1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 package org.chromium.content.browser;
7 import android.content.Context;
8 import android.location.Criteria;
9 import android.location.Location;
10 import android.location.LocationListener;
11 import android.location.LocationManager;
12 import android.os.Bundle;
13 import android.util.Log;
15 import org.chromium.base.ActivityStatus;
16 import org.chromium.base.CalledByNative;
17 import org.chromium.base.ThreadUtils;
19 import java.util.List;
20 import java.util.concurrent.FutureTask;
23 * Implements the Java side of LocationProviderAndroid.
24 * Delegates all real functionality to the inner class.
25 * See detailed documentation on
26 * content/browser/geolocation/android_location_api_adapter.h.
27 * Based on android.webkit.GeolocationService.java
29 class LocationProvider {
32 private static final String TAG = "LocationProvider";
35 * This is the core of android location provider. It is a separate class for clarity
36 * so that it can manage all processing completely in the UI thread. The container class
37 * ensures that the start/stop calls into this class are done in the UI thread.
39 private static class LocationProviderImpl
40 implements LocationListener, ActivityStatus.StateListener {
42 private Context mContext;
43 private LocationManager mLocationManager;
44 private boolean mIsRunning;
45 private boolean mShouldRunAfterActivityResume;
46 private boolean mIsGpsEnabled;
48 LocationProviderImpl(Context context) {
53 public void onActivityStateChange(int state) {
54 if (state == ActivityStatus.PAUSED) {
55 mShouldRunAfterActivityResume |= mIsRunning;
56 unregisterFromLocationUpdates();
57 } else if (state == ActivityStatus.RESUMED) {
59 if (mShouldRunAfterActivityResume) {
60 registerForLocationUpdates();
66 * Start listening for location updates.
67 * @param gpsEnabled Whether or not we're interested in high accuracy GPS.
69 private void start(boolean gpsEnabled) {
70 if (!mIsRunning && !mShouldRunAfterActivityResume) {
71 // Currently idle so start listening to activity status changes.
72 ActivityStatus.registerStateListener(this);
74 mIsGpsEnabled = gpsEnabled;
76 if (ActivityStatus.getState() != ActivityStatus.RESUMED) {
77 mShouldRunAfterActivityResume = true;
79 unregisterFromLocationUpdates();
80 registerForLocationUpdates();
85 * Stop listening for location updates.
88 unregisterFromLocationUpdates();
89 ActivityStatus.unregisterStateListener(this);
90 mShouldRunAfterActivityResume = false;
94 * Returns true if we are currently listening for location updates, false if not.
96 private boolean isRunning() {
101 public void onLocationChanged(Location location) {
102 // Callbacks from the system location sevice are queued to this thread, so it's
103 // possible that we receive callbacks after unregistering. At this point, the
104 // native object will no longer exist.
106 updateNewLocation(location);
110 private void updateNewLocation(Location location) {
111 nativeNewLocationAvailable(location.getLatitude(), location.getLongitude(),
112 location.getTime() / 1000.0,
113 location.hasAltitude(), location.getAltitude(),
114 location.hasAccuracy(), location.getAccuracy(),
115 location.hasBearing(), location.getBearing(),
116 location.hasSpeed(), location.getSpeed());
120 public void onStatusChanged(String provider, int status, Bundle extras) {
124 public void onProviderEnabled(String provider) {
128 public void onProviderDisabled(String provider) {
131 private void ensureLocationManagerCreated() {
132 if (mLocationManager != null) return;
133 mLocationManager = (LocationManager) mContext.getSystemService(
134 Context.LOCATION_SERVICE);
135 if (mLocationManager == null) {
136 Log.e(TAG, "Could not get location manager.");
141 * Registers this object with the location service.
143 private void registerForLocationUpdates() {
144 ensureLocationManagerCreated();
145 if (usePassiveOneShotLocation()) return;
150 // We're running on the main thread. The C++ side is responsible to
151 // bounce notifications to the Geolocation thread as they arrive in the mainLooper.
153 Criteria criteria = new Criteria();
154 mLocationManager.requestLocationUpdates(0, 0, criteria, this,
155 ThreadUtils.getUiThreadLooper());
157 criteria.setAccuracy(Criteria.ACCURACY_FINE);
158 mLocationManager.requestLocationUpdates(0, 0, criteria, this,
159 ThreadUtils.getUiThreadLooper());
161 } catch(SecurityException e) {
162 Log.e(TAG, "Caught security exception registering for location updates from " +
163 "system. This should only happen in DumpRenderTree.");
164 } catch(IllegalArgumentException e) {
165 Log.e(TAG, "Caught IllegalArgumentException registering for location updates.");
170 * Unregisters this object from the location service.
172 private void unregisterFromLocationUpdates() {
175 mLocationManager.removeUpdates(this);
179 private boolean usePassiveOneShotLocation() {
180 if (!isOnlyPassiveLocationProviderEnabled()) return false;
182 // Do not request a location update if the only available location provider is
183 // the passive one. Make use of the last known location and call
184 // onLocationChanged directly.
185 final Location location = mLocationManager.getLastKnownLocation(
186 LocationManager.PASSIVE_PROVIDER);
187 if (location != null) {
188 ThreadUtils.runOnUiThread(new Runnable() {
191 updateNewLocation(location);
199 * Checks if the passive location provider is the only provider available
202 private boolean isOnlyPassiveLocationProviderEnabled() {
203 List<String> providers = mLocationManager.getProviders(true);
204 return providers != null && providers.size() == 1
205 && providers.get(0).equals(LocationManager.PASSIVE_PROVIDER);
209 // Delegate handling the real work in the main thread.
210 private LocationProviderImpl mImpl;
212 private LocationProvider(Context context) {
213 mImpl = new LocationProviderImpl(context);
217 static LocationProvider create(Context context) {
218 return new LocationProvider(context);
222 * Start listening for location updates until we're told to quit. May be
223 * called in any thread.
224 * @param gpsEnabled Whether or not we're interested in high accuracy GPS.
227 public boolean start(final boolean gpsEnabled) {
228 FutureTask<Void> task = new FutureTask<Void>(new Runnable() {
231 mImpl.start(gpsEnabled);
234 ThreadUtils.runOnUiThread(task);
239 * Stop listening for location updates. May be called in any thread.
243 FutureTask<Void> task = new FutureTask<Void>(new Runnable() {
249 ThreadUtils.runOnUiThread(task);
253 * Returns true if we are currently listening for location updates, false if not.
254 * Must be called only in the UI thread.
256 public boolean isRunning() {
257 assert ThreadUtils.runningOnUiThread();
258 return mImpl.isRunning();
262 public static native void nativeNewLocationAvailable(
263 double latitude, double longitude, double timeStamp,
264 boolean hasAltitude, double altitude,
265 boolean hasAccuracy, double accuracy,
266 boolean hasHeading, double heading,
267 boolean hasSpeed, double speed);
268 public static native void nativeNewErrorAvailable(String message);