使用AndroidStudio处理Google Protobuf文件转Java文件

Google Protobuf文件转Java文件

Protobuf协议目前分两个版本 protobuf v3 与protobuf v2两个版本
项目中使用Protobuf作为数据传输，使用AndroidStudio工具批量编译protobuf文件比较简单。

开始配置环境
protobuf文件

option java_package = "com.daycodeday.test";option java_outer_classname = "MtmColWrapper";message MtmCol {optional    uint32      colnamelength           = 1;required    string      colname             = 2;optional    uint32      coltype             = 3;optional    uint32      coltypestringlength     = 4;optional    string      coltypestring           = 5;optional    uint32      length              = 6;optional    uint32      precision           = 7;optional    uint32      scale               = 8;optional    uint32      nullable            = 9;            }

项目根目录配置build.gradle

    dependencies {        classpath 'com.android.tools.build:gradle:2.3.3'        // protobuf支持版本        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.0'    }

modle根目录配置build.gradle

//依赖支持apply plugin: 'com.google.protobuf'

//指定文件目录  sourceSets {        main {            proto {             //main目录新建proto目录                srcDir 'src/main/proto'                include '**/*.proto'            }            java {                srcDir 'src/main/java'            }        }    }

//依赖库compile 'com.google.protobuf:protobuf-java:2.5.0'compile 'com.google.protobuf:protoc:2.5.0'

//构建taskprotobuf {    protoc {        artifact = 'com.google.protobuf:protoc:2.5.0'    }    generateProtoTasks {        all().each { task ->            task.builtins {                remove java            }            task.builtins {                java {}                // Add cpp output without any option.                // DO NOT omit the braces if you want this builtin to be added.                cpp {}            }        }    }    //生成目录    generatedFilesBaseDir = "$projectDir/src/generated"}

我使用依赖库是 2.5 ，如果是3.0以上依赖库的需要定义下协议头

3.0 头部开始加上syntax = "proto3";2.0 头部加上syntax = "proto2";

下面是完整的gradle文件

apply plugin: 'com.android.application'apply plugin: 'com.google.protobuf'android {    compileSdkVersion 25    buildToolsVersion "25.0.3"    defaultConfig {        applicationId "com.daycodeday.myapplication"        minSdkVersion 15        targetSdkVersion 25        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }    sourceSets {        main {            proto {                srcDir 'src/main/proto'                include '**/*.proto'            }            java {                srcDir 'src/main/java'            }        }    }}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.constraint:constraint-layout:1.0.2'    testCompile 'junit:junit:4.12'    compile 'com.google.protobuf:protobuf-java:3.1.0'    compile 'com.google.protobuf:protoc:3.1.0'}protobuf {    protoc {        artifact = 'com.google.protobuf:protoc:3.1.0'    }    generateProtoTasks {        all().each { task ->            task.builtins {                remove java            }            task.builtins {                java {}                // Add cpp output without any option.                // DO NOT omit the braces if you want this builtin to be added.                cpp {}            }        }    }    //生成目录    generatedFilesBaseDir = "$projectDir/src/generated"}