docs: Updates the request-location-updates lesson in the location APIs training course.

Uses GoogleApiClient to connect to Play services.
Uses the latest Fused Location Provider API.
Updates the entire tutorial and code sample for clarity and correctness.

Bug: 17109822
Change-Id: I42cc36f861d0455ef9c07b793c64038c572a6e8a

1 files changed, 374 insertions, 569 deletions

diff --git a/docs/html/training/location/receive-location-updates.jd b/docs/html/training/location/receive-location-updates.jd
index e6e8c51..208dc17 100644
--- a/docs/html/training/location/receive-location-updates.jd
+++ b/docs/html/training/location/receive-location-updates.jd
@@ -1,612 +1,417 @@
 page.title=Receiving Location Updates
 trainingnavtop=true
 @jd:body
+
 <div id="tb-wrapper">
-<div id="tb">
-
-<h2>This lesson teaches you to</h2>
-<ol>
-    <li><a href="#Permissions">Request Location Permission</a></li>
-    <li><a href="#PlayServices">Check for Google Play Services</a></li>
-    <li><a href="#DefineCallbacks">Define Location Services Callbacks</a></li>
-    <li><a href="#UpdateParameters">Specify Update Parameters</a></li>
-    <li><a href="#StartUpdates">Start Location Updates</a></li>
-    <li><a href="#StopUpdates">Stop Location Updates</a></li>
-</ol>
-
-<h2>You should also read</h2>
-<ul>
+  <div id="tb">
+
+  <h2>This lesson teaches you how to</h2>
+  <ol>
+    <li><a href="#connect">Connect to Location Services</a></li>
+    <li><a href="#location-request">Set Up a Location Request</a></li>
+    <li><a href="#updates">Request Location Updates</a></li>
+    <li><a href="#callback">Define the Location Update Callback</a></li>
+    <li><a href="#stop-updates">Stop Location Updates</a></li>
+    <li><a href="#save-state">Save the State of the Activity</a></li>
+  </ol>
+
+  <h2>You should also read</h2>
+  <ul>
     <li>
-        <a href="{@docRoot}google/play-services/setup.html">Setup Google Play Services SDK</a>
+      <a href="{@docRoot}google/play-services/setup.html">Setting up Google Play
+      Services</a>
     </li>
     <li>
-        <a href="retrieve-current.html">Retrieving the Current Location</a>
+      <a href="retrieve-current.html">Getting the Last Known Location</a>
     </li>
- </ul>
+   </ul>
 
-<h2>Try it out</h2>
+  <h2>Try it out</h2>
 
-<div class="download-box">
-  <a href="http://developer.android.com/shareables/training/LocationUpdates.zip" class="button">Download the sample</a>
-  <p class="filename">LocationUpdates.zip</p>
+    <ul>
+      <li>
+        <a href="https://github.com/googlesamples/android-play-location/tree/master/LocationUpdates" class="external-link">LocationUpdates</a>
+      </li>
+    </ul>
+  </div>
 </div>
 
-</div>
-</div>
+<p>If your app can continuously track location, it can deliver more relevant
+  information to the user. For example, if your app helps the user find their
+  way while walking or driving, or if your app tracks the location of assets, it
+  needs to get the location of the device at regular intervals. As well as the
+  geographical location (latitude and longitude), you may want to give the user
+  further information such as the bearing (horizontal direction of travel),
+  altitude, or velocity of the device. This information, and more, is available
+  in the {@link android.location.Location} object that your app can retrieve
+  from the
+  <a href="{@docRoot}reference/com/google/android/gms/location/FusedLocationProviderApi.html">fused
+  location provider</a>.</p>
+
+<p>While you can get a device's location with
+  <a href="{@docRoot}reference/com/google/android/gms/location/FusedLocationProviderApi.html#getLastLocation(com.google.android.gms.common.api.GoogleApiClient)">{@code getLastLocation()}</a>,
+  as illustrated in the lesson on
+  <a href="retrieve-current.html">Getting the Last Known Location</a>,
+  a more direct approach is to request periodic updates from the fused location
+  provider. In response, the API updates your app periodically with the best
+  available location, based on the currently-available location providers such
+  as WiFi and GPS (Global Positioning System). The accuracy of the location is
+  determined by the providers, the location permissions you've requested, and
+  the options you set in the location request.</p>
+
+<p>This lesson shows you how to request regular updates about a device's
+  location using the
+  <a href="{@docRoot}reference/com/google/android/gms/location/FusedLocationProviderApi.html#requestLocationUpdates(com.google.android.gms.common.api.GoogleApiClient, com.google.android.gms.location.LocationRequest, com.google.android.gms.location.LocationListener)">{@code requestLocationUpdates()}</a>
+  method in the fused location provider.
+
+<h2 id="connect">Connect to Location Services</h2>
+
+<p>Location services for apps are provided through Google Play services and the
+  fused location provider. In order to use these services, you connect your app
+  using the Google API Client and then request location updates. For details on
+  connecting with the
+  <a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.html">{@code GoogleApiClient}</a>,
+  follow the instructions in
+  <a href="retrieve-current.html">Getting the Last Known Location</a>, including
+  requesting the current location.</p>
+
+<p>The last known location of the device provides a handy base from which to
+  start, ensuring that the app has a known location before starting the
+  periodic location updates. The lesson on
+  <a href="retrieve-current.html">Getting the Last Known Location</a> shows you
+  how to get the last known location by calling
+  <a href="{@docRoot}reference/com/google/android/gms/location/FusedLocationProviderApi.html#getLastLocation(com.google.android.gms.common.api.GoogleApiClient)">{@code getLastLocation()}</a>.
+  The snippets in the following sections assume that your app has already
+  retrieved the last known location and stored it as a
+  {@link android.location.Location} object in the global variable
+  {@code mCurrentLocation}.</p>
+
+<p>Apps that use location services must request location permissions. In this
+  lesson you require fine location detection, so that your app can get as
+  precise a location as possible from the available location providers. Request
+  this permission with the
+  {@code uses-permission} element in your app manifest, as shown in the
+  following example:</p>
 
-<p>
-    If your app does navigation or tracking, you probably want to get the user's
-    location at regular intervals. While you can do this with
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationClient.html#getLastLocation()">LocationClient.getLastLocation()</a></code>,
-    a more direct approach is to request periodic updates from Location Services. In
-    response, Location Services automatically updates your app with the best available location,
-    based on the currently-available location providers such as WiFi and GPS.
-</p>
-<p>
-    To get periodic location updates from Location Services, you send a request using a location
-    client. Depending on the form of the request, Location Services either invokes a callback
-    method and passes in a {@link android.location.Location} object, or issues an
-    {@link android.content.Intent} that contains the location in its extended data. The accuracy and
-    frequency of the updates are affected by the location permissions you've requested and the
-    parameters you pass to Location Services with the request.
-</p>
-<!-- Request permission -->
-<h2 id="Permissions">Specify App Permissions</h2>
-<p>
-    Apps that use Location Services must request location permissions. Android has two location
-    permissions, {@link android.Manifest.permission#ACCESS_COARSE_LOCATION ACCESS_COARSE_LOCATION}
-    and {@link android.Manifest.permission#ACCESS_FINE_LOCATION ACCESS_FINE_LOCATION}. The
-    permission you choose affects the accuracy of the location updates you receive.
-    For example, If you request only coarse location permission, Location Services obfuscates the
-    updated location to an accuracy that's roughly equivalent to a city block.
-</p>
-<p>
-    Requesting {@link android.Manifest.permission#ACCESS_FINE_LOCATION ACCESS_FINE_LOCATION} implies
-    a request for {@link android.Manifest.permission#ACCESS_COARSE_LOCATION ACCESS_COARSE_LOCATION}.
-</p>
-<p>
-    For example, to add the coarse location permission to your manifest, insert the following as a
-    child element of
-    the
-<code><a href="{@docRoot}guide/topics/manifest/manifest-element.html">&lt;manifest&gt;</a></code>
-    element:
-</p>
 <pre>
-&lt;uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/&gt;
+&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.google.android.gms.location.sample.locationupdates" &gt;
+
+  &lt;uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/&gt;
+&lt;/manifest&gt;
 </pre>
-<!-- Check for Google Play services -->
-<h2 id="PlayServices">Check for Google Play Services</h2>
-<p>
-    Location Services is part of the Google Play services APK. Since it's hard to anticipate the
-    state of the user's device, you should always check that the APK is installed before you attempt
-    to connect to Location Services. To check that the APK is installed, call
-<code><a href="{@docRoot}reference/com/google/android/gms/common/GooglePlayServicesUtil.html#isGooglePlayServicesAvailable(android.content.Context)">GooglePlayServicesUtil.isGooglePlayServicesAvailable()</a></code>,
-    which returns one of the
-    integer result codes listed in the API reference documentation. If you encounter an error,
-    call
-<code><a href="{@docRoot}reference/com/google/android/gms/common/GooglePlayServicesUtil.html#getErrorDialog(int, android.app.Activity, int)">GooglePlayServicesUtil.getErrorDialog()</a></code>
-    to retrieve localized dialog that prompts users to take the correct action, then display
-    the dialog in a {@link android.support.v4.app.DialogFragment}. The dialog may allow the
-    user to correct the problem, in which case Google Play services may send a result back to your
-    activity. To handle this result, override the method
-    {@link android.support.v4.app.FragmentActivity#onActivityResult onActivityResult()}
-
-</p>
-<p class="note">
-    <strong>Note:</strong> To make your app compatible with
-    platform version 1.6 and later, the activity that displays the
-    {@link android.support.v4.app.DialogFragment} must subclass
-    {@link android.support.v4.app.FragmentActivity} instead of {@link android.app.Activity}. Using
-    {@link android.support.v4.app.FragmentActivity} also allows you to call
-    {@link android.support.v4.app.FragmentActivity#getSupportFragmentManager
-    getSupportFragmentManager()} to display the {@link android.support.v4.app.DialogFragment}.
-</p>
-<p>
-    Since you usually need to check for Google Play services in more than one place in your code,
-    define a method that encapsulates the check, then call the method before each connection
-    attempt. The following snippet contains all of the code required to check for Google
-    Play services:
-</p>
+
+<h2 id="location-request">Set Up a Location Request</h2>
+
+<p>To store parameters for requests to the fused location provider, create a
+  <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html">{@code LocationRequest}</a>.
+  The parameters determine the levels of accuracy requested. For details of all
+  the options available in the location request, see the
+  <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html">{@code LocationRequest}</a>
+  class reference. This lesson sets the update interval, fastest update
+  interval, and priority, as described below:</p>
+
+<dl>
+  <dt>
+    Update interval
+  </dt>
+  <dd>
+    <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setInterval(long)">{@code setInterval()}</a>
+    - This method sets the rate in milliseconds at which your app prefers to
+    receive location updates. Note that the location updates may be faster than
+    this rate if another app is receiving updates at a faster rate, or slower
+    than this rate, or there may be no updates at all (if the device has no
+    connectivity, for example).
+  </dd>
+  <dt>
+    Fastest update interval
+  </dt>
+  <dd>
+    <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setFastestInterval(long)">{@code setFastestInterval()}</a>
+    - This method sets the <strong>fastest</strong> rate in milliseconds at which
+    your app can handle location updates. You need to set this rate because
+    other apps also affect the rate at which updates are sent. The Google Play
+    services location APIs send out updates at the fastest rate that any app
+    has requested with
+    <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setInterval(long)">{@code setInterval()}</a>.
+    If this rate is faster
+    than your app can handle, you may encounter problems with UI flicker or data
+    overflow. To prevent this, call
+    <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setFastestInterval(long)">{@code setFastestInterval()}</a>
+    to set an upper limit to the update rate.
+  </dd>
+  <dt>Priority</dt>
+  <dd>
+    <p>
+      <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setPriority(int)">{@code setPriority()}</a>
+      - This method sets the priority of the request, which gives the Google Play
+      services location services a strong hint about which location sources to use.
+      The following values are supported:</p>
+      <ul>
+        <li>
+          <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#PRIORITY_BALANCED_POWER_ACCURACY">{@code PRIORITY_BALANCED_POWER_ACCURACY}</a>
+          - Use this setting to request location precision to within a city
+          block, which is an accuracy of approximately 100 meters. This is
+          considered a coarse level of accuracy, and is likely to consume less
+          power. With this setting, the location services are likely to use WiFi
+          and cell tower positioning. Note, however, that the choice of location
+          provider depends on many other factors, such as which sources are
+          available.</li>
+        <li>
+          <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#PRIORITY_HIGH_ACCURACY">{@code PRIORITY_HIGH_ACCURACY}</a>
+          - Use this setting to request the most precise location possible. With
+          this setting, the location services are more likely to use GPS
+          (Global Positioning System) to determine the location.</li>
+        <li><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#PRIORITY_LOW_POWER">{@code PRIORITY_LOW_POWER}</a>
+          - Use this setting to request city-level precision, which is
+          an accuracy of approximately 10 kilometers. This is considered a
+          coarse level of accuracy, and is likely to consume less power.</li>
+        <li><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#PRIORITY_NO_POWER">{@code PRIORITY_NO_POWER}</a>
+          - Use this setting if you need negligible impact on power consumption,
+          but want to receive location updates when available. With this
+          setting, your app does not trigger any location updates, but
+          receives locations triggered by other apps.</li>
+      </ul>
+  </dd>
+</dl>
+
+<p>Create the location request and set the parameters as shown in this
+  code sample:</p>
+
 <pre>
-public class MainActivity extends FragmentActivity {
-    ...
-    // Global constants
-    /*
-     * Define a request code to send to Google Play services
-     * This code is returned in Activity.onActivityResult
-     */
-    private final static int
-            CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
-    ...
-    // Define a DialogFragment that displays the error dialog
-    public static class ErrorDialogFragment extends DialogFragment {
-        // Global field to contain the error dialog
-        private Dialog mDialog;
-        // Default constructor. Sets the dialog field to null
-        public ErrorDialogFragment() {
-            super();
-            mDialog = null;
-        }
-        // Set the dialog to display
-        public void setDialog(Dialog dialog) {
-            mDialog = dialog;
-        }
-        // Return a Dialog to the DialogFragment.
-        &#64;Override
-        public Dialog onCreateDialog(Bundle savedInstanceState) {
-            return mDialog;
-        }
-    }
-    ...
-    /*
-     * Handle results returned to the FragmentActivity
-     * by Google Play services
-     */
-    &#64;Override
-    protected void onActivityResult(
-            int requestCode, int resultCode, Intent data) {
-        // Decide what to do based on the original request code
-        switch (requestCode) {
-            ...
-            case CONNECTION_FAILURE_RESOLUTION_REQUEST :
-            /*
-             * If the result code is Activity.RESULT_OK, try
-             * to connect again
-             */
-                switch (resultCode) {
-                    case Activity.RESULT_OK :
-                    /*
-                     * Try the request again
-                     */
-                    ...
-                    break;
-                }
-            ...
-        }
-        ...
-    }
-    ...
-    private boolean servicesConnected() {
-        // Check that Google Play services is available
-        int resultCode =
-                GooglePlayServicesUtil.
-                        isGooglePlayServicesAvailable(this);
-        // If Google Play services is available
-        if (ConnectionResult.SUCCESS == resultCode) {
-            // In debug mode, log the status
-            Log.d("Location Updates",
-                    "Google Play services is available.");
-            // Continue
-            return true;
-        // Google Play services was not available for some reason
-        } else {
-            // Get the error code
-            int errorCode = connectionResult.getErrorCode();
-            // Get the error dialog from Google Play services
-            Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog(
-                    errorCode,
-                    this,
-                    CONNECTION_FAILURE_RESOLUTION_REQUEST);
-            // If Google Play services can provide an error dialog
-            if (errorDialog != null) {
-                // Create a new DialogFragment for the error dialog
-                ErrorDialogFragment errorFragment =
-                        new ErrorDialogFragment();
-                // Set the dialog in the DialogFragment
-                errorFragment.setDialog(errorDialog);
-                // Show the error dialog in the DialogFragment
-                errorFragment.show(
-                        getSupportFragmentManager(),
-                        "Location Updates");
-            }
-        }
-    }
-    ...
+protected void createLocationRequest() {
+    LocationRequest mLocationRequest = new LocationRequest();
+    mLocationRequest.setInterval(10000);
+    mLocationRequest.setFastestInterval(5000);
+    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
 }
 </pre>
-<p>
-    Snippets in the following sections call this method to verify that Google Play services is
-    available.
-</p>
-<!--
-    Define Location Services Callbacks
- -->
-<h2 id="DefineCallbacks">Define Location Services Callbacks</h2>
-<p>
-    Before you request location updates, you must first implement the interfaces that Location
-    Services uses to communicate connection status to your app:
-</p>
-<dl>
-    <dt>
-<code><a href="{@docRoot}reference/com/google/android/gms/common/GooglePlayServicesClient.ConnectionCallbacks.html">ConnectionCallbacks</a></code>
-    </dt>
-    <dd>
-        Specifies methods that Location Services calls when a location client is connected or
-        disconnected.
-    </dd>
-    <dt>
-<code><a href="{@docRoot}reference/com/google/android/gms/common/GooglePlayServicesClient.OnConnectionFailedListener.html">OnConnectionFailedListener</a></code>
-    </dt>
-    <dd>
-        Specifies a method that Location Services calls if an error occurs while attempting to
-        connect the location client. This method uses the previously-defined {@code showErrorDialog}
-        method to display an error dialog that attempts to fix the problem using Google Play
-        services.
-    </dd>
-</dl>
-<p>
-    The following snippet shows how to specify the interfaces and define the methods:
-</p>
+
+<p>The priority of
+  <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#PRIORITY_HIGH_ACCURACY">{@code PRIORITY_HIGH_ACCURACY}</a>,
+  combined with the
+  {@link android.Manifest.permission#ACCESS_FINE_LOCATION ACCESS_FINE_LOCATION}
+  permission setting that you've defined in the app manifest, and a fast update
+  interval of 5000 milliseconds (5 seconds), causes the fused location
+  provider to return location updates that are accurate to within a few feet.
+  This approach is appropriate for mapping apps that display the location in
+  real time.</p>
+
+<p class="note"><strong>Performance hint:</strong> If your app accesses the
+  network or does other long-running work after receiving a location update,
+  adjust the fastest interval to a slower value. This adjustment prevents your
+  app from receiving updates it can't use. Once the long-running work is done,
+  set the fastest interval back to a fast value.</p>
+
+<h2 id="updates">Request Location Updates</h2>
+
+<p>Now that you've set up a location request containing your app's requirements
+  for the location updates, you can start the regular updates by calling
+  <a href="{@docRoot}reference/com/google/android/gms/location/FusedLocationProviderApi.html#requestLocationUpdates(com.google.android.gms.common.api.GoogleApiClient, com.google.android.gms.location.LocationRequest, com.google.android.gms.location.LocationListener)">{@code requestLocationUpdates()}</a>.
+  Do this in the
+  <a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.ConnectionCallbacks.html#onConnected(android.os.Bundle)">{@code onConnected()}</a>
+  callback provided by Google API Client, which is called when the client is
+  ready.</p>
+
+<p>Depending on the form of the request, the fused location provider either
+  invokes the
+  <a href="{@docRoot}reference/com/google/android/gms/location/LocationListener.html">{@code LocationListener.onLocationChanged()}</a>
+  callback method and passes it a {@link android.location.Location} object, or
+  issues a
+  <a href="{@docRoot}reference/android/app/PendingIntent.html">{@code PendingIntent}</a>
+  that contains the location in its extended data. The accuracy and frequency of
+  the updates are affected by the location permissions you've requested and the
+  options you set in the location request object.</p>
+
+<p>This lesson shows you how to get the update using the
+  <a href="{@docRoot}reference/com/google/android/gms/location/LocationListener.html">{@code LocationListener}</a>
+  callback approach. Call
+  <a href="{@docRoot}reference/com/google/android/gms/location/FusedLocationProviderApi.html#requestLocationUpdates(com.google.android.gms.common.api.GoogleApiClient, com.google.android.gms.location.LocationRequest, com.google.android.gms.location.LocationListener)">{@code requestLocationUpdates()}</a>,
+  passing it your instance of the
+  <a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.html">{@code GoogleApiClient}</a>,
+  the
+  <a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html">{@code LocationRequest}</a>
+  object,
+  and a <a href="{@docRoot}reference/com/google/android/gms/location/LocationListener.html">{@code LocationListener}</a>.
+  Define a {@code startLocationUpdates()} method, called from the
+  <a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.ConnectionCallbacks.html#onConnected(android.os.Bundle)">{@code onConnected()}</a>
+  callback, as shown in the following code sample:</p>
+
 <pre>
-public class MainActivity extends FragmentActivity implements
-        GooglePlayServicesClient.ConnectionCallbacks,
-        GooglePlayServicesClient.OnConnectionFailedListener {
+&#64;Override
+public void onConnected(Bundle connectionHint) {
     ...
-    /*
-     * Called by Location Services when the request to connect the
-     * client finishes successfully. At this point, you can
-     * request the current location or start periodic updates
-     */
-    &#64;Override
-    public void onConnected(Bundle dataBundle) {
-        // Display the connection status
-        Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
+    if (mRequestingLocationUpdates) {
+        startLocationUpdates();
     }
-    ...
-    /*
-     * Called by Location Services if the connection to the
-     * location client drops because of an error.
-     */
-    &#64;Override
-    public void onDisconnected() {
-        // Display the connection status
-        Toast.makeText(this, "Disconnected. Please re-connect.",
-                Toast.LENGTH_SHORT).show();
-    }
-    ...
-    /*
-     * Called by Location Services if the attempt to
-     * Location Services fails.
-     */
-    &#64;Override
-    public void onConnectionFailed(ConnectionResult connectionResult) {
-        /*
-         * Google Play services can resolve some errors it detects.
-         * If the error has a resolution, try sending an Intent to
-         * start a Google Play services activity that can resolve
-         * error.
-         */
-        if (connectionResult.hasResolution()) {
-            try {
-                // Start an Activity that tries to resolve the error
-                connectionResult.startResolutionForResult(
-                        this,
-                        CONNECTION_FAILURE_RESOLUTION_REQUEST);
-                /*
-                * Thrown if Google Play services canceled the original
-                * PendingIntent
-                */
-            } catch (IntentSender.SendIntentException e) {
-                // Log the error
-                e.printStackTrace();
-            }
-        } else {
-            /*
-             * If no resolution is available, display a dialog to the
-             * user with the error.
-             */
-            showErrorDialog(connectionResult.getErrorCode());
-        }
-    }
-    ...
+}
+
+protected void startLocationUpdates() {
+    LocationServices.FusedLocationApi.requestLocationUpdates(
+            mGoogleApiClient, mLocationRequest, this);
 }
 </pre>
-<h3>Define the location update callback</h3>
-<p>
-    Location Services sends location updates to your app either as an {@link android.content.Intent}
-    or as an argument passed to a callback method you define. This lesson shows you how to get the
-    update using a callback method, because that pattern works best for most use cases. If you want
-    to receive updates in the form of an {@link android.content.Intent}, read the lesson
-    <a href="activity-recognition.html">Recognizing the User's Current Activity</a>, which
-    presents a similar pattern.
-</p>
-<p>
-    The callback method that Location Services invokes to send a location update to your app is
-    specified in the
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationListener.html">LocationListener</a></code>
-    interface, in the method
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationListener.html#onLocationChanged(android.location.Location)">onLocationChanged()</a></code>.
-    The incoming argument is a {@link android.location.Location} object containing the location's
-    latitude and longitude. The following snippet shows how to specify the interface and define
-    the method:
-</p>
+
+<p>Notice that the above code snippet refers to a boolean flag,
+  {@code mRequestingLocationUpdates}, used to track whether the user has
+  turned location updates on or off. For more about retaining the value of this
+  flag across instances of the activity, see
+  <a href="#save-state">Save the State of the Activity</a>.
+
+<h2 id="callback">Define the Location Update Callback</h2>
+
+<p>The fused location provider invokes the
+  <a href="{@docRoot}reference/com/google/android/gms/location/LocationListener.html#onLocationChanged(android.location.Location)">{@code LocationListener.onLocationChanged()}</a>
+  callback method. The incoming argument is a {@link android.location.Location}
+  object containing the location's latitude and longitude. The following snippet
+  shows how to implement the
+  <a href="{@docRoot}reference/com/google/android/gms/location/LocationListener.html">{@code LocationListener}</a>
+  interface and define the method, then get the timestamp of the location update
+  and display the latitude, longitude and timestamp on your app's user
+  interface:</p>
+
 <pre>
-public class MainActivity extends FragmentActivity implements
-        GooglePlayServicesClient.ConnectionCallbacks,
-        GooglePlayServicesClient.OnConnectionFailedListener,
-        LocationListener {
+public class MainActivity extends ActionBarActivity implements
+        ConnectionCallbacks, OnConnectionFailedListener, LocationListener {
     ...
-    // Define the callback method that receives location updates
     &#64;Override
     public void onLocationChanged(Location location) {
-        // Report to the UI that the location was updated
-        String msg = "Updated Location: " +
-                Double.toString(location.getLatitude()) + "," +
-                Double.toString(location.getLongitude());
-        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
+        mCurrentLocation = location;
+        mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
+        updateUI();
+    }
+
+    private void updateUI() {
+        mLatitudeTextView.setText(String.valueOf(mCurrentLocation.getLatitude()));
+        mLongitudeTextView.setText(String.valueOf(mCurrentLocation.getLongitude()));
+        mLastUpdateTimeTextView.setText(mLastUpdateTime);
     }
-    ...
 }
 </pre>
-<p>
-    Now that you have the callbacks prepared, you can set up the request for location updates.
-    The first step is to specify the parameters that control the updates.
-</p>
-<!-- Specify update parameters -->
-<h2 id="UpdateParameters">Specify Update Parameters</h2>
-<p>
-    Location Services allows you to control the interval between updates and the location accuracy
-    you want, by setting the values in a
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html">LocationRequest</a></code>
-    object and then sending this object as part of your request to start updates.
-</p>
-<p>
-    First, set the following interval parameters:
-</p>
-<dl>
-    <dt>
-        Update interval
-    </dt>
-    <dd>
-        Set by
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setInterval(long)">LocationRequest.setInterval()</a></code>.
-        This method sets the rate in milliseconds at which your app prefers to receive location
-        updates. If no other apps are receiving updates from Location Services, your app will
-        receive updates at this rate.
-    </dd>
-    <dt>
-        Fastest update interval
-    </dt>
-    <dd>
-        Set by
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setFastestInterval(long)">LocationRequest.setFastestInterval()</a></code>.
-        This method sets the <b>fastest</b> rate in milliseconds at which your app can handle
-        location updates. You need to set this rate because other apps also affect the rate
-        at which updates are sent. Location Services sends out updates at the fastest rate that any
-        app requested by calling
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setInterval(long)">LocationRequest.setInterval()</a></code>.
-        If this rate is faster than your app can handle, you may encounter problems with UI flicker
-        or data overflow. To prevent this, call
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setFastestInterval(long)">LocationRequest.setFastestInterval()</a></code>
-        to set an upper limit to the update rate.
-        <p>
-            Calling
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setFastestInterval(long)">LocationRequest.setFastestInterval()</a></code>
-            also helps to save power. When you request a preferred update rate by calling
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setInterval(long)">LocationRequest.setInterval()</a></code>,
-            and a maximum rate by calling
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setFastestInterval(long)">LocationRequest.setFastestInterval()</a></code>,
-            then your app gets the same update rate as the fastest rate in the system. If other
-            apps have requested a faster rate, you get the benefit of a faster rate. If no other
-            apps have a faster rate request outstanding, your app receives updates at the rate you specified
-        with
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#setInterval(long)">LocationRequest.setInterval()</a></code>.
-        </p>
-    </dd>
-</dl>
-<p>
-    Next, set the accuracy parameter. In a foreground app, you need constant location updates with
-    high accuracy, so use the setting
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationRequest.html#PRIORITY_HIGH_ACCURACY">LocationRequest.PRIORITY_HIGH_ACCURACY</a></code>.
-</p>
-<p>
-    The following snippet shows how to set the update interval and accuracy in
-    {@link android.support.v4.app.FragmentActivity#onCreate onCreate()}:
-</p>
+
+<h2 id="stop-updates">Stop Location Updates</h2>
+
+<p>Consider whether you want to stop the location updates when the activity is
+  no longer in focus, such as when the user switches to another app or to a
+  different activity in the same app. This can be handy to reduce power
+  consumption, provided the app doesn't need to collect information even when
+  it's running in the background. This section shows how you can stop the
+  updates in the activity's
+  {@link android.app.Activity#onPause onPause()} method.</p>
+
+<p>To stop location updates, call
+  <a href="{@docRoot}reference/com/google/android/gms/location/FusedLocationProviderApi.html#removeLocationUpdates(com.google.android.gms.common.api.GoogleApiClient, com.google.android.gms.location.LocationListener)">{@code removeLocationUpdates()}</a>,
+  passing it your instance of the
+  <a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.html">{@code GoogleApiClient}</a>
+  object and a
+  <a href="{@docRoot}reference/com/google/android/gms/location/LocationListener.html">{@code LocationListener}</a>,
+  as shown in the following code sample:</p>
+
 <pre>
-public class MainActivity extends FragmentActivity implements
-        GooglePlayServicesClient.ConnectionCallbacks,
-        GooglePlayServicesClient.OnConnectionFailedListener,
-        LocationListener {
-    ...
-    // Global constants
-    ...
-    // Milliseconds per second
-    private static final int MILLISECONDS_PER_SECOND = 1000;
-    // Update frequency in seconds
-    public static final int UPDATE_INTERVAL_IN_SECONDS = 5;
-    // Update frequency in milliseconds
-    private static final long UPDATE_INTERVAL =
-            MILLISECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS;
-    // The fastest update frequency, in seconds
-    private static final int FASTEST_INTERVAL_IN_SECONDS = 1;
-    // A fast frequency ceiling in milliseconds
-    private static final long FASTEST_INTERVAL =
-            MILLISECONDS_PER_SECOND * FASTEST_INTERVAL_IN_SECONDS;
-    ...
-    // Define an object that holds accuracy and frequency parameters
-    LocationRequest mLocationRequest;
-    ...
-    &#64;Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        // Create the LocationRequest object
-        mLocationRequest = LocationRequest.create();
-        // Use high accuracy
-        mLocationRequest.setPriority(
-                LocationRequest.PRIORITY_HIGH_ACCURACY);
-        // Set the update interval to 5 seconds
-        mLocationRequest.setInterval(UPDATE_INTERVAL);
-        // Set the fastest update interval to 1 second
-        mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
-        ...
-    }
-    ...
+&#64;Override
+protected void onPause() {
+    super.onPause();
+    stopLocationUpdates();
+}
+
+protected void stopLocationUpdates() {
+    LocationServices.FusedLocationApi.removeLocationUpdates(
+            mGoogleApiClient, this);
 }
 </pre>
-<p class="note">
-   <strong>Note:</strong> If your app accesses the network or does other long-running work after
-   receiving a location update, adjust the fastest interval to a slower value. This prevents your
-   app from receiving updates it can't use. Once the long-running work is done, set the fastest
-   interval back to a fast value.
-</p>
-<!-- Start Location Updates -->
-<h2 id="StartUpdates">Start Location Updates</h2>
-<p>
-    To send the request for location updates, create a location client in
-    {@link android.support.v4.app.FragmentActivity#onCreate onCreate()}, then connect it and make
-    the request by calling
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationClient.html#requestLocationUpdates(com.google.android.gms.location.LocationRequest, com.google.android.gms.location.LocationListener)">requestLocationUpdates()</a></code>.
-    Since your client must be connected for your app to receive updates, you should
-    connect the client in
-    {@link android.support.v4.app.FragmentActivity#onStart onStart()}. This ensures that you always
-    have a valid, connected client while your app is visible. Since you need a connection before you
-    can request updates, make the update request in
-<code><a href="{@docRoot}reference/com/google/android/gms/common/GooglePlayServicesClient.ConnectionCallbacks.html#onConnected(android.os.Bundle)">ConnectionCallbacks.onConnected()</a></code>
-</p>
-<p>
-    Remember that the user may want to turn off location updates for various reasons. You should
-    provide a way for the user to do this, and you should ensure that you don't start updates in
-    {@link android.support.v4.app.FragmentActivity#onStart onStart()} if updates were previously
-    turned off. To track the user's preference, store it in your app's
-    {@link android.content.SharedPreferences} in
-    {@link android.support.v4.app.FragmentActivity#onPause onPause()} and retrieve it in
-    {@link android.support.v4.app.FragmentActivity#onResume onResume()}.
-</p>
-<p>
-    The following snippet shows how to set up the client in
-    {@link android.support.v4.app.FragmentActivity#onCreate onCreate()}, and how to connect it
-    and request updates in {@link android.support.v4.app.FragmentActivity#onStart onStart()}:
-</p>
+
+<p>Use a boolean, {@code mRequestingLocationUpdates}, to track
+  whether location updates are currently turned on. In the activity's
+  {@link android.app.Activity#onResume onResume()} method, check
+  whether location updates are currently active, and activate them if not:</p>
+
 <pre>
-public class MainActivity extends FragmentActivity implements
-        GooglePlayServicesClient.ConnectionCallbacks,
-        GooglePlayServicesClient.OnConnectionFailedListener,
-        LocationListener {
-    ...
-    // Global variables
-    ...
-    LocationClient mLocationClient;
-    boolean mUpdatesRequested;
-    ...
-    &#64;Override
-    protected void onCreate(Bundle savedInstanceState) {
-        ...
-        // Open the shared preferences
-        mPrefs = getSharedPreferences("SharedPreferences",
-                Context.MODE_PRIVATE);
-        // Get a SharedPreferences editor
-        mEditor = mPrefs.edit();
-        /*
-         * Create a new location client, using the enclosing class to
-         * handle callbacks.
-         */
-        mLocationClient = new LocationClient(this, this, this);
-        // Start with updates turned off
-        mUpdatesRequested = false;
-        ...
-    }
-    ...
-    &#64;Override
-    protected void onPause() {
-        // Save the current setting for updates
-        mEditor.putBoolean("KEY_UPDATES_ON", mUpdatesRequested);
-        mEditor.commit();
-        super.onPause();
-    }
-    ...
-    &#64;Override
-    protected void onStart() {
-        ...
-        mLocationClient.connect();
+&#64;Override
+public void onResume() {
+    super.onResume();
+    if (mGoogleApiClient.isConnected() && !mRequestingLocationUpdates) {
+        startLocationUpdates();
     }
-    ...
-    &#64;Override
-    protected void onResume() {
-        /*
-         * Get any previous setting for location updates
-         * Gets "false" if an error occurs
-         */
-        if (mPrefs.contains("KEY_UPDATES_ON")) {
-            mUpdatesRequested =
-                    mPrefs.getBoolean("KEY_UPDATES_ON", false);
-
-        // Otherwise, turn off location updates
-        } else {
-            mEditor.putBoolean("KEY_UPDATES_ON", false);
-            mEditor.commit();
-        }
-    }
-    ...
-    /*
-     * Called by Location Services when the request to connect the
-     * client finishes successfully. At this point, you can
-     * request the current location or start periodic updates
-     */
-    &#64;Override
-    public void onConnected(Bundle dataBundle) {
-        // Display the connection status
-        Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
-        // If already requested, start periodic updates
-        if (mUpdatesRequested) {
-            mLocationClient.requestLocationUpdates(mLocationRequest, this);
-        }
-    }
-    ...
 }
 </pre>
-<p>
-    For more information about saving preferences, read
-<a href="{@docRoot}training/basics/data-storage/shared-preferences.html">Saving Key-Value Sets</a>.
-</p>
-<!--
-    Stop Location Updates
- -->
-<h2 id="StopUpdates">Stop Location Updates</h2>
-<p>
-    To stop location updates, save the state of the update flag in
-    {@link android.support.v4.app.FragmentActivity#onPause onPause()}, and stop updates in
-    {@link android.support.v4.app.FragmentActivity#onStop onStop()} by calling
-<code><a href="{@docRoot}reference/com/google/android/gms/location/LocationClient.html#removeLocationUpdates(com.google.android.gms.location.LocationListener)">removeLocationUpdates(LocationListener)</a></code>.
-    For example:
-</p>
+
+<h2 id="save-state">Save the State of the Activity</h2>
+
+<p>A change to the device's configuration, such as a change in screen
+  orientation or language, can cause the current activity to be destroyed. Your
+  app must therefore store any information it needs to recreate the activity.
+  One way to do this is via an instance state stored in a
+  {@link android.os.Bundle} object.</p>
+
+<p>The following code sample shows how to use the activity's
+  <a href="{@docRoot}reference/android/app/Activity.html#onSaveInstanceState(android.os.Bundle)">{@code onSaveInstanceState()}</a>
+  callback to save the instance state:</p>
+
 <pre>
-public class MainActivity extends FragmentActivity implements
-        GooglePlayServicesClient.ConnectionCallbacks,
-        GooglePlayServicesClient.OnConnectionFailedListener,
-        LocationListener {
+public void onSaveInstanceState(Bundle savedInstanceState) {
+    savedInstanceState.putBoolean(REQUESTING_LOCATION_UPDATES_KEY,
+            mRequestingLocationUpdates);
+    savedInstanceState.putParcelable(LOCATION_KEY, mCurrentLocation);
+    savedInstanceState.putString(LAST_UPDATED_TIME_STRING_KEY, mLastUpdateTime);
+    super.onSaveInstanceState(savedInstanceState);
+}
+</pre>
+
+<p>Define an {@code updateValuesFromBundle()} method to restore
+  the saved values from the previous instance of the activity, if they're
+  available. Call the method from the activity's
+  {@link android.app.Activity#onCreate onCreate()} method, as shown in the
+  following code sample:</p>
+
+<pre>
+&#64;Override
+public void onCreate(Bundle savedInstanceState) {
     ...
-    /*
-     * Called when the Activity is no longer visible at all.
-     * Stop updates and disconnect.
-     */
-    &#64;Override
-    protected void onStop() {
-        // If the client is connected
-        if (mLocationClient.isConnected()) {
-            /*
-             * Remove location updates for a listener.
-             * The current Activity is the listener, so
-             * the argument is "this".
-             */
-            removeLocationUpdates(this);
+    updateValuesFromBundle(savedInstanceState);
+}
+
+private void updateValuesFromBundle(Bundle savedInstanceState) {
+    if (savedInstanceState != null) {
+        // Update the value of mRequestingLocationUpdates from the Bundle, and
+        // make sure that the Start Updates and Stop Updates buttons are
+        // correctly enabled or disabled.
+        if (savedInstanceState.keySet().contains(REQUESTING_LOCATION_UPDATES_KEY)) {
+            mRequestingLocationUpdates = savedInstanceState.getBoolean(
+                    REQUESTING_LOCATION_UPDATES_KEY);
+            setButtonsEnabledState();
+        }
+
+        // Update the value of mCurrentLocation from the Bundle and update the
+        // UI to show the correct latitude and longitude.
+        if (savedInstanceState.keySet().contains(LOCATION_KEY)) {
+            // Since LOCATION_KEY was found in the Bundle, we can be sure that
+            // mCurrentLocationis not null.
+            mCurrentLocation = savedInstanceState.getParcelable(LOCATION_KEY);
+        }
+
+        // Update the value of mLastUpdateTime from the Bundle and update the UI.
+        if (savedInstanceState.keySet().contains(LAST_UPDATED_TIME_STRING_KEY)) {
+            mLastUpdateTime = savedInstanceState.getString(
+                    LAST_UPDATED_TIME_STRING_KEY);
         }
-        /*
-         * After disconnect() is called, the client is
-         * considered "dead".
-         */
-        mLocationClient.disconnect();
-        super.onStop();
+        updateUI();
     }
-    ...
 }
 </pre>
-<p>
-    You now have the basic structure of an app that requests and receives periodic location updates.
-    You can combine the features described in this lesson with the geofencing, activity recognition,
-    or reverse geocoding features described in other lessons in this class.
-</p>
-<p>
-    The next lesson, <a href="display-address.html">Displaying a Location Address</a>, shows you how
-    to use the current location to display the current street address.
-</p>
+
+<p>For more about saving instance state, see the
+  <a href="{@docRoot}reference/android/app/Activity.html#ConfigurationChanges">Android
+  Activity</a> class reference.</p>
+
+<p class="note"><strong>Note:</strong> For a more persistent storage, you can
+  store the user's preferences in your app's
+  {@link android.content.SharedPreferences}. Set the shared preference in
+  your activity's {@link android.app.Activity#onPause onPause()} method, and
+  retrieve the preference in {@link android.app.Activity#onResume onResume()}.
+  For more information about saving preferences, read
+  <a href="{@docRoot}training/basics/data-storage/shared-preferences.html">Saving
+  Key-Value Sets</a>.</p>
+
+<p>The next lesson,
+  <a href="display-address.html">Displaying a Location Address</a>, shows
+  you how to display the street address for a given location.</p>