Managing the Lifecycle of a Service 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 bac…
1.Bound Services A bound service is the server in a client-server interface. A bound service allows components (such as activities) to bind to the service, send requests, receive responses, and even perform interprocess communication (IPC). A bound s…
1.Creating a Started Service A started service is one that another component starts by calling startService(), resulting in a call to the service's onStartCommand() method. When a service is started, it has a lifecycle that's independent of the compo…
Services 简介和分类 A Service is an application component that can perform long-running operations in the background and does not provide a user interface. Another application component can start a service and it will continue to run in the background eve…
Android Interface Definition Language (AIDL) 1.In this document Defining an AIDL Interface Create the .aidl file Implement the interface Expose the interface to clients Passing Objects over IPC Calling an IPC Method See also Bound Services AIDL (Andr…
Binding to a Service Application components (clients) can bind to a service by calling bindService(). The Android system then calls the service's onBind() method, which returns an IBinder for interacting with the service. The binding is asynchronous.…
Compared to AIDL When you need to perform IPC, using a Messenger for your interface is simpler than implementing it with AIDL, because Messenger queues all calls to the service, whereas, a pure AIDL interface sends simultaneous requests to the servic…
1.Sending Notifications to the User (发送通知) Once running, a service 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 a moment t…
Bound Services 1.In this document The Basics Creating a Bound Service Extending the Binder class Using a Messenger Binding to a Service Additional notes Managing the Lifecycle of a Bound Service Key classes Service ServiceConnection IBinder Samples R…
Managing the Lifecycle of a Bound Service When a service is unbound from all clients, the Android system destroys it (unless it was also started with onStartCommand()). As such, you don't have to manage the lifecycle of your service if it's purely a…
Extending the Binder class If your service is used only by the local application and does not need to work across processes, then you can implement your own Binder class that provides your client direct access to public methods in the service. Note:…
Alternative Forms of Provider Access Three alternative forms of provider access are important in application development: Batch access: You can create a batch of access calls with methods in the ContentProviderOperation class, and then apply them wit…
