Sharing data across devices - Kotlin - android

I'm developing an app for a term project (so forgive me if this is a moronic question) and I'm wondering how to save data for a user and share to a different device but same user. E.g. someone logs in on their phone logs their information how can it be pushed to their tablet? I'm leaning towards just making it an android only app and using kotlin & android studio however, if someone knows of a solution in a different language and/or using a framework like flutter I'm open to it.

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Building decompiled APK in Android Studio

I purchased a smart medical device by a company called Contec to help monitor my grandfather's health (specifically, a urinalysis tester - he has kidney failure). The device is great, but the Android app itself (com.contec.phms) is abysmal - it will collect readings from the devices via Bluetooth, but there is no way to export the data to take to the doctor. I have tried contacting the app developers, but they have not responded.
I am pretty handy with Linux, but I can't figure out how to interface with these products without the app. I'm not much of an Android developer, but I know enough to hack small changes to existing apps. If I could decompile this app, I'm sure I could trace the data and at least figure out a way to export to CSV. I have tried a few common decompilers, but I can't get the app to cleanly build in Android Studio. I don't know if this is against forum rules since this is for personal use, but could someone help?

Any idea of the IDE or framework that was used to develop the application?

So I am a freelancer who is tasked of adding new changes to an already existing app. However, the person who hired me does not have any information about how the app was developed. He said he hired another freelancer to help develop it for him. I am trying to rebuild his app but the trouble is that I cannot seem to understand which IDE or framework he was using (xamarin, react-native or flutter) to develop his app. I am getting several errors all over the place. For example, referring to the picture below:
Looking at the first image, you can see that I am getting an error with android:colour=resourceId:0x106000b. Based on my experience with android development, I have never seen this syntax. The same case for the picture below:
Same case here, I am not sure what tools did the previous developer used because I never seen the format resourceid:#x#######b assigned before. Can someone help me with this?
EDIT: I am using Android Studios to develop android applications and have been using only that. I am kind of new to android development
EDIT: May I ask what this means?

Is there any option for sharing keychain data across multiple apps with different appbundles/appId's in flutter

I am developing two mobile applications using flutter targeting both android and ios with different appId's and I want to share keychain's data among these applications. Is there any such way to approach this. I have started trying intent approach for android since one week and nothing turned successful. Would be great to have any help!

How do I connect a webapp and an android app with firebase?

I have been trying to learn how to create an app that allows people to upload images via the web or android.
I know that Android uses content providers to implement a mechanism for the sharing of data between applications. More specifically, Android uses the MediaStore API to make use of this functionality. However, that is limited to other Android devices.
I was wondering how I would go about connecting a web app made using reactjs to an Android app preferably using firebase. However, if it isn't possible in firebase that would be okay too,
I am a beginner in web app development, so I am not particularly sure about how the software's architecture will look like.
I have been struggling to find an updated concise solution online. Can anyone point me in the right direction and if not point me to some resources that will guide me in the right direction.
Thank you!
Attach/configure both of your application to use same database and storage bucket in firebase
As you can see I connected my android application as well as web administration application to same firebase project.
As you can see there is an add app option in firebase console where you can select platform. Register both of your application on same project and thats it.

Need directions

I need some directions and advice. :)
I have a project for a mobile app in mind (look below), but am confused about all the different programming languages, frameworks and so. Confused about what to focus on.
Also, I'm not sure if I should focus on a solution specifically for this project or just try to get good at developing mobile apps in general?
I have learned the basics of JavaScript and Swift. Have never tried working with a framework.
The app has to be able to do the following:
Store user data (strings and numbers)
Show various graphs and stats based on the user data
Look like a native iOS/Android app (e.g. like iTunes and App Store with the menu at the bottom)
Send push messages to the user
Ideally work for both iOS and Android
I’m of course looking for as easy and fast a solution as possible, but more important is that the solution looks and works like a quality app.
So, which solutions would be best for the project above? And what about developing apps in general? (or does it vary from app to app?)
This is a very basic question, and I would suggest getting familiar with iOS/ Android development in general before making your own app.
There are tons of great tutorials out there on how to do both, I would suggest getting started with either one based on what equipment you have available and what you're familiar with.
If you want to make an app that runs on both platforms you could make it in HTML5, but I'd suggest making a native iOS app in either Obj-C or Swift, and a native Android app in Java.

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