打包命令:flutter build apk
在Flutter工程的android/app下面的build.gradle可以修改包名、版本等信息
在app的build.gradle中配置:

signingConfigs {
        release {
            keyAlias 'keynamexxx'
            keyPassword 'xxxmima'
            storeFile rootProject.file('keynamexxx.jks')
            storePassword 'xxxmima'
        }
    }
    buildTypes {
        release {
            signingConfig signingConfigs.release
        }
    }