grpc1.45.2/examples/android/helloworld/app/build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "io.grpc.android.cpp.helloworldexample"
        minSdkVersion 21
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                // The paths to the protoc and grpc_cpp_plugin binaries on the host system (codegen
                // is not cross-compiled to Android)
                def protoc = project.hasProperty('protoc') ?
                        project.property('protoc') : '/usr/local/bin/protoc'
                def grpc_cpp_plugin = project.hasProperty('grpc_cpp_plugin') ?
                        project.property('grpc_cpp_plugin') : '/usr/local/bin/grpc_cpp_plugin'

                cppFlags "-std=c++14 -frtti -fexceptions"
                arguments '-DANDROID_STL=c++_static'
                arguments '-DRUN_HAVE_POSIX_REGEX=0'
                arguments '-DRUN_HAVE_STD_REGEX=0'
                arguments '-DRUN_HAVE_STEADY_CLOCK=0'
                arguments '-Dprotobuf_BUILD_PROTOC_BINARIES=off'
                arguments '-DgRPC_BUILD_CODEGEN=off'
                arguments '-Dhelloworld_PROTOBUF_PROTOC_EXECUTABLE=' + protoc
                arguments '-Dhelloworld_GRPC_CPP_PLUGIN_EXECUTABLE=' + grpc_cpp_plugin
            }
        }
        ndk.abiFilters 'x86'
    }
    buildTypes {
        debug {
            minifyEnabled false
        }
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}