在build.gradle中添加如下代码

    release {
            //自定义包名输出格式
            applicationVariants.all { variant ->
                variant.outputs.each { output ->
                    def outputFile = output.outputFile
                    if (outputFile != null && outputFile.name.endsWith('.apk')) {
                        // 输出apk名称为MyApp-V1.0.0-20180201.apk
                        def fileName = "MyApp"+ "-V" + defaultConfig.versionName + "-" 
                  + new Date().format("yyyyMMdd", TimeZone.getTimeZone("UTC")) +".apk";
                        output.outputFile = new File(outputFile.parent, fileName)
                    }
                }
            }
        }

生命不息，奋斗不止