releaseInfo.gradle

import groovy.xml.MarkupBuilder
ext{
    versionFile = file('releases.xml')
    if (!versionFile.exists()) {
        versionFile.createNewFile()
    }
}
this.afterEvaluate { Project project ->
    def buildTask = project.tasks.getByName('build')
    buildTask.dependsOn('writeInfoTask')
    buildTask.doLast {
        println 'do last now'
//        writeInfoTask.execute()
    }
}
task writeInfoTask {
    inputs.property('versionName',rootProject.ext.versionName)
    inputs.property('versionCode',rootProject.ext.versionCode)
    inputs.property('versionInfo',rootProject.ext.versionInfo)
    outputs.file versionFile
    doLast {
        def versions = inputs.getProperties()
        File file = outputs.getFiles().getSingleFile()
        VersionManager versionMsg = new VersionManager(versions)
        //将实体写入到xml文件中
        StringWriter sw = new StringWriter()
        def builder = new MarkupBuilder(sw)
        if (file.text != null && file.text.size() <= 0) {
            //没有版本内容
            builder.releases{
                release {
                    versionCode(versionMsg.versionCode)
                    versionName(versionMsg.versionName)
                    versionInfo(versionMsg.versionInfo)
                }
            }
            file.withWriter {
                it.append(sw.toString())
            }
        }else {
            //已有其它版本内容
            builder.release {
                versionCode(versionMsg.versionCode)
                versionName(versionMsg.versionName)
                versionInfo(versionMsg.versionInfo)
            }
            //插入到最后一行前面
            def lines = file.readLines()
            def lengths = lines.size() - 1
            file.withWriter {
                lines.eachWithIndex { String entry, int index ->
                    if(index != lengths){
                        file.append(entry+'\r\n')
                    }else {
                        file.append('\r\r\n' + sw.toString() + '\r\n')
                        file.append(lines.get(lengths))
                    }
                }
            }
        }
    }
}

class VersionManager {
    def versionName
    def versionCode
    def versionInfo
}

task readInfoTask {
    inputs.file versionFile
    doLast {
        File file = inputs.getFiles().getSingleFile()
        println file.text
    }
}

task taskZ {
    dependsOn writeInfoTask, readInfoTask
    doLast {
        println '输入输出任务结束'
    }
}