Adds Java side of browser GeolocationService.
This commit is contained in:
Steve Block
189
core/java/android/webkit/GeolocationService.java
Executable file
189
core/java/android/webkit/GeolocationService.java
Executable file
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.webkit;
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import android.app.ActivityThread;
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import android.content.Context;
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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.os.Bundle;
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import android.util.Log;
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import android.webkit.WebView;
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import android.webkit.WebViewCore;
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/**
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* Implements the Java side of GeolocationServiceAndroid.
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* @hide Pending API council review.
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*/
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public final class GeolocationService implements LocationListener {
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// Log tag
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private static final String TAG = "geolocationService";
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private long mNativeObject;
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private LocationManager mLocationManager;
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private boolean mIsGpsEnabled;
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private boolean mIsRunning;
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private boolean mIsNetworkProviderAvailable;
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private boolean mIsGpsProviderAvailable;
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/**
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* Constructor
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* @param nativeObject The native object to which this object will report position updates and
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* errors.
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*/
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public GeolocationService(long nativeObject) {
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mNativeObject = nativeObject;
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// Register newLocationAvailable with platform service.
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ActivityThread thread = ActivityThread.systemMain();
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Context context = thread.getApplication();
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mLocationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
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if (mLocationManager == null) {
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Log.e(TAG, "Could not get location manager.");
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}
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}
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/**
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* Start listening for location updates.
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*/
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public void start() {
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registerForLocationUpdates();
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mIsRunning = true;
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}
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/**
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* Stop listening for location updates.
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*/
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public void stop() {
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unregisterFromLocationUpdates();
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mIsRunning = false;
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}
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/**
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* Sets whether to use the GPS.
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* @param enable Whether to use the GPS.
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*/
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public void setEnableGps(boolean enable) {
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if (mIsGpsEnabled != enable) {
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mIsGpsEnabled = enable;
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if (mIsRunning) {
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// There's no way to unregister from a single provider, so we can
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// only unregister from all, then reregister with all but the GPS.
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unregisterFromLocationUpdates();
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registerForLocationUpdates();
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}
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}
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}
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/**
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* LocationListener implementation.
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* Called when the location has changed.
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* @param location The new location, as a Location object.
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*/
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public void onLocationChanged(Location location) {
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// Callbacks from the system location sevice are queued to this thread, so it's possible
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// that we receive callbacks after unregistering. At this point, the native object will no
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// longer exist.
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if (mIsRunning) {
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nativeNewLocationAvailable(mNativeObject, location);
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}
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}
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/**
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* LocationListener implementation.
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* Called when the provider status changes.
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* @param provider The name of the provider.
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* @param status The new status of the provider.
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* @param extras an optional Bundle with provider specific data.
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*/
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public void onStatusChanged(String providerName, int status, Bundle extras) {
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boolean isAvailable = (status == LocationProvider.AVAILABLE);
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if (LocationManager.NETWORK_PROVIDER.equals(providerName)) {
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mIsNetworkProviderAvailable = isAvailable;
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} else if (LocationManager.GPS_PROVIDER.equals(providerName)) {
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mIsGpsProviderAvailable = isAvailable;
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}
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maybeReportError("The last location provider is no longer available");
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}
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/**
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* LocationListener implementation.
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* Called when the provider is enabled.
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* @param provider The name of the location provider that is now enabled.
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*/
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public void onProviderEnabled(String providerName) {
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// No need to notify the native side. It's enough to start sending
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// valid position fixes again.
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if (LocationManager.NETWORK_PROVIDER.equals(providerName)) {
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mIsNetworkProviderAvailable = true;
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} else if (LocationManager.GPS_PROVIDER.equals(providerName)) {
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mIsGpsProviderAvailable = true;
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}
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}
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/**
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* LocationListener implementation.
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* Called when the provider is disabled.
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* @param provider The name of the location provider that is now disabled.
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*/
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public void onProviderDisabled(String providerName) {
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if (LocationManager.NETWORK_PROVIDER.equals(providerName)) {
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mIsNetworkProviderAvailable = false;
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} else if (LocationManager.GPS_PROVIDER.equals(providerName)) {
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mIsGpsProviderAvailable = false;
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}
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maybeReportError("The last location provider was disabled");
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}
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/**
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* Registers this object with the location service.
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*/
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private void registerForLocationUpdates() {
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mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
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mIsNetworkProviderAvailable = true;
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if (mIsGpsEnabled) {
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mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
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mIsGpsProviderAvailable = true;
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}
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}
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/**
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* Unregisters this object from the location service.
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*/
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private void unregisterFromLocationUpdates() {
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mLocationManager.removeUpdates(this);
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}
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/**
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* Reports an error if neither the network nor the GPS provider is available.
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*/
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private void maybeReportError(String message) {
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// Callbacks from the system location sevice are queued to this thread, so it's possible
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// that we receive callbacks after unregistering. At this point, the native object will no
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// longer exist.
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if (mIsRunning && !mIsNetworkProviderAvailable && !mIsGpsProviderAvailable) {
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nativeNewErrorAvailable(mNativeObject, message);
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}
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}
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// Native functions
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private static native void nativeNewLocationAvailable(long nativeObject, Location location);
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private static native void nativeNewErrorAvailable(long nativeObject, String message);
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}
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