forked from upstream-mirrors/OpenTracks
Multiple improvements to the data hub:
* Making registration finer-grained so we only listen to the data we really need. * Moving the system listener registration to an external class (for testability and readability) * Adding a unit test (not yet complete) * Adding documention and cleaning up comments Still many things TODO: * Allow pausing of registrations * Add pause/resume to onPause/onResume of activities * Move sampling logic out of the hub * Optimize data reloading when display preferences change * (maybe) move the data hub and related classes to the "content" package
This commit is contained in:
Rodrigo Damazio
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/*
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* Copyright 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.google.android.apps.mytracks;
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import static com.google.android.apps.mytracks.Constants.MAX_LOCATION_AGE_MS;
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import static com.google.android.apps.mytracks.Constants.MAX_NETWORK_AGE_MS;
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import com.google.android.maps.mytracks.R;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
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import android.database.ContentObserver;
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import android.hardware.Sensor;
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import android.hardware.SensorEventListener;
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import android.hardware.SensorManager;
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import android.location.Location;
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import android.location.LocationListener;
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import android.location.LocationManager;
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import android.location.LocationProvider;
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import android.net.Uri;
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import android.util.Log;
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import android.widget.Toast;
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/**
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* Real implementation of the data sources, which talks to system services.
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*
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* @author Rodrigo Damazio
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*/
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class TrackDataSourcesImpl implements TrackDataSources {
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// System services
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private final SensorManager sensorManager;
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private final LocationManager locationManager;
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private final ContentResolver contentResolver;
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private final SharedPreferences sharedPreferences;
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private final Context context;
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TrackDataSourcesImpl(Context context, SharedPreferences sharedPreferences) {
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this.context = context;
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this.sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
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this.locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
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this.contentResolver = context.getContentResolver();
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this.sharedPreferences = sharedPreferences;
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}
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@Override
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public void registerOnSharedPreferenceChangeListener(
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OnSharedPreferenceChangeListener listener) {
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sharedPreferences.registerOnSharedPreferenceChangeListener(listener);
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}
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@Override
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public void unregisterOnSharedPreferenceChangeListener(
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OnSharedPreferenceChangeListener listener) {
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sharedPreferences.unregisterOnSharedPreferenceChangeListener(listener);
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}
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@Override
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public void registerContentObserver(Uri contentUri, boolean descendents,
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ContentObserver observer) {
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contentResolver.registerContentObserver(contentUri, descendents, observer);
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}
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@Override
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public void unregisterContentObserver(ContentObserver observer) {
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contentResolver.unregisterContentObserver(observer);
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}
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@Override
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public Sensor getSensor(int type) {
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return sensorManager.getDefaultSensor(type);
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}
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@Override
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public void registerSensorListener(SensorEventListener listener,
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Sensor sensor, int sensorDelay) {
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sensorManager.registerListener(listener, sensor, sensorDelay);
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}
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@Override
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public void unregisterSensorListener(SensorEventListener listener) {
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sensorManager.unregisterListener(listener);
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}
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@Override
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public boolean isLocationProviderEnabled(String provider) {
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return locationManager.isProviderEnabled(provider);
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}
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@Override
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public void requestLocationUpdates(LocationListener listener) {
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// Check if the provider exists.
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LocationProvider gpsProvider = locationManager.getProvider(Constants.GPS_PROVIDER);
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if (gpsProvider == null) {
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listener.onProviderDisabled(Constants.GPS_PROVIDER);
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locationManager.removeUpdates(listener);
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return;
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}
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// Listen to GPS location.
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String providerName = gpsProvider.getName();
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Log.d(Constants.TAG, "TrackDataHub: Using location provider " + providerName);
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locationManager.requestLocationUpdates(providerName,
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0 /*minTime*/, 0 /*minDist*/, listener);
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// Give an initial update on provider state.
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if (locationManager.isProviderEnabled(providerName)) {
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listener.onProviderEnabled(providerName);
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} else {
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listener.onProviderDisabled(providerName);
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}
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// Listen to network location
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try {
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locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
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1000 * 60 * 5 /*minTime*/, 0 /*minDist*/, listener);
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} catch (RuntimeException e) {
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// If anything at all goes wrong with getting a cell location do not
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// abort. Cell location is not essential to this app.
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Log.w(Constants.TAG, "Could not register network location listener.", e);
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}
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}
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@Override
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public Location getLastKnownLocation() {
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// TODO: Let's look at more advanced algorithms to determine the best
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// current location.
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Location loc = locationManager.getLastKnownLocation(Constants.GPS_PROVIDER);
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final long now = System.currentTimeMillis();
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if (loc == null || loc.getTime() < now - MAX_LOCATION_AGE_MS) {
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// We don't have a recent GPS fix, just use cell towers if available
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loc = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
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int toastResId = R.string.status_approximate_location;
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if (loc == null || loc.getTime() < now - MAX_NETWORK_AGE_MS) {
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// We don't have a recent cell tower location, let the user know:
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toastResId = R.string.status_no_location;
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}
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// Let the user know we have only an approximate location:
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Toast.makeText(context, context.getString(toastResId), Toast.LENGTH_LONG).show();
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}
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return loc;
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}
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@Override
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public void removeLocationUpdates(LocationListener listener) {
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locationManager.removeUpdates(listener);
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}
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}
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