Android AIDL Concept
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This document introduces Android AIDL (Android Interface Definition Language), which allows for inter-process communication (IPC) between Android applications. It discusses writing AIDL interface and implementation files to define service interfaces and how to use AIDL to allow an app's services to be bound by other apps. The key aspects covered are the supported data types in AIDL, how AIDL addresses IPC memory issues, and how to generate AIDL interface implementations to make remote calls between processes using AIDL.
Android AIDL Concept
- 1. Android AIDL Concept Charlie Tsai @ Android Study Group
- 2. Charlie Tsai @ Android Study Group cha122977@gmail.com Software Engineer
- 3. Agenda • Introduction of AIDL • Write your AIDL files • Implementation 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?)
- 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. • IInterface: 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?
- 20. Thanks!