[英]Communication through gRPC/Protobuf
I am coming because I can't make work my communication between my API (Go) and my client (Android). 我之所以来是因为无法进行API(Go)和客户端(Android)之间的通信。
I have this protobuf file: 我有这个protobuf文件:
syntax = "proto3";
option java_package = "com.emixam23.rushpoc.protobuf";
option java_outer_classname = "HelloWorld";
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;
}
The protobuf file comes from the example of https://grpc.io/docs/quickstart/go.html , I just didn't implemented the SayHelloAgain. protobuf文件来自https://grpc.io/docs/quickstart/go.html的示例,我只是没有实现SayHelloAgain。 What i am trying to achieve is, from my android app, SayHello to my Go API and get a reply... 我想要实现的是,从我的Android应用程序SayHello到我的Go API并获得回复...
For android, I followed that tutorial ( https://grpc.io/docs/quickstart/android.html ) in order to, from the protobuf file, to communicate with my API. 对于android系统,我遵循了该教程( https://grpc.io/docs/quickstart/android.html ),以便从protobuf文件中与我的API通信。 However, there is a stub
, comming from I don't know where. 但是,有一个stub
,不知道从哪里来。
So I searched about how to create a stub ( https://grpc.io/docs/tutorials/basic/android.html ) and nothing.. ManagedChannelBuilder doesn't exist and I can't find the way to install it.. 因此,我搜索了如何创建存根( https://grpc.io/docs/tutorials/basic/android.html ),一无所有。ManagedChannelBuilder不存在,我找不到安装它的方法。
PS: to generate my Java class from the protobuf file, I followed that tutorial: https://proandroiddev.com/how-to-setup-your-android-app-to-use-protobuf-96132340de5c PS:要从protobuf文件生成Java类,我遵循了该教程: https : //proandroiddev.com/how-to-setup-your-android-app-to-use-protobuf-96132340de5c
Am I in the right direction or totally wrong? 我是朝正确的方向还是完全错误的方向?
My project structure: 我的项目结构:
APP build.gradle
APP build.gradle
apply plugin: 'com.android.application'
apply plugin: 'com.google.protobuf'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.rushpoc.emixam23.androidapp"
minSdkVersion 21
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'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
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'
//Protobuf
implementation 'com.google.protobuf:protobuf-lite:3.0.0'
implementation 'io.grpc:grpc-okhttp:1.13.2'
implementation 'io.grpc:grpc-protobuf-lite:1.13.2'
implementation 'io.grpc:grpc-stub:1.13.2'
}
protobuf {
generatedFilesBaseDir = "$projectDir/generated"
protoc {
// You still need protoc like in the non-Android case
artifact = 'com.google.protobuf:protoc:3.0.0'
}
plugins {
javalite {
// The codegen for lite comes as a separate artifact
artifact = 'com.google.protobuf:protoc-gen-javalite:3.0.0'
}
grpc {
artifact = 'io.grpc:protoc-gen-grpc-java:1.13.2'
}
}
generateProtoTasks {
all().each { task ->
task.builtins {
java
}
task.plugins {
grpc {}
}
}
}
}
TOP-LEVEL/Root build.gradle
build.gradle
级别/根 build.gradle
// Top-level build file where you can add configuration options common to all sub-projects/modules. //顶层构建文件,您可以在其中添加所有子项目/模块共有的配置选项。
buildscript {
ext.protobufVersion = '0.8.6'
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.1.3'
classpath "com.google.protobuf:protobuf-gradle-plugin:$protobufVersion"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
I haven't checked the entire gradle files yet but I see in your screenshot the .proto file was in src/main/protobufs
, which was not following either of the tutorials you mentioned. 我还没有检查整个gradle文件,但是我在您的屏幕快照中看到.proto文件位于src/main/protobufs
,该文件没有遵循您提到的任何一个教程。 The protobuf gradle plugin does not detect this directory by default. 默认情况下,protobuf gradle插件不会检测到此目录。 Therefore I suggest you change it into the default directory src/main/proto
. 因此,我建议您将其更改为默认目录src/main/proto
。 If you would like to insist putting the .proto file in src/main/protobufs
, you might need let the protobuf gradle plugin know it by adding 如果您想坚持将.proto文件放在src/main/protobufs
,则可能需要通过添加来让protobuf gradle插件知道它
// see https://github.com/google/protobuf-gradle-plugin#customizing-source-directories
sourceSets {
main {
proto {
// In addition to the default 'src/main/proto'
srcDir 'src/main/protobufs'
}
}
}
After that, the protobuf gradle plugin will generate the java code if there's no other mistake. 之后,如果没有其他错误,protobuf gradle插件将生成Java代码。
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