添加架构组件

项目 build.gradle

allprojects {
    repositories {
        jcenter()
        // Add this if you use Gradle 4.0+
        google()
        // Add this if you use Gradle < 4.0
        maven { url 'https://maven.google.com' }
    }
}

ext {
    archVersion = '1.0.0-alpha5'
}

应用程序构建 gradle

// For Lifecycles, LiveData, and ViewModel
compile "android.arch.lifecycle:runtime:$archVersion"
compile "android.arch.lifecycle:extensions:$archVersion"
annotationProcessor "android.arch.lifecycle:compiler:$archVersion"

// For Room
compile "android.arch.persistence.room:runtime:$archVersion"
annotationProcessor "android.arch.persistence.room:compiler:$archVersion"

// For testing Room migrations
testCompile "android.arch.persistence.room:testing:$archVersion"

// For Room RxJava support
compile "android.arch.persistence.room:rxjava2:$archVersion"