Update platform_services to query battery level instead of location. (#8554)

diff --git a/examples/platform_services/lib/main.dart b/examples/platform_services/lib/main.dart
index 22a397a..f1a7ab0 100644
--- a/examples/platform_services/lib/main.dart
+++ b/examples/platform_services/lib/main.dart
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
@@ -13,20 +14,23 @@
 }
 
 class _PlatformServicesState extends State<PlatformServices> {
-  static const PlatformMethodChannel platform = const PlatformMethodChannel('geo');
-  String _location = 'Unknown location.';
+  static const PlatformMethodChannel platform = const PlatformMethodChannel('battery');
+  String _batteryLevel = 'Unknown battery level.';
 
-  Future<Null> _getLocation() async {
-    String location;
-    try {
-      final List<double> result = await platform.invokeMethod('getLocation', 'network');
-      location = 'Latitude ${result[0]}, Longitude ${result[1]}.';
-    } on PlatformException catch (e) {
-      location = "Failed to get location: '${e.message}'.";
+  Future<Null> _getBatteryLevel() async {
+    String batteryLevel;
+    if (Platform.isIOS) {
+      batteryLevel = "iOS is not supported yet.";
+    } else {
+      try {
+        final int result = await platform.invokeMethod('getBatteryLevel');
+        batteryLevel = 'Battery level at $result. %';
+      } on PlatformException catch (e) {
+        batteryLevel = "Failed to get battery level: '${e.message}'.";
+      }
     }
-
     setState(() {
-      _location = location;
+      _batteryLevel = batteryLevel;
     });
   }
 
@@ -38,17 +42,17 @@
           mainAxisAlignment: MainAxisAlignment.spaceEvenly,
           children: <Widget>[
             new RaisedButton(
-              child: new Text('Get Location'),
-              onPressed: _getLocation,
+              child: new Text('Get Battery Level'),
+              onPressed: _getBatteryLevel,
             ),
-            new Text(_location)
+            new Text(_batteryLevel)
           ],
-        ),
-      ),
+        )
+      )
     );
   }
 }
-
+  
 void main() {
   runApp(new PlatformServices());
 }