【译】Google官方推出的Android架构组件系列文章（二）将Architecture Components引入工程

PS: 2018.06.24按照官网最新文档更新本文翻译

系列文章导航：

【译】Google官方推出的Android架构组件系列文章（一）App架构指南
【译】Google官方推出的Android架构组件系列文章（二）将Architecture Components引入工程
【译】Google官方推出的Android架构组件系列文章（三）处理生命周期
【译】Google官方推出的Android架构组件系列文章（四）LiveData
【译】Google官方推出的Android架构组件系列文章（五）ViewModel
【译】Google官方推出的Android架构组件系列文章（六）Room持久化库

原文地址：https://developer.android.com/topic/libraries/architecture/adding-components.html

Architecture Components可以从Google的Maven仓库获得。按照下面的几个步骤来使用：

添加Google Maven仓库

Android Studio默认没有配置成可访问这个仓库。

要把它加到你的工程里，需要打开工程的根build.gradle文件（不是app或模块的那个），然后添加下面高亮的那行：

allprojects {    repositories {        jcenter()        google()        //maven { url 'https://maven.google.com' }    }}

注意：https://maven.google.com 国内可能访问不通，可尝试替换为 https://dl.google.com/dl/android/maven2/

声明依赖

打开你的app或者模块的build.gradle文件，添加你需要的库作为依赖。你可以添加所有依赖，或者取一个子集。

AndroidX

架构组件的未来版本正作为AndroidX的一部分来进行开发，并且列在每个稳定依赖下。alpha版本的库名字已经遵循AndroidX的标准发生了变更。

有关AndroidX重构的更多信息，以及其如何影响类包和模块ID，请参阅AndroidX重构文档

Kotlin

某些标记有// use -ktx for Kotlin的AndroidX依赖库支持Kotlin扩展模块，只需要将下面的

implementation "androidx.lifecycle:lifecycle-viewmodel:$lifecycle_version" // use -ktx for Kotlin

替换成

implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"

更多信息，包括kotlin扩展文档，请参考ktx文档

注意：对于基于kotlin的应用，请使用kapt代替annotationProcessor，你也需要添加kotlin-kapt插件。

Lifecycle

对于 Lifecycle的依赖，包括LiveData和ViewModel

dependencies {    def lifecycle_version = "1.1.1"    // ViewModel and LiveData    implementation "android.arch.lifecycle:extensions:$lifecycle_version"    // alternatively - just ViewModel    implementation "android.arch.lifecycle:viewmodel:$lifecycle_version" // use -ktx for Kotlin    // alternatively - just LiveData    implementation "android.arch.lifecycle:livedata:$lifecycle_version"    // alternatively - Lifecycles only (no ViewModel or LiveData).    //     Support library depends on this lightweight import    implementation "android.arch.lifecycle:runtime:$lifecycle_version"    annotationProcessor "android.arch.lifecycle:compiler:$lifecycle_version"    // alternately - if using Java8, use the following instead of compiler    implementation "android.arch.lifecycle:common-java8:$lifecycle_version"    // optional - ReactiveStreams support for LiveData    implementation "android.arch.lifecycle:reactivestreams:$lifecycle_version"    // optional - Test helpers for LiveData    testImplementation "android.arch.core:core-testing:$lifecycle_version"}

AndroidX

dependencies {    def lifecycle_version = "2.0.0-alpha1"    // ViewModel and LiveData    implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"    // alternatively - just ViewModel    implementation "androidx.lifecycle:lifecycle-viewmodel:$lifecycle_version" // use -ktx for Kotlin    // alternatively - just LiveData    implementation "androidx.lifecycle:lifecycle-livedata:$lifecycle_version"    // alternatively - Lifecycles only (no ViewModel or LiveData). Some UI    //     AndroidX libraries use this lightweight import for Lifecycle    implementation "androidx.lifecycle:lifecycle-runtime:$lifecycle_version"    annotationProcessor "androidx.lifecycle:lifecycle-compiler:$lifecycle_version"    // alternately - if using Java8, use the following instead of lifecycle-compiler    implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"    // optional - ReactiveStreams support for LiveData    implementation "androidx.lifecycle:lifecycle-reactivestreams:$lifecycle_version" // use -ktx for Kotlin    // optional - Test helpers for LiveData    testImplementation "androidx.arch.core:core-testing:$lifecycle_version"}

Room

对于Room的依赖，包括testing Room migrations 和Room RxJava

dependencies {    def room_version = "1.1.1"    implementation "android.arch.persistence.room:runtime:$room_version"    annotationProcessor "android.arch.persistence.room:compiler:$room_version"    // optional - RxJava support for Room    implementation "android.arch.persistence.room:rxjava2:$room_version"    // optional - Guava support for Room, including Optional and ListenableFuture    implementation "android.arch.persistence.room:guava:$room_version"    // Test helpers    testImplementation "android.arch.persistence.room:testing:$room_version"}

AndroidX

dependencies {    def room_version = "2.0.0-alpha1"    implementation "androidx.room:room-runtime:$room_version"    annotationProcessor "androidx.room:room-compiler:$room_version"    // optional - RxJava support for Room    implementation "androidx.room:room-rxjava2:$room_version"    // optional - Guava support for Room, including Optional and ListenableFuture    implementation "androidx.room:room-guava:$room_version"    // Test helpers    testImplementation "androidx.room:room-testing:$room_version"}

Paging

针对Paging的依赖

dependencies {    def paging_version = "1.0.0"    implementation "android.arch.paging:runtime:$paging_version"    // alternatively - without Android dependencies for testing    testImplementation "android.arch.paging:common:$paging_version"    // optional - RxJava support, currently in release candidate    implementation "android.arch.paging:rxjava2:1.0.0-rc1"}

AndroidX

dependencies {    def paging_version = "2.0.0-alpha1"    implementation "androidx.paging:paging-runtime:$paging_version"    // alternatively - without Android dependencies for testing    testImplementation "androidx.paging:paging-common:$paging_version"    // optional - RxJava support    implementation "androidx.paging:paging-rxjava2:$paging_version"}

Navigation

针对Navigation的依赖。

Navigation已经在androidx.navigation包中，但目前依赖于Support Library 27.1.1和相关的Arch组件版本。AndroidX版本的Navigation版本将在未来发布。

dependencies {    def nav_version = "1.0.0-alpha02"    implementation "android.arch.navigation:navigation-fragment:$nav_version" // use -ktx for Kotlin    implementation "android.arch.navigation:navigation-ui:$nav_version" // use -ktx for Kotlin    // optional - Test helpers    androidTestImplementation "android.arch.navigation:navigation-testing:$nav_version" // use -ktx for Kotlin}

Safe args
针对 Safe args，将下面的classpath添加到你的顶级build.gradle文件中

buildscript {    repositories {        google()    }    dependencies {        classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:1.0.0-alpha02"    }}

然后在应用或模块的build.gradle文件中添加：

apply plugin: "androidx.navigation.safeargs"

WorkManager

针对 WorkManager的依赖。

WorkManager类已经在androidx.work package包中，但目前依赖于Support Library 27.1.1和相关的Arch组件版本。AndroidX版本的WorkManager版本将在未来发布。

dependencies {    def work_version = "1.0.0-alpha03"    implementation "android.arch.work:work-runtime:$work_version" // use -ktx for Kotlin    // optional - Firebase JobDispatcher support    implementation "android.arch.work:work-firebase:$work_version"    // optional - Test helpers    androidTestImplementation "android.arch.work:work-testing:$work_version"}

更多信息，参见 Add Build Dependencies

添加Google Maven仓库

声明依赖

AndroidX

Kotlin

Lifecycle

Room

Paging

Navigation

WorkManager

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