LocationProviderAdapter.java revision 1320f92c476a1ad9d19dba2a48c72b75566198e9 
1// Copyright 2013 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.
4
5package org.chromium.content.browser;
6
7import android.content.Context;
8
9import org.chromium.base.CalledByNative;
10import org.chromium.base.ThreadUtils;
11import org.chromium.base.VisibleForTesting;
12
13import java.util.concurrent.FutureTask;
14
15/**
16 * Implements the Java side of LocationProviderAndroid.
17 * Delegates all real functionality to the implementation
18 * returned from LocationProviderFactory.
19 * See detailed documentation on
20 * content/browser/geolocation/android_location_api_adapter.h.
21 * Based on android.webkit.GeolocationService.java
22 */
23@VisibleForTesting
24public class LocationProviderAdapter {
25
26    // Delegate handling the real work in the main thread.
27    private LocationProviderFactory.LocationProvider mImpl;
28
29    private LocationProviderAdapter(Context context) {
30        mImpl = LocationProviderFactory.get(context);
31    }
32
33    @CalledByNative
34    static LocationProviderAdapter create(Context context) {
35        return new LocationProviderAdapter(context);
36    }
37
38    /**
39     * Start listening for location updates until we're told to quit. May be
40     * called in any thread.
41     * @param gpsEnabled Whether or not we're interested in high accuracy GPS.
42     */
43    @CalledByNative
44    public boolean start(final boolean gpsEnabled) {
45        FutureTask<Void> task = new FutureTask<Void>(new Runnable() {
46            @Override
47            public void run() {
48                mImpl.start(gpsEnabled);
49            }
50        }, null);
51        ThreadUtils.runOnUiThread(task);
52        return true;
53    }
54
55    /**
56     * Stop listening for location updates. May be called in any thread.
57     */
58    @CalledByNative
59    public void stop() {
60        FutureTask<Void> task = new FutureTask<Void>(new Runnable() {
61            @Override
62            public void run() {
63                mImpl.stop();
64            }
65        }, null);
66        ThreadUtils.runOnUiThread(task);
67    }
68
69    /**
70     * Returns true if we are currently listening for location updates, false if not.
71     * Must be called only in the UI thread.
72     */
73    public boolean isRunning() {
74        assert ThreadUtils.runningOnUiThread();
75        return mImpl.isRunning();
76    }
77
78    public static void newLocationAvailable(double latitude, double longitude, double timestamp,
79            boolean hasAltitude, double altitude,
80            boolean hasAccuracy, double accuracy,
81            boolean hasHeading, double heading,
82            boolean hasSpeed, double speed) {
83        nativeNewLocationAvailable(latitude, longitude, timestamp, hasAltitude, altitude,
84                hasAccuracy, accuracy, hasHeading, heading, hasSpeed, speed);
85    }
86
87    public static void newErrorAvailable(String message) {
88        nativeNewErrorAvailable(message);
89    }
90
91    // Native functions
92    private static native void nativeNewLocationAvailable(
93            double latitude, double longitude, double timeStamp,
94            boolean hasAltitude, double altitude,
95            boolean hasAccuracy, double accuracy,
96            boolean hasHeading, double heading,
97            boolean hasSpeed, double speed);
98    private static native void nativeNewErrorAvailable(String message);
99}
100