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
   

   View Slide

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
   

   View Slide

3. https://en.wikipedia.org/wiki/Google_logo https://opensource.org https://en.wikipedia.org/wiki/Open_Handset_Alliance
   

   View Slide

4. Android versions
   ●
   ●
   ●
   ●
   ●
   ●
   ●
   ●
   ●
   ●
   ●
   ●
   ●
   ●
   ●
   

   View Slide

5. Android Architecture
   

   View Slide

6. View Slide

7. Kernel level
   

   View Slide

8. Hardware abstraction layer
   

   View Slide

9. Native libraries
   

   View Slide

10. Android Runtime
    

    View Slide

11. Application framework
    

    View Slide

12. Application layer
    

    View Slide

13. View Slide

14. Dalvik vs ART
    

    View Slide

15. Why do we need a Virtual Machine?
    VM
    

    View Slide

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)
    

    View Slide

17. Dalvik (Just In Time) vs ART (Ahead of Time)
    Installing
    Run
    Running...
    Compile
    Installing
    Run
    Running...
    Compile
    

    View Slide

18. ART
    Benefits:
    ●
    ●
    ●
    Drawbacks:
    ●
    ●
    

    View Slide

19. Security
    

    View Slide

20. UID/GID - Linux
    

    View Slide

21. UID/GID - Linux
    

    View Slide

22. UID/GID - Android
    
    
    
    https://android.googlesource.com/platform/frameworks/base/+/master/data/etc/platform.xml
    

    View Slide

23. Resources
    

    View Slide

24. Sharing data and resources between applications
    

    View Slide

25. Sharing data and resources between applications
    android:sharedUserId="com.example.test.sharedUID"
    

    View Slide

26. Sharing data and resources between applications
    android:sharedUserId="com.example.test.sharedUID"
    

    View Slide

27. SharedPreferences isolation
    

    View Slide

28. SharedPreferences isolation
    /data/data/package_name/shared_prefs/
    

    View Slide

29. /data/data/package_name/shared_prefs/prefs
    
    
    
    
    val sharedPreferences = getSharedPreferences(
    "prefs",
    Context.MODE_PRIVATE)
    sharedPreferences
    .edit()
    .putInt( "theme", 0)
    .apply()
    

    View Slide

30. Database isolation
    /data/data/package_name/databases/
    

    View Slide

31. Trends
    

    View Slide

32. View Slide

33. Q&A
    1.
    2.
    

    View Slide