1. Running Gradle task 'assembleDebug'...
===============================================
卡在 Running Gradle task 'assembleDebug'... 不动
解决方案：
- 检查 ./gradle 是否下载成功
- 检查
gradle默认代理是否正常
gradle配置文件默认在~/.gradle/gradle.properties注释掉下面几行代码即可：
# Sun Jul 05 10:38:23 CST 2020
# systemProp.http.proxyHost=127.0.0.1
# systemProp.http.proxyPort=50030
# systemProp.https.proxyHost=127.0.0.1
# systemProp.https.proxyPort=50030
2. flutter doctor 异常
==================================== android sdk platforms 下载失败 检查网络代理，是否能正常访问 https://dl.google.com
3. Caused by: org.gradle.api.internal.plugins.PluginApplicationException: Failed to apply plugin class 'FlutterPlugin'.
这是一个非常不明所以的问题：android 集成flutter module时，按照官网说明完毕必会出现
4. 非空检查相关异常：Error: Cannot run with sound null safety, because the following dependencies
flutter run --no-sound-null-safety