【问题标题】:How do you include 'com.google.protobuf' on android project (gradle) as full but not as lite?您如何在 android 项目(gradle)中将“com.google.protobuf”包含为完整但不包含精简版?
【发布时间】:2018-03-01 07:47:02
【问题描述】:

我正在尝试使用 protobuf 生成的代码来解码来自网络的消息。我有一个 .proto 文件,看起来像这样:

syntax = "proto3";

message CanData {
  string id = 1; // name
  Data data1 = 2;
  Data data2 = 3;     
}
message Data {
    oneof data1 {
        int32 int_type = 2; // Magic and other int types
        float float_type = 3; // Timestamp and other float types
        uint32 unsigned_type = 4; // unsigned types
    }
}

当我使用 protoc 命令生成代码时。它成功地工作。但后来我打开了 android 项目,它没有按预期工作。我收到如下行的错误:

Error:(11, 26) error: cannot find symbol class ExtensionRegistry
Error:(1719, 43) error: package com.google.protobuf.GeneratedMessageV3 does not exist
Error:(1716, 55) error: package com.google.protobuf.Descriptors does not exist
Error:(1724, 43) error: package com.google.protobuf.GeneratedMessageV3 does not exist
Error:(1721, 55) error: package com.google.protobuf.Descriptors does not exist

还有很多错误。但为了简单明了,我没有使用它们。

然后查看互联网,我们遇到了一堆对我们不起作用的解决方案,例如我们在 build.gradle 中尝试做的事情:

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.4'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

还有 build.gradle(Module app)

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

android {
    compileSdkVersion 25
    defaultConfig {
        applicationId "oronos.oronosmobileapp"
        minSdkVersion 25
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:25.4.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.google.protobuf:protobuf-lite:3.0.0'
    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'
}

我认为精简版:

com.google.protobuf:protobuf-lite:3.0.0

不是我要找的,但我找不到解决方案。

【问题讨论】:

    标签: android android-ndk build.gradle protocol-buffers gradle-plugin


    【解决方案1】:

    在这里试试这个

    // https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java
    compile group: 'com.google.protobuf', name: 'protobuf-java', version: '3.5.1'
    

    compile 'com.google.protobuf:protobuf-java:3.5.1'
    

    你可以简单地用谷歌搜索https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java

    【讨论】:

    • 后来编译改为实现,但仍然可以解决构建错误: implementation 'com.google.protobuf:protobuf-java:3.5.1'
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