Sending data to a server is extremely important, as without it, you cannot search/lookup data, add new data, make changes, or even potentially remove data. We’ll build off the idea of our last two examples of getting data from an Internet server with Flutter. And if we send data to a server, we’re almost always…
By default most of what we do in Flutter is single threaded. This works fine for simple tasks, but complex tasks, or tasks that have lots of steps might cause the application to become “jerky”. Parsing a large amount of JSON data is an example of something that might cause an app to slow down,…
Most apps will need to get some sort of data from the Internet. If you think about how much data there is, you would never want to update an app to store all of the data in your app. It would make your app both unnecessarily large and you would be updating it all the…
Polymorphism is the idea of an object being able to “look” or “act” like other types of objects. Now you might wonder why an object should “look” like another type of object, or even how it can look like another object. Polymorphism exists when you have is-a style relationships. So if you have a class…
A Java Interface, as first glance, may look similar to a class. However, there are important differences, not only in how it is used, but in defining it from a class that make it worth noting. Uses of an Interface Java prevents a developer from extending a Class with two or more classes. This is…
We’ve looked at the TextFormField in Flutter, almost exclusively at this point. However there are other form fields. These are often styled to work appropriately on a mobile device, so while they might seem like a web form field, it may look different. Toggle Buttons – Collections of buttons which can be toggled either to…
In our previous example, we saw how to get the text field value when we the field was changing, but what about if we want to get it on demand, like when we press a button? Turns out, it is a similar process as to what we just did. The FloatingActionButton First, in our app…
Being able to work with a form field, to get values, know when it has been updated, etc, are important aspects for any form work. In this example we’re going to look at detecting when a TextFormField changes and getting those values. We are going to use the previous example of Form Fields in Flutter….
