Using GRPC and protobuf in Android studio Kotlin

 gRPC Java now provides development and usage support for Kotlin projects built with Gradle.

//Three core packages for adding grpc
    // You need to build grpc-java to obtain these libraries below.
    implementation "io.grpc:grpc-okhttp:$CURRENT_GRPC_VERSION" // CURRENT_GRPC_VERSION   1.14.0-SNAPSHOT
    implementation "io.grpc:grpc-protobuf-lite:$CURRENT_GRPC_VERSION" // CURRENT_GRPC_VERSION
    implementation "io.grpc:grpc-stub:$CURRENT_GRPC_VERSION" // CURRENT_GRPC_VERSION

Kotlin is a modern statically typed language developed by Jet Brains for JVM and Android. Kotlin programs are usually easy to interoperate with existing Java libraries.

//Add protobuf-gradle-plugin
 classpath "com.google.protobuf:protobuf-gradle-plugin:$protobufGP_version""

* The following example illustrates how to use Ko

tlin configures projects for JVM applications and Android applications. *

build.gradle configuration in the app directory of the project

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'com.google.protobuf'

android {
    compileSdkVersion 28

    defaultConfig {
        applicationId "io.grpc.helloworldexample"
        // API level 14+ is required for TLS since Google Play Services v10.2
        minSdkVersion 14
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        debug { minifyEnabled false }
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    lintOptions {
        disable 'GoogleAppIndexingWarning', 'HardcodedText', 'InvalidPackage'
        textReport true
        textOutput "stdout"
    }
    // Android Studio 3.1 does not automatically pick up '<src_set>/kotlin' as source input
    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
        main.java.srcDirs += 'src/test/kotlin'
        androidTest.java.srcDirs += 'src/androidTest/kotlin'
    }

    lintOptions {
        // Do not complain about outdated deps, so that this can javax.annotation-api can be same
        // as other projects in this repo. Your project is not required to do this, and can
        // upgrade the dep.
        disable 'GradleDependency'
        // The Android linter does not correctly detect resources used in Kotlin.
        // See:
        //   - https://youtrack.jetbrains.com/issue/KT-7729
        //   - https://youtrack.jetbrains.com/issue/KT-12499
        disable 'UnusedResources'
        textReport true
        textOutput "stdout"
    }
}

protobuf {
    protoc { artifact = 'com.google.protobuf:protoc:3.5.1-1' }
    plugins {
        javalite { artifact = "com.google.protobuf:protoc-gen-javalite:3.0.0" }
        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.13.1' // CURRENT_GRPC_VERSION
        }
    }
    generateProtoTasks {
        all().each { task ->
            task.plugins {
                javalite {}
                grpc { // Options added to --grpc_out
                    option 'lite' }
            }
        }
    }
}
def  CURRENT_GRPC_VERSION='1.13.1'
dependencies {
    implementation 'com.android.support:appcompat-v7:28.+'
    implementation 'javax.annotation:javax.annotation-api:1.2'
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

    //Three core packages using grpc
    // You need to build grpc-java to obtain these libraries below.
    implementation "io.grpc:grpc-okhttp:$CURRENT_GRPC_VERSION" // CURRENT_GRPC_VERSION   1.14.0-SNAPSHOT
    implementation "io.grpc:grpc-protobuf-lite:$CURRENT_GRPC_VERSION" // CURRENT_GRPC_VERSION
    implementation "io.grpc:grpc-stub:$CURRENT_GRPC_VERSION" // CURRENT_GRPC_VERSION
}

repositories { mavenCentral() }

build.gradle configuration in the project application directory

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.2.51'
    repositories {
        google()
        jcenter()
        mavenLocal()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.3'
        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.6"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        mavenLocal()
    }
}

Reference address: https://github.com/grpc/grpc-java

demo download address: https://download.csdn.net/download/jeff_yaojie/10520064