Android 配置gradle实现VersionCode自增实例

def getVersionCode() {
 def versionFile = file('version.properties')
 if (versionFile.canRead()) {
  def Properties versionProps = new Properties()
  versionProps.load(new FileInputStream(versionFile))
  def versionCode = versionProps['VERSION_CODE'].toInteger()
  def runTasks = gradle.startParameter.taskNames //仅在assembleRelease任务是增加版本号,其他渠道包在此分别配置
  if ('assembleInsectRelease' in runTasks) {
   versionProps['VERSION_CODE'] = (++versionCode).toString()
   versionProps.store(versionFile.newWriter(), null)
  }
  return versionCode
 } else {
  throw new GradleException("Could not find version.properties!")
 }
}
android {
 ....
}

def currentVersionCode = getVersionCode()
 
 defaultConfig {
  applicationId 'com.chongzzz.texas'
  minSdkVersion 15
  targetSdkVersion 25
  multiDexEnabled true
  versionCode currentVersionCode
  versionName "1.0.1.21"
}

 flavorDimensions 'defaultDimension'
 productFlavors {
  alibaba { }
  tencent { }
 }

ext {
 alibabaDebug = 'alibabaDebug'
 alibabaRelease = 'alibabaRelease'
 tencentDebug = 'tencentDebug'
 tencentRelease = 'tencentRelease'
}

afterEvaluate {
 project.android.applicationVariants.all { variant ->
  // 最简单的方法
  variant.mergedFlavor.manifestPlaceholders = [APP_KEY: project."${variant.name}"]
 }
}

 flavorDimensions 'defaultDimension'
 productFlavors {
  alibaba { }
  tencent { }
 }

ext {
 alibabaDebug = 'alibabaDebug'
 alibabaRelease = 'alibabaRelease'
 tencentDebug = 'tencentDebug'
 tencentRelease = 'tencentRelease'
}

afterEvaluate {
 project.android.applicationVariants.all { variant ->
  // 自定义任务
  tasks.create("${variant.name}ManifestPlaceHolder", ManifestPlaceHolder) {
   current = variant
  }
  variant.outputs.first().processManifest.dependsOn "${variant.name}ManifestPlaceHolder"   }
}

class ManifestPlaceHolder extends DefaultTask {
 @Input
 def current

 @TaskAction
 def changeManifestPlaceHolder() {
  current.mergedFlavor.manifestPlaceholders = [APP_KEY: project."${current.name}"]
 }
}