1page.title=Location and Maps 2@jd:body 3 4<div id="qv-wrapper"> 5<div id="qv"> 6 7 <h2>Location and Maps quickview</h2> 8 <ul> 9 <li>Android provides a location framework that your application can use to determine the device's location and bearing and register for updates.</li> 10 <li>A Google Maps external library is available that lets you display and manage Maps data.</li> 11 </ul> 12 <h2>In this document</h2> 13 <ol> 14 <li><a href="#location">Location Services</a></li> 15 <li><a href="#maps">Google Maps External Library</a></li> 16 </ol> 17 <h2>See Also</h2> 18 <ol> 19 <li><a href="http://code.google.com/android/add-ons/google-apis/index.html">Google APIs add-on download»</a></li> 20 </ol> 21</div> 22</div> 23 24<p>Location- and maps-based applications and services are compelling for mobile device users. You can build these capabilities into your applications using the classes of the {@link android.location} package and the Google Maps external library. The sections below provide details. </p> 25 26<h2 id="location">Location Services</h2> 27 28<p>Android gives your applications access to the location services supported by 29the device through the classes in the <code>android.location</code> package. The 30central component of the location framework is the 31{@link android.location.LocationManager} system service, which provides an API to 32determine location and bearing if the underlying device (if it supports location 33capabilities). </p> 34 35<p>As with other system services, you do not instantiate a LocationManager directly. 36Rather, you request an LocationManager instance from the system by calling 37{@link android.content.Context#getSystemService(String) getSystemService(Context.LOCATION_SERVICE)}. 38The method returns a handle to a new LocationManager instance.</p> 39 40<p>Once your application has a handle to a LocationManager instance, your application 41will be able to do three things:</p> 42 43<ul> 44 <li>Query for the list of all LocationProviders known to the 45 LocationManager for its last known location.</li> 46 <li>Register/unregister for periodic updates of current location from a 47 LocationProvider (specified either by Criteria or name).</li> 48 <li>Register/unregister for a given Intent to be fired if the device comes 49 within a given proximity (specified by radius in meters) of a given 50 lat/long.</li> 51</ul> 52 53<p>However, during initial development in the emulator, you may not have access to real 54data from a real location provider (Network or GPS). In that case, it may be necessary to 55spoof some data for your application using a mock location provider.</p> 56 57<p class="note"><strong>Note:</strong> If you've used mock LocationProviders in 58previous versions of the SDK, you can no longer provide canned LocationProviders 59in the /system/etc/location directory. These directories will be wiped during boot-up. 60Please follow the new procedures outlined below.</p> 61 62<h3>Providing Mock Location Data</h3> 63 64<p>When testing your application on the Android emulator, there are a couple different 65ways to send it some mock location data: you can use the DDMS tool or the "geo" command 66option in the emulator console.</p> 67 68<h4 id="ddms">Using DDMS</h4> 69<p>With the DDMS tool, you can simulate location data a few different ways:</p> 70<ul> 71 <li>Manually send individual longitude/latitude coordinates to the device.</li> 72 <li>Use a GPX file describing a route for playback to the device.</li> 73 <li>Use a KML file describing individual placemarks for sequenced playback to the device.</li> 74</ul> 75<p>For more information on using DDMS to spoof location data, see the 76<a href="{@docRoot}guide/developing/tools/ddms.html#emulator-control">Using DDMS guide</a>. 77 78<h4 id="geo">Using the "geo" command in the emulator console</h4> 79<p>Launch your application in the Android emulator and open a terminal/console in 80your SDK's <code>/tools</code> directory. Connect to the emulator console. Now you can use:</p> 81<ul><li><code>geo fix</code> to send a fixed geo-location. 82 <p>This command accepts a longitude and latitude in decimal degrees, and 83 an optional altitude in meters. For example:</p> 84 <pre>geo fix -121.45356 46.51119 4392</pre> 85 </li> 86 <li><code>geo nmea</code> to send an NMEA 0183 sentence. 87 <p>This command accepts a single NMEA sentence of type '$GPGGA' (fix data) or '$GPRMC' (transit data). 88 For example:</p> 89 <pre>geo nmea $GPRMC,081836,A,3751.65,S,14507.36,E,000.0,360.0,130998,011.3,E*62</pre> 90 </li> 91</ul> 92 93<p>For information about how to connect to the emulator console, see 94<a href="{@docRoot}guide/developing/tools/emulator.html#console">Using the Emulator Console</a>.</p> 95 96<h2 id="maps">Google Maps External Library</h2> 97 98<p>To make it easier for you to add powerful mapping capabilities to your 99application, Google provides a Maps external library that includes the 100com.google.android.maps package. The classes of the com.google.android.maps 101package offer built-in downloading, rendering, and caching of Maps tiles, as 102well as a variety of display options and controls. </p> 103 104<p>The key class in the Maps package is 105<code>com.google.android.maps.MapView</code>, a subclass of 106{@link android.view.ViewGroup ViewGroup}. A MapView displays a map with data obtained 107from the Google Maps service. When the MapView has focus, it will capture 108keypresses and touch gestures to pan and zoom the map automatically, including 109handling network requests for additional maps tiles. It also provides all of the 110UI elements necessary for users to control the map. Your application can also 111use MapView class methods to control the MapView programmatically and draw a 112number of Overlay types on top of the map. </p> 113 114<p>In general, the MapView class provides a wrapper around the Google Maps API 115that lets your application manipulate Google Maps data through class methods, 116and it lets you work with Maps data as you would other types of Views.</p> 117 118<p>The Maps external library is not part of the standard Android library, so it 119may not be present on some compliant Android-powered devices. Similarly, the 120Maps external library is not included in the standard Android library provided 121in the SDK. So that you can develop using the classes of the 122com.google.android.maps package, the Maps external library is made available to 123you as part of the Google APIs add-on for the Android SDK. </p> 124 125<p>To learn more about the Maps external library and how to download and use the 126Google APIs add-on, visit</p> 127 128<p style="margin-left:2em;"><a 129href="http://code.google.com/android/add-ons/google-apis">http://code.google.com/android/add-ons/google-apis</a></p> 130 131<p>For your convenience, the Google APIs add-on is also included in the Android 132SDK. <!-- To learn now to use the Maps external library in your application, see 133[[Using External Libraries]].--></p> 134 135<p class="note"><strong>Note:</strong> In order to display Google Maps data in a 136MapView, you must register with the Google Maps service and obtain a Maps API 137Key. For information about how to get a Maps API Key, see <a 138href="http://code.google.com/android/add-ons/google-apis/mapkey.html">Obtaining 139a Maps API Key</a>.</p> 140 141