在 Android 中使用 RPC 的标准方法是什么？

import io.grpc.*;

public class MyGrpcService extends gRPC.ManagedChannelProvider {
    public MyGrpcService() {
        super(ChannelCredentials.create(
                "localhost:50051",
                Credentials.fromCertificate(
                        "cert.pem",
                        "password"
                )
        ));
    }
}

public class MyGrpc {
    private static final String SERVICE_NAME = "mygrpc";
    private static final String PROTOCOL_NAME = "mygrpc";
    private static final ChannelCredentials CHANNEL_CREDENTIALS =
            Credentials.fromCertificate(
                    "cert.pem",
                    "password"
            );

    public static void main(String[] args) {
        ManagedChannel channel = ManagedChannelBuilder.forAddress("localhost", 50051)
                .usePlaintext()
                .build();

        MyGrpc.MyGrpcStub stub = MyGrpc.newStub(channel);

        MyRequest request = MyRequest.newBuilder()
                .setUsername("user1")
                .setPassword("password1")
                .build();

        stub.myMethod(request, new StreamObserver<MyResponse>() {
            @Override
            public void onNext(MyResponse response) {
                System.out.println(response.getMessage());
            }

            @Override
            public void onError(Throwable t) {}

            @Override
            public void onCompleted() {}
        });
    }
}