tutorials

I'm new to Android development and I'm currently building my first real app. I'm trying to implement a MVVM architecture and because of that I'm having a viewModel for each fragment and each viewModel has a viewModelFactory. At least, this is how I understood it has to be.

I use the boilerplate code everyone seems to use for the factory:

I need to show error message in OutlinedTextField and I don't find any documentation about how to do it. I found several ways in tutorials, for example to create custom input field with hint or create Text just below input field, but they very old and maybe there is a better way. I need show error message like this:

Code:

I am working through the Microsoft Learn tutorials to "Create a web API with ASP.Net Core".

Under the heading, "Build and test the web API", at instruction (5) I am getting a response, "Unable to find an OpenAPI description".

For step (6) when executing the "ls" command I get the response, "No directory structure has been set, so there is nothing to list. Use the 'connect' command to set a directory structure based on an OpenAPI description". I have tried the "connect" command suggested here and have tried "dir" as an alternative to "ls".

I can successfully change directories in step (7) and execute the GET request for step (8) and receive the expected reply. However, it really bothers me the "ls" command is not working here and seems like an important function of the httprepl tool.

How can I get the "ls" command to work here or tell me why does it not work?

I am learning how to write a Maximum Likelihood implementation in Julia and currently, I am following this material (highly recommended btw!). So the thing is I do not fully understand what a closure is in Julia nor when should I actually use it. Even after reading the official documentation the concept still remain a bit obscure to me.

For instance, in the tutorial, I mentioned the author defines the log-likelihood function as:

I intend to develop my smart contracts in Hardhat, and to test them on RSK regtest local node. I was able to find a Truffle regtest configuration.

I have a Vue-cli app that I'm trying to convert to vite. I am using Docker to run the server. I looked at a couple tutorials and got vite to run in development mode without errors. However, the browser can't access the port. That is, when I'm on my macbook's command line (outside of Docker) I can't curl it:

I am trying to try a sample project in Flutter integration email and google based login, and planning to use firebase initialisation for doing it while I have followed all the steps as mentioned in tutorials I am getting this error as soon as firebase is attempted to be initialised.

I've successfully written my application using Axios to fetch content. As of now, it's set up to fetch content when certain events happen (like the submit button has been clicked.) However, I'm experimenting with Redux's RTK-Query solution. This package generates hooks and in their examples, they provide simple component-level examples that call the hooks on mount.

How can I leverage these rtk-hooks (and hooks in general) so I can tie them to behaviors like onClick, onSubmit, and conditional events? I'm aware this conflicts with the rules-of-hooks guidelines, but I can't imagine RTK-Query would be so limited as to only allow component-level onMount API calls.

some related articles I'm reading while I try to figure this out / wait for a helpful example:

• https://blog.logrocket.com/react-hooks-frustrations/
• https://redux-toolkit.js.org/rtk-query/usage/usage-without-react-hooks

The second article seems somewhat relevant but I feel like its beating too far off the path and is making question if it's even worth having rtk-query installed. I might as well just use axios since it can be used anywhere in my components and logic. Can someone educate me on how to approach this problem? I'm new to rtk-query, it seems really cool but it also seems really restrictive in its implementation approaches.

I am trying to model credit card data in JavaFx using a GridPane:

My model contains 3 rows (Note: each field is comprised of label + text field):

Row 1: First name and last name (4 fields)

Row 2: Credit card number (2 fields)

Row 3: Expiration date - month, year + CVV (6 fields)

See screenshot below:

I was reading this tutorial which states:

All cells in the same row will have the same height, and all cells in the same column will have the same width. Different rows can have different heights and different columns can have different widths.

Are there any workarounds to to have different size columns on a row by row basis in a GridPane?