Android Kundenservice REFERENZ-ID 000032328
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It is the concept of Android app development. Services are used to implement or to perform background operations running in our app.
It is an application component used to perform long running important background tasks such as playing music, downloading a file or performing a network transaction.
It allows us to enable multitasking in our application. So it has higher priority than inactive apps.
You can also set it priority same as the running foreground task. The system checks jobScheduler and execute service at the appropriate time.
Started: If a service can be started by the application component then it is called started service. Activity calls startService method, then it runs in the background.
Normally this service performs single operation. Bound: If an application component binds a service to bindService then it is called bound.
It has a client server interface which allows component to interact with the service. Android service life cycle is completely different from Android activity.
Life cycle of an service can be different if it is created with the startService or created with the bindService.
Following diagram shows both life cycles. OnStartCommand method is called when startService is used to create a service.
Service stars running in the background after the execution of this method. If you created a service by using this method then stop it by calling stopSelf or stopService method.
OnBound method is used if service is bounded. Other components use this method to bind themselves with the service. OnCreate method is used for the creation of service.
OnDestroy method is used to destroy a service. Here is an example of service in Android Studio. Open your IDE and create a new project.
Create another activity for another screen and name it second. This tutorial explains Android intent, its types and methods with examples.
Android intent An intent is an object used to request an action from another…. A service has life cycle callback methods that you can implement to monitor changes in the service's state and you can perform work at the appropriate stage.
The following diagram on the left shows the life cycle when the service is created with startService and the diagram on the right shows the life cycle when the service is created with bindService : image courtesy : android.
To create an service, you create a Java class that extends the Service base class or one of its existing subclasses.
The Service base class defines various callback methods and the most important are given below. You don't need to implement all the callbacks methods.
However, it's important that you understand each one and implement those that ensure your app behaves the way users expect.
The system calls this method when another component, such as an activity, requests that the service be started, by calling startService.
If you implement this method, it is your responsibility to stop the service when its work is done, by calling stopSelf or stopService methods.
The system calls this method when another component wants to bind with the service by calling bindService.
If you implement this method, you must provide an interface that clients use to communicate with the service, by returning an IBinder object.
You must always implement this method, but if you don't want to allow binding, then you should return null.
The system calls this method when all clients have disconnected from a particular interface published by the service.
The system calls this method when new clients have connected to the service, after it had previously been notified that all had disconnected in its onUnbind Intent.
The system calls this method when the service is first created using onStartCommand or onBind. This call is required to perform one-time set-up.
The system calls this method when the service is no longer used and is being destroyed. Your service should implement this to clean up any resources such as threads, registered listeners, receivers, etc.
This example will take you through simple steps to show how to create your own Android Service. Following is the content of the modified main activity file MainActivity.
This file can include each of the fundamental life cycle methods. We have added startService and stopService methods to start and stop the service.
Following is the content of MyService. This file can have implementation of one or more methods associated with Service based on requirements.
Android Kundenservice VideoSchauen Sie sich am besten zuerst einmal auf den Kundenservice-Seiten Ihres Internet- und/oder E-Mail-Providers um. Sie halten eigentlich alle detaillierte. Allerdings wird es heute auch von Google ab seinem Betriebssystem Kitkat (Android x) unterstützt5. Die Kreditkartenfirmen Visa und MasterCard gaben ihre. Hier findest du Informationen zum Premium Kundenservice für das Galaxy Z Flip und das Galaxy Fold. MEHR ERFAHREN. Smart Repair Service für. entschieden. Der Inhalt ist auf elementar chlorfreiem Papier gedruckt. ISBN 1. Auflage orthodoxia.co E-Mail: kundenservice. Probleme mit Chromecast und Android · Upgrade in der Android-App für zusätzlichen Speicherplatz in der Cloud · Vorgeschlagene Storys auf Android löschen. Other application components can then call bindService to retrieve the interface and begin calling methods on the article source. Notice that the onStartCommand method https://orthodoxia.co/free-play-casino-online/handel-mit-bingren-optionen-erfahrungen.php return an integer. The return value from onStartCommand must be one of the following constants:. The system calls this method when the service is no longer used and is being destroyed. The basics To create a service, you must create a subclass of Service or use one of its existing subclasses. Build TV playback apps. Note : The this web page and onDestroy methods are called for all services, whether they're created by startService or bindService. Manage device awake state. The Android system stops a service only when memory is low and it must recover system resources for the activity that has user focus. JavaTpoint offers too many high Spielhalle services.
Let's see the example of service in android that plays an audio in the background. Audio will not be stopped even if you switch to another activity.
To stop the audio, you need to stop the service. Now create the service implemenation class by inheriting the Service class and overridding its callback methods.
Now create the MainActivity class to perform event handling. Here, we are writing the code to start and stop service.
Additionally, calling the second activity on buttonNext. JavaTpoint offers too many high quality services. Mail us on hr javatpoint.
Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. Android Training Android Tutorial. Service; import android.
Intent; import android. MediaPlayer; import android. IBinder; import android. Nullable; import android. AppCompatActivity; import android.
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Software E. Web Tech. In most situations, for example, you shouldn't access location information from the background.
Instead, schedule tasks using WorkManager. Although this documentation generally discusses started and bound services separately, your service can work both ways—it can be started to run indefinitely and also allow binding.
It's simply a matter of whether you implement a couple of callback methods: onStartCommand to allow components to start it and onBind to allow binding.
Regardless of whether your service is started, bound, or both, any application component can use the service even from a separate application in the same way that any component can use an activity—by starting it with an Intent.
However, you can declare the service as private in the manifest file and block access from other applications.
This is discussed more in the section about Declaring the service in the manifest. A service is simply a component that can run in the background, even when the user is not interacting with your application, so you should create a service only if that is what you need.
If you must perform work outside of your main thread, but only while the user is interacting with your application, you should instead create a new thread in the context of another application component.
For example, if you want to play some music, but only while your activity is running, you might create a thread in onCreate , start running it in onStart , and stop it in onStop.
Also consider using thread pools and executors from the java. See the Threading on Android document for more information about moving execution to background threads.
Remember that if you do use a service, it still runs in your application's main thread by default, so you should still create a new thread within the service if it performs intensive or blocking operations.
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:. If a component starts the service by calling startService which results in a call to onStartCommand , the service continues to run until it stops itself with stopSelf or another component stops it by calling stopService.
If a component calls bindService to create the service and onStartCommand is not called, the service runs only as long as the component is bound to it.
After the service is unbound from all of its clients, the system destroys it. The Android system stops a service only when memory is low and it must recover system resources for the activity that has user focus.
If the service is bound to an activity that has user focus, it's less likely to be killed; if the service is declared to run in the foreground , it's rarely killed.
If the service is started and is long-running, the system lowers its position in the list of background tasks over time, and the service becomes highly susceptible to killing—if your service is started, you must design it to gracefully handle restarts by the system.
If the system kills your service, it restarts it as soon as resources become available, but this also depends on the value that you return from onStartCommand.
For more information about when the system might destroy a service, see the Processes and Threading document.
In the following sections, you'll see how you can create the startService and bindService service methods, as well as how to use them from other application components.
You must declare all services in your application's manifest file, just as you do for activities and other components.
Here is an example:. The android:name attribute is the only required attribute—it specifies the class name of the service. After you publish your application, leave this name unchanged to avoid the risk of breaking code due to dependence on explicit intents to start or bind the service read the blog post, Things That Cannot Change.
Caution : To ensure that your app is secure, always use an explicit intent when starting a Service and don't declare intent filters for your services.
Using an implicit intent to start a service is a security hazard because you cannot be certain of the service that responds to the intent, and the user cannot see which service starts.
Beginning with Android 5. You can ensure that your service is available to only your app by including the android:exported attribute and setting it to false.
This effectively stops other apps from starting your service, even when using an explicit intent. Note : Users can see what services are running on their device.
If they see a service that they don't recognize or trust, they can stop the service. In the description, provide a short sentence explaining what the service does and what benefits it provides.
A started service is one that another component starts by calling startService , which results in a call to the service's onStartCommand method.
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.
An application component such as an activity can start the service by calling startService and passing an Intent that specifies the service and includes any data for the service to use.
The service receives this Intent in the onStartCommand method. For instance, suppose an activity needs to save some data to an online database.
The activity can start a companion service and deliver it the data to save by passing an intent to startService.
The service receives the intent in onStartCommand , connects to the Internet, and performs the database transaction. When the transaction is complete, the service stops itself and is destroyed.
Caution: A service runs in the same process as the application in which it is declared and in the main thread of that application by default.
If your service performs intensive or blocking operations while the user interacts with an activity from the same application, the service slows down activity performance.
To avoid impacting application performance, start a new thread inside the service. The Service class is the base class for all services.
When you extend this class, it's important to create a new thread in which the service can complete all of its work; the service uses your application's main thread by default, which can slow the performance of any activity that your application is running.
The Android framework also provides the IntentService subclass of Service that uses a worker thread to handle all of the start requests, one at a time.
Using this class is not recommended for new apps as it will not work well starting with Android 8 Oreo, due to the introduction of Background execution limits.
Moreover, it's deprecated starting with Android The following sections describe how you can implement your own custom service, however you should strongly consider using WorkManager instead for most use cases.
Consult the guide to background processing on Android to see if there is a solution that fits your needs. You can extend the Service class to handle each incoming intent.
Here's how a basic implementation might look:. The example code handles all incoming calls in onStartCommand and posts the work to a Handler running on a background thread.
It works just like an IntentService and processes all requests serially, one after another. You could change the code to run the work on a thread pool, for example, if you'd like to run multiple requests simultaneously.
Notice that the onStartCommand method must return an integer. The integer is a value that describes how the system should continue the service in the event that the system kills it.
The return value from onStartCommand must be one of the following constants:. For more details about these return values, see the linked reference documentation for each constant.
You can start a service from an activity or other application component by passing an Intent to startService or startForegroundService.
The Android system calls the service's onStartCommand method and passes it the Intent , which specifies which service to start.
Note : If your app targets API level 26 or higher, the system imposes restrictions on using or creating background services unless the app itself is in the foreground.
If an app needs to create a foreground service, the app should call startForegroundService. That method creates a background service, but the method signals to the system that the service will promote itself to the foreground.
Once the service has been created, the service must call its startForeground method within five seconds. For example, an activity can start the example service in the previous section HelloService using an explicit intent with startService , as shown here:.
The startService method returns immediately, and the Android system calls the service's onStartCommand method. If the service isn't already running, the system first calls onCreate , and then it calls onStartCommand.
If the service doesn't also provide binding, the intent that is delivered with startService is the only mode of communication between the application component and the service.
However, if you want the service to send a result back, the client that starts the service can create a PendingIntent for a broadcast with getBroadcast and deliver it to the service in the Intent that starts the service.
The service can then use the broadcast to deliver a result. Multiple requests to start the service result in multiple corresponding calls to the service's onStartCommand.
However, only one request to stop the service with stopSelf or stopService is required to stop it.
A started service must manage its own lifecycle. That is, the system doesn't stop or destroy the service unless it must recover system memory and the service continues to run after onStartCommand returns.
The service must stop itself by calling stopSelf , or another component can stop it by calling stopService.
Once requested to stop with stopSelf or stopService , the system destroys the service as soon as possible. If your service handles multiple requests to onStartCommand concurrently, you shouldn't stop the service when you're done processing a start request, as you might have received a new start request stopping at the end of the first request would terminate the second one.
To avoid this problem, you can use stopSelf int to ensure that your request to stop the service is always based on the most recent start request.
That is, when you call stopSelf int , you pass the ID of the start request the startId delivered to onStartCommand to which your stop request corresponds.
Then, if the service receives a new start request before you are able to call stopSelf int , the ID doesn't match and the service doesn't stop.
Caution: To avoid wasting system resources and consuming battery power, ensure that your application stops its services when it's done working.
If necessary, other components can stop the service by calling stopService. Even if you enable binding for the service, you must always stop the service yourself if it ever receives a call to onStartCommand.
For more information about the lifecycle of a service, see the section below about Managing the Lifecycle of a Service. A bound service is one that allows application components to bind to it by calling bindService to create a long-standing connection.
It generally doesn't allow components to start it by calling startService. Create a bound service when you want to interact with the service from activities and other components in your application or to expose some of your application's functionality to other applications through interprocess communication IPC.
To create a bound service, implement the onBind callback method to return an IBinder that defines the interface for communication with the service.
Other application components can then call bindService to retrieve the interface and begin calling methods on the service.
The service lives only to serve the application component that is bound to it, so when there are no components bound to the service, the system destroys it.
You do not need to stop a bound service in the same way that you must when the service is started through onStartCommand.
To create a bound service, you must define the interface that specifies how a client can communicate with the service.
This interface between the service and a client must be an implementation of IBinder and is what your service must return from the onBind callback method.
After the client receives the IBinder , it can begin interacting with the service through that interface.
Multiple clients can bind to the service simultaneously. When a client is done interacting with the service, it calls unbindService to unbind.
When there are no clients bound to the service, the system destroys the service. There are multiple ways to implement a bound service, and the implementation is more complicated than a started service.
For these reasons, the bound service discussion appears in a separate document about Bound Services.
When a service is running, it can notify the user of events using Toast Notifications or Status Bar Notifications. A toast notification is a message that appears on the surface of the current window for only a moment before disappearing.
A status bar notification provides an icon in the status bar with a message, which the user can select in order to take an action such as start an activity.
Usually, a status bar notification is the best technique to use when background work such as a file download has completed, and the user can now act on it.
When the user selects the notification from the expanded view, the notification can start an activity such as to display the downloaded file.
A foreground service is a service that the user is actively aware of and isn't a candidate for the system to kill when low on memory.
A foreground service must provide a notification for the status bar, which is placed under the Ongoing heading.
This means that the notification cannot be dismissed unless the service is either stopped or removed from the foreground.
You should only use a foreground service when your app needs to perform a task that is noticeable by the user even when they're not directly interacting with the app.
If the action is of low enough importance that you want to use a minimum-priority notification, you probably shouldn't be using a service; instead, consider using a scheduled job.
Every app that runs a service places an additional load on the system, consuming system resources. If an app tries to hide its services by using a low-priority notification, this can impair the performance of the app the user is actively interacting with.
For this reason, if an app tries to run a service with a minimum-priority notification, the system calls out the app's behavior in the notification drawer's bottom section.
For example, a music player that plays music from a service should be set to run in the foreground, because the user is explicitly aware of its operation.
The notification in the status bar might indicate the current song and allow the user to launch an activity to interact with the music player.
Similarly, an app to let users track their runs would need a foreground service to track the user's location. To request that your service run in the foreground, call startForeground.
This method takes two parameters: an integer that uniquely identifies the notification and the Notification for the status bar.
Caution: The integer ID that you give to startForeground must not be 0. To remove the service from the foreground, call stopForeground.
This method takes a boolean, which indicates whether to remove the status bar notification as well. This method does not stop the service.
However, if you stop the service while it's still running in the foreground, the notification is also removed.
For more information about notifications, see Creating Status Bar Notifications. The lifecycle of a service is much simpler than that of an activity.
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:.
The service is created when another component calls startService. The service then runs indefinitely and must stop itself by calling stopSelf.
Another component can also stop the service by calling stopService. When the service is stopped, the system destroys it.
The service is created when another component a client calls bindService. The client then communicates with the service through an IBinder interface.
The client can close the connection by calling unbindService. Multiple clients can bind to the same service and when all of them unbind, the system destroys the service.
The service does not need to stop itself. These two paths aren't entirely separate. You can bind to a service that is already started with startService.
For example, you can start a background music service by calling startService with an Intent that identifies the music to play.
Later, possibly when the user wants to exercise some control over the player or get information about the current song, an activity can bind to the service by calling bindService.
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.
The following skeleton service demonstrates each of the lifecycle methods:. Note: Unlike the activity lifecycle callback methods, you are not required to call the superclass implementation of these callback methods.
Figure 2. The service lifecycle. The diagram on the left shows the lifecycle when the service is created with startService and the diagram on the right shows the lifecycle when the service is created with bindService.
Figure 2 illustrates the typical callback methods for a service. Although the figure separates services that are created by startService from those created by bindService , keep in mind that any service, no matter how it's started, can potentially allow clients to bind to it.
A service that was initially started with onStartCommand by a client calling startService can still receive a call to onBind when a client calls bindService.
By implementing these methods, you can monitor these two nested loops of the service's lifecycle:. Note : The onCreate and onDestroy methods are called for all services, whether they're created by startService or bindService.
If the service is started, the active lifetime ends at the same time that the entire lifetime ends the service is still active even after onStartCommand returns.
If the service is bound, the active lifetime ends when onUnbind returns. Note: Although a started service is stopped by a call to either stopSelf or stopService , there isn't a respective callback for the service there's no onStop callback.
Unless the service is bound to a client, the system destroys it when the service is stopped— onDestroy is the only callback received.
For more information about creating a service that provides binding, see the Bound Services document, which includes more information about the onRebind callback method in the section about Managing the lifecycle of a bound service.
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