Here's the first one with a little index of what is discussed and my take away from the video.
00:40 Linux Kernel
01:09 Native Libraries
03:09 Android runtime
04:13 Core libraries
04:31 Application framework
07:25 Application building blocks
09:37 Example of re-using components in Android
12:18 Conclusion and resources
Architecture wise the Android platform has several layers:
- Linux Kernel
- Native Libraries
- Android Runtime
- Core Libraries
- Application Framework
The Linux Kernel was chosen because of it's stability, services, security, and presence of several device drivers.
Native Libraries consist of various components for rendering graphics and fonts (Surface Manager, OpenGL, SGL, Freetype), a lightweight database engine (SQLLite), a browser engine (WebKit), and others.
The Android Runtime consists of Dalvik the Java Virtual Machine created by Google, which is optimized for running on embedded devices which have low resources. Dalvik runs *.dex files which are created by converting *.jar and *.class files. On top of Dalvik are the core Java libraries consisting of things like the Collections, IO API, etc.
Then the Core libraries layer consists of components such as Activity Manager, Resource Manager, Package Manager, Content Provider, Telephony Manager, XMPP, etc.
Android applications typically have 4 building blocks, which applications mayor may not use. These are:
- Intent Receivers
- Content Providers
In the next few blog posts I will be embedding more Android videos along with my learnings.