android.support已死，androidx当立——弃用

前言

androidx 是对 android.support.xxx 包的整理后产物。由于之前的support包过于混乱，所以，google推出了 androidX。

自support v7:28.+开始，大部分support包都会迁移到androidx下，，所以建议开发者们尽早将项目转移到androidx下

迁移步骤

2.使用Android Studio自动迁移

在菜单栏中依次进入Refactor > Migrate to AndroidX，之后as会提示备份项目，如果已备份就不用勾选备份选项。

AS截图

迁移完成之后，gradle.properties里会多出这两行

android.useAndroidX=true
android.enableJetifier=true

如果你的项目中没有使用任何三方依赖，那么android.enableJetifier可以设置为false

3. 旧依赖包名与新包名对照表（建议使用Ctrl + F搜索）

执行Migrate to AndroidX完成之后，虽然常用的support包都会被转成对应的androidx里的包名，但还是依然有部分包名未能转换成功，这时候需要我们手动修改。

原包名	新包名
android.arch.core:common	androidx.arch.core:core-common
android.arch.core:core	androidx.arch.core:core
android.arch.core:core-testing	androidx.arch.core:core-testing
android.arch.core:runtime	androidx.arch.core:core-runtime
android.arch.lifecycle:common	androidx.lifecycle:lifecycle-common
android.arch.lifecycle:common-java8	androidx.lifecycle:lifecycle-common-java8
android.arch.lifecycle:compiler	androidx.lifecycle:lifecycle-compiler
android.arch.lifecycle:extensions	androidx.lifecycle:lifecycle-extensions
android.arch.lifecycle:livedata	androidx.lifecycle:lifecycle-livedata
android.arch.lifecycle:livedata-core	androidx.lifecycle:lifecycle-livedata-core
android.arch.lifecycle:reactivestreams	androidx.lifecycle:lifecycle-reactivestreams
android.arch.lifecycle:runtime	androidx.lifecycle:lifecycle-runtime
android.arch.lifecycle:viewmodel	androidx.lifecycle:lifecycle-viewmodel
android.arch.paging:common	androidx.paging:paging-common
android.arch.paging:runtime	androidx.paging:paging-runtime
android.arch.paging:rxjava2	androidx.paging:paging-rxjava2
android.arch.persistence.room:common	androidx.room:room-common
android.arch.persistence.room:compiler	androidx.room:room-compiler
android.arch.persistence.room:guava	androidx.room:room-guava
android.arch.persistence.room:migration	androidx.room:room-migration
android.arch.persistence.room:runtime	androidx.room:room-runtime
android.arch.persistence.room:rxjava2	androidx.room:room-rxjava2
android.arch.persistence.room:testing	androidx.room:room-testing
android.arch.persistence:db	androidx.sqlite:sqlite
android.arch.persistence:db-framework	androidx.sqlite:sqlite-framework
com.android.support.constraint:constraint-layout	androidx.constraintlayout:constraintlayout
com.android.support.constraint:constraint-layout-solver	androidx.constraintlayout:constraintlayout-solver
com.android.support.test.espresso.idling:idling-concurrent	androidx.test.espresso.idling:idling-concurrent
com.android.support.test.espresso.idling:idling-net	androidx.test.espresso.idling:idling-net
com.android.support.test.espresso:espresso-accessibility	androidx.test.espresso:espresso-accessibility
com.android.support.test.espresso:espresso-contrib	androidx.test.espresso:espresso-contrib
com.android.support.test.espresso:espresso-core	androidx.test.espresso:espresso-core
com.android.support.test.espresso:espresso-idling-resource	androidx.test.espresso:espresso-idling-resource
com.android.support.test.espresso:espresso-intents	androidx.test.espresso:espresso-intents
com.android.support.test.espresso:espresso-remote	androidx.test.espresso:espresso-remote
com.android.support.test.espresso:espresso-web	androidx.test.espresso:espresso-web
com.android.support.test.janktesthelper:janktesthelper	androidx.test.jank:janktesthelper
com.android.support.test.services:test-services	androidx.test:test-services
com.android.support.test.uiautomator:uiautomator	androidx.test.uiautomator:uiautomator
com.android.support.test:monitor	androidx.test:monitor
com.android.support.test:orchestrator	androidx.test:orchestrator
com.android.support.test:rules	androidx.test:rules
com.android.support.test:runner	androidx.test:runner
com.android.support:animated-vector-drawable	androidx.vectordrawable:vectordrawable-animated
com.android.support:appcompat-v7	androidx.appcompat:appcompat
com.android.support:asynclayoutinflater	androidx.asynclayoutinflater:asynclayoutinflater
com.android.support:car	androidx.car:car
com.android.support:cardview-v7	androidx.cardview:cardview
com.android.support:collections	androidx.collection:collection
com.android.support:coordinatorlayout	androidx.coordinatorlayout:coordinatorlayout
com.android.support:cursoradapter	androidx.cursoradapter:cursoradapter
com.android.support:customtabs	androidx.browser:browser
com.android.support:customview	androidx.customview:customview
com.android.support:design	com.google.android.material:material:1.0.0-rc01
com.android.support:documentfile	androidx.documentfile:documentfile
com.android.support:drawerlayout	androidx.drawerlayout:drawerlayout
com.android.support:exifinterface	androidx.exifinterface:exifinterface
com.android.support:gridlayout-v7	androidx.gridlayout:gridlayout
com.android.support:heifwriter	androidx.heifwriter:heifwriter
com.android.support:interpolator	androidx.interpolator:interpolator
com.android.support:leanback-v17	androidx.leanback:leanback
com.android.support:loader	androidx.loader:loader
com.android.support:localbroadcastmanager	androidx.localbroadcastmanager:localbroadcastmanager
com.android.support:media2	androidx.media2:media2:1.0.0-alpha03
com.android.support:media2-exoplayer	androidx.media2:media2-exoplayer
com.android.support:mediarouter-v7	androidx.mediarouter:mediarouter
com.android.support:multidex	androidx.multidex:multidex
com.android.support:multidex-instrumentation	androidx.multidex:multidex-instrumentation
com.android.support:palette-v7	androidx.palette:palette
com.android.support:percent	androidx.percentlayout:percentlayout
com.android.support:preference-leanback-v17	androidx.leanback:leanback-preference
com.android.support:preference-v14	androidx.legacy:legacy-preference-v14
com.android.support:preference-v7	androidx.preference:preference
com.android.support:print	androidx.print:print
com.android.support:recommendation	androidx.recommendation:recommendation
com.android.support:recyclerview-selection	androidx.recyclerview:recyclerview-selection
com.android.support:recyclerview-v7	androidx.recyclerview:recyclerview
com.android.support:slices-builders	androidx.slice:slice-builders
com.android.support:slices-core	androidx.slice:slice-core
com.android.support:slices-view	androidx.slice:slice-view
com.android.support:slidingpanelayout	androidx.slidingpanelayout:slidingpanelayout
com.android.support:support-annotations	androidx.annotation:annotation
com.android.support:support-compat	androidx.core:core
com.android.support:support-content	androidx.contentpager:contentpager
com.android.support:support-core-ui	androidx.legacy:legacy-support-core-ui
com.android.support:support-core-utils	androidx.legacy:legacy-support-core-utils
com.android.support:support-dynamic-animation	androidx.dynamicanimation:dynamicanimation
com.android.support:support-emoji	androidx.emoji:emoji
com.android.support:support-emoji-appcompat	androidx.emoji:emoji-appcompat
com.android.support:support-emoji-bundled	androidx.emoji:emoji-bundled
com.android.support:support-fragment	androidx.fragment:fragment
com.android.support:support-media-compat	androidx.media:media
com.android.support:support-tv-provider	androidx.tvprovider:tvprovider
com.android.support:support-v13	androidx.legacy:legacy-support-v13
com.android.support:support-v4	androidx.legacy:legacy-support-v4
com.android.support:support-vector-drawable	androidx.vectordrawable:vectordrawable
com.android.support:swiperefreshlayout	androidx.swiperefreshlayout:swiperefreshlayout
com.android.support:textclassifier	androidx.textclassifier:textclassifier
com.android.support:transition	androidx.transition:transition
com.android.support:versionedparcelable	androidx.versionedparcelable:versionedparcelable
com.android.support:viewpager	androidx.viewpager:viewpager
com.android.support:wear	androidx.wear:wear
com.android.support:webkit	androidx.webkit:webkit

参考 https://developer.android.com/topic/libraries/support-library/refactor
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