如何在build.gradle自定义和调用方法，实例（打包时自动加时间）

原文：https://blog.csdn.net/yzwfeng/article/details/83184514

一、设置build.gradle打包时自动加时间

在build.gradle中添加以下函数：

def releaseTime() {
  return new Date().format("yyyyMMddHHmm", TimeZone.getTimeZone("GMT+08:00"))
}

 引用这个函数：
def fileName = "SecyrityPassDemo_${defaultConfig.versionName}_${releaseTime()}_${variant.productFlavors[0].name}.apk"
以下是一个完整的build.gradle文件

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.2"
    defaultConfig {
        applicationId "com.pci.securigydemotest"
        minSdkVersion 19
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    signingConfigs {
        release {
            storeFile file("/APP_Keystore/keyless.keystore")   //签名文件全路径
            storePassword "123456"
            keyAlias "keyless.keystore"
            keyPassword "123456"
        }
    }

    applicationVariants.all { variant ->
    variant.outputs.each { output ->
        def outputFile = output.outputFile
        if (outputFile != null && outputFile.name.endsWith('.apk')) {
            // 输出apk名称为Pos_v1.0.0_201709251000_.apk

            def fileName = "SecyrityPassDemo_${defaultConfig.versionName}_${releaseTime()}_${variant.productFlavors[0].name}.apk"

            output.outputFile = new File(outputFile.parent, fileName)
        }
    }
}

productFlavors {
    Beta {
        manifestPlaceholders = [UMENG_CHANNEL_VALUE: "Beta"]
    }
}
    }

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

    repositories {
        flatDir {
            dirs 'libs'
        }
    }
}

android {
      lintOptions {
          abortOnError false
      }
  }

def releaseTime() {
  return new Date().format("yyyyMMddHHmm", TimeZone.getTimeZone("GMT+08:00"))
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.0.0-alpha1'
    compile(name: 'security-release', ext: 'aar')
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'


}

参考文章：

https://bbs.csdn.net/topics/392286998?page=1

官方文档有说明，定义string必须带引号

buildConfigField 'String', 'versionDateTime', "\""+releaseTime()+"\""

或者

buildConfigField "String", "versionDateTime", "\"${releaseTime()}\""