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activecaloriesburnedrecord (2), changelogtokenrequest (2), changelogsrequest (2), upsertmedicalresourcerequest (2), timeinstantrangefilter (2), readrecordsrequestusingids (2), readrecordsrequestusingfilters (2), readmedicalresourcespagerequest (2), readmedicalresourcesinitialrequest (2), matchmakingresponse (2), matchmakingrequest (2), localtimerangefilter (2), getmedicaldatasourcesrequest (2), deletemedicalresourcesrequest (2), createmedicaldatasourcerequest (2), aggregaterecordsrequest (2), multilighteffect (2), lightstate (2), lightsrequest (2), lightsmanager (2), colorsequence (2), inputmanager (2), appcustomizationaction (2), virtualdisplay (2), displaymanager (2), mandatorystreamcombination (2), devicestatesensororientationmap (2), camera2 (2), captureresult (2), cameraofflinesession (2), cameracharacteristics (2), promptverticallistcontentview (2), promptcontentviewwithmoreoptionsbutton (2), authenticationcallback (2), sensorprivacymanager (2), sensormanager (2), displayluts 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rfaces attributelist attributes contenthandler documenthandler dtdhandler entityresolver errorhandler locator parser xmlfilter xmlreader classes handlerbase inputsource exceptions saxexception saxnotrecognizedexception saxnotsupportedexception saxparseexception org xml sax ext overview interfaces attributes2 declhandler entityresolver2 lexicalhandler locator2 classes attributes2impl defaulthandler2 locator2impl org xml sax helpers overview classes attributelistimpl attributesimpl defaulthandler locatorimpl namespacesupport parseradapter parserfactory xmlfilterimpl xmlreaderadapter xmlreaderfactory org xmlpull v1 overview interfaces xmlpullparser xmlserializer classes xmlpullparserfactory exceptions xmlpullparserexception org xmlpull v1 sax2 overview classes driver build ai experiences get started get started hello world developer verification adaptive apps compose for ui ai powered ide training monetization with play ️ optimize by form factor phones tablets foldables android for cars 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content based on your preferences added in api level 36 android app appfunctions kotlin java android app functions provides apis for applications to expose functionality to the system for cross app orchestration and for system privileged agents to discover and execute this functionality most developers should implement app functions through the appfunctions jetpack sdk the jetpack sdk offers a more convenient and type safe way to build app functions app functions is currently a beta experimental preview feature what are app functions an app function is a discrete piece of functionality within an application that is made available for execution by trusted system privileged applications referred to as agents this allows agents to orchestrate complex workflows across multiple applications for example an agent could execute a createnote function in a note taking app or a playsong function in a music app the app functions framework interacts with two main players the app any application that exposes one or more app functions the agent a trusted application that discovers and executes app functions from other apps all interactions with the app functions system start with appfunctionmanager and appfunctionservice the app providing functions an app can provide functions in two ways through a dedicated service or by registering them at runtime in both cases functions must first be declared in an xml asset file declaring function metadata all app functions regardless of implementation must be declared in an xml asset file this file defines the appfunctionmetadata for each function example xml declaration e g assets note_app_functions xml appfunctions appfunction id createnote id enabledbydefault true enabledbydefault parameters parameters returntype returntype appfunction appfunctions functions implemented using appfunctionservice this approach is suitable for functionality that is always available regardless of a component s lifecycle the system will wake up your app to execute the function when executed by an agent declare the function metadata in an xml asset file as described above implement a class that extends appfunctionservice override the appfunctionservice onexecutefunction method to provide the execution logic declare the service in your androidmanifest xml requiring the bind_app_function_service permission and include an intent filter for the appfunctionservice service_interface action reference the metadata xml file from the service declaration using a property tag named android app appfunctions example androidmanifest xml service android name noteappfunctionservice android permission android permission bind_app_function_service android exported true property android name android app appfunctions android value note_app_functions xml intent filter action android name android app appfunctions appfunctionservice intent filter service important only one appfunctionservice implementation can be active in an app at a time example implementation class noteappfunctionservice appfunctionservice override fun onexecutefunction request executeappfunctionrequest callingpackage string callingpackagesigninginfo signinginfo cancellationsignal cancellationsignal callback outcomereceiver executeappfunctionresponse appfunctionexception when request functionidentifier createnote implement createnote functionality callback onresult executeappfunctionresponse else should never happen the system will automatically return function_not_found callback onerror appfunctionexception appfunctionexception function_not_found unknown function request functionidentifier important it is strongly recommended that you do not alter your function u2019s behavior based on the callingpackage or callingpackagesigninginfo your function should behave consistently for all callers to ensure a predictable experience starting in cinnamon_bun the value of callingpackage will always be an empty string and callingpackagesigninginfo will always be an unknown signing info functions implemented using appfunctionmanager registerappfunction starting in android cinnamon_bun this approach is suitable for functionality that is only available when the app is in a certain runtime state such as functionality tied to a specific activity declare the function metadata in an xml asset file as described above add a scope activity global scope tag to each appfunction to define its scope see function scopes below for details implement the appfunction interface to define the execution logic at runtime e g in onstart register your appfunction implementation using appfunctionmanager registerappfunction keep the returned appfunctionregistration object and call appfunctionregistration unregister when the function is no longer relevant e g in onstop or before stopforeground boolean example androidmanifest xml application property android name android app appfunctions android value note_runtime_app_functions xml application example implementation class noteactivity activity private lateinit var appfunctionregistration appfunctionregistration override fun onstart super onstart val appfunctionmanager getsystemservice appfunctionmanager appfunctionregistration appfunctionmanager registerappfunction getactivenotecontent mainexecutor object appfunction override fun onexecuteappfunction request executeappfunctionrequest cancellationsignal cancellationsignal callback outcomereceiver executeappfunctionresponse appfunctionexception implement getactivenotecontent functionality callback onresult executeappfunctionresponse override fun onstop appfunctionregistration unregister super onstop function scopes functions implemented using appfunctionmanager registerappfunction can have different scopes defined in their xml metadata appfunctionmetadata scope_activity the function is tied to a specific activity instance multiple activities can register their own version of the same function simultaneously agents can differentiate between them using the appfunctionactivityid appfunctionmetadata scope_global only one implementation of the function can be registered at a time for the entire application this is useful for functions that are tied to a singleton component such as a foreground service functions implemented using appfunctionservice are always considered appfunctionmetadata scope_global important functions provided with appfunctionmanager registerappfunction called from an activity context should prefer appfunctionmetadata scope_activity only use appfunctionmetadata scope_global for such functions if you are absolutely sure there can be only one instance of that activity the agent discovering and executing functions an agent s lifecycle with an app function typically involves three steps discovery state retrieval and execution 1 discovering app functions agents can find available functions using appfunctionmanager searchappfunctions this method returns the appfunctionmetadata for functions that match the given appfunctionsearchspec this metadata contains essential non changing information about a function such as its unique appfunctionname and its execution scope 2 retrieving runtime state while appfunctionmetadata is static a function s state can change at runtime for example a function might be temporarily disabled by the app or might be registered at runtime from one or more activity s agents can query the current appfunctionstate using appfunctionmanager getappfunctionstates this state indicates whether the function is currently enabled and for functions of appfunctionmetadata scope_activity which appfunctionactivityid instances have registered it agents can also use appfunctionmanager getappfunctionactivitystates to get the list of appfunctionname s currently associated with a known appfunctionactivityid this is useful for example for agents coming from a voiceinteractionsession which they can convert to an appfunctionactivityid using getappfunctionactivityid activityid to keep both appfunctionmetadata and appfunctionstate up to date during an agentic runtime session agents can use appfunctionmanager observeappfunctions to be notified of changes to function metadata and state 3 executing app functions once an agent has the necessary metadata and confirms the function is enabled it can execute the function using appfunctionmanager executeappfunction the agent must construct an executeappfunctionrequest which specifies the target function and any required parameters the execution can result in a successful executeappfunctionresponse or an appfunctionexception if an error occurs interfaces appfunction an interface for implementing the logic of an app function registered at runtime using appfunctionmanager registerappfunction appfunctionobservation result of appfunctionmanager observeappfunctions appfunctionobserver interface for observing changes to app functions provided to appfunctionmanager observeappfunctions appfunctionregistration result of appfunctionmanager registerappfunction classes appfunctionactivityid an identifier of an activity an app function can be associated with appfunctionactivitystate the state of an activity from the perspective of app functions retrieved using appfunctionmanager getappfunctionactivitystates appfunctionmanager provides access to app functions appfunctionmetadata contains an app function s metadata essential for its invocation and discovery retrieved using appfunctionmanager searchappfunctions appfunctionname globally unique identifier for an app function appfunctionpackagemetadata contains metadata about a package providing app functions appfunctionschemametadata contains identifying metadata for a predefined schema which can describe well known function signatures appfunctionsearchspec filter criteria for appfunctionmanager searchappfunctions appfunctionsearchspec builder builder for constructing appfunctionsearchspec appfunctionservice extend this class to implement app functions that can be executed by appfunctionmanager executeappfunction appfunctionstate runtime state of an app function retrieved using appfunctionmanager getappfunctionstates appfunctionurigrant uri for which access permission is to be granted to the caller of appfunctionmanager executeappfunction provided to executeappfunctionresponse executeappfunctionrequest a request to execute an app function provided to appfunctionmanager executeappfunction executeappfunctionrequest builder builder for executeappfunctionrequest executeappfunctionresponse the response to an app function execution returned by appfunctionmanager executeappfunction registerappfunctionrequest a request to register an appfunction implementation provided to appfunctionmanager registerappfunctions exceptions appfunctionexception app function related error interfaces appfunction appfunctionobservation appfunctionobserver appfunctionregistration classes appfunctionactivityid appfunctionactivitystate appfunctionmanager appfunctionmetadata appfunctionname appfunctionpackagemetadata appfunctionschemametadata appfunctionsearchspec appfunctionsearchspec builder appfunctionservice appfunctionstate appfunctionurigrant executeappfunctionrequest executeappfunctionrequest builder executeappfunctionresponse registerappfunctionrequest exceptions appfunctionexception content and code samples on this page are subject to the licenses described in the content license java and openjdk are trademarks or registered trademarks of oracle and or its affiliates last updated 2026 08 28 utc easy to understand easytounderstand thumb up solved my problem solvedmyproblem thumb up other otherup thumb up missing the information i need missingtheinformationineed thumb down too complicated too many steps toocomplicatedtoomanysteps thumb down out of date outofdate thumb down samples code issue samplescodeissue thumb down other otherdown thumb down last updated 2026 08 28 utc x follow androiddev on x youtube check out android developers on youtube linkedin connect 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