diff --git a/.idea/libraries/Flutter_Plugins.xml b/.idea/libraries/Flutter_Plugins.xml
index 4cd74f8..53449da 100644
--- a/.idea/libraries/Flutter_Plugins.xml
+++ b/.idea/libraries/Flutter_Plugins.xml
@@ -2,7 +2,6 @@
   <library name="Flutter Plugins" type="FlutterPluginsLibraryType">
     <CLASSES>
       <root url="file://$PROJECT_DIR$" />
-      <root url="file://$PROJECT_DIR$/../.pub-cache/hosted/pub.dartlang.org/permission_handler-7.0.0" />
     </CLASSES>
     <JAVADOC />
     <SOURCES />
diff --git a/android/src/main/java/com/hy/print/hy_printer/Bluetooth.java b/android/src/main/java/com/hy/print/hy_printer/Bluetooth.java
index 4d0f498..3fe67ca 100644
--- a/android/src/main/java/com/hy/print/hy_printer/Bluetooth.java
+++ b/android/src/main/java/com/hy/print/hy_printer/Bluetooth.java
@@ -104,7 +104,8 @@ public class Bluetooth {
                 String name = remoteDevice.getName();
                 System.out.println(name);
                 System.out.println(remoteDevice.getAddress());
-                if (remoteDevice != null && name != null) {
+                System.out.println(remoteDevice.getBluetoothClass().getMajorDeviceClass());
+                if (remoteDevice != null && name != null&&remoteDevice.getBluetoothClass().getMajorDeviceClass()==1536) {
                     if (remoteDevice.getBondState() != BluetoothDevice.BOND_BONDED) {
                         key = "{" + "\"name\":" + "\"" + name + "\"" + ","
                                 + "\"address\":" + "\"" + remoteDevice.getAddress() + "\"" + ","
diff --git a/example/lib/main.dart b/example/lib/main.dart
index f74e3ee..2d9536d 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -6,7 +6,7 @@ import 'package:hy_printer/device.dart';
 import 'package:hy_printer/dj_printer.dart';
 import 'package:hy_printer/hy_printer.dart';
 import 'package:hy_printer_example/scan_page.dart';
-import 'package:permission_handler/permission_handler.dart';
+// import 'package:permission_handler/permission_handler.dart';
 
 void main() {
   runApp(const MyApp());
@@ -32,22 +32,22 @@ class _MyAppState extends State<MyApp> {
   //   setState(() {});
   // }
   Future<void> initPlatformState() async {
-    var per = await Permission.bluetooth.isGranted;
-    if (!per) {
-      Permission.bluetooth.request();
-    }
-    var pers = await Permission.locationWhenInUse.isGranted;
-    if (!pers) {
-      Permission.locationWhenInUse.request();
-    }
-    var per1 = await Permission.bluetoothScan.isGranted;
-    if (!per1) {
-      Permission.bluetoothScan.request();
-    }
-    var per2 = await Permission.bluetoothConnect.isGranted;
-    if (!per2) {
-      Permission.bluetoothConnect.request();
-    }
+    // var per = await Permission.bluetooth.isGranted;
+    // if (!per) {
+    //   Permission.bluetooth.request();
+    // }
+    // var pers = await Permission.locationWhenInUse.isGranted;
+    // if (!pers) {
+    //   Permission.locationWhenInUse.request();
+    // }
+    // var per1 = await Permission.bluetoothScan.isGranted;
+    // if (!per1) {
+    //   Permission.bluetoothScan.request();
+    // }
+    // var per2 = await Permission.bluetoothConnect.isGranted;
+    // if (!per2) {
+    //   Permission.bluetoothConnect.request();
+    // }
 
     DjPrinter().init();
     DjPrinter().addDiscoveryListen(onReceive: (data) {
@@ -99,13 +99,14 @@ class _MyAppState extends State<MyApp> {
             ),
             ...devices
                 .map((e) => TextButton(
-                onPressed: () {
-                  [Permission.bluetoothConnect,].request().then((value) async {
-                    print("===============${value[Permission.bluetoothConnect]}");
-                    if(value[Permission.bluetoothConnect]!=PermissionStatus.denied){
-                      await DjPrinter().connect(e.address);
-                    }
-                  });
+                onPressed: ()async {
+                  // [Permission.bluetoothConnect,].request().then((value) async {
+                  //   print("===============${value[Permission.bluetoothConnect]}");
+                  //   if(value[Permission.bluetoothConnect]!=PermissionStatus.denied){
+                  //
+                  //   }
+                  // });
+                  await DjPrinter().connect(e.address);
                 //
 
                 },
diff --git a/example/pubspec.lock b/example/pubspec.lock
index 16068fc..f7efa5a 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -116,27 +116,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.1"
-  permission_handler:
-    dependency: "direct main"
-    description:
-      name: permission_handler
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "7.0.0"
-  permission_handler_platform_interface:
-    dependency: transitive
-    description:
-      name: permission_handler_platform_interface
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "3.7.0"
-  plugin_platform_interface:
-    dependency: transitive
-    description:
-      name: plugin_platform_interface
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -193,4 +172,4 @@ packages:
     version: "2.1.2"
 sdks:
   dart: ">=2.17.0-0 <3.0.0"
-  flutter: ">=2.5.0"
+  flutter: ">=1.20.0"
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index 5992583..d095612 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -17,7 +17,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  permission_handler: 7.0.0
+#  permission_handler: 10.0.0
   hy_printer:
     # When depending on this package from a real application you should use:
     #   hy_printer: ^x.y.z
diff --git a/pubspec.lock b/pubspec.lock
index 7612a5a..d4b1f47 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -102,27 +102,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.1"
-  permission_handler:
-    dependency: "direct main"
-    description:
-      name: permission_handler
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "7.0.0"
-  permission_handler_platform_interface:
-    dependency: transitive
-    description:
-      name: permission_handler_platform_interface
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "3.7.0"
-  plugin_platform_interface:
-    dependency: transitive
-    description:
-      name: plugin_platform_interface
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -179,4 +158,4 @@ packages:
     version: "2.1.2"
 sdks:
   dart: ">=2.17.0-0 <3.0.0"
-  flutter: ">=2.5.0"
+  flutter: ">=1.20.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 6c30509..b401cd2 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -11,7 +11,7 @@ dependencies:
   flutter:
     sdk: flutter
 #  flutter_blue_plus: ^1.3.1
-  permission_handler: 7.0.0
+#  permission_handler: 10.0.0
 dev_dependencies:
   flutter_test:
     sdk: flutter