一、前言
在Google I/O 2018上，Android團隊宣佈了AndroidX。它是Android團隊用於在Jetpack中開發，測試，打包，版本和發佈庫的開源項目。與support庫一樣，每個AndroidX庫都與Android操作系統分開提供，並提供跨Android版本的向後兼容性。
androidx 是對 android.support.xxx 包和其他google android支持庫整理後的產物。由於之前的support包過於混亂，所以，google推出了 AndroidX。自support v7:28開始，大部分support包都會遷移到androidx下，所以建議開發者們儘早將項目轉移到androidx下。
二、遷移步驟
1.先備份項目！
2.使用Android Studio自動遷移
在菜單欄中依次進入Refactor > Migrate to AndroidX，之後as會提示備份項目，如果已備份就不用勾選備份選項。
3. 舊依賴包名與新包名對照表（建議使用Ctrl + F搜索）
執行Migrate to AndroidX完成之後，雖然常用的support包都會被轉成對應的androidx裡的包名，gradle或者maven裡的部分依賴但還是有可能會未能轉換成功，這時候需要我們手動修改。
原包名新包名
android.arch.core:commonandroidx.arch.core:core-common
android.arch.core:coreandroidx.arch.core:core
android.arch.core:core-testingandroidx.arch.core:core-testing
android.arch.core:runtimeandroidx.arch.core:core-runtime
android.arch.lifecycle:commonandroidx.lifecycle:lifecycle-common
android.arch.lifecycle:common-java8androidx.lifecycle:lifecycle-common-java8
android.arch.lifecycle:compilerandroidx.lifecycle:lifecycle-compiler
android.arch.lifecycle:extensionsandroidx.lifecycle:lifecycle-extensions
android.arch.lifecycle:livedataandroidx.lifecycle:lifecycle-livedata
android.arch.lifecycle:livedata-coreandroidx.lifecycle:lifecycle-livedata-core
android.arch.lifecycle:reactivestreamsandroidx.lifecycle:lifecycle-reactivestreams
android.arch.lifecycle:runtimeandroidx.lifecycle:lifecycle-runtime
android.arch.lifecycle:viewmodelandroidx.lifecycle:lifecycle-viewmodel
android.arch.paging:commonandroidx.paging:paging-common
android.arch.paging:runtimeandroidx.paging:paging-runtime
android.arch.paging:rxjava2androidx.paging:paging-rxjava2
android.arch.persistence.room:commonandroidx.room:room-common
android.arch.persistence.room:compilerandroidx.room:room-compiler
android.arch.persistence.room:guavaandroidx.room:room-guava
android.arch.persistence.room:migrationandroidx.room:room-migration
android.arch.persistence.room:runtimeandroidx.room:room-runtime
android.arch.persistence.room:rxjava2androidx.room:room-rxjava2
android.arch.persistence.room:testingandroidx.room:room-testing
android.arch.persistence:dbandroidx.sqlite:sqlite
android.arch.persistence:db-frameworkandroidx.sqlite:sqlite-framework
com.android.support.constraint:constraint-layoutandroidx.constraintlayout:constraintlayout
com.android.support.constraint:constraint-layout-solverandroidx.constraintlayout:constraintlayout-solver
com.android.support.test.espresso.idling:idling-concurrentandroidx.test.espresso.idling:idling-concurrent
com.android.support.test.espresso.idling:idling-netandroidx.test.espresso.idling:idling-net
com.android.support.test.espresso:espresso-accessibilityandroidx.test.espresso:espresso-accessibility
com.android.support.test.espresso:espresso-contribandroidx.test.espresso:espresso-contrib
com.android.support.test.espresso:espresso-coreandroidx.test.espresso:espresso-core
com.android.support.test.espresso:espresso-idling-resourceandroidx.test.espresso:espresso-idling-resource
com.android.support.test.espresso:espresso-intentsandroidx.test.espresso:espresso-intents
com.android.support.test.espresso:espresso-remoteandroidx.test.espresso:espresso-remote
com.android.support.test.espresso:espresso-webandroidx.test.espresso:espresso-web
com.android.support.test.janktesthelper:janktesthelperandroidx.test.jank:janktesthelper
com.android.support.test.services:test-servicesandroidx.test:test-services
com.android.support.test.uiautomator:uiautomatorandroidx.test.uiautomator:uiautomator
com.android.support.test:monitorandroidx.test:monitor
com.android.support.test:orchestratorandroidx.test:orchestrator
com.android.support.test:rulesandroidx.test:rules
com.android.support.test:runnerandroidx.test:runner
com.android.support:animated-vector-drawableandroidx.vectordrawable:vectordrawable-animated
com.android.support:appcompat-v7androidx.appcompat:appcompat
com.android.support:asynclayoutinflaterandroidx.asynclayoutinflater:asynclayoutinflater
com.android.support:carandroidx.car:car
com.android.support:cardview-v7androidx.cardview:cardview
com.android.support:collectionsandroidx.collection:collection
com.android.support:coordinatorlayoutandroidx.coordinatorlayout:coordinatorlayout
com.android.support:cursoradapterandroidx.cursoradapter:cursoradapter
com.android.support:customtabsandroidx.browser:browser
com.android.support:customviewandroidx.customview:customview
com.android.support:designcom.google.android.material:material
com.android.support:documentfileandroidx.documentfile:documentfile
com.android.support:drawerlayoutandroidx.drawerlayout:drawerlayout
com.android.support:exifinterfaceandroidx.exifinterface:exifinterface
com.android.support:gridlayout-v7androidx.gridlayout:gridlayout
com.android.support:heifwriterandroidx.heifwriter:heifwriter
com.android.support:interpolatorandroidx.interpolator:interpolator
com.android.support:leanback-v17androidx.leanback:leanback
com.android.support:loaderandroidx.loader:loader
com.android.support:localbroadcastmanagerandroidx.localbroadcastmanager:localbroadcastmanager
com.android.support:media2androidx.media2:media2:1.0.0-alpha03
com.android.support:media2-exoplayerandroidx.media2:media2-exoplayer
com.android.support:mediarouter-v7androidx.mediarouter:mediarouter
com.android.support:multidexandroidx.multidex:multidex
com.android.support:multidex-instrumentationandroidx.multidex:multidex-instrumentation
com.android.support:palette-v7androidx.palette:palette
com.android.support:percentandroidx.percentlayout:percentlayout
com.android.support:preference-leanback-v17androidx.leanback:leanback-preference
com.android.support:preference-v14androidx.legacy:legacy-preference-v14
com.android.support:preference-v7androidx.preference:preference
com.android.support:printandroidx.print:print
com.android.support:recommendationandroidx.recommendation:recommendation
com.android.support:recyclerview-selectionandroidx.recyclerview:recyclerview-selection
com.android.support:recyclerview-v7androidx.recyclerview:recyclerview
com.android.support:slices-buildersandroidx.slice:slice-builders
com.android.support:slices-coreandroidx.slice:slice-core
com.android.support:slices-viewandroidx.slice:slice-view
com.android.support:slidingpanelayoutandroidx.slidingpanelayout:slidingpanelayout
com.android.support:support-annotationsandroidx.annotation:annotation
com.android.support:support-compatandroidx.core:core
com.android.support:support-contentandroidx.contentpager:contentpager
com.android.support:support-core-uiandroidx.legacy:legacy-support-core-ui
com.android.support:support-core-utilsandroidx.legacy:legacy-support-core-utils
com.android.support:support-dynamic-animationandroidx.dynamicanimation:dynamicanimation
com.android.support:support-emojiandroidx.emoji:emoji
com.android.support:support-emoji-appcompatandroidx.emoji:emoji-appcompat
com.android.support:support-emoji-bundledandroidx.emoji:emoji-bundled
com.android.support:support-fragmentandroidx.fragment:fragment
com.android.support:support-media-compatandroidx.media:media
com.android.support:support-tv-providerandroidx.tvprovider:tvprovider
com.android.support:support-v13androidx.legacy:legacy-support-v13
com.android.support:support-v4androidx.legacy:legacy-support-v4
com.android.support:support-vector-drawableandroidx.vectordrawable:vectordrawable
com.android.support:swiperefreshlayoutandroidx.swiperefreshlayout:swiperefreshlayout
com.android.support:textclassifierandroidx.textclassifier:textclassifier
com.android.support:transitionandroidx.transition:transition
com.android.support:versionedparcelableandroidx.versionedparcelable:versionedparcelable
com.android.support:viewpagerandroidx.viewpager:viewpager
com.android.support:wearandroidx.wear:wear
com.android.support:webkitandroidx.webkit:webkit
如有其他未列出的依賴，請參考 https://developer.android.google.cn/topic/libraries/support-library/refactor
原文鏈接：https://blog.csdn.net/yin_ol/article/details/89421390
