单例模式

.idea/workspace.xml

@@ -3,7 +3,10 @@
   <component name="ChangeListManager">
     <list default="true" id="2f8e3712-04e2-429a-bcea-c8db1a54008e" name="默认变更列表" comment="">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/lib/main.dart" beforeDir="false" afterPath="$PROJECT_DIR$/example/lib/main.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/pubspec.lock" beforeDir="false" afterPath="$PROJECT_DIR$/example/pubspec.lock" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/lib/dj_printer.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/dj_printer.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pubspec.lock" beforeDir="false" afterPath="$PROJECT_DIR$/pubspec.lock" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -48,7 +51,6 @@
   </component>
   <component name="PropertiesComponent">
     <property name="dart.analysis.tool.window.force.activate" value="true" />
-    <property name="dart.analysis.tool.window.visible" value="false" />
     <property name="io.flutter.reload.alreadyRun" value="true" />
     <property name="last_opened_file_path" value="$PROJECT_DIR$" />
     <property name="settings.editor.selected.configurable" value="flutter.settings" />

example/lib/main.dart

@@ -36,8 +36,8 @@ class _MyAppState extends State<MyApp> {
     if (!pers) {
       Permission.locationWhenInUse.request();
     }
-    DjPrinter.init();
-    DjPrinter.addDiscoveryListen(onReceive: (data) {
+    DjPrinter().init();
+    DjPrinter().addDiscoveryListen(onReceive: (data) {
       var js = json.decode(data.toString());
       devices.add(Device(
           name: js['name'], address: js['address'], isPaired: js['isPaired']));
@@ -46,9 +46,9 @@ class _MyAppState extends State<MyApp> {
       print("————————————————————————");
     }, onFinish: () {
       print('——————————————————————————————');
-      DjPrinter.cancelDiscovery();
+      DjPrinter().cancelDiscovery();
     });
-    DjPrinter.addConnectListen(onConnect: () {
+    DjPrinter().addConnectListen(onConnect: () {
       print("connected");
     }, onDisconnect: () {
       print('disconnected');
@@ -68,7 +68,7 @@ class _MyAppState extends State<MyApp> {
               TextButton(
                   onPressed: () {
                     devices.clear();
-                    DjPrinter.startSearch;
+                    DjPrinter().startSearch;
                   },
                   child: const Text('扫描设备')),
               // TextButton(onPressed: () {}, child: const Text('打印')),
@@ -78,7 +78,7 @@ class _MyAppState extends State<MyApp> {
               ...devices
                   .map((e) => TextButton(
                       onPressed: () {
-                        DjPrinter.connect(e.address);
+                        DjPrinter().connect(e.address);
                       },
                       child: Text(e.name)))
                   .toList(),
@@ -87,7 +87,7 @@ class _MyAppState extends State<MyApp> {
               ),
               TextButton(
                   onPressed: () {
-                    DjPrinter.print(
+                    DjPrinter().print(
                         code: 'ASSZ2022012500010002',
                         channel: 'cosco定提-月达-卡派',
                         country: '美国',

example/pubspec.lock

@@ -102,6 +102,13 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.12.11"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.1.2"
   meta:
     dependency: transitive
     description:
@@ -204,7 +211,7 @@ packages:
       name: test_api
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.4.3"
+    version: "0.4.8"
   typed_data:
     dependency: transitive
     description:

lib/dj_printer.dart

@@ -12,9 +12,9 @@ class DjPrinter {
   static const MethodChannel _channel = MethodChannel('dj_printer');
   static const EventChannel _deviceChannel =
       EventChannel("com.discovery.devices");
-  static StreamSubscription? _discoveryStream;
+  StreamSubscription? _discoveryStream;
 
-  static Future<StreamSubscription> addDiscoveryListen(
+  Future<StreamSubscription> addDiscoveryListen(
       {required void Function(dynamic data) onReceive,
       void Function()? onStart,
       void Function()? onFinish}) async {
@@ -33,7 +33,7 @@ class DjPrinter {
     }
   }
 
-  static void cancelDiscovery() {
+  void cancelDiscovery() {
     if (_discoveryStream != null) {
       _discoveryStream!.cancel();
       _discoveryStream = null;
@@ -41,9 +41,9 @@ class DjPrinter {
   }
 
   static const EventChannel _connectChannel = EventChannel("com.connect");
-  static StreamSubscription? _connectStream;
+  StreamSubscription? _connectStream;
 
-  static Future<StreamSubscription> addConnectListen(
+  Future<StreamSubscription> addConnectListen(
       {required void Function() onConnect,
       required void Function() onDisconnect}) async {
     if (_connectStream == null) {
@@ -59,24 +59,24 @@ class DjPrinter {
     }
   }
 
-  static void cancelConnect() {
+  void cancelConnect() {
     if (_connectStream != null) {
       _connectStream!.cancel();
       _connectStream = null;
     }
   }
 
-  static Future<bool?> get startSearch async {
+  Future<bool?> get startSearch async {
     final res = await _channel.invokeMethod('startSearch');
     return res;
   }
 
-  static Future<bool?> connect(String address) async {
+  Future<bool?> connect(String address) async {
     final res = await _channel.invokeMethod('connect', {'address': address});
     return res;
   }
 
-  static Future<bool?> init() async {
+  Future<bool?> init() async {
     final res = await _channel.invokeMethod('init');
     return res;
   }
@@ -86,7 +86,7 @@ class DjPrinter {
   //2 paper empty
   //4 cover open
   //8 battery low
-  static Future<PRINT_STATUS?> getStatus() async {
+  Future<PRINT_STATUS?> getStatus() async {
     final res = await _channel.invokeMethod('getStatus');
     switch (res) {
       case 0:
@@ -104,7 +104,7 @@ class DjPrinter {
     }
   }
 
-  static Future<bool?> print(
+  Future<bool?> print(
       {required String code,
       required String channel,
       required String country,

pubspec.lock

@@ -81,6 +81,13 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.12.11"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.1.2"
   meta:
     dependency: transitive
     description:
@@ -141,7 +148,7 @@ packages:
       name: test_api
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.4.3"
+    version: "0.4.8"
   typed_data:
     dependency: transitive
     description: