无法从 Android 上的特征读取数据，但可以在 iOS Flutter Blue 上读取

问题描述

我无法从 Android 上的特性读取数据，但能够在 iOS 设备上读取数据。谁能告诉我我遗漏了什么，以便数据也可以在 Android 上读取。

连接设备：-

try {
      await device.connect();
    } catch (error) {
      if (error.code != 'already_connected') {
        throw error;
      }
    } finally {
      List<BluetoothService> deviceServices = await device.discoverServices();
       _examineDeviceServicesForTestConnection(deviceServices,device);
    }

检查具有特征读取和通知的服务：-

_examineDeviceServicesForTestConnection(
      List<BluetoothService> services,BluetoothDevice device) async {
    BluetoothCharacteristic testReadCharacteristic;
    BluetoothCharacteristic testWriteCharacteristic;
    serviceLoop:
    for (BluetoothService service in services) {
      if (service.characteristics.isNotEmpty) {
        characteristicLoop:
        for (BluetoothCharacteristic characteristic
            in service.characteristics) {
          if (characteristic.properties.notify) {
            testReadCharacteristic = characteristic;
          }
          if (characteristic.properties.write) {
            testWriteCharacteristic = characteristic;
          }
        }
        if (testReadCharacteristic != null && testWriteCharacteristic != null) {
          final testCommand = "TEST_COMMAND";
          final convertedTestCommand = utf8.encode(testCommand);

          //reading data from characteristics
          _readDataFromcharacteristics(
              testReadCharacteristic,testWriteCharacteristic,device);

          //write command to device
          await testWriteCharacteristic.write(convertedTestCommand);
        }
      }
    }
  }

从特征中读取数据：-

_readDataFromcharacteristics(BluetoothCharacteristic readerCharx,BluetoothCharacteristic writerCharx,BluetoothDevice device) async {
    await readerCharx.setNotifyValue(true);
    readerCharx.value.listen((response) {
      var decodedResponse = utf8.decode(response);
      print(decodedResponse);
    });
  }

蓝牙和位置的必要权限

<uses-permission android:name="android.permission.BLUetoOTH" />
<uses-permission android:name="android.permission.BLUetoOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

解决方法

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