Android OS Architecture

Overview of the Android Architecture layers and components:
- Kernel layer
- Hardware abstraction layer
- Native libraries
- Android Runtime layer
- Application framework layer
- Application layer

In addition to it during this talk, we will talk about the difference between JVM, Dalvik and ART; Linux and Android security model and trends of Android.

Transcript

1. Android OS Architecture @Alex_Zhukovich
2. https://en.wikipedia.org/wiki/Andy_Rubin https://www.gv.com/team/rich-miner http://www.seriousbiz.com https://andro4all.com/2018/03/creadores-android-actualidad
3. https://en.wikipedia.org/wiki/Google_logo https://opensource.org https://en.wikipedia.org/wiki/Open_Handset_Alliance
4. Android versions • • • • • • • • • • • • • • •
5. Android Architecture
7. Kernel level
8. Hardware abstraction layer
9. Native libraries
10. Android Runtime
11. Application framework
12. Application layer
14. Dalvik vs ART
15. Why do we need a Virtual Machine? VM
16. Compilation JVM vs DVM Java Compiler (javac) Java Source Code (*.java) Java Bytecode (*.class) Java Virtual Machine Java Source Code (*.java) Java Bytecode (*.class) Dalvik Virtual Machine Dalvik Bytecode (*.dex) DEX Compiler Java Compiler (javac)
17. Dalvik (Just In Time) vs ART (Ahead of Time) Installing Run Running... Compile Installing Run Running... Compile
18. ART Benefits: • • • Drawbacks: • •
19. Security
20. UID/GID - Linux
21. UID/GID - Linux
22. UID/GID - Android <permission name="android.permission.INTERNET" > <group gid="inet" /> </permission> https://android.googlesource.com/platform/frameworks/base/+/master/data/etc/platform.xml
23. Resources
24. Sharing data and resources between applications
25. Sharing data and resources between applications android:sharedUserId="com.example.test.sharedUID"
26. Sharing data and resources between applications android:sharedUserId="com.example.test.sharedUID"
27. SharedPreferences isolation
28. SharedPreferences isolation /data/data/package_name/shared_prefs/
29. /data/data/package_name/shared_prefs/prefs <?xml version='1.0' encoding='utf-8' standalone='yes' ?> <map> <int name="theme" value="0" /> </map> val sharedPreferences = getSharedPreferences( "prefs", Context.MODE_PRIVATE) sharedPreferences .edit() .putInt( "theme", 0) .apply()
30. Database isolation /data/data/package_name/databases/
31. Trends
33. Q&A 1. 2.