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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 this service always runs in the same process as its clients we don t need to deal with ipc public class localbinder extends binder localservice getservice return localservice this override public void oncreate mnm notificationmanager getsystemservice notification_service display a notification about us starting we put an icon in the status bar shownotification override public int onstartcommand intent intent int flags int startid log i localservice received start id startid intent return start_not_sticky override public void ondestroy cancel the persistent notification mnm cancel notification tell the user we stopped toast maketext this r string local_service_stopped toast length_short show override public ibinder onbind intent intent return mbinder this is the object that receives interactions from clients see remoteservice for a more complete example private final ibinder mbinder new localbinder show a notification while this service is running private void shownotification in this sample we ll use the same text for the ticker and the expanded notification charsequence text gettext r string local_service_started the pendingintent to launch our activity if the user selects this notification pendingintent contentintent pendingintent getactivity this 0 new intent this localserviceactivities controller class 0 set the info for the views that show in the notification panel notification notification new notification builder this setsmallicon r drawable stat_sample the status icon setticker text the status text setwhen system currenttimemillis the time stamp setcontenttitle gettext r string local_service_label the label of the entry setcontenttext text the contents of the entry setcontentintent contentintent the intent to send when the entry is clicked build send the notification mnm notify notification notification with that done one can now write client code that directly accesses the running service such as example of binding and unbinding to the local service bind to receiving an object through which it can communicate with the service note that this is implemented as an inner class only keep the sample all together typically this code would appear in some separate class public static class binding extends activity don t attempt to unbind from the service unless the client has received some information about the service s state private boolean mshouldunbind to invoke the bound service first make sure that this value is not null private localservice mboundservice private serviceconnection mconnection new serviceconnection public void onserviceconnected componentname classname ibinder service this is called when the connection with the service has been established giving us the service object we can use to interact with the service because we have bound to a explicit service that we know is running in our own process we can cast its ibinder to a concrete class and directly access it mboundservice localservice localbinder service getservice tell the user about this for our demo toast maketext binding this r string local_service_connected toast length_short show public void onservicedisconnected componentname classname this is called when the connection with the service has been unexpectedly disconnected that is its process crashed because it is running in our same process we should never see this happen mboundservice null toast maketext binding this r string local_service_disconnected toast length_short show void dobindservice attempts to establish a connection with the service we use an explicit class name because we want a specific service implementation that we know will be running in our own process and thus won t be supporting component replacement by other applications if bindservice new intent binding this localservice class mconnection context bind_auto_create mshouldunbind true else log e my_app_tag error the requested service doesn t exist or this client isn t allowed access to it void dounbindservice if mshouldunbind release information about the service s state unbindservice mconnection mshouldunbind false override protected void ondestroy super ondestroy dounbindservice remote messenger service sample if you need to be able to write a service that can perform complicated communication with clients in remote processes beyond simply the use of context startservice to send commands to it then you can use the messenger class instead of writing full aidl files an example of a service that uses messenger as its client interface is shown here first is the service itself publishing a messenger to an internal handler when bound public class messengerservice extends service for showing and hiding our notification notificationmanager mnm keeps track of all current registered clients arraylist messenger mclients new arraylist messenger holds last value set by a client int mvalue 0 command to the service to register a client receiving callbacks from the service the message s replyto field must be a messenger of the client where callbacks should be sent static final int msg_register_client 1 command to the service to unregister a client ot stop receiving callbacks from the service the message s replyto field must be a messenger of the client as previously given with msg_register_client static final int msg_unregister_client 2 command to service to set a new value this can be sent to the service to supply a new value and will be sent by the service to any registered clients with the new value static final int msg_set_value 3 handler of incoming messages from clients class incominghandler extends handler override public void handlemessage message msg switch msg what case msg_register_client mclients add msg replyto break case msg_unregister_client mclients remove msg replyto break case msg_set_value mvalue msg arg1 for int i mclients size 1 i 0 i try mclients get i send message obtain null msg_set_value mvalue 0 catch remoteexception e the client is dead remove it from the list we are going through the list from back to front so this is safe to do inside the loop mclients remove i break default super handlemessage msg target we publish for clients to send messages to incominghandler final messenger mmessenger new messenger new incominghandler override public void oncreate mnm notificationmanager getsystemservice notification_service display a notification about us starting shownotification override public void ondestroy cancel the persistent notification mnm cancel r string remote_service_started tell the user we stopped toast maketext this r string remote_service_stopped toast length_short show when binding to the service we return an interface to our messenger for sending messages to the service override public ibinder onbind intent intent return mmessenger getbinder show a notification while this service is running private void shownotification in this sample we ll use the same text for the ticker and the expanded notification charsequence text gettext r string remote_service_started the pendingintent to launch our activity if the user selects this notification pendingintent contentintent pendingintent getactivity this 0 new intent this controller class 0 set the info for the views that show in the notification panel notification notification new notification builder this setsmallicon r drawable stat_sample the status icon setticker text the status text setwhen system currenttimemillis the time stamp setcontenttitle gettext r string local_service_label the label of the entry setcontenttext text the contents of the entry setcontentintent contentintent the intent to send when the entry is clicked build send the notification we use a string id because it is a unique number we use it later to cancel mnm notify r string remote_service_started notification if we want to make this service run in a remote process instead of the standard one for its apk we can use android process in its manifest tag to specify one service android name app messengerservice android process remote note that the name remote chosen here is arbitrary and you can use other names if you want additional processes the prefix appends the name to your package s standard process name with that done clients can now bind to the service and send messages to it note that this allows clients to register with it to receive messages back as well example of binding and unbinding to the remote service this demonstrates the implementation of a service which the client will bind to interacting with it through an aidl interface note that this is implemented as an inner class only keep the sample all together typically this code would appear in some separate class public static class binding extends activity messenger for communicating with service messenger mservice null flag indicating whether we have called bind on the service boolean misbound some text view we are using to show state information textview mcallbacktext handler of incoming messages from service class incominghandler extends handler override public void handlemessage message msg switch msg what case messengerservice msg_set_value mcallbacktext settext received from service msg arg1 break default super handlemessage msg target we publish for clients to send messages to incominghandler final messenger mmessenger new messenger new incominghandler class for interacting with the main interface of the service private serviceconnection mconnection new serviceconnection public void onserviceconnected componentname classname ibinder service this is called when the connection with the service has been established giving us the service object we can use to interact with the service we are communicating with our service through an idl interface so get a client side representation of that from the raw service object mservice new messenger service mcallbacktext settext attached we want to monitor the service for as long as we are connected to it try message msg message obtain null messengerservice msg_register_client msg replyto mmessenger mservice send msg give it some value as an example msg message obtain null messengerservice msg_set_value this hashcode 0 mservice send msg catch remoteexception e in this case the service has crashed before we could even do anything with it we can count on soon being disconnected and then reconnected if it can be restarted so there is no need to do anything here as part of the sample tell the user what happened toast maketext binding this r string remote_service_connected toast length_short show public void onservicedisconnected componentname classname this is called when the connection with the service has been unexpectedly disconnected that is its process crashed mservice null mcallbacktext settext disconnected as part of the sample tell the user what happened toast maketext binding this r string remote_service_disconnected toast length_short show void dobindservice establish a connection with the service we use an explicit class name because there is no reason to be able to let other applications replace our component bindservice new intent binding this messengerservice class mconnection context bind_auto_create misbound true mcallbacktext settext binding void dounbindservice if misbound if we have received the service and hence registered with it then now is the time to unregister if mservice null try message msg message obtain null messengerservice msg_unregister_client msg replyto mmessenger mservice send msg catch remoteexception e there is nothing special we need to do if the service has crashed detach our existing connection unbindservice mconnection misbound false mcallbacktext settext unbinding summary constants int start_continuation_mask bits returned by onstartcommand intent int int describing how to continue the service if it is killed int start_flag_redelivery this flag is set in onstartcommand intent int int if the intent is a re delivery of a previously delivered intent because the service had previously returned start_redeliver_intent but had been killed before calling stopself int for that intent int start_flag_retry this flag is set in onstartcommand intent int int if the intent is a retry because the original attempt never got to or returned from onstartcommand intent int int int start_not_sticky constant to return from onstartcommand intent int int if this service s process is killed while it is started after returning from onstartcommand intent int int and there are no new start intents to deliver to it then take the service out of the started state and don t recreate until a future explicit call to context startservice intent int start_redeliver_intent constant to return from onstartcommand intent int int if this service s process is killed while it is started after returning from onstartcommand intent int int then it will be scheduled for a restart and the last delivered intent re delivered to it again via onstartcommand intent int int int start_sticky constant to return from onstartcommand intent int int if this service s process is killed while it is started after returning from onstartcommand intent int int then leave it in the started state but don t retain this delivered intent int start_sticky_compatibility constant to return from onstartcommand intent int int compatibility version of start_sticky that does not guarantee that onstartcommand intent int int will be called again after being killed int stop_foreground_detach selector for stopforeground int if set the notification previously supplied to startforeground int notification will be detached from the service s lifecycle int stop_foreground_legacy this constant was deprecated in api level 33 use stop_foreground_detach instead the legacy behavior was incons...
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