How PWA - Serviceworker (React) works? [closed] - progressive-web-apps

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I have a question about how to shape PWA applications. I understand that Serviceworker help web apps to be like an application offering offline features and more.
So, can I create one for mobile and another one for the PC web browser to provide it with the same domain by recognizing types of hardware - how typical website works? Or, if I want to create PWA, then it must be dedicated to mobile service only?

You don't have to create separate web apps for mobile & desktop.
Just create a responsive web app and make it progressive by adding the manifest & service worker.
It isn't specific to mobile or desktop.
It's a website after all.
You open it in any supported browser, it will work.
You can either use it as a conventional website or a PWA (If the browser supports)

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How could I create a hosted database to store data from my iOS app? [closed]

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im în my first year of software developing. Im trying to create an iOS app where I will have some authenticate and other databases query to do. How could I create a hosted database that users could authenticate and retrieve different informations from it?
You can have a look at different MBaaS solutions (Mobile Backend as a Service), the most prominent of which are possibly:
AWS Amplify
Firebase (Google)
Azure Mobile Apps
They provide very simple ways to create a complete and secure backend for Mobile and Web Apps with Authentication, APIs, Data Storage and others.

Is using flutter for both mobile and web for a social media platform feasible? [closed]

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I'm new to flutter and I'm planning to create a social media platform something like Twitter, Instagram, or TikTok. I plan to use flutter for its web and mobile. But from what I can see since Flutter web is still in its early stages is it really achievable/feasible/practical(I don't what term to use) for the platform to only use flutter? Or is it much better to separate the web and mobile like using react/angular for the web and flutter for mobile? Also, Can you also provide what are the pros and cons for both scenarios?
Although flutter web is in its early stages, this platform has had an unstable version for a relatively long period and now, it has stable web release. Definitely, it has some challenges and specially lack of documentations for web version (due to its novelty), but it has power to provide reliable results. So, I think, yes you can use Flutter for your client-side. However, there are some difficulties in this platform that you can handle with native code as well.

How architecture should be for my mobile app [closed]

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I'm planning to improve a mobile app as my first mobile and published project and I want to improve a to-do list app. According to this aim I want to use java for backend and one of my friend will improve front-end with flutter.
The first question is here, can we develop a mobile app with using flutter and java at the same time ?
If the answer is yes, I am planning to use SQLlite for database but here I am confused :/. I want to use the database for each user own local database.
How can I deploy a database with my project , the database should work in his/her mobile local. And how the architecture should be?
Thanks,
You can develop Flutter app with native (Android or iOS specific) implementations for some platform features. Flutter and native side communicating with Method Channels (by link you find an official documentation for work with it).
Flutter has a sqflite plugin that wraps native database realization and giving to you interface for working with SQL database on Flutter side.
Also, if you need tools for communicate with WEB API, Flutter supports it by default. You can find more information in Fetch data from the internet.

social login in a website using a mobile app [closed]

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I have a website that is supporting a normal email/password authentication, as well as twitter, g+ and fb logins.
We are starting to develop a mobile app using phonegap that will talk directly to the website.
My question is: what is the best way to secure the social logins and link them against the website?
We are communicating with the webapps using rest services and we started implementing the oauth authentication on the app side, but is this the best way to go?

IPhone and Android website design [closed]

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How do you design and build your website to make it usable on both IPhone and Android, does it have to be pure html?
Both run modified webkit (the base of chrome and safari) based browsers. They're capable of running full javascript. You'll want to avoid using any browser plugins (like flash) since they're not really supported on these platforms.
They other big concern is the layout. They don't have as much screen space as a typical computer screen and they don't have the same type of input devices. Avoid requiring users to type a lot if it's not required.
Some Andriod phones and the iPhone also support HTML 5 so you can use its capabilities.
Your website should be designed in a way that it properly runs on chrome and safari, as they both are used by many users. The website should be compatible with smartphones as it will help in SEO strategies.