android studio Kotlin中使用 GRPC和protobuf 出现一些问题总结

Kotlin中配置 GRPC和protobuf 出现一些问题总结如下：

• 3rd-party Gradle plug-ins may be the cause

• Codegen plugin grpc not defined
  Execution failed for task ‘:app:generateDebugProto’. > Codegen plugin javalite not defined

• io.grpc.StatusRuntimeException: UNIMPLEMENTED: Method not found

---

android studio运行不起来首先要找到打印出来的日志

1. 出现log信息

2. 查看详细Log信息

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看看第一个问题

3rd-party Gradle plug-ins may be the cause

The com.google.protobuf plugin was already applied to the project: :app and will not be applied again after plugin: android
useNewCruncher has been deprecated. It will be removed in a future version of the gradle plugin. New cruncher is now always enabled.

CONFIGURE SUCCESSFUL in 0s

第二个问题

Codegen plugin grpc not defined

Executing tasks: [:app:generateDebugSources]

Configuration on demand is an incubating feature.
The com.google.protobuf plugin was already applied to the project: :app and will not be applied again after plugin: android
useNewCruncher has been deprecated. It will be removed in a future version of the gradle plugin. New cruncher is now always enabled.
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:checkDebugManifest UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:extractDebugProto UP-TO-DATE
:app:extractIncludeDebugProto UP-TO-DATE
:app:extractProto UP-TO-DATE
:app:generateDebugProto
A problem was found with the configuration of task ':app:generateDebugProto'. Registering invalid inputs and outputs via TaskInputs and TaskOutputs methods has been deprecated and is scheduled to be removed in Gradle 5.0.
 - Directory '/Volumes/Document/MT5/Flashlight/app/build/extracted-include-protos/main' specified for property '$3' does not exist.
:app:generateDebugProto FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:generateDebugProto'.
> Codegen plugin grpc not defined

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 0s
9 actionable tasks: 1 executed, 8 up-to-date

源码如下

//https://github.com/rouzwawi/grpc-kotlin
protobuf {
    protoc { artifact = 'com.google.protobuf:protoc:3.5.1-1' }
    plugins {
        javalite { artifact = "com.google.protobuf:protoc-gen-javalite:3.0.0" }
        //增加grpc插件
        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.13.1' // CURRENT_GRPC_VERSION
        }
    }
    generateProtoTasks {
        all().each { task ->
            task.plugins {
                javalite {}
                grpc { // Options added to --grpc_out
                    option 'lite' }
            }
        }
    }
}

第三个问题

Client Error: io.grpc.StatusRuntimeException: UNKNOWN

详细解决办法 https://github.com/grpc/grpc-java/issues/2624