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1

新建文件

新建key.properties
app/android/key.properties
key.properties在android文件下。和android/app同级

文件中的代码

storePassword=123456
keyPassword=123456
keyAlias=key0
storeFile=/Users/.../app/android/xxx.jks

storePassword=新建xxx.jks文件时的密码
keyPassword=新建xxx.jks文件时的密码
keyAlias=新建xxx.jks文件时的Alias
storeFile=新建xxx.jks文件的绝对路径

2

文件中添加代码

app/android/app/build.gradle

第一行添加

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

android {
compileSdkVersion 29
上边添加

def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}
android {
    compileSdkVersion 29
}

defaultConfig {}
后天添加

defaultConfig {}
signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
            storePassword keystoreProperties['storePassword']
        }
    }