Develop Reference

Clean architecture when developing SDKs

I'm developing an SDK with Kotlin (I intend to use the multiplatform function). This product will be integrated into the application through a dependency (like any current library).
The point is that I can't find information that explains how to structure this kind of projects. I would like to know if there are architectures similar to clean architecture for applications, but focused on these other needs.
The SDK contains a view (that the user can instantiate externally), internal logic and calls to a server. Does anyone who has faced this problem have any information?

How to add Models in Camera View in Android Studio?

I'm developing Augmented Reality base Application in android.
In which I want to add model or image when camera view open.
How can I do that with Android Studio?
I know there are libraries like vuforia but I don't want to use library.

Do you want image recognition or just to place an image in an AR scene?
ARCore by Google supports augmented reality and allows you to orient the device in the world, but does not yet support image recognition, so no detecting an image. To do image recognition, you'll need to use an external library/service (like Vuforia which you mentioned above).
If you want to use iOS, ARKit 1.5 (coming out in iOS 11.3) will support Image Detection.
If you want to build cross platform, check out my company's product Viro React which enables you to build a cross-platform AR/VR application. We'll support both ARKit and ARCore features as they come out. It's free and easy to use!

Is there a way to have Vuforia and ARCore in the same app?

We are currently developing an app for a student project, that we want to enable to use ARCore and ARKit on Android and iOS respectively and Vuforia as a fallback. After my project partner has already implemented ARKit and Vuforia in two separate scenes, I'm now trying to add ARKit.
But when trying to add both to the Android build under Player Settings -> XR Settings, I get the following message:
We would like to be able to allow users to always be able to fall back to Vuforia, but use ARCore on compatible devices. Is there a way to have both in the project at the same time?

AFAIK you would be able to do this if you're building Unity scenes into an android app built in Android studio or some other way. You would have a check for ARCore support on the device, and if that passes you would load a Unity scene that has ARCore support. If that does not pass you load another Unity scene that uses Vuforia. If you're working only in Unity like I am, I do not think it is possible. I could be wrong, though.

You have to go to the vuforia settings and select the option "Do not use" the Ar core requirement, the app build will proceed normally and the app will work without errors

Google Cardboard simple App

I have created 3d models of some objects and see them correctly using cardboard through sketchfab.com without any difficulty.
I can see them as a VR model exactly what I wanted.
But I dont know how to create a standalone android app using my 3d model.
I am just looking for a template mobile application where I will place my model and see them as a mobile app through cardboard.
Any recommendation for an early start?

After lots of research, I found out the best solution is using Unity3D application. There are plugins to assist with cardboard app development. I created my first app very easily within minutes of using a demo carboard application. Now I am enjoying and learning Unity3D

The cardboard example? Might be a bit of hacking to chop out their block model and replace it with your art but it shouldn't be a mountain of work
https://github.com/googlesamples/cardboard-java

Is there Android native library for displaying charts/graphs?

I want to know, is there Android native library for displaying charts and graph.
I know there is third-party like GraphView, WilliamChart and Hello Charts, but I found Google Adwords android app that have charts, and want to know does Google developed their own library or no.
All posts that I found is too old like 1-4 years.
Thanks in advance

I am going to guess that "Android native library" means "part of the Android SDK".
In that case, no, there is no charting and graphing library, akin to the third-party ones that you listed, in the Android SDK.
want to know does Google developed their own library or no
It is entirely possible that Google developed their own charting and graphing library. It is not part of the Android SDK, at least at this time, and I am not aware that they released it as their own library (open source or otherwise).