Emoji Compatibility | Android Developers

It also updates the necessary emoji metadata that the EmojiCompat support library needs to keep up with the latest versions of the Unicode specification. 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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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