsUsed = 0; Iterable<GpsSatellite> sats = status.getSatellites(); for (GpsSatellite sat : sats) { if (sat.usedInFix()) { satsUsed++; } } if (satsUsed == 0) { if (mStatus != GPS_INACTIVE) mStatus = GPS_SEARCH; showStatusNoLocation(); } } @Override public void onLocationChanged(Location location) { if (!location.getProvider().equals(LocationManager.GPS_PROVIDER)) return; if (mNotifyFix && (mStatus != GPS_INACTIVE)) { mStatus = GPS_FIX; GpsStatus status = mLocationManager.getGpsStatus(null); int satsInView = 0; int satsUsed = 0; Iterable<GpsSatellite> sats = status.getSatellites(); for (GpsSatellite sat : sats) { satsInView++; if (sat.usedInFix()) { satsUsed++; } } double lat = Math.abs(location.getLatitude()); double lon = Math.abs(location.getLongitude()); String ns = (location.getLatitude() > 0) ? getString(R.string.value_N) : (location.getLatitude() < 0) ? getString(R.string.value_S) : ""; String ew = (location.getLongitude() > 0) ? getString(R.string.value_E) : (location.getLongitude() < 0) ? getString(R.string.value_W) : ""; String title = String.format("%.5f%s%s %.5f%s%s", lat, getString(R.string.unit_degree), ns, lon, getString(R.string.unit_degree), ew); String text = ""; if (location.hasAltitude()) { text = text + String.format("%.0f%s", location.getAltitude(), getString(R.string.unit_meter)); } if (location.hasSpeed()) { text = text + (text.equals("") ? "" : ", ") + String.format("%.0f%s", (location.getSpeed() * 3.6), getString(R.string.unit_km_h)); } if (location.hasAccuracy()) { text = text + (text.equals("") ? "" : ", ") + String.format("\u03b5 = %.0f%s", location.getAccuracy(), getString(R.string.unit_meter)); } text = text + (text.equals("") ? "" : ", ") + String.format("%d/%d", satsUsed, satsInView); text = text + (text.equals("") ? "" : ",\n") + String.format("TTFF %d s", status.getTimeToFirstFix() / 1000); mBuilder.setSmallIcon(R.drawable.ic_stat_notify_location); mBuilder.setContentTitle(title); mBuilder.setContentText(text); mBuilder.setStyle(new NotificationCompat.BigTextStyle().bigText(text)); startForeground(ONGOING_NOTIFICATION, mBuilder.build()); } else { stopForeground(true); } } @Override public void onProviderDisabled(String provider) { // TODO Auto-generated method stub } @Override public void onProviderEnabled(String provider) { // TODO Auto-generated method stub } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { if (key.equals(SettingsActivity.KEY_PREF_NOTIFY_FIX) || key.equals(SettingsActivity.KEY_PREF_NOTIFY_SEARCH)) { mNotifyFix = sharedPreferences.getBoolean(SettingsActivity.KEY_PREF_NOTIFY_FIX, false); mNotifySearch = sharedPreferences.getBoolean(SettingsActivity.KEY_PREF_NOTIFY_SEARCH, false); if (!(mNotifyFix || mNotifySearch)) { stopSelf(); } } } @Override public int onStartCommand(Intent intent, int flags, int startId) { mSharedPreferences.registerOnSharedPreferenceChangeListener(this); mNotifyFix = mSharedPreferences.getBoolean(SettingsActivity.KEY_PREF_NOTIFY_FIX, false); mNotifySearch = mSharedPreferences.getBoolean(SettingsActivity.KEY_PREF_NOTIFY_SEARCH, false); if (mLocationManager.getAllProviders().indexOf(LocationManager.PASSIVE_PROVIDER) >= 0) { mLocationManager.requestLocationUpdates(LocationManager.PASSIVE_PROVIDER, 0, 0, this); } else { Log.w("PasvLocListenerService", "No passive location provider found. Data display will not be available."); } mLocationManager.addGpsStatusListener(this); mBuilder = new NotificationCompat.Builder(this).setSmallIcon(R.drawable.ic_stat_notify_location) .setContentTitle(getString(R.string.value_none)).setContentText(getString(R.string.value_none)) .setWhen(0); Intent mainIntent = new Intent(this, MainActivity.class); TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); stackBuilder.addParentStack(MainActivity.class); stackBuilder.addNextIntent(mainIntent); PendingIntent mainPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT); mBuilder.setContentIntent(mainPendingIntent); // if we were started through a broadcast, mGpsStatusReceiver had // no way of picking it up, so we need to forward it manually mGpsStatusReceiver.onReceive(this, intent); return START_STICKY; } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } public void showStatusNoLocation() { if (mNotifySearch && (mStatus != GPS_INACTIVE)) { mBuilder.setSmallIcon(R.drawable.ic_stat_notify_nolocation); mBuilder.setContentTitle(getString(R.string.notify_nolocation_title)); mBuilder.setContentText(getString(R.string.notify_nolocation_body)); mBuilder.setStyle(null); startForeground(ONGOING_NOTIFICATION, mBuilder.build()); } else { stopForeground(true); } } }