Gradle file for gRPC and protobuf v1

build.gradle

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

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.vivekvinodh.protoexample"
        minSdkVersion 19
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

protobuf {
    protoc { artifact = 'com.google.protobuf:protoc:3.10.0' }
    plugins {
        javalite { artifact = "com.google.protobuf:protoc-gen-javalite:3.0.0" }
        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.25.0' // CURRENT_GRPC_VERSION
        }
    }
    generateProtoTasks {
        all().each { task ->
            task.plugins {
                javalite {}
                grpc { // Options added to --grpc_out
                    option 'lite' }
            }
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.core:core-ktx:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'

    api 'com.google.protobuf:protobuf-lite:3.0.1'
    api 'io.grpc:grpc-okhttp:1.25.0' // CURRENT_GRPC_VERSION
    api 'io.grpc:grpc-protobuf-lite:1.25.0' // CURRENT_GRPC_VERSION
    api 'io.grpc:grpc-stub:1.25.0' //
    api 'javax.annotation:javax.annotation-api:1.3.2'
}

Try compiling your Gradle with latest protobuf gradle plugin and protoc compiler, it may give you similar error reported in this thread - google/protobuf-gradle-plugin#315.

If you face the same error follow the solution discussed in above thread, it will the compilation errors.