打包Android APK是發(fā)生這類錯誤，主要是io.flutter庫沒有下載下來，重新配置一下國內(nèi)的資源

buildscript { ext.kotlin_version = '1.3.50'

?repositories {

?// google()

?// jcenter()

?maven { url 'http://maven.aliyun.com/nexus/content/repositories/google' }

?maven { url 'http://maven.aliyun.com/nexus/content/repositories/jcenter' }?

?maven { url 'https://jitpack.io' }

?}

}

allprojects {?

?repositories {?

?// google()?

?// jcenter()

?maven { url 'http://maven.aliyun.com/nexus/content/repositories/google' }

?maven { url 'http://maven.aliyun.com/nexus/content/repositories/jcenter' }

?maven { url 'https://jitpack.io' }?

?maven { url "https://storage.googleapis.com/download.flutter.io" }

?}//這句是為了解決io.flutter異常問題}

這樣可以提高運(yùn)行編譯速度，也解決了io.flutter異常問題