Question 182400 in Flutter Question posted in
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how to execute two asynchronous functions with flutter?

I have two functions in flutter. the first one is belManager.writeCharacteristic and the second one is belManager.disonnect I want to execute belManager.disonnect() after belManager.writeCharacteristic is completed. However for some reason bleManager.disonenct() is called before belManager.writeCharacteristic is completed.
this is the code:

   switch (currentState) {
                    case BluetoothDeviceState.connected:
          await bleManager!.writeCharacteristic();
                      await bleManager.disconnect()
                      break;
                    case BluetoothDeviceState.disconnected:
                      print("please connect");
                      break;

thanks in advance for your suggestions.

Tags:

2

Answers


  1. 0

    Follow these steps and update your question with more detailed code if it doesn’t help:

    • Check if your function has async, without it all the awaits are useless.
    • Put a try/catch inside the switch, so if it generates an exception, you can easily find it.
    • Call the disconnect() method inside a .then() right after your writeCharacteristic(), by doing so you should be able to "force" firing disconnect() method only when writeCharacteristic() is completed.
    • Check if the Future from writeCharacheristic() is normally completed and it does what it should.

    If this doesn’t help please comment below and update your question, happy coding!

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  2. 0

    You just need to wrap your logic inside Async Function so you can easily await the methods.

      getConnectionStatus(var currentState)async{
switch (currentState) {
  case BluetoothDeviceState.connected:
    await bleManager!.writeCharacteristic();
await bleManager.disconnect()
break;
case BluetoothDeviceState.disconnected:
print("please connect");
break;}}
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