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edentialproviderservice service to be extended by credential providers in order to return user credentials to the framework datamigrationtopccservice base class for a service that handles data migration to the private compute core pcc storage of an application deviceadminservice base class for a service that device owner profile owners can optionally have dreamservice extend this class to implement a custom dream available to the user as a daydream egressreceiverservice base service to be implemented by the partner agent proxy process to receive egress queries from a client running inside the private compute core pcc sandbox hostapduservice hostapduservice is a convenience service class that can be extended to emulate an nfc card inside an android service component hostnfcfservice hostnfcfservice is a convenience service class that can be extended to emulate an nfc f card inside an android service component incallservice this service is implemented by an app that wishes to provide functionality for managing phone calls intentservice this class was deprecated in api level 30 intentservice is subject to all the background execution limits imposed with android 8 0 api level 26 consider using workmanager instead isolatedservice this class was deprecated in api level 37 the odp apis are deprecated and will not be supported in future android releases there is no direct replacement api available developers currently integrated with these apis must cease further integration efforts for comprehensive details regarding this deprecation and the future roadmap of privacy sandbox on android please consult the official privacy sandbox developer documentation and announcements https privacysandbox google com jobservice entry point for the callback from the jobscheduler mediabrowserservice base class for media browser services mediaroute2providerservice base class for media route provider services mediasession2service this class was deprecated in api level 37 use the media3 support library s androidx media3 session mediasessionservice instead midideviceservice a service that implements a virtual midi device midiumpdeviceservice a service that implements a virtual midi device for universal midi packets ump notificationlistenerservice a service that receives calls from the system when new notifications are posted or removed or their ranking changed offhostapduservice offhostapduservice is a convenience service class that can be extended to describe one or more nfc applications that are residing off host for example on an embedded secure element or a uicc pccservice abstract base class for a pcc service that receives data from other components printservice this is the base class for implementing print services quickaccesswalletservice a quickaccesswalletservice provides a list of walletcard s shown in the quick access wallet recognitionservice this class provides a base class for recognition service implementations remoteviewsservice the service to be connected to for a remote adapter to request remoteviews settinginjectorservice dynamically specifies the summary subtitle and enabled status of a preference injected into the list of app settings displayed by the system settings app for use only by apps that are included in the system image for preferences that affect multiple apps settingspreferenceservice base class for a service that exposes its settings preferences to external access spellcheckerservice spellcheckerservice provides an abstract base class for a spell checker texttospeechservice abstract base class for tts engine implementations tileservice a tileservice provides the user a tile that can be added to quick settings tvadservice the tvadservice class represents a tv client side advertisement service tvinputservice the tvinputservice class represents a tv input or source such as hdmi or built in tuner which provides pass through video or broadcast tv programs tvinteractiveappservice a tv interactive application service is a service that provides runtime environment and runs tv interactive applications visualvoicemailservice this service is implemented by dialer apps that wishes to handle omtp or similar visual voicemails voiceinteractionservice top level service of the current global voice interactor which is providing support for hotwording the back end of a voiceinteractor etc voiceinteractionsessionservice an active voice interaction session initiated by a voiceinteractionservice vpnservice vpnservice is a base class for applications to extend and build their own vpn solutions vrlistenerservice a service that is bound from the system while running in virtual reality vr mode wallpaperservice a wallpaper service is responsible for showing a live wallpaper behind applications that would like to sit on top of it known indirect subclasses inputmethodservice inputmethodservice inputmethodservice provides a standard implementation of an inputmethod which final implementations can derive from and customize a service is an application component representing either an application s desire to perform a longer running operation while not interacting with the user or to supply functionality for other applications to use each service class must have a corresponding service declaration in its package s androidmanifest xml services can be started with context startservice and context bindservice note that services like other application objects run in the main thread of their hosting process this means that if your service is going to do any cpu intensive such as mp3 playback or blocking such as networking operations it should spawn its own thread in which to do that work more information on this can be found in processes and threads the jobintentservice class is available as a standard implementation of service that has its own thread where it schedules its work to be done topics covered here what is a service service lifecycle permissions process lifecycle local service sample remote messenger service sample developer guides for a detailed discussion about how to create services read the services developer guide what is a service most confusion about the service class actually revolves around what it is not a service is not a separate process the service object itself does not imply it is running in its own process unless otherwise specified it runs in the same process as the application it is part of a service is not a thread it is not a means itself to do work off of the main thread to avoid application not responding errors thus a service itself is actually very simple providing two main features a facility for the application to tell the system about something it wants to be doing in the background even when the user is not directly interacting with the application this corresponds to calls to context startservice which ask the system to schedule work for the service to be run until the service or someone else explicitly stop it a facility for an application to expose some of its functionality to other applications this corresponds to calls to context bindservice which allows a long standing connection to be made to the service in order to interact with it when a service component is actually created for either of these reasons all that the system actually does is instantiate the component and call its oncreate and any other appropriate callbacks on the main thread it is up to the service to implement these with the appropriate behavior such as creating a secondary thread in which it does its work note that because service itself is so simple you can make your interaction with it as simple or complicated as you want from treating it as a local java object that you make direct method calls on as illustrated by local service sample to providing a full remoteable interface using aidl service lifecycle there are two reasons that a service can be run by the system if someone calls context startservice then the system will retrieve the service creating it and calling its oncreate method if needed and then call its onstartcommand intent int int method with the arguments supplied by the client the service will at this point continue running until context stopservice or stopself is called note that multiple calls to context startservice do not nest though they do result in multiple corresponding calls to onstartcommand so no matter how many times it is started a service will be stopped once context stopservice or stopself is called however services can use their stopself int method to ensure the service is not stopped until started intents have been processed for started services there are two additional major modes of operation they can decide to run in depending on the value they return from onstartcommand start_sticky is used for services that are explicitly started and stopped as needed while start_not_sticky or start_redeliver_intent are used for services that should only remain running while processing any commands sent to them see the linked documentation for more detail on the semantics clients can also use context bindservice to obtain a persistent connection to a service this likewise creates the service if it is not already running calling oncreate while doing so but does not call onstartcommand the client will receive the ibinder object that the service returns from its onbind intent method allowing the client to then make calls back to the service the service will remain running as long as the connection is established whether or not the client retains a reference on the service s ibinder usually the ibinder returned is for a complex interface that has been written in aidl a service can be both started and have connections bound to it in such a case the system will keep the service running as long as either it is started or there are one or more connections to it with the context bind_auto_create flag once neither of these situations hold the service s ondestroy method is called and the service is effectively terminated all cleanup stopping threads unregistering receivers should be complete upon returning from ondestroy permissions global access to a service can be enforced when it is declared in its manifest s service tag by doing so other applications will need to declare a corresponding uses permission element in their own manifest to be able to start stop or bind to the service as of build version_codes gingerbread when using context startservice intent you can also set intent flag_grant_read_uri_permission and or intent flag_grant_write_uri_permission on the intent this will grant the service temporary access to the specific uris in the intent access will remain until the service has called stopself int for that start command or a later one or until the service has been completely stopped this works for granting access to the other apps that have not requested the permission protecting the service or even when the service is not exported at all in addition a service can protect individual ipc calls into it with permissions by calling the contextwrapper checkcallingpermission string method before executing the implementation of that call see the security and permissions document for more information on permissions and security in general process lifecycle the android system will attempt to keep the process hosting a service around as long as the service has been started or has clients bound to it when running low on memory and needing to kill existing processes the priority of a process hosting the service will be the higher of the following possibilities if the service is currently executing code in its oncreate onstartcommand or ondestroy methods then the hosting process will be a foreground process to ensure this code can execute without being killed if the service has been started then its hosting process is considered to be less important than any processes that are currently visible to the user on screen but more important than any process not visible because only a few processes are generally visible to the user this means that the service should not be killed except in low memory conditions however since the user is not directly aware of a background service in that state it is considered a valid candidate to kill and you should be prepared for this to happen in particular long running services will be increasingly likely to kill and are guaranteed to be killed and restarted if appropriate if they remain started long enough if there are clients bound to the service then the service s hosting process is never less important than the most important client that is if one of its clients is visible to the user then the service itself is considered to be visible the way a client s importance impacts the service s importance can be adjusted through context bind_above_client context bind_allow_oom_management context bind_waive_priority context bind_important and context bind_adjust_with_activity a started service can use the startforeground int notification api to put the service in a foreground state where the system considers it to be something the user is actively aware of and thus not a candidate for killing when low on memory it is still theoretically possible for the service to be killed under extreme memory pressure from the current foreground application but in practice this should not be a concern note this means that most of the time your service is running it may be killed by the system if it is under heavy memory pressure if this happens the system will later try to restart the service an important consequence of this is that if you implement onstartcommand to schedule work to be done asynchronously or in another thread then you may want to use start_flag_redelivery to have the system re deliver an intent for you so that it does not get lost if your service is killed while processing it other application components running in the same process as the service such as an activity can of course increase the importance of the overall process beyond just the importance of the service itself local service sample one of the most common uses of a service is as a secondary component running alongside other parts of an application in the same process as the rest of the components all components of an apk run in the same process unless explicitly stated otherwise so this is a typical situation when used in this way by assuming the components are in the same process you can greatly simplify the interaction between them clients of the service can simply cast the ibinder they receive from it to a concrete class published by the service an example of this use of a service is shown here first is the service itself publishing a custom class when bound public class localservice extends service private notificationmanager mnm unique identification number for the notification we use it on notification start and to cancel it private int notification r string local_service_started class for clients to access because we know th...
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