Difference between revisions of "Android Concepts"
(→Android Architecture) |
(→Android Architecture) |
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Key principles | Key principles | ||
| − | '''1. Linux Kernel''' - proven driver model, memory and process management, etc. ( | + | '''1. Linux Kernel''' - proven driver model, memory and process management, etc. (all the core services of a reliable operating system) |
'''2. Libraries''' (written in C/C++) | '''2. Libraries''' (written in C/C++) | ||
| Line 43: | Line 43: | ||
3.2 Dalvik Virtual Machine runs '''dex files''' (bytecodes efficient for small processors) | 3.2 Dalvik Virtual Machine runs '''dex files''' (bytecodes efficient for small processors) | ||
| − | '''4. Application Framework''' | + | '''4. Application Framework''' written completely in Java Programming Language |
| + | |||
| + | {| class="wikitable" border="1" | ||
| + | ! Application !! Functionality | ||
| + | |- | ||
| + | | '''Activity Manager''' || life cycle of an application - common back stack | ||
| + | |- | ||
| + | | Package Manager || keeps track the applications installed of the device | ||
| + | |- | ||
| + | | Window Manager || an abstraction layer on top of surface manager | ||
| + | |- | ||
| + | | Telephony Manager || Api for telephony applications | ||
| + | |- | ||
| + | | '''Content Providers''' || application framework that allow applications to share data | ||
| + | |- | ||
| + | | Resource Manager || used to store localized layouts, strings, bitmaps, etc. | ||
| + | |- | ||
| + | | View System || building blogs of the UI, handles the event dispacher, drawing, etc. | ||
| + | |- | ||
| + | | Notification Manager || anables apps to recognize and display common alerts in the status bar | ||
| + | | | ||
| + | |} | ||
Revision as of 11:53, 8 March 2011
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What is Android
Android is a software product for mobile devices that has three major parts:
- operating system
- middleware
- applications framework
Android Architecture
Here are the major components based on this [source]
Key principles
1. Linux Kernel - proven driver model, memory and process management, etc. (all the core services of a reliable operating system)
2. Libraries (written in C/C++)
| Component | Responsability |
|---|---|
| Surface Manager | composing drawing surface onto the screen |
| ES & SGL | core of graphics libraries |
| Media Framework | core media: mpeg, mp3, all video formats, etc. |
| FreeType | an engine for rendering fonts |
| SQLite | core of data storage |
| WebKit | an open source web browser engine |
| SSL | security socket layer |
3. Android Runtime
3.1 Core Libraries written in JAVA such as: utils, collection, i/o, etc.
3.2 Dalvik Virtual Machine runs dex files (bytecodes efficient for small processors)
4. Application Framework written completely in Java Programming Language
| Application | Functionality | |
|---|---|---|
| Activity Manager | life cycle of an application - common back stack | |
| Package Manager | keeps track the applications installed of the device | |
| Window Manager | an abstraction layer on top of surface manager | |
| Telephony Manager | Api for telephony applications | |
| Content Providers | application framework that allow applications to share data | |
| Resource Manager | used to store localized layouts, strings, bitmaps, etc. | |
| View System | building blogs of the UI, handles the event dispacher, drawing, etc. | |
| Notification Manager | anables apps to recognize and display common alerts in the status bar |
