Android Studio配置protobuf插件自动生成Ja

配置Gradle

1、项目的build.gradle文件加入：

 classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.0'

如果使用的是Build Gradle3.0及以上的版本，会和protobuf-gradle-plugin插件有冲突，将protobuf-gradle-plugin升级到0.8.2版本。

classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.2'

image.png

2、模块的build.gradle

• 顶部添加protobuf插件

apply plugin: 'com.google.protobuf'

• android结点增加proto文件位置配置

  sourceSets {
        main {
            proto {
                srcDir 'src/main/proto'
                include '**/*.proto'
            }
            java {
                srcDir 'src/main/java'
            }
        }
    }

• 添加依赖

implementation 'com.google.protobuf:protobuf-lite:3.0.0'

• 增加protobuf结点

protobuf {
    protoc {
        artifact = 'com.google.protobuf:protoc:3.1.0'
    }
    plugins {
        javalite {
            // The codegen for lite comes as a separate artifact
            artifact = 'com.google.protobuf:protoc-gen-javalite:3.1.0'
        }
    }
    generateProtoTasks {
        all().each { task ->
            task.plugins {
                javalite {}
            }
        }
    }
    generatedFilesBaseDir = "$projectDir/src/generated"
}

目录结构

image.png

附

apply plugin: 'com.android.application'
apply plugin: 'com.google.protobuf'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.0"
    defaultConfig {
        applicationId "com.ydtf.nbmobile.protobufdemo4"
        minSdkVersion 16
        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:appcompat-v7:25.0.1'
    testCompile 'junit:junit:4.12'
    implementation 'com.google.protobuf:protobuf-lite:3.0.0'
}

protobuf {
    protoc {
        artifact = 'com.google.protobuf:protoc:3.1.0'
    }
    plugins {
        javalite {
            // The codegen for lite comes as a separate artifact
            artifact = 'com.google.protobuf:protoc-gen-javalite:3.1.0'
        }
    }
    generateProtoTasks {
        all().each { task ->
            task.plugins {
                javalite {}
            }
        }
    }
    generatedFilesBaseDir = "$projectDir/src/generated"
}

Gradle3语法变动

gradle3中compile和testCompile变成implementation和testImplementation。

参考：
在Android Studio配置google protobuf
Android Studio3.0之后gradle.build中dependencie依赖由compile变为implementation