[hive_flutter] Export adapters

Exporting in a diferent file so users that have created their own
Color and TimeOfDay adapters don't get naming conflicts.

Author: baumths

hive_flutter/lib/adapters.dart

@@ -0,0 +1,7 @@
+import 'package:flutter/material.dart' show Color, TimeOfDay;
+import 'package:hive/hive.dart' show TypeAdapter, BinaryReader, BinaryWriter;
+
+export 'hive_flutter.dart';
+
+part 'src/adapters/color_adapter.dart';
+part 'src/adapters/time_adapter.dart';

hive_flutter/lib/src/adapters/color_adapter.dart

@@ -1,17 +1,11 @@
-import 'package:flutter/painting.dart';
-import 'package:hive/hive.dart';
+part of '../../adapters.dart';
 
 class ColorAdapter extends TypeAdapter<Color> {
   @override
-  Color read(BinaryReader reader) {
-    final colorValue = reader.readInt();
-    return Color(colorValue);
-  }
+  Color read(BinaryReader reader) => Color(reader.readInt());
 
   @override
-  void write(BinaryWriter writer, Color obj) {
-    writer.writeInt(obj.value);
-  }
+  void write(BinaryWriter writer, Color obj) => writer.writeInt(obj.value);
 
   @override
   int get typeId => 200;

hive_flutter/lib/src/adapters/time_adapter.dart

@@ -1,17 +1,11 @@
-import 'package:flutter/material.dart';
-import 'package:hive/hive.dart';
+part of '../../adapters.dart';
 
 class TimeAdapter extends TypeAdapter<TimeOfDay> {
   @override
-  TimeOfDay read(BinaryReader reader) {
-    final time = reader.read() as TimeOfDay;
-    return time;
-  }
+  TimeOfDay read(BinaryReader reader) => reader.read() as TimeOfDay;
 
   @override
-  void write(BinaryWriter writer, TimeOfDay obj) {
-    writer.write(obj);
-  }
+  void write(BinaryWriter writer, TimeOfDay obj) => writer.write(obj);
 
   @override
   int get typeId => 201;

hive_flutter/test/adapters/color_adapter_test.dart

@@ -1,7 +1,8 @@
-import 'package:flutter/material.dart';
+import 'dart:ui' show Color;
+
 import 'package:flutter_test/flutter_test.dart';
 import 'package:hive/hive.dart';
-import 'package:hive_flutter/src/adapters/color_adapter.dart';
+import 'package:hive_flutter/adapters.dart';
 import 'package:mockito/mockito.dart';
 
 import '../mocks.dart';

hive_flutter/test/adapters/time_adapter_test.dart

@@ -1,7 +1,7 @@
-import 'package:flutter/material.dart';
+import 'package:flutter/material.dart' show TimeOfDay;
 import 'package:flutter_test/flutter_test.dart';
 import 'package:hive/hive.dart';
-import 'package:hive_flutter/src/adapters/time_adapter.dart';
+import 'package:hive_flutter/adapters.dart';
 import 'package:mockito/mockito.dart';
 
 import '../mocks.dart';