Android AIDL Concept

Shared on Android Taipei in 2016 Dec 19th

1. Android AIDL Concept Charlie Tsai @ Android Study Group

2. Charlie Tsai @ Android Study Group [email protected] Software Engineer

3. Agenda Introduction of AIDL Write your AIDL files Implementation of AIDL

4. Introduction of AIDL

5. ?AIDL? Android Interface Definition Language Main approach is IPC (Inter-Process Communication) Support types: All primitive types, CharSequence & String, List & Map, Parcelable class

6. IPC Issue Memories of Process A Process B of Process B X Cannot Access (Memory protection by Kernel)

7. How AIDL solve IPC issue Memories of Process A Process B of Process B Linux Kernel & Binder Driver Access Access

8. Write Your AIDL File Write *.aidl for your AIDL interface You can turn your Parcelable Class into AIDL Include if you use Other AIDL class/interface Note: List will become ArrayList in another side Map will become HashMap in another side (WHY?)

9. AIDL Data Structure MyData.java MyData.aidl

10. AIDL Interface IMyAidlInterface.aidl

11. How Parcelable Work

12. String int Data in memory (order is matter)

13. Usages of AIDL

14. Export Your Service Allow to be bound by other App.

15. Use Other’s Service Copy *.aidl file into your project (Because you need to know this Interface)

16. Generated File by AIDL

17. I Interface: Basic interface can be used for IPC android.os.IBinder: Core class of IPC Use YourInterface.asInterface(IBinder) to case IBinder to YourInterface. Use IBinder.queryLocalInterface() to know if this IBinder is in local or remote. If IBinder is in local, call function directly. If IBinder is a remote object, use transact and parcel to call function. Let’s see the source code…

18. Questions?

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20. Thanks!