Addressed comments; fixed permissions

packages/location_background/android/src/main/java/com/flutter/example/locationbackgroundplugin/LocationBackgroundPlugin.java

@@ -17,10 +17,6 @@ public static void registerWith(Registrar registrar) {
 
   @Override
   public void onMethodCall(MethodCall call, Result result) {
-    if (call.method.equals("getPlatformVersion")) {
-      result.success("Android " + android.os.Build.VERSION.RELEASE);
-    } else {
-      result.notImplemented();
-    }
+    result.notImplemented();
   }
 }

packages/location_background/example/ios/Runner/Info.plist

@@ -36,6 +36,10 @@
         <string>gps</string>
 		<string>armv7</string>
 	</array>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>location</string>
+	</array>
 	<key>UISupportedInterfaceOrientations</key>
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>

packages/location_background/example/lib/background.dart

@@ -7,18 +7,18 @@ import 'dart:ui';
 import 'package:location_background_plugin/location_background_plugin.dart';
 
 const String kLocationPluginPortName = 'location_plugin_port';
-SendPort uiSendPort;
 
 /// This is an example of a callback for LocationBackgroundPlugin's
 /// `startMonitoringLocation`. A callback can be defined anywhere in an
 /// application's code, but cannot be from another program.
-class Foo {
+class LocationMonitor {
   static void locationCallback(Location location) {
-    if (uiSendPort == null) {
-      // We use isolate ports to communicate between the main isolate and spawned
-      // isolates since they do not share memory.
-      uiSendPort = IsolateNameServer.lookupPortByName(kLocationPluginPortName);
-    }
+    print('Background Location: $location');
+    // We use isolate ports to communicate between the main isolate and spawned
+    // isolates since they do not share memory. The port lookup will return
+    // null if the UI isolate has explicitly removed the mapping on shutdown.
+    final SendPort uiSendPort =
+        IsolateNameServer.lookupPortByName(kLocationPluginPortName);
     uiSendPort?.send(location.toJson());
   }
 }

packages/location_background/example/lib/main.dart

@@ -52,6 +52,10 @@ class _MyAppState extends State<MyApp> {
       setState(() {
         _lastLocation = location;
       });
+    }, onDone: () {
+      // Remove the port mapping just in case the UI is shutting down but
+      // background isolate is continuing to run.
+      IsolateNameServer.removePortNameMapping(kLocationPluginPortName);
     });
     _locationPlugin ??= LocationBackgroundPlugin();
   }
@@ -112,7 +116,7 @@ class _MyAppState extends State<MyApp> {
                     onPressed: () async {
                       if (!_isTracking) {
                         await _locationPlugin
-                            .monitorLocationChanges(Foo.locationCallback);
+                            .monitorLocationChanges(LocationMonitor.locationCallback);
                       } else {
                         await _locationPlugin.cancelLocationUpdates();
                       }

packages/location_background/ios/Classes/LocationBackgroundPlugin.m

@@ -117,6 +117,7 @@ - (void)monitorLocationChanges:(NSArray *)arguments {
   _locationManager.distanceFilter = [arguments[3] integerValue];
   _locationManager.desiredAccuracy = [arguments[4] integerValue];
   _locationManager.activityType = [arguments[5] integerValue];
+  _locationManager.allowsBackgroundLocationUpdates = YES;
   [self->_locationManager startUpdatingLocation];
 }
 

packages/location_background/lib/location_background_plugin.dart

@@ -135,8 +135,8 @@ class LocationBackgroundPlugin {
   LocationActivityType activityType;
 
   LocationBackgroundPlugin(
-      {this.pauseLocationUpdatesAutomatically = true,
-      this.showsBackgroundLocationIndicator = false,
+      {this.pauseLocationUpdatesAutomatically = false,
+      this.showsBackgroundLocationIndicator = true,
       this.distanceFilter = 0,
       this.desiredAccuracy = LocationAccuracy.best,
       this.activityType = LocationActivityType.other}) {