startService is used when you don't need to communicate with the service. BindService is used when yout need to communicate with it.
Full Answer
How do I bind a service to a started service?
Binding to a started service. As discussed in the Services document, you can create a service that is both started and bound. That is, you can start a service by calling startService(), which allows the service to run indefinitely, and you can also allow a client to bind to the service by calling bindService().
What is the difference between a bound service and a service?
For additional information about services in general, such as how to deliver notifications from a service and set the service to run in the foreground, refer to the Services document. A bound service is an implementation of the Service class that allows other applications to bind to it and interact with it.
Does stopservice stop a service until all clients unbind?
In cases such as this, stopService () or stopSelf () doesn't actually stop the service until all of the clients unbind. Like an activity, a service has lifecycle callback methods that you can implement to monitor changes in the service's state and perform work at the appropriate times.
What is the return value of bindservice?
The return value of bindService() indicates whether the requested service exists and whether the client is permitted access to it. When the Android system creates the connection between the client and service, it calls onServiceConnected() on the ServiceConnection.
How to keep a service around without binding?
What happens when you unbind a service?
How to stop a service?
Can you start and bind a service?
Can a service be both started and have connections bound to it?
Can you bind and unbind the same service?
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About this website
What is bindService () meant for?
It allows components (such as activities) to bind to the service, send requests, receive responses, and perform interprocess communication (IPC). A bound service typically lives only while it serves another application component and does not run in the background indefinitely.
What is the difference between start service and bind service?
Started services run until they are stopped or destroyed and do not inherently provide a mechanism for interaction or data exchange with other components. Bound services, on the other hand, provide a communication interface to other client components and generally run until the last client unbinds from the service.
What is the use of onBind () in Android?
Binding to a Service The Android system then calls the service's onBind() method, which returns an IBinder for interacting with the service. The binding is asynchronous. bindService() returns immediately and does not return the IBinder to the client.
How can I tell if Android background service is running?
You can do this by making your own Interface where you declare for example " isServiceRunning() ". You can then bind your Activity to your Service, run the method isServiceRunning(), the Service will check for itself if it is running or not and returns a boolean to your Activity.
What is intent and activity?
All Android activities are started or activated with an intent. Intents are message objects that make a request to the Android runtime to start an activity or other app component in your app or in some other app.
When would you use a WorkManager?
WorkManager is intended for work that is required to run reliably even if the user navigates off a screen, the app exits, or the device restarts. For example: Sending logs or analytics to backend services. Periodically syncing application data with a server.
What is difference between service and Intentservice in Android?
If the task doesn't require any and also not a very long task you can use service. If the Background task is to be performed for a long time we can use the intent service. Service will always run on the main thread.
What is AIDL in Android?
The Android Interface Definition Language (AIDL) is similar to other IDLs you might have worked with. It allows you to define the programming interface that both the client and service agree upon in order to communicate with each other using interprocess communication (IPC).
What is unbound service in Android?
Unbound Service or Started A service is started when an application component, such as an activity, starts it by calling startService(). Once started, a service can run in the background indefinitely, even if the component that started it is destroyed.
What apps are running in the background Android?
To open Quick Settings, from the top of the screen, swipe down twice. To see the number of active apps running in the background: At the bottom left, tap # active apps. Or, at the bottom right, tap the number next to Settings and Power .
What is the difference between foreground and background services on Android?
A Background Service is a service that runs only when the app is running so it'll get terminated when the app is terminated. A Foreground Service is a service that stays alive even when the app is terminated. And a Bound Service is a service that runs only if the component it is bound to is still active.
What is foreground activity in Android?
Foreground refers to the active apps which consume data and are currently running on the mobile. Background refers to the data used when the app is doing some activity in the background, which is not active right now.
What are types of services in Android?
Types of Android ServicesForeground Services. Foreground services are those services that are visible to the users. ... Background Services. These services run in the background, such that the user can't see or access them. ... Bound Services. ... Started Service. ... Bound Service. ... IntentService() ... onStartCommand() ... onBind()More items...
What is bounded and unbounded services in Android?
Bounded services are bounded to an activity which binds it and will work only till bounded activity is alive. while a unbounded service will work till the completion even after activity is destroyed.
Why do we use bound services?
Services is the Android component which is used to perform long-running background tasks. There are other Android components which run in the background too, like Broadcast receiver and JobScheduler, but they are not used for long running tasks.
What is service and types of service in Android?
Services in Android are a special component that facilitates an application to run in the background in order to perform long-running operation tasks. The prime aim of a service is to ensure that the application remains active in the background so that the user can operate multiple applications at the same time.
What's the difference between start service and bind service? - Treehouse
In Android, a Service can either be started or bound (or both). A started Service is for when you need the Service to do some work, like download a podcast.
Bind service to activity in Android - Stack Overflow
"If you start an android Service with startService(..) that Service will remain running until you explicitly invoke stopService(..).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 ...
Android Start/Stop Service from Activity Example using HandlerThread
Start/Stop Service from Activity To start and stop service from Activity, we need to create Intent first for our Service.To start the service, call startService(intent) and to stop the service, call stopService(intent).
How To Create, Start, Stop Android Background Service
Android background service is an android component that runs in the background. There is no GUI for users to interact with the android background service object directly, it is usually started in android activity and runs in the same thread of the activity.
How to keep a service around without binding?
So the only way to keep it around without activities binding to it is to start it with startService (). There is no conflict with lifecycles because it only applies to how the service is STARTED. So once it's started with startService (), it follows that lifecycle process.
What happens when you unbind a service?
A service that is only bound (and not started) is destroyed when all of its clients unbind. If your UI activity disconnects at this point, the service is destroyed . This isn't a problem if you haven't played any music yet. However, when playback starts, the user probably expects to continue listening even after switching apps. You don't want to destroy the player when you unbind the UI to work with another app.
How to stop a service?
To stop a started service, call Context.stopService () or stopSelf (). The system stops and destroys the service as soon as possible. However, if one or more clients are still bound to the service, the call to stop the service is delayed until all its clients unbind.
Can you start and bind a service?
Yes, You can start and bind (one or more times) the same service. The following flowchart demonstrates how the lifecycle of a service is managed. The variable counter tracks the number of bound clients: Good example - music app. Explanation from Building a Media Browser Service official tutorial:
Can a service be both started and have connections bound to it?
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.
Can you bind and unbind the same service?
So you are free to bind and unbind to it as much as you wish and it will only die when you call stopService () or stopSelf (). Yes, You can start and bind (one or more times) the same service.
How does bind service work?
When it does, it must provide an implementation of ServiceConnection, which monitors the connection with the service. The return value of bindService () indicates whether the requested service exists and whether the client is permitted access to it. When the Android system creates the connection between the client and service, it calls onServiceConnected () on the ServiceConnection. The onServiceConnected () method includes an IBinder argument, which the client then uses to communicate with the bound service.
How to create a service that is both started and bound?
As discussed in the Services document, you can create a service that is both started and bound. That is, you can start a service by calling startService (), which allows the service to run indefinitely, and you can also allow a client to bind to the service by calling bindService () .
Why does my app unbind?
If your client is still bound to a service when your app destroys the client, destruction causes the client to unbind. It is better practice to unbind the client as soon as it is done interacting with the service. Doing so allows the idle service to shut down. For more information about appropriate times to bind and unbind, see Additional notes .
What does Binder do?
In your service, create an instance of Binder that does one of the following: Contains public methods that the client can call. Returns the current Service instance, which has public methods the client can call. Returns an instance of another class hosted by the service with public methods the client can call.
What is bound service?
The basics. A bound service is an implementation of the Service class that allows other applications to bind to it and interact with it. To provide binding for a service, you must implement the onBind () callback method.
What happens when a service is unbound from all clients?
When a service is unbound from all clients, the Android system destroys it (unless it was also started with a startService () call). As such, you don't have to manage the lifecycle of your service if it's purely a bound service—the Android system manages it for you based on whether it is bound to any clients.
How to stop a service when it is unbound?
Instead, you must explicitly stop the service by calling stopSelf () or stopService ( ).
How to invoke bindservice?
The system invokes this method by calling bindService () when another component wants to bind with the service (such as to perform RPC). In your implementation of this method, you must provide an interface that clients use to communicate with the service by returning an IBinder. You must always implement this method; however, if you don't want to allow binding, you should return null.
How to create a service?
To create a service, you must create a subclass of Service or use one of its existing subclasses. In your implementation, you must override some callback methods that handle key aspects of the service lifecycle and provide a mechanism that allows the components to bind to the service, if appropriate. These are the most important callback methods that you should override:
How does a service run in the background?
The system invokes this method by calling startService () when another component (such as an activity) requests that the service be started. When this method executes, the service is started and can run in the background indefinitely. If you implement this, it is your responsibility to stop the service when its work is complete by calling stopSelf () or stopService (). If you only want to provide binding, you don't need to implement this method.
When a service is started, it has a lifecycle that's independent of the component that started it?
When a service is started, it has a lifecycle that's independent of the component that started it. The service can run in the background indefinitely, even if the component that started it is destroyed. As such, the service should stop itself when its job is complete by calling stopSelf (), or another component can stop it by calling stopService ().
Why is it important to pay close attention to how your service is created and destroyed?
However, it's even more important that you pay close attention to how your service is created and destroyed because a service can run in the background without the user being aware. The service lifecycle—from when it's created to when it's destroyed—can follow either of these two paths: A started service.
What is background service?
A background service performs an operation that isn't directly noticed by the user. For example, if an app used a service to compact its storage, that would usually be a background service.
When you use a foreground service, must you display a notification?
When you use a foreground service, you must display a notification so that users are actively aware that the service is running. This notification cannot be dismissed unless the service is either stopped or removed from the foreground.
How to keep a service around without binding?
So the only way to keep it around without activities binding to it is to start it with startService (). There is no conflict with lifecycles because it only applies to how the service is STARTED. So once it's started with startService (), it follows that lifecycle process.
What happens when you unbind a service?
A service that is only bound (and not started) is destroyed when all of its clients unbind. If your UI activity disconnects at this point, the service is destroyed . This isn't a problem if you haven't played any music yet. However, when playback starts, the user probably expects to continue listening even after switching apps. You don't want to destroy the player when you unbind the UI to work with another app.
How to stop a service?
To stop a started service, call Context.stopService () or stopSelf (). The system stops and destroys the service as soon as possible. However, if one or more clients are still bound to the service, the call to stop the service is delayed until all its clients unbind.
Can you start and bind a service?
Yes, You can start and bind (one or more times) the same service. The following flowchart demonstrates how the lifecycle of a service is managed. The variable counter tracks the number of bound clients: Good example - music app. Explanation from Building a Media Browser Service official tutorial:
Can a service be both started and have connections bound to it?
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.
Can you bind and unbind the same service?
So you are free to bind and unbind to it as much as you wish and it will only die when you call stopService () or stopSelf (). Yes, You can start and bind (one or more times) the same service.
