Develop Reference

How to generate gRPC code with protobuf on Kotlin for Android client?

I created a gRPC server (hosted by AWS) in nodejs and I can connect to it with a nodejs client implementation from my local machine.
I'm using the com.google.protobuf plugin to auto generate code from my .proto file.
My gradle sync works and the app builds successfully but I can't find the generated code classes.
I'm struggling to find a good implementation example for a Kotlin for Android gRPC client but I followed these articles:
gRPC In Kotlin(Android)
Java Basic Tutorial
My app/src/main/protos/responder.proto file
syntax = "proto3";
option java_package = "protos.grpc";
package responder;
message ConnectionRequest {
int32 userId = 2;
}
message ConnectionResponse {
string response = 1;
}
service ResponderService {
rpc responderConnect (stream ConnectionRequest) returns (stream ConnectionResponse) {};
}
Project build.gradle
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext {
kotlin_version = '1.3.72'
protobufPluginVersion = '0.8.6'
grpcVersion = '1.12.0'
protocVersion = '3.2.0'
}
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.6.3'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath "com.google.protobuf:protobuf-gradle-plugin:$protobufPluginVersion"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
def nav_version = "2.2.2"
classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
}
}
allprojects {
repositories {
google()
jcenter()
maven { url "https://jitpack.io" }
mavenCentral()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
And my app's build.gradle
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'com.google.protobuf'
android {
compileSdkVersion 29
buildToolsVersion "29.0.3"
defaultConfig {
applicationId "organisation.responder.two"
minSdkVersion 19
targetSdkVersion 29
versionCode 31
versionName "2.0"
multiDexEnabled true
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = "1.8"
}
}
dependencies {
...
implementation 'io.grpc:grpc-okhttp:1.30.0'
implementation 'io.grpc:grpc-protobuf-lite:1.30.0'
implementation 'io.grpc:grpc-stub:1.30.0'
implementation 'io.grpc:grpc-core:1.30.0'
compileOnly 'org.apache.tomcat:annotations-api:6.0.53'
def multidex_version = "2.0.1"
implementation "androidx.multidex:multidex:$multidex_version"
}
protobuf {
protoc {
artifact = "com.google.protobuf:protoc:3.12.0"
}
plugins {
javalite {
artifact = "com.google.protobuf:protoc-gen-javalite:3.0.0"
}
grpc {
artifact = "io.grpc:protoc-gen-grpc-java:1.30.0"
}
}
generateProtoTasks {
all().each { task ->
task.builtins {
remove java
}
task.plugins {
javalite {}
grpc {
// Options added to --grpc_out
option 'lite'
}
}
}
}
}
As I said above, the gradle sync is successful and the project builds successfully. But where is the autogenerated code?

After following this build.gradle file as an example, I managed to generate the grpc code using the gradle protobuf plugin.
Major changes to my app level build.gradle file included:
Adding path to .proto file in sourceSets block under android block.
android {
...
sourceSets {
main {
proto {
srcDir 'src/main/protos' <-- path to .proto file
}
}
}
}
Change the protobuf block in app level build.gradle file
protobuf {
protoc {
artifact = "com.google.protobuf:protoc:3.12.0"
}
plugins {
grpc {
artifact = "io.grpc:protoc-gen-grpc-java:1.30.0"
}
}
generateProtoTasks {
all().each { task ->
task.builtins {
remove javanano
java {
option 'lite'
}
}
task.plugins {
grpc {
// Options added to --grpc_out
option 'lite'
}
}
}
}
}
After a successful sync and build, the generated code files where located under app/build/generated/source/proto/debug/grpc/protos/grpc/ResponderServiceGrpc.java and app/build/generated/source/proto/debug/java/protos/grpc/Responder.java

Android Build Gradle giving complie() error

I am facing this error for a long time now..
Error:(24, 0) Could not find method compile() for arguments
[com.google.code.gson:gson:2.3] on object of type
org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.
My root build.gradle is
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
//apply plugin: 'com.android.application'
//
//android {
// compileSdkVersion 23
// buildToolsVersion '23.0.0'
//}
And my module/build.gradle is
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.0"
defaultConfig {
applicationId "com.example.zumoappname"
minSdkVersion 7
targetSdkVersion 17
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
repositories {
flatDir {
dirs 'aars'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.google.code.gson:gson:2.3'
compile 'com.google.guava:guava:18.0'
compile 'com.squareup.okhttp:okhttp:2.5.0'
compile 'com.microsoft.azure:azure-mobile-android:3.1.0'
compile (group: 'com.microsoft.azure', name: 'azure-notifications-handler', version: '1.0.1', ext: 'jar')
}
Could somebody please direct me in the correct direction..
And before this I received a similar error for "android method"..
I googled a lot but was not of much use.
Thanks in advance:)

It seems that your file has some issue.
The structure should be:
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.0"
defaultConfig { ... }
buildTypes {
release {...}
}
}
repositories { .. }
dependencies {
//..
}
Move the repositories block outside the android block.

Android Studio and protobuf Error:(7, 0) Plugin with id 'com.google.protobuf' not found

I want to use grpc in Android Studio, but failed in gradle setting.
my gradle plugin version is 2.1.2. I have installed gradle 2.14.
In my app\build.gradle file:
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
apply plugin: "com.google.protobuf"
defaultConfig {
applicationId "com.example.test.test_20"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
debug {
debuggable true
jniDebuggable true
}
}
buildscript {
repositories {
maven {
mavenCentral()
}
}
dependencies {
classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.0"
}
}
protobuf {
protoc {
// The version of protoc must match protobuf-java. If you don't depend on
// protobuf-java directly, you will be transitively depending on the
// protobuf-java version that grpc depends on.
artifact = "com.google.protobuf:protoc:3.0.0"
}
plugins {
grpc {
artifact = 'io.grpc:protoc-gen-grpc-java:1.0.0'
}
}
generateProtoTasks {
all()*.plugins {
grpc {}
}
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
compile 'io.grpc:grpc-okhttp:1.0.0'
compile 'io.grpc:grpc-protobuf-lite:1.0.0'
compile 'io.grpc:grpc-stub:1.0.0'
}
Gradle sync message output is
Error:(7, 0) Plugin with id 'com.google.protobuf' not found.
What is wrong in my setting?
I create a new empty project, and app/build.gradle file:
apply plugin: 'com.android.application'
apply plugin: "com.google.protobuf"
buildscript {
repositories {
maven {
//mavenCentral()
url 'https://repo1.maven.org/maven2'
}
}
dependencies {
classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.0"
}
}
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "com.example.test.testprotobuf"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.android.support:design:23.4.0'
}
And gradle-wrapper.properties file:
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.12-all.zip
I excute "gradlew build" command successfully.
And sync gradle, it prompt that “Error:(2, 0) Cause: org/gradle/api/internal/file/collections/DefaultDirectoryFileTreeFactory
” 。

Something wrong in your build.gradle. You have to move some parts:
apply plugin: 'com.android.application'
apply plugin: "com.google.protobuf"
buildscript {
repositories {
maven {
mavenCentral()
}
}
dependencies {
classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.0"
}
}
android {
}

you must add the following code in the build.gradle(the project's build.gradle, not the app's):
buildscript {
repositories {
jcenter()
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.3'
// for gRPC
classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.0"
}}

Error:(19, 0) Gradle DSL method not found: 'android()' not solved

I have the problem:
Error:(19, 0) Gradle DSL method not found: 'android()'
-The project 'x' may be using a version of gradle thet does not contais the method
Open gradle wrapper file
-The build file may be missing a gradle plugin
Apply gradle plugin
build.gradle:
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:1.5.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
android {
buildToolsVersion '23.0.0'
}
dependencies {
}
app.gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 22
buildToolsVersion "23.0.0 rc3"
compileOptions {
encoding "UTF-8"
}
defaultConfig {
applicationId "es.albertoramos.pfcalbertoramos"
minSdkVersion 15
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.2.1'
}
How fix this problem?

Delete:
android {
buildToolsVersion '23.0.0'
}
dependencies {
}
from your top-level build.gradle.

Android Studio could not find any version that matches come.google.maps

My gradle seems to be complaining that it Could not find any version that matches com.google.maps.android:android-maps-utils:+.
Gradle:
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:0.11.+'
}
}
apply plugin: 'android'
android {
compileSdkVersion 19
buildToolsVersion '19.1.0'
lintOptions {
abortOnError false
}
defaultConfig {
minSdkVersion 11
targetSdkVersion 19
}
signingConfigs {
}
buildTypes {
release {
signingConfig signingConfigs.release
}
}
productFlavors {
}
}
dependencies {
compile 'com.google.android.gms:play-services:4.+'
compile 'com.android.support:support-v4:19.1.+'
compile 'com.google.maps.android:android-maps-utils:+'
compile project(':libraries:facebook')
compile files('libs/YouTubeAndroidPlayerApi.jar')
compile files('libs/libGoogleAnalyticsServices.jar')
compile files('libs/svg-android.jar')
}

you havn't declared a repository for your project, just for the buildscript stuff.
try adding a first level repository block
repositories {
jcenter()
}