add a dynamic get method to shared_preferences (flutter#375)

* add a dynamic get method

* fixed typo

* Update shared_preferences.dart

* Update pubspec.yaml

* Update CHANGELOG.md

Author: long1eu

packages/shared_preferences/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.2
+
+* Added an getter that can retrieve values of any type
+
 ## 0.3.1
 
 * Simplified and upgraded Android project template to Android SDK 27.

packages/shared_preferences/lib/shared_preferences.dart

@@ -46,6 +46,9 @@ class SharedPreferences {
   /// in sync since the setter method might fail for any reason.
   final Map<String, Object> _preferenceCache;
 
+  /// Reads a value of any type from persistent storage.
+  dynamic get(String key) => _preferenceCache[key];
+
   /// Reads a value from persistent storage, throwing an exception if it's not a
   /// bool.
   bool getBool(String key) => _preferenceCache[key];

packages/shared_preferences/pubspec.yaml

@@ -1,7 +1,7 @@
 name: shared_preferences
 description: Flutter plugin for reading and writing simple key-value pairs.
   Wraps NSUserDefaults on iOS and SharedPreferences on Android.
-version: 0.3.1
+version: 0.3.2
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/shared_preferences
 

packages/shared_preferences/test/shared_preferences_test.dart

@@ -48,6 +48,11 @@ void main() {
     });
 
     test('reading', () async {
+      expect(preferences.get('String'), kTestValues['flutter.String']);
+      expect(preferences.get('bool'), kTestValues['flutter.bool']);
+      expect(preferences.get('int'), kTestValues['flutter.int']);
+      expect(preferences.get('double'), kTestValues['flutter.double']);
+      expect(preferences.get('List'), kTestValues['flutter.List']);
       expect(preferences.getString('String'), kTestValues['flutter.String']);
       expect(preferences.getBool('bool'), kTestValues['flutter.bool']);
       expect(preferences.getInt('int'), kTestValues['flutter.int']);