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/*
* Navit, a modular navigation system.
* Copyright (C) 2005-2008 Navit Team
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program 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 this program; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
package org.navitproject.navit;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.location.Criteria;
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.support.v4.content.ContextCompat;
import android.util.Log;
import java.util.List;
public class NavitVehicle {
private static final String GPS_FIX_CHANGE = "android.location.GPS_FIX_CHANGE";
static Location sLastLocation;
private static LocationManager sLocationManager;
private Context mContext;
private long mVehiclePcbid;
private long mVehicleScbid;
private long mVehicleFcbid;
private String mFastProvider;
private static NavitLocationListener sPreciseLocationListener;
private static NavitLocationListener sFastLocationListener;
public native void vehicleCallback(long id, Location location);
public native void vehicleCallback(long id, int satsInView, int satsUsed);
public native void vehicleCallback(long id, int enabled);
private class NavitLocationListener extends BroadcastReceiver implements GpsStatus.Listener, LocationListener {
boolean mPrecise = false;
public void onLocationChanged(Location location) {
// Disable the fast provider if still active
if (mPrecise && mFastProvider != null) {
sLocationManager.removeUpdates(sFastLocationListener);
mFastProvider = null;
}
vehicleCallback(mVehiclePcbid, location);
vehicleCallback(mVehicleFcbid, 1);
}
public void onProviderDisabled(String provider) {
//unhandled
}
public void onProviderEnabled(String provider) {
//unhandled
}
public void onStatusChanged(String provider, int status, Bundle extras) {
//unhandled
}
/**
* Called when the status of the GPS changes.
*/
public void onGpsStatusChanged(int event) {
if (ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Permission is not granted
return;
}
GpsStatus status = sLocationManager.getGpsStatus(null);
int satsInView = 0;
int satsUsed = 0;
Iterable<GpsSatellite> sats = status.getSatellites();
for (GpsSatellite sat : sats) {
satsInView++;
if (sat.usedInFix()) {
satsUsed++;
}
}
vehicleCallback(mVehicleScbid, satsInView, satsUsed);
}
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(GPS_FIX_CHANGE)) {
if (intent.getBooleanExtra("enabled", false)) {
vehicleCallback(mVehicleFcbid, 1);
} else {
if (!intent.getBooleanExtra("enabled", true)) {
vehicleCallback(mVehicleFcbid, 0);
}
}
}
}
}
/**
* Creates a new {@code NavitVehicle}.
*
* @param context the context
* @param pcbid The address of the position callback function called when a location update is received
* @param scbid The address of the status callback function called when a status update is received
* @param fcbid The address of the fix callback function called when a
* {@code android.location.GPS_FIX_CHANGE} is received, indicating a change in GPS fix status
*/
NavitVehicle(Context context, long pcbid, long scbid, long fcbid) {
if (ContextCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Permission is not granted
return;
}
this.mContext = context;
sLocationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
sPreciseLocationListener = new NavitLocationListener();
sPreciseLocationListener.mPrecise = true;
sFastLocationListener = new NavitLocationListener();
/* Use 2 LocationProviders, one precise (usually GPS), and one
not so precise, but possible faster. The fast provider is
disabled when the precise provider gets its first fix. */
// Selection criteria for the precise provider
Criteria highCriteria = new Criteria();
highCriteria.setAccuracy(Criteria.ACCURACY_FINE);
highCriteria.setAltitudeRequired(true);
highCriteria.setBearingRequired(true);
highCriteria.setCostAllowed(true);
highCriteria.setPowerRequirement(Criteria.POWER_HIGH);
// Selection criteria for the fast provider
Criteria lowCriteria = new Criteria();
lowCriteria.setAccuracy(Criteria.ACCURACY_COARSE);
lowCriteria.setAltitudeRequired(false);
lowCriteria.setBearingRequired(false);
lowCriteria.setCostAllowed(true);
lowCriteria.setPowerRequirement(Criteria.POWER_HIGH);
Log.d("NavitVehicle", "Providers " + sLocationManager.getAllProviders());
String mPreciseProvider = sLocationManager.getBestProvider(highCriteria, false);
Log.d("NavitVehicle", "Precise Provider " + mPreciseProvider);
mFastProvider = sLocationManager.getBestProvider(lowCriteria, false);
Log.d("NavitVehicle", "Fast Provider " + mFastProvider);
mVehiclePcbid = pcbid;
mVehicleScbid = scbid;
mVehicleFcbid = fcbid;
context.registerReceiver(sPreciseLocationListener, new IntentFilter(GPS_FIX_CHANGE));
sLocationManager.requestLocationUpdates(mPreciseProvider, 0, 0, sPreciseLocationListener);
sLocationManager.addGpsStatusListener(sPreciseLocationListener);
/*
* Since Android criteria have no way to specify "fast fix", lowCriteria may return the same
* provider as highCriteria, even if others are available. In this case, do not register two
* listeners for the same provider but pick the fast provider manually. (Usually there will
* only be two providers in total, which makes the choice easy.)
*/
if (mFastProvider == null || mPreciseProvider.compareTo(mFastProvider) == 0) {
List<String> fastProviderList = sLocationManager.getProviders(lowCriteria, false);
mFastProvider = null;
for (String fastCandidate: fastProviderList) {
if (mPreciseProvider.compareTo(fastCandidate) != 0) {
mFastProvider = fastCandidate;
break;
}
}
}
if (mFastProvider != null) {
sLocationManager.requestLocationUpdates(mFastProvider, 0, 0, sFastLocationListener);
}
}
static void removeListeners(Navit navit) {
if (sLocationManager != null) {
if (sPreciseLocationListener != null) {
sLocationManager.removeUpdates(sPreciseLocationListener);
sLocationManager.removeGpsStatusListener(sPreciseLocationListener);
navit.unregisterReceiver(sPreciseLocationListener);
}
if (sFastLocationListener != null) {
sLocationManager.removeUpdates(sFastLocationListener);
}
}
}
}
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