1.添加jks相关配置

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test.properties

KEYSTORE_FILE=../key/test.jks
KEYSTORE_PASSWORD= 123456
KEY_ALIAS=a
KEY_PASSWORD=123456

注意这里使用的相对路径

build.gradle

//加载签名配置的文件
Properties props = new Properties()
props.load(new FileInputStream(file("../key/test.properties")))
android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.sevenday.mytest"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }

    signingConfigs {
        release {
            keyAlias props['KEY_ALIAS']
            keyPassword props['KEY_PASSWORD']
            storePassword props['KEYSTORE_PASSWORD']
            v1SigningEnabled true
            v2SigningEnabled true
            storeFile file(props['KEYSTORE_FILE'])
        }
    }

    buildTypes {
        debug {
            signingConfig signingConfigs.release
        }
        release {
            minifyEnabled false
            signingConfig signingConfigs.release
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'


        }
    }

}

2.打包方式

默认方式

按照第一步配置就可以打包了
1.使用工具栏中build方式

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2.直接使用gradle中task的build任务

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结果：在默认文件夹中生成apk

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修改包名

在默认方式中，我们一般会添加修改包名的方式

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release {
            minifyEnabled false
            signingConfig signingConfigs.release
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'


            applicationVariants.all { variant  ->
                if (variant.buildType.name.equals('release')) {
                    variant.outputs.all { output ->
                        def buildName = "Downloader"
                        def type = variant.buildType.name
                        def releaseApkName = buildName + '_' + type + "_" + versionName  + '.apk'
                        outputFileName = releaseApkName

                    }
                }
            }


        }

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修改包名，修改保存路径

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 release {
            minifyEnabled false
            signingConfig signingConfigs.release
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'


            applicationVariants.all { variant  ->
                if (variant.buildType.name.equals('release')) {
                    variant.outputs.all { output ->
                        def buildName = "Downloader"
                        def type = variant.buildType.name
                        def releaseApkName = buildName + '_' + type + "_" + versionName  + '.apk'
                        outputFileName = releaseApkName
                        variant.packageApplication.outputDirectory = new File("./apk")
                    }
                }
            }


        }

使用task任务移动apk

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/// **********************移动文件*************************
build {
    doLast {
        def outFileDir = "../out";
        FileTree tree = fileTree(dir: './build/outputs/apk/')
        tree.include '**/app-*.apk'
        tree.exclude '**/output.json'
        // 遍历文件树
        println "projectDir=$projectDir rootDir=$rootDir buildDir=$buildDir"
        tree.each {File file ->
            if (file.name.startsWith("app-")&&file.name.endsWith(".apk")) {
                println file.absolutePath
//                def fileName=""
//                def fileName=outFileDir + "/vspn_v${android.defaultConfig.versionName}_v${android.defaultConfig.versionCode}_${releaseTime}_Build${buildSerialNumber}"
                def fileName=outFileDir + "/test_v${android.defaultConfig.versionName}_v${android.defaultConfig.versionCode}"

                if (file.name.contains("debug")){
                    fileName+="_debug"
                }
                fileName+=".apk"
                //file.renameTo(fileName)
                copy {
                    from file
                    into outFileDir
                    rename {
                        String srcFileName ->fileName
                    }
                }
            }
        }
        println("=====================build.doLast success.=========================")
    }
}

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只是移动打包好的apk文件，并改名

参考：
gradle 指定导出包的名字和路径

安卓Gradle脚本实现自动打包后复制一份APK文件，并修改APK名称，到指定目录作备份