geticon | social icons mania use | Icon library

I'm trying to follow this tutorial: https://codelabs.developers.google.com/codelabs/admob-inline-ads-in-flutter#7
I copied this code into a class named ListTileNativeAdFactory

Using React-Leaflet V3.1.0 with an Express server.

My users have requested the ability to use a link in the following format:

https://www.mymap.com/id/:category/:id/:zoom

This sends a request to the server to get the lat/lon coordinates of the marker they're linking to and then sets the start location to those coordinates. I've managed to get this part working using React Router Dom. Now ideally, I would like to be able to have the popup for this particular marker opened upon map load. With the way I have the query component setup, it's not a problem to be able to pass a boolean value through props while generating the markers to indicate that this is the marker of interest, I'm just not sure how to activate the popup.

I'm not very familiar with useRef and how it can be used exactly to access the different Leaflet methods but I did some experiments yesterday and was able to get some behavior that seems to be a step in the right direction. The popups didn't load on initial startup but as I navigated around the map, other popups started opening automatically. That being said, my map renders thousands of markers and going beyond 1 render per marker isn't going to be worth the trade off of this relatively niche feature, unless a second render can be isolated to only the marker of interest.

The method that I think would get me to where I want but I couldn't get this specific one to fire: https://leafletjs.com/reference-1.6.0.html#popup-openon

I ended up using openPopup() similar to this link: https://stackblitz.com/edit/react-awtgn6?file=Map.js

But I was only able to get that to somewhat (results mentioned above) work with a useEffect + useRef.

I feel like I'm missing something obvious when it comes to storing the popup open status in state?

Basic code example:

I have a Weather app that searches for any city typed on the EditText and it works very well. But the problem is that the app crashes and reports "(my app) has stopped" on my phone whenever I search for an unavailable city or I leave the EditText empty and click the search button(this only happens when I search an unavailable city/no city is searched), It can search any valid city correctly.

Here's what my Logcat displays(only when an unavailable city is searched):

I have created simple component palette using JLabel with ImageIcon. That's the code of the palette item:

I have a code that is used to select certain elements, the code works great when you onSelect and it shows the right option value. The problem is I am not sure how to show the selected option when we search a value onSelect of the dropdown then it's not working.

Here is my Jsfiddle

While I know this may look like a duplicate with how many different posts there are about this error but I am getting this error for (which I assume) are different reasons on four different screens.

My app launches but I end up getting the Red screen error whenever I try to navigate my app because it says a widget within the screen used a Null Check operator on a null value.

Here are the errors I've gotten:

The following _CastError was thrown building NotificationBanner(dirty): Null check operator used on a null value. The relevant error-causing widget was: NotificationBanner file:///Users/alexm/carebloom-flutter/lib/Views/homeview.dart:9:7

The following _CastError was thrown building AlertBanner(dirty): Null check operator used on a null value. The relevant error-causing widget was: AlertBanner file:///Users/alexm/carebloom-flutter/lib/Views/alerts_view.dart:57:15

The following _CastError was thrown building MessageOverView(dirty): Null check operator used on a null value. The relevant error-causing widget was: MessageOverView file:///Users/alexm/carebloom-flutter/lib/widgets/navbar.dart:41:16

This one is a little different

The following _CastError was thrown building SettingsView(dirty, dependencies: [_EffectiveTickerMode], state: _SettingsViewState#ddb1e(tickers: tracking 1 ticker)): Null check operator used on a null value. The relevant error-causing widget was: SettingsView file:///Users/alexm/carebloom-flutter/lib/widgets/navbar.dart:49:16

Now I assume that the errors lie within the whatever widget came back as WidgetName(dirty). SO the code for each of those is below. However I'd like to also ask some questions on top of all this just to better my understanding and help me diagnose issues in the future. When it has WidgetName(dirty) what exactly does that mean what is (dity)? Besides the error message showing a specific widget it also gives 'The relevant error-causing widget path, is that the one I should be looking at?

NotificationBanner:

I am trying to optimize a component of mine with dynamic rendering, but I'm facing some issues, so this is my current situation:

I have an Alert component that renders an alert message, along with an icon.

I have a Icons module, which is a library of icons

I am currently rendering the icon as follows (this is not actual code, it's just to give the idea):

I have this HTML where I need to seperate each row, how can I do this?

This is what I have:

I am working with javaFX on inteliJ using javafx-sdk-11.0.2. I made a GUI for a cinema and when I want to run it on inteliJ, everything works fine. But when I create a jar file and I execute it then everything works fine again until I click on a button for switching from scene.

That is what I get when clicking on the button. Note that not all buttons have the same problem. I have some buttons that work fine while I am using the same code everywhere.