为什么 Android Studio 3.2.1 中的新项目模板不使用 AndroidX 库?

Why a new project templates in Android Studio 3.2.1 does not use the AndroidX libraries?

Google 说

"We recommend using the AndroidX libraries in all new projects. You should also consider migrating existing projects to AndroidX as well." source

但是 Android Studio 3.2.1 仍然会创建一个新的项目模板,这些模板受历史 "android.support.*" 库的支持。

为什么?

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.developer.myapplication"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.android.support:support-vector-drawable:28.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

直到 Android Studio 3.3 或更高(目前仍然是 Preview/Beta)。

如果您使用它创建一个新项目,您会发现这个 Use AndroidX artifacts 选项。然后一旦创建,你会发现依赖项默认为 androidx.*