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Add Services lifecycle image (#22532)

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Jongkook
2018-11-26 02:40:06 +09:00
committed by Randell Dawson
parent 44b5ccaa72
commit 6b961cd407
1 changed files with 8 additions and 5 deletions
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guide/english/android-development/core-components/index.md
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@ -98,15 +98,18 @@ public class MainActivity extends Activity {
A _service_ is a component without a user interface, and is used to perform long-running operations in the background. A _service_ is a component without a user interface, and is used to perform long-running operations in the background.
There are three kinds of services: There are three kinds of services:
- _foreground_ services: they are strictly related to user's interaction (for example music playback), so it's harder for the system to kill them. - _Foreground_ services: they are strictly related to user's interaction (for example music playback), so it's harder for the system to kill them.
- _background_ services: they are not directly related to user's activities, so they can be killed if more RAM is needed. - _Background_ services: they are not directly related to user's activities, so they can be killed if more RAM is needed.
- _bound_ services: they are offers a client-server interface that allows components to interact with the service, send requests, receive results, and even do so across processes with interprocess communication (IPC). - _Bound_ services: they are offers a client-server interface that allows components to interact with the service, send requests, receive results, and even do so across processes with interprocess communication (IPC).
### [Services Lifecycle](https://developer.android.com/guide/components/services#Lifecycle)
![Services Lifecycle](https://developer.android.com/images/service_lifecycle.png)
### [Broadcast receivers](https://developer.android.com/guide/components/broadcasts) ### [Broadcast receivers](https://developer.android.com/guide/components/broadcasts)
A _broadcast receiver_ is another component without user interface (except an optional status bar notification) that provides a gateway for the system to deliver events from/to the app, even when the latter hasn't been previously launched. A _Broadcast receiver_ is another component without user interface (except an optional status bar notification) that provides a gateway for the system to deliver events from/to the app, even when the latter hasn't been previously launched.
### [Content providers](https://developer.android.com/guide/topics/providers/content-providers) ### [Content providers](https://developer.android.com/guide/topics/providers/content-providers)
A _content provider_ is a component used to manage a set of app data to share with other applications. Each item saved in the content provider is identified by a URI scheme. A _Content provider_ is a component used to manage a set of app data to share with other applications. Each item saved in the content provider is identified by a URI scheme.
For detailed information about the topic, see the official [Android fundamentals](https://developer.android.com/guide/components/fundamentals) documentation. For detailed information about the topic, see the official [Android fundamentals](https://developer.android.com/guide/components/fundamentals) documentation.