Emoji Compatibility | Android Developers

2024-10-20

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It also updates the necessary emoji metadata that the EmojiCompat support library needs to keep up with the latest versions of the Unicode specification. Platform AndroidStudio GooglePlay Jetpack Kotlin Docs Games Language English BahasaIndonesia Español–AméricaLatina Português–Brasil 中文–简体日本語 한국어 Signin Documentation Overview Guides Reference Samples Design&Quality Platform AndroidStudio GooglePlay Jetpack Kotlin Docs Overview Guides Reference Samples Design&Quality Games AppBasics Introduction BuildyourfirstappOverviewCreateanAndroidprojectRunyourappBuildasimpleuserinterfaceStartanotheractivity Appfundamentals AppresourcesOverviewHandleconfigurationchanges LocalizationLocalizeyourappTestyourappwithpseudolocalesUnicodeandinternationalizationsupportLanguageandlocaleresolutionComplexXMLresources ResourcetypesOverviewAnimationColorstatelistDrawableLayoutMenuStringStyleFontMoretypes AppmanifestfileOverview Devices DevicecompatibilityOverviewScreencompatibilityoverviewSupportdifferentpixeldensitiesSupportdisplaycutoutsDeclarerestrictedscreensupport 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AppfeedbackSendappfeedbacktoEMMsTestappfeedbackWorkcontactsDevicemanagementpolicies DevicemanagementOverviewBuildadevicepolicycontroller DedicateddevicesOverviewLocktaskmodeMultipleusersCookbookDevicecontrolNetworkingandtelephonySecuritySystemupdatesNetworkactivitylogging AndroidversionsOverviewAndroid12Android11Android10Android9Android8.0Android7.0Deviceadministration AndroidDevelopers Docs Guides EmojiCompatibility Caution:Asoflate2021,theandroidx.emoji:emoji libraryisdeprecatedinfavorofandroidx.emoji2:emoji2,which providesintegrationintoandroidx.appcompat. Tosupportmodernemojiandsimplifybackward-compatibilitywithlower versionsofAndroid,it'srecommendedthatyoumigratetothe androidx.emoji2:emoji2 library.Fordetailsonhowtoimplement,see Supportmodernemoji. TheEmojiCompatsupportlibraryaimsto keepAndroiddevicesuptodatewiththelatestemoji.Itpreventsyourapp fromshowingmissingemojicharactersintheformof☐,which indicatesthatyourdevicedoesnothaveafonttodisplaythetext.By usingtheEmojiCompatsupportlibrary, yourappusersdonotneedtowaitforAndroidOSupdatestogetthelatest emoji. Figure1.Emojicomparison Refertothefollowingrelatedresources: EmojiCompatibilitysampleapp Java|Kotlin HowdoesEmojiCompatwork? TheEmojiCompatsupportlibraryprovides classestoimplementbackward-compatibleemojisupportondevicesrunning Android4.4(APIlevel19)andhigher.Youcanconfigure EmojiCompatwitheitherbundledor downloadablefonts.Formoreinformationaboutconfiguration,refertothe followingsections: Downloadablefontsconfiguration Bundledfontsconfiguration EmojiCompatidentifiesemojiforagiven CharSequence,replacesthemwith EmojiSpans,ifrequired,and finallyrenderstheemojiglyphs.Figure2demonstratestheprocess. Figure2.EmojiCompatprocess Downloadablefontsconfiguration ThedownloadablefontsconfigurationusestheDownloadableFontssupport libraryfeaturetodownloadanemojifont.Italsoupdatesthenecessary emojimetadatathattheEmojiCompat supportlibraryneedstokeepupwiththelatestversionsoftheUnicode specification. Addingsupportlibrarydependency TousetheEmojiCompatsupportlibrary, youmustmodifyyourappproject'sclasspathdependencieswithinyour developmentenvironment. Toaddasupportlibrarytoyourapplicationproject: Openthebuild.gradlefileofyourapplication. Addthesupportlibrarytothedependenciessection. Groovy dependencies{ ... implementation"com.android.support:support-emoji:28.0.0" } Kotlin dependencies{ ... implementation("com.android.support:support-emoji:28.0.0") } Initializingthedownloadablefont configuration YouneedtoinitializeEmojiCompatto loadthemetadataandthetypeface.Sinceinitializationcantakesometime, theinitializationprocessrunsonabackgroundthread. ToinitializeEmojiCompatwiththe downloadablefontconfiguration,performthefollowingsteps: CreateaninstanceoftheFontRequest classandprovidethefontproviderauthority,thefontproviderpackage, thefontquery,andalistofsetsofhashesforthecertificate.Formore informationaboutFontRequest,refer tothe UsingDownloadableFontsprogrammatically sectionintheDownloadableFonts documentation. Createaninstanceof FontRequestEmojiCompatConfig andprovideinstancesofContextand FontRequest. InitializeEmojiCompatbycallingthe init() methodandpasstheinstanceof FontRequestEmojiCompatConfig. Kotlin classMyApplication:Application(){ overridefunonCreate(){ super.onCreate() valfontRequest=FontRequest( "com.example.fontprovider", "com.example", "emojicompatFontQuery", CERTIFICATES ) valconfig=FontRequestEmojiCompatConfig(this,fontRequest) EmojiCompat.init(config) } } Java publicclassMyApplicationextendsApplication{ @Override publicvoidonCreate(){ super.onCreate(); FontRequestfontRequest=newFontRequest( "com.example.fontprovider", "com.example", "emojicompatFontQuery", CERTIFICATES); EmojiCompat.Configconfig=newFontRequestEmojiCompatConfig(this,fontRequest); EmojiCompat.init(config); } } UseEmojiCompatwidgetsinlayout XMLs.IfyouareusingAppCompat, refertothe UsingEmojiCompatwidgetswithAppCompat section. Formoreinformationabouthowtoconfigure EmojiCompatwiththedownloadablefont configuration,gotoEmojiCompatibilitysampleapp Java |Kotlin. Librarycomponents Figure3.LibrarycomponentsintheEmojiCompatprocess Widgets:EmojiEditText, EmojiTextView, EmojiButton Defaultwidgetimplementationstouse EmojiCompatwith TextView,EditText,and Button. EmojiCompat Mainpublicsurfaceforthesupportlibrary.Itperformsallthe externalcallsandcoordinateswiththeotherpartsofthesystem. EmojiCompat.Config Configuresthesingletoninstancetobecreated. EmojiSpan AReplacementSpansubclassthatreplacesthe character(sequences)andrenderstheglyph. EmojiCompatFont EmojiCompatusesafonttodisplay emoji.Thisfontisamodifiedversionofthe AndroidEmojifont. Thefontismodifiedasfollows: Toprovidebackwardcompatibilitytorenderemoji,allemoji charactersarerepresentedwithasingleUnicodecodepointin Unicode’sSupplementalPrivateUseArea-AstartingwithU+F0001. Extraemojimetadataisinsertedinabinaryformatintothefontand isparsedatruntimeby EmojiCompat.Thedataisembedded inthefont’smetatable,withtheprivatetag Emji. Configurationoptions YoucanusetheEmojiCompatinstanceto modifyEmojiCompatbehavior.Youcanuse thefollowingmethodsfromthebaseclasstosettheconfiguration: setReplaceAll(): DetermineswhetherEmojiCompatshould replaceallemojiitfindswith EmojiSpans.Bydefault, EmojiCompattriesitsbestto understandifthesystemcanrenderanemojianddoesnotreplacethose emoji.Whensettotrue, EmojiCompatreplacesallemojiitfinds withEmojiSpans. setEmojiSpanIndicatorEnabled():Indicateswhether EmojiCompathasreplacedanemojiwith an EmojiSpan.Whensettotrue, EmojiCompatdrawsabackgroundforthe EmojiSpan.Thismethodismainlyused fordebuggingpurposes. setEmojiSpanIndicatorColor(): SetsthecolortoindicateanEmojiSpan. ThedefaultvalueisGREEN. registerInitCallback: Informsappaboutthestateofthe EmojiCompatinitialization. Kotlin valconfig=FontRequestEmojiCompatConfig(...) .setReplaceAll(true) .setEmojiSpanIndicatorEnabled(true) .setEmojiSpanIndicatorColor(Color.GREEN) .registerInitCallback(object:EmojiCompat.InitCallback(){ ... }) Java EmojiCompat.Configconfig=newFontRequestEmojiCompatConfig(...) .setReplaceAll(true) .setEmojiSpanIndicatorEnabled(true) .setEmojiSpanIndicatorColor(Color.GREEN) .registerInitCallback(newInitCallback(){...}) Addinginitializationlisteners EmojiCompatand EmojiCompatclasses provide registerInitCallback() and unregisterInitCallback() methodstoregisteraninitializationcallback.Tousethesemethods,create aninstanceofthe EmojiCompat.InitCallbackclass.Call thesemethodsandpasstheinstanceofthe EmojiCompat.InitCallbackclass.Whenthe initializationoftheEmojiCompatsupport libraryissuccessful,theEmojiCompat classcallsthe onInitialized() method.Ifthelibrary failstoinitialize,theEmojiCompat classcallsthe onFailed() method. Tochecktheinitializationstateatanypoint,callthe getLoadState() method.Itreturnsoneofthefollowingvalues: LOAD_STATE_LOADING, LOAD_STATE_SUCCEEDED, orLOAD_STATE_FAILED. UsingEmojiCompatwithAppCompatwidgets IfyouareusingAppCompatwidgets,you canuseEmojiCompatwidgetsthatextend fromAppCompatwidgets. Addthesupportlibrarytothedependenciessection. Groovy dependencies{ ... implementation"com.android.support:support-emoji-bundled:$version" } Kotlin dependencies{ implementation("com.android.support:support-emoji-appcompat:$version") } Groovy dependencies{ implementation"com.android.support:support-emoji-appcompat:$version" } UseEmojiCompat AppCompatWidgetwidgetsinlayout XMLs. Bundledfontsconfiguration TheEmojiCompatsupportlibraryisalso availableinabundledfontversion.Thispackageincludesthefontwiththe embeddedmetadata.Thepackagealsoincludesa BundledEmojiCompatConfig thatusestheAssetManagertoloadthemetadata andfonts. Note:Thesizeofthefontisinmultiple megabytes. Addingsupportlibrarydependency TousetheEmojiCompatsupportlibrary withbundledfontconfiguration,youmustmodifyyourappproject's classpathdependencieswithinyourdevelopmentenvironment. Toaddasupportlibrarytoyourapplicationproject: Openthebuild.gradlefileofyourapplication. Addthesupportlibrarytothedependenciessection. Groovy dependencies{ ... implementation"com.android.support:support-emoji:28.0.0" } Kotlin dependencies{ ... implementation("com.android.support:support-emoji:28.0.0") } UsingbundledfontstoconfigureEmojiCompat Tousebundledfontstoconfigure EmojiCompat,performthefollowingsteps: UseBundledEmojiCompatConfig tocreateaninstanceofEmojiCompat andprovideaninstanceofContext. Callthe init() methodtoinitialize EmojiCompatandpasstheinstanceof BundledEmojiCompatConfig. Kotlin classMyApplication:Application(){ overridefunonCreate(){ super.onCreate() valconfig=BundledEmojiCompatConfig(this) EmojiCompat.init(config) } } Java publicclassMyApplicationextendsApplication{ @Override publicvoidonCreate(){ super.onCreate(); EmojiCompat.Configconfig=newBundledEmojiCompatConfig(this); EmojiCompat.init(config); ... } } UsingEmojiCompatwithoutwidgets EmojiCompatuses EmojiSpantorendercorrectimages. Therefore,ithastoconvertanygivenCharSequenceinto Spannedinstanceswith EmojiSpans.The EmojiCompatclassprovidesamethodto convertCharSequencesinto Spannedinstanceswith EmojiSpans.Usingthismethod, youcanprocessandcachetheprocessedinstancesinsteadoftherawstring, whichimprovesthepeformanceofyourapplication. Kotlin valprocessed=EmojiCompat.get().process("neutralface\uD83D\uDE10") Java CharSequenceprocessed=EmojiCompat.get().process("neutralface\uD83D\uDE10"); UsingEmojiCompatforIMEs UsingtheEmojiCompatsupportlibrary, keyboardscanrendertheemojisupportedbytheapplicationtheyare interactingwith.IMEscanusethe hasEmojiGlyph() methodtocheckifEmojiCompatiscapable ofrenderinganemoji.ThismethodtakesaCharSequenceof anemojiandreturnstrueif EmojiCompatcandetectandrenderthe emoji. Thekeyboardcanalsochecktheversionofthe EmojiCompatsupportlibrarythattheapp supportstodeterminewhichemojitorenderinthepalette.Tocheckthe version,ifavailable,thekeyboardneedstocheckwhetherthefollowing keysexistinthe EditorInfo.extras bundle: EDITOR_INFO_METAVERSION_KEY Ifthekeyexistsinthebundle,thevaluerepresentsthe versionoftheemojimetadatathattheappuses.Ifthiskeydoesnot exist,theappisnotusingEmojiCompat. EDITOR_INFO_REPLACE_ALL_KEY Ifthekeyexistsandissettotrue,thisindicatesthat theapphascalledthe SetReplaceAll() method.Formoreinformationabout EmojiCompatconfiguration, refertotheConfigurationoptions section. Afterreceivingthekeysinthe EditorInfo.extrasbundle, thekeyboardcanusethe hasEmojiGlyph() method,wheremetadataVersionisthevaluefor EDITOR_INFO_METAVERSION_KEY, tocheckwhethertheappcanrenderaspecificemoji. UsingEmojiCompatwithcustomwidgets Youcanalwaysusetheprocess() methodtopreprocesstheCharSequenceinyourappandadd ittoanywidgetthatcanrenderSpannedinstances;for example,TextView.Inaddition, EmojiCompatprovidesthefollowingwidget helperclassestoletyouenrichyourcustomwidgetswithemojisupportwith minimumeffort. EmojiTextViewHelper EmojiEditTextHelper SampleTextView Kotlin classMyTextView(context:Context):AppCompatTextView(context){ privatevalemojiTextViewHelper:EmojiTextViewHelperbylazy(LazyThreadSafetyMode.NONE){ EmojiTextViewHelper(this).apply{ updateTransformationMethod() } } overridefunsetFilters(filters:Array){ super.setFilters(emojiTextViewHelper.getFilters(filters)) } overridefunsetAllCaps(allCaps:Boolean){ super.setAllCaps(allCaps) emojiTextViewHelper.setAllCaps(allCaps) } } Java publicclassMyTextViewextendsAppCompatTextView{ ... publicMyTextView(Contextcontext){ super(context); init(); } ... privatevoidinit(){ getEmojiTextViewHelper().updateTransformationMethod(); } @Override publicvoidsetFilters(InputFilter[]filters){ super.setFilters(getEmojiTextViewHelper().getFilters(filters)); } @Override publicvoidsetAllCaps(booleanallCaps){ super.setAllCaps(allCaps); getEmojiTextViewHelper().setAllCaps(allCaps); } privateEmojiTextViewHelpergetEmojiTextViewHelper(){ ... } } SampleEditText Kotlin classMyEditText(context:Context):AppCompatEditText(context){ privatevalemojiEditTextHelper:EmojiEditTextHelperbylazy(LazyThreadSafetyMode.NONE){ EmojiEditTextHelper(this).also{ super.setKeyListener(it.getKeyListener(keyListener)) } } overridefunsetKeyListener(input:KeyListener?){ input?.also{ super.setKeyListener(emojiEditTextHelper.getKeyListener(it)) } } overridefunonCreateInputConnection(outAttrs:EditorInfo):InputConnection{ valinputConnection:InputConnection=super.onCreateInputConnection(outAttrs) returnemojiEditTextHelper.onCreateInputConnection( inputConnection, outAttrs )asInputConnection } } Java publicclassMyEditTextextendsAppCompatEditText{ ... publicMyEditText(Contextcontext){ super(context); init(); } ... privatevoidinit(){ super.setKeyListener(getEmojiEditTextHelper().getKeyListener(getKeyListener())); } @Override publicvoidsetKeyListener(android.text.method.KeyListenerkeyListener){ super.setKeyListener(getEmojiEditTextHelper().getKeyListener(keyListener)); } @Override publicInputConnectiononCreateInputConnection(EditorInfooutAttrs){ InputConnectioninputConnection=super.onCreateInputConnection(outAttrs); returngetEmojiEditTextHelper().onCreateInputConnection(inputConnection,outAttrs); } privateEmojiEditTextHelpergetEmojiEditTextHelper(){ ... } } Frequentlyaskedquestions HowdoIinitiatethefontdownload? Theemojifontsaredownloadedonfirstrequest,iftheydonotexist onthedevice.Thedownloadschedulingistransparenttotheapp. Howmuchtimedoesittaketoinitialize? Afterthefontisdownloaded,ittakesapproximately150milliseconds toinitializeEmojiCompat. HowmuchmemorydoestheEmojiCompatsupportlibraryuse? Currently,thedatastructuretofindtheemojiisloadedintheapp’s memoryandusesaround200KB. CanIuseEmojiCompatforacustomTextView? Yes.EmojiCompatprovideshelperclassesforcustomwidgets.Itisalso possibletopreprocessagivenstringandconvertitto Spanned.Formoreinformationaboutwidgethelper classes,refertothe UsingEmojiCompatwithcustomwidgets section. WhathappensifIaddwidgetsinlayoutXMLsondevicesthat runonAndroid4.4(APIlevel19)orlower? YoucanincludetheEmojiCompat supportlibraryoritswidgetsinyourapplicationsthatsupportdevices runningAndroid4.4(APIlevel19)orlower.However,ifadeviceruns onanAndroidversionpriortoAPIlevel19, EmojiCompatanditswidgetsareina "nooperation"state.Thismeansthat EmojiTextViewbehavesexactly likearegularTextView. EmojiCompatinstance;itimmediately getsintoa LOAD_STATE_SUCCEEDED statewhenyoucallthe init() method. Additionalresources Foradditionalinformationonusingthe EmojiCompat library,watchEmojiCompat. ContentandcodesamplesonthispagearesubjecttothelicensesdescribedintheContentLicense.JavaisaregisteredtrademarkofOracleand/oritsaffiliates. Lastupdated2021-11-11UTC. 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