can not pair with HM-A300 printer

[drunisa007]

W/BluetoothAdapter(23880): getBluetoothService() called with no BluetoothManagerCallback
D/BluetoothBasicPlugin(23880): stateStreamHandler, current action: android.bluetooth.device.action.ACL_CONNECTED
E/flutter (20762): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: Bad state: Future already completed
E/flutter (20762): #0 _AsyncCompleter.complete (dart:async/future_impl.dart:43:31)
E/flutter (20762): #1 PrinterBluetoothManager.writeBytes. (package:esc_pos_bluetooth/src/printer_bluetooth_manager.dart:117:23)
E/flutter (20762):
E/flutter (20762): #2 PrinterBluetoothManager.writeBytes. (package:esc_pos_bluetooth/src/printer_bluetooth_manager.dart)
E/flutter (20762): #3 _rootRunUnary (dart:async/zone.dart:1198:47)
E/flutter (20762): #4 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter (20762): #5 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
E/flutter (20762): #6 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:357:11)
E/flutter (20762): #7 _DelayedData.perform (dart:async/stream_impl.dart:611:14)
E/flutter (20762): #8 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:730:11)
E/flutter (20762): #9 _PendingEvents.schedule. (dart:async/stream_impl.dart:687:7)
E/flutter (20762): #10 _rootRun (dart:async/zone.dart:1182:47)
E/flutter (20762): #11 _CustomZone.run (dart:async/zone.dart:1093:19)
E/flutter (20762): #12 _CustomZone.runGuarded (dart:async/zone.dart:997:7)
E/flutter (20762): #13 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:1037:23)
E/flutter (20762): #14 _rootRun (dart:async/zone.dart:1190:13)
E/flutter (20762): #15 _CustomZone.run (dart:async/zone.dart:1093:19)
E/flutter (20762): #16 _CustomZone.runGuarded (dart:async/zone.dart:997:7)
E/flutter (20762): #17 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:1037:23)
E/flutter (20762): #18 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
E/flutter (20762): #19 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
E/flutter (20762):
E/MethodChannel#flutter_bluetooth_basic/methods(23880): Failed to handle method call
E/MethodChannel#flutter_bluetooth_basic/methods(23880): java.lang.NullPointerException: Attempt to invoke virtual method 'void com.tablemi.flutter_bluetooth_basic.DeviceConnFactoryManager$PrinterReader.cancel()' on a null object reference
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at com.tablemi.flutter_bluetooth_basic.FlutterBluetoothBasicPlugin.disconnect(FlutterBluetoothBasicPlugin.java:250)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at com.tablemi.flutter_bluetooth_basic.FlutterBluetoothBasicPlugin.onMethodCall(FlutterBluetoothBasicPlugin.java:113)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:692)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at android.os.MessageQueue.next(MessageQueue.java:330)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at android.os.Looper.loop(Looper.java:169)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at android.app.ActivityThread.main(ActivityThread.java:7094)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:536)
E/MethodChannel#flutter_bluetooth_basic/methods(23880): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:928)
E/flutter (23880): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: PlatformException(error, Attempt to invoke virtual method 'void com.tablemi.flutter_bluetooth_basic.DeviceConnFactoryManager$PrinterReader.cancel()' on a null object reference, null, java.lang.NullPointerException: Attempt to invoke virtual method 'void com.tablemi.flutter_bluetooth_basic.DeviceConnFactoryManager$PrinterReader.cancel()' on a null object reference
E/flutter (23880): at com.tablemi.flutter_bluetooth_basic.FlutterBluetoothBasicPlugin.disconnect(FlutterBluetoothBasicPlugin.java:250)
E/flutter (23880): at com.tablemi.flutter_bluetooth_basic.FlutterBluetoothBasicPlugin.onMethodCall(FlutterBluetoothBasicPlugin.java:113)
E/flutter (23880): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
E/flutter (23880): at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
E/flutter (23880): at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:692)
E/flutter (23880): at android.os.MessageQueue.nativePollOnce(Native Method)
E/flutter (23880): at android.os.MessageQueue.next(MessageQueue.java:330)
E/flutter (23880): at android.os.Looper.loop(Looper.java:169)
E/flutter (23880): at android.app.ActivityThread.main(ActivityThread.java:7094)
E/flutter (23880): at java.lang.reflect.Method.invoke(Native Method)
E/flutter (23880): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:536)
E/flutter (23880): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:928)

[MyoMyatAung]

So do I. I'm finding out now. LOL

[FulingFan-1]

Did you solve this issues?

[drunisa007]

use bluetooth termal printer

…

On Fri, Dec 4, 2020 at 8:27 AM FulingFan-1 ***@***.***> wrote: Did you solve this issues? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#45 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOMAHU5H5A74255SZLKJDSLSTA6X7ANCNFSM4UAP73OA> .