Android Framework - Creating custom HIDL in Android

Hi All,
In this video, I explain the steps to create custom HIDL in Android, Seeing this you all can try out and get an understanding how the HIDL is created and how few files are auto-generated for us

[@pavitrad7147]

Hi Dimple, good explanation on custom HIDL.Great job

[@mdrashid6002]

Big wala thanksss, it really helped.
Better if you can provide the client application using this hidl.
East or West, Dimple Framework is the best👌

[@hemantsoni2507]

Hi,
I dont have words to say thanks to you, to make this sooo simple
Thank you soo much

[@dimples_android_geek]

Your welcome 🤗

[@amitchaturvedi2246]

Good Work Dimple.

[@dimples_android_geek]

Thank you

[@AiBrOn]

Nice job! I have always wondered how that works

[@dimples_android_geek]

Thank you! Cheers!

[@vvvkkkvvv]

Good , It helps a lot, God bless you with success.

[@dimples_android_geek]

Glad it helped. Thank you

[@rk-eg3km]

Hi Dimple,
First of all a big Thanks to you for covering up this topic, I have few quarries.
1 I can see the hardware folder along with default, what it contains?
2 Which hardware (driver) you are targeting to read, write and where exactly we are doing that?
3 What about sepolicie?
4 I know its tough to gather all the information in one place, could you please share any link or documents for Android 10 or latest version if you have, it will be very helpful?

[@dimples_android_geek]

Hi, Hardware folder im not aware of it, need to check . Currently since this is demo, i have not targeted any hardware. , I followed Opersys by Karim

[@cid007007]

At 15:17 in default Android.bp we need to change cc_library_shared to cc_binary and also need to change service name from -impl to -service in default Android.bp if we want to make it binderized hal...
Also, don't we need service.cpp in default folder and rc file ?
In device specific folder we need to add that binderized service name in PRODUCT_PACKAGES of target.mk file..
Also we need to take care of adding selinux permissions if we run it in enforce mode..

[@dimples_android_geek]

Hi Dev thank you for ur inputs.. yes we need to add service.cpp and RC file if we want to use binderized approach .. and yeah I did not cover abt selinux in this video ...

[@hemantsoni2507]

Thanks for showing the difference

[@Ankitasaini-nu4zo]

Hi Dimple, Thank you so much, can you please tell us how HIDL further communicates with System service? I heard, will have to do HAL customization in vendor folder, can you please tell me why all processes happen in hardware/interface folder?
Thankyou!

[@dimples_android_geek]

Hi , all the hardware and it's customizations are maintained in these two folders hardware and vendor .. it's a standard followed by Google so evrything is at one place and not scattered around .. Hidl uses calls and connects to aidl wch. In turn talks to system services

[@SushilKumar-pq5ff]

If I am not wrong I see there is one current.txt file in my aosp repo which contains hash key value of a project so that it will prevent any accidentally change in any repo. Once you have made any changes in any hal file you have to update the new generated has key in the current.txt file.

[@dimples_android_geek]

Thanks Sushil, i was not aware of this

[@rishabhgupta2741]

Yes Sushil you are correct you need to update the current.txt after changes in your Hidl implementation. You can you hidl-gen command to generate the hash i guess.

[@karthikeyant4459]

Hello!!
Can you please upload a video on Android S Migrations & How to create my own Android HAL AOSP Architecture

[@dimples_android_geek]

Will try

[@shalinisharma3446]

Hii dimple you didn't show how you have genrated hardware folder in TH-camDimple/2.0 .

[@dimples_android_geek]

Manually

[@vaishnavviju3750]

which terminal or tool are you using to run these commands

[@dimples_android_geek]

Mobaxterm if you are working on windows... In Linux machines u can use normal terminal

[@dimples_android_geek]

U can also use putty

[@vaishnavviju3750]

Can I use oracle virtual box to run linux machine in windows

[@Deepak-wv4ub]

New .hal will not work from android 12.
Only new .aidl can be added.

[@dimples_android_geek]

Yes

[@SushilKumar-pq5ff]

Yes you are correct as I know version is not required for devices having OS less than 11.

[@bluesman3612]

I think that is enforced from android 13.

[@dimples_android_geek]

@@bluesman3612 it's from Android 12