Android使用gRPC

首先需要配置Android studio对protobuf的支持

参考资料

https://blog.csdn.net/Dream_go888/article/details/80092991
https://plugins.gradle.org/plugin/com.google.protobuf#new-plugin-mechanism-info-body

https://github.com/google/protobuf-gradle-plugin

第一步，添加protobuf-gradle-plugin插件

参考https://github.com/google/protobuf-gradle-plugin，在项目根目录build.gradle里添加

buildscript {   repositories {     mavenCentral()   }   dependencies {     classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.5'   } }

完整示例如下

// Top-level build file where you can add configuration options common to all sub-projects/modules.  buildscript {      repositories {         google()         jcenter()         //yuyong-->https://github.com/google/protobuf-gradle-plugin         mavenCentral()     }     dependencies {         classpath 'com.android.tools.build:gradle:3.1.2'         // NOTE: Do not place your application dependencies here; they belong         // in the individual module build.gradle files         // yuyong-->https://github.com/google/protobuf-gradle-plugin         classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.5'     } }  allprojects {     repositories {         google()         jcenter()     } }  task clean(type: Delete) {     delete rootProject.buildDir }

同步项目

第二步，对app模块进行配置，使之支持protobuf

在app模块下build.gradle里添加：

插件配置

apply plugin: 'com.google.protobuf'

指明proto文件位置

    sourceSets {         main {             proto {                 srcDir 'src/main/proto'             }         }     }

定义protoc编译（实际上就是根据proto生成java或者C++代码文件）规则

protobuf {     protoc {         artifact = 'com.google.protobuf:protoc:3.5.1-1'     }     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 {}             }         }     }     generatedFilesBaseDir = "$projectDir/src/generated" }

添加相关Java库支持（如果需要支持C++，需要添加C++库的支持）

    implementation 'com.google.protobuf:protobuf-java:3.5.1'     implementation 'com.google.protobuf:protoc:3.5.1-1'

完整示例如下

apply plugin: 'com.android.application' apply plugin: 'com.google.protobuf'  android {     compileSdkVersion 27     defaultConfig {         applicationId "com.thinking.client"         minSdkVersion 15         targetSdkVersion 27         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'             }         }     } } protobuf {     protoc {         artifact = 'com.google.protobuf:protoc:3.5.1-1'     }     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 {}             }         }     }     generatedFilesBaseDir = "$projectDir/src/generated" }  dependencies {     implementation fileTree(dir: 'libs', include: ['*.jar'])     implementation 'com.android.support:appcompat-v7:27.1.1'     implementation 'com.android.support.constraint:constraint-layout:1.1.0'     testImplementation 'junit:junit:4.12'     androidTestImplementation 'com.android.support.test:runner:1.0.2'     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'      implementation 'com.google.protobuf:protobuf-java:3.5.1'     implementation 'com.google.protobuf:protoc:3.5.1-1' }

同步，rebuild

至此，Android Studio完整了对protobuf的支持。

下面参考https://grpc.io/docs/quickstart/android.html创建一个test.proto文件

// Copyright 2015, gRPC Authors // All rights reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at //  //     http://www.apache.org/licenses/LICENSE-2.0 //  // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. syntax = "proto3";  option java_multiple_files = true; option java_package = "com.thinking.client"; option java_outer_classname = "HelloWorldProto"; option objc_class_prefix = "HLW";  package helloworld;  // The greeting service definition. service Greeter {   // Sends a greeting   rpc SayHello (HelloRequest) returns (HelloReply) {} }  // The request message containing the user's name. message HelloRequest {   string name = 1; }  // The response message containing the greetings message HelloReply {   string message = 1; } 

rebuild

可以看到在$projectDir/src/generated下可以看到由test.proto文件生成的Java和C++代码文件。

文章来源: Android使用gRPC