1.在flutter android目录下建立key.properties

storePassword=
keyPassword=
keyAlias=book
storeFile=key/bookkey.jks 

2.在flutter android app下建立key目录 并将key文件复制到app下key目录

3.修改flutter-> android-> app-> build.gradle在

android
{

下

signingConfigs {
        release {
            keyAlias 'book'
            keyPassword 'your password'
            storeFile file('key/bookkey.jks')
            storePassword 'your password'
        }
    }
    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.release
        }
    }

4.在终端flutter项目目录下执行

flutter build apk --no-sound-null-safety

5.打包apk时设置版本号在pubspec.yaml中version