运行时出现Flutter项目，显示错误无效参数：源不得为null

Question

I'm new to flutter. I created a simple flutter project when I trying to run. I was getting this error Unexpected failure from adb: Invalid argument(s): The source must not be null

Error launching the application on emulator-5554 This is my simple flutter application code:

import `package:flutter/material.dart`;
 void main(){
    runApp(
       new Center(
        child: new Text(
          "hello, world",
           textDirection: TextDirection.ltr,
        )
       )
    );
 }

Can anyone suggest me what might be the issue? How should I have to fix it?

Answer 1

这仅仅是由于ADB引起的问题，这意味着未正确连接的设备或仿真器可能会丢失电缆或其他任何东西，因此请首先验证您的设备是否完美连接了有关adb或设备连接的问题。

Answer 2

When you connect the phone, there is options like USB Tethering, MIDI, PTP, file transfer etc... Choose PTP. If it doesn't work try MIDI. It will work.