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将Android组件库添加到项目Adding Components to your Project

艾米吖 2022-08-23 阅读 199


Adding Components to your Project


Architecture Components are available from Google's Maven repository. To use them, follow these steps:

Add the Google Maven repository

Android Studio projects aren't configured to access this repository by default.

To add it to your project, open the ​​build.gradle​​ file for your project (not the ones for your app or module) and add the highlighted line as shown below:

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

Add Architecture Components

Open the ​​build.gradle​​ file for your app or module and add the artifacts that you need as dependencies. You can add all dependencies, or choose a subset.Note: For Kotlin based apps, make sure you use ​​kapt​​ instead of ​​annotationProcessor​​. You should also add the ​​kotlin-kapt​

Main Dependencies

Includes ​​Lifecycles​​​, ​​LiveData​​​, ​​ViewModel​​​, ​​Room​​​, and ​​Paging​​.

It also includes test helpers for testing LiveData as well as ​​testing Room migrations​​.

dependencies {
// ViewModel and LiveData
implementation "android.arch.lifecycle:extensions:1.1.1"
// alternatively, just ViewModel
implementation "android.arch.lifecycle:viewmodel:1.1.1"
// alternatively, just LiveData
implementation "android.arch.lifecycle:livedata:1.1.1"

annotationProcessor "android.arch.lifecycle:compiler:1.1.1"

// Room (use 1.1.0-beta3 for latest beta)
implementation "android.arch.persistence.room:runtime:1.0.0"
annotationProcessor "android.arch.persistence.room:compiler:1.0.0"

// Paging
implementation "android.arch.paging:runtime:1.0.0-rc1"

// Test helpers for LiveData
testImplementation "android.arch.core:core-testing:1.1.1"

// Test helpers for Room
testImplementation "android.arch.persistence.room:testing:1.0.0"
}

Java 8 Support for Lifecycles

If your app uses Java 8, we recommend using this library instead of ​​android.arch.lifecycle:compiler​​.

dependencies {
// Java8 support for Lifecycles
implementation "android.arch.lifecycle:common-java8:1.1.1"
}

Optional Dependencies for RxJava and ReactiveStreams

Adds optional support for ​​Room RxJava​​ and LiveData ReactiveStreams.

dependencies {
// RxJava support for Room (use 1.1.0-beta3 for latest beta)
implementation "android.arch.persistence.room:rxjava2:1.0.0"

// ReactiveStreams support for LiveData
implementation "android.arch.lifecycle:reactivestreams:1.1.1"

// RxJava support for Paging
implementation "android.arch.paging:rxjava2:1.0.0-alpha1"
}

Optional Dependencies for Guava

Adds support for Guava's ​​Optional​​ and ​​ListenableFuture​​ types in Room ​​@Dao​

dependencies {
// Guava support for Room
implementation "android.arch.persistence.room:guava:1.1.0-beta3"
}

Alternative import for lightweight Lifecycles only

Support library depends on this lightweight import. It provides Lifecycles without LiveData or ViewModel.

dependencies {
// Lifecycles only (no ViewModel or LiveData)
implementation "android.arch.lifecycle:runtime:1.1.1"
annotationProcessor "android.arch.lifecycle:compiler:1.1.1"
}

For more information, see ​​Add Build Dependencies​​.


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