It looks like gradle is trying to compile before it runs the proto compiler. I suspect it's more complex than this, but my first guess would be to reverse the two plugins at the top of the file:

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

from java-docs-samples.

Thanks @ricmalta. @qingdaofu1 Can you also take a look at our Android samples which are up now https://github.com/GoogleCloudPlatform/android-docs-samples/tree/master/speech/Speech

from java-docs-samples.

the app build.gradle is
apply plugin: 'com.android.application'
apply plugin: 'com.google.protobuf'

android {
compileSdkVersion 24
buildToolsVersion "24.0.0"
defaultConfig {
applicationId "com.amrobotics.googlespeech"
minSdkVersion 15
targetSdkVersion 24
versionCode 1
versionName "1.0"
}
sourceSets {
main {
proto {
srcDir 'src/main/proto/google/api'
srcDir 'src/main/proto/google/logging'
srcDir 'src/main/proto/google/longrunning'
srcDir 'src/main/proto/google/rpc'
srcDir 'src/main/proto/google/speech'
srcDir 'src/main/proto/google/type'
}
java {
srcDir 'src/main/java'
}
}
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
// compileOptions {
// sourceCompatibility = JavaVersion.VERSION_1_7
// targetCompatibility = JavaVersion.VERSION_1_7
// }

// https://github.com/square/okio/issues/58
lintOptions {
    disable 'InvalidPackage', 'HardcodedText'
    textReport true
    textOutput "stdout"
}

}

protobuf {
protoc {
artifact = 'com.google.protobuf:protoc:3.0.0-alpha-3'
}
plugins {
grpc {
artifact = 'io.grpc:protoc-gen-grpc-java:0.15.0'
}
}
generateProtoTasks {
all().each { task ->
task.builtins {
// Javanano is installed by default, but needs to be removed to use protobuf lite..
remove javanano
java {
// Options added to --java_out
option 'lite'
}
}

        task.plugins {
            grpc {
                // Options added to --grpc_out
                option 'lite'
            }
        }
    }
}

}

dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
testCompile 'junit:junit:4.12'
compile 'javax.annotation:javax.annotation-api:1.2'
compile 'com.android.support:appcompat-v7:24.1.0'
compile 'io.grpc:grpc-netty:0.15.0'
compile 'io.grpc:grpc-protobuf:0.15.0'
compile 'io.grpc:grpc-stub:0.15.0'
compile files('libs/grpc-grpclb-0.14.0.jar')
compile files('libs/grpc-protobuf-nano-0.14.0.jar')
compile files('libs/grpc-benchmarks-0.14.0.jar')
compile files('libs/grpc-interop-testing-0.14.0.jar')
compile files('libs/grpc-examples-0.14.0.jar')
compile files('libs/commons-cli-2.0.jar')
compile 'com.google.protobuf.nano:protobuf-javanano:3.0.0-alpha-2'
compile 'com.google.guava:guava:19.0'
//compile files('libs/commons-cli-1.2.jar')
compile files('libs/google-oauth-client-1.21.0.jar')
compile files('libs/commons-cli-1.3.1.jar')
}

the project build.gradle is

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
// mavenCentral()
// maven { url "https://plugins.gradle.org/m2/" }
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.2'
classpath 'com.google.protobuf:protobuf-gradle-plugin:0.7.7'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}

allprojects {
repositories {
jcenter()
mavenCentral()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}

from java-docs-samples.

@jerjou Any ideas here?

from java-docs-samples.

@qingdaofu1 Were you able to try above recommendations?

from java-docs-samples.

@qingdaofu1 have a look to an implementation I did for a simple demo.
I had some problems with the gradle configuration, mainly with a dependency on a legacy version of guava.
Its not bullet proof, but I'm get it working with android
https://github.com/Cloudoki/android-google-cloud-speech-api

from java-docs-samples.

@ricmalta Closing this issue since the link worked for you.

from java-docs-samples.

The solution is to place the following into your build.gradle file:

protobuf { protoc { artifact = "com.google.protobuf:protoc:3.0.0" } plugins { lite { artifact = "com.google.protobuf:protoc-gen-javalite:3.0.0" } } generateProtoTasks { all().each { task -> task.builtins { remove java } task.plugins { lite { } } } } }

from java-docs-samples.