Android Studio和protobuf错误：（7，0）找不到ID为'com.google.protobuf'的插件

Question

我想在Android Studio中使用grpc，但在gradle设置中失败。

我的gradle插件版本是2.1.2。 我已经安装了gradle 2.14。

在我的app \\ build.gradle文件中：

    apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    apply plugin: "com.google.protobuf"

    defaultConfig {
        applicationId "com.example.test.test_20"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"

    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            debuggable true
            jniDebuggable true
        }
    }

    buildscript {
        repositories {
            maven {
                mavenCentral()
            }
        }
        dependencies {
            classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.0"
        }
    }


    protobuf {
        protoc {
            // The version of protoc must match protobuf-java. If you don't depend on
            // protobuf-java directly, you will be transitively depending on the
            // protobuf-java version that grpc depends on.
            artifact = "com.google.protobuf:protoc:3.0.0"
        }
        plugins {
            grpc {
                artifact = 'io.grpc:protoc-gen-grpc-java:1.0.0'
            }
        }
        generateProtoTasks {
            all()*.plugins {
                grpc {}
            }
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile 'io.grpc:grpc-okhttp:1.0.0'
    compile 'io.grpc:grpc-protobuf-lite:1.0.0'
    compile 'io.grpc:grpc-stub:1.0.0'
}

Gradle同步消息输出为错误：（7，0）找不到ID为'com.google.protobuf'的插件。

我的设置有什么问题？

我创建一个新的空项目，然后创建app / build.gradle文件：

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

buildscript {
    repositories {
        maven {
            //mavenCentral()
            url 'https://repo1.maven.org/maven2'
        }
    }
    dependencies {
        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.0"
    }
}

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.example.test.testprotobuf"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.android.support:design:23.4.0'
}

和gradle-wrapper.properties文件：

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.12-all.zip

我成功执行了“ gradlew build”命令。 并同步gradle，它提示“错误：（2，0）原因：org / gradle / api / internal / file / collections / DefaultDirectoryFileTreeFactory”。

Answer 1

您必须在build.gradle（项目的build.gradle，而不是应用程序的）中添加以下代码：

buildscript {
repositories {
    jcenter()
    mavenCentral()
}
dependencies {
    classpath 'com.android.tools.build:gradle:2.2.3'
    // for gRPC
    classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.0" 
}}

Answer 2

您的build.gradle中出了点问题。 您必须移动一些部分：

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

   buildscript {
        repositories {
            maven {
                mavenCentral()
            }
        }
        dependencies {
            classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.0"
        }
    }

   android {

   }