Flutter 颤振2-Can'；t查找服务：软件包（Android Studio-Windows10）

在将工作项目升级为Flatter_2并运行它时，给出以下错误

，Avd数据（像素_3a）已被擦除

如何解决这个问题

错误

完全错误

颤振医生

---

删除与Avd相关的

锁定文件

解决了该问题

打开Avd管理器->显示磁盘->从磁盘删除以下2个锁定文件--->

---

硬件qemu&multiinstance.lock

Class

two

的构造函数接受（可选）命名参数，而不是位置参数。要么从构造函数的参数列表中删除大括号（

{

和

}

），使它们处于位置，要么作为

两个（a:4，b:5，c:6）

调用其构造函数。

Can't find service: package /  Can't find service: activity

Launching lib\forms\validateForm1.dart on sdk gphone x86 arm in debug mode...
Running Gradle task 'assembleDebug'...
√ Built build\app\outputs\flutter-apk\app-debug.apk.
cmd: Can't find service: activity
Installing build\app\outputs\flutter-apk\app.apk...
Error: ADB exited with exit code 1
Performing Streamed Install
    
adb: failed to install F:\Script\Flutter\myapp\build\app\outputs\flutter-apk\app.apk: cmd: Can't find service: package
Error launching application on sdk gphone x86 arm.

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel dev, 2.1.0-10.0.pre, on Microsoft Windows [Version 10.0.18363.1379], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[X] Chrome - develop for the web (Cannot find Chrome executable at .\Google\Chrome\Application\chrome.exe)
    ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[√] Visual Studio - develop for Windows (Visual Studio Community 2019 16.8.3)
[√] Android Studio (version 4.1.0)
[√] VS Code (version 1.54.1)
[√] Connected device (2 available)