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.…

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…

Serivce中onRebind被调用的时机非常特别,想知道什么时候onRebind被调用,能够接以下的次序来学习.最后自然就明确了! 1. 首先要知道.同一个服务既可能被启动也能够被绑定; 2. Service中onRebind方法被调用.仅仅要符合两个必要条件即可 (1)服务中onUnBind方法返回值为true (2)服务对象被解绑后没有被销毁.之后再次被绑定 .以下举例说明: 例1:同一个Activity对象 先自启动服务(onCreate, onStartCommand):再绑定服务(…

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.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…

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…

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…

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…

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…

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…