Google’s Flutter is the best way to make mobile apps that can run on multiple platforms. Because Flutter is so popular with developers, it has had a steady stream of maintenance releases, with Flutter 3 being the most recent. Today, we’ll talk about what these best practices are so that you can make making an app with Flutter easier.
Table of Contents
How to Make a Flutter App That Works
In this guide, you’ll learn how to make your Flutter code the best it can be in terms of quality, readability, ease of maintenance, and productivity. Then, hurry up and get to work:
1. Find out what the building is for.
The way the build is put together is meant to be as clean as possible. This is because things that can happen that are out of the creator’s control can make the widget need to be changed.
Router for Pop/Push
- The screen size has shrunk, mainly because the keyboard layout has changed.
- To make its children again, the parent widget
- Inheritable widgets are those whose behavior changes when their environment changes (Class of (context) pattern).
2. Thinking about what Flutter says about limits
The three rules of Flutter layout that every Flutter app developer should remember are: constraints down, sizes up, and location set by the parent. So let’s get some answers about that, too:
A widget has the same limits as its parent, but it also has its own. For example, a constraint is a set of four doubles: a minimum and maximum width and a minimum and maximum height.
The next step is for the widget to go through all its children. Then, the device tells each of its children its limits, which can be different for each child, and asks them what size they want.
After that, the widget lines up its children along two axes (x and y). The widget then tells its host what size it is (within the original constraints, of course).
In Flutter, all widgets arrange themselves automatically based on the size of their parent or box. There are, however, some limits to this.
Think about the situation where you need to set the size of a child widget inside a parent widget. The size of the device itself can’t change. So the gadget must have the right size for its parent.
3. By using operators, you can reduce the number of lines that need to be run.
· Implement Cascades Operator
Use the Cascades(..) operator if you need to quickly do multiple operations on the same object, one after the other.
· How Widespread Collections Are Done
Spread collections can be used when the same information is also kept in another group. This makes the code easier to read and write.
· In other words, use the Null safe (??) and Null aware (?.) operators.
Take?? At all times. (if it’s not) and? (Null aware) operators can be used in place of null checks in conditional expressions.
· The “as” operator should not be used; instead, the “is” operator should be used.
As a general rule, the cast operator will throw an exception if the cast cannot be made. Use the ‘is’ keyword to stop an exception from being thrown.
4. Only use the stream when you have to.
Streams are mighty, but we have to take on a lot of responsibility if we want to use them well.
Streams can use more memory and CPU if they are not set up well. Even worse, memory leaks can happen if the streams aren’t closed the right way.
Instead of using Streams for reactive UI, you can use Change Notified, which uses less memory. In addition, the Bloc library, which emphasizes making the best use of resources and gives a simple way to make a responsive user interface, can be used to access more complicated features.
If people stop using a stream, it can be considered clean. In this case, deleting the variable is not enough to make sure it will never be called again. There was still the chance that something could be done in the background.
To ensure that the GC can free up resources, you must first run Sink. close() to make the related Stream Controller quit.
5. Create a test set that looks at the most critical parts.
Even though manual testing will always be needed, a set of automated tests can significantly cut the time and effort spent on testing. Because Flutter focuses on working on many different platforms, testing each feature after a change would take a lot of time and effort.
We can’t argue that 100% code coverage for testing is the best, but in reality, this may not always be possible because of time and money. You still need to test how the app works at its core.
Integration tests are complex and take a lot of time, but unit and widget tests can be used immediately.
6. Use the raw string.
You can avoid seeing anything but backslashes and dollar signs in a raw string.
7. Instead of using absolute imports, you might want to use relative imports.
When relative and absolute imports are used together, the same class can be imported in two ways, leading to ambiguity. For example, if you used a relative path inside lib/, this wouldn’t happen.
8. Changing the Container in Flutter to a SizedBox
The Container is a useful widget in Flutter that you’ll use frequently. The non-const function Object() [native code] Container() grows to meet the needs of its parent.
On the other hand, the const SizedBox function Object() [native code] creates a box with a size already set. By setting the width and height parameters to null, you can tell the box that it can be any size it wants.
So, SizedBox should be used instead of a container to create the placeholder.
9. Instead of printing, you should use a log.
You can use either print() or debugPrint to send something to the console (). If print() makes too much output at once, Android may take out some of the log lines.
If you don’t want to deal with this again, use debugPrint (). If your log files contain too much information, you can use dart: developer log (). This way, more information, and details can be added to the logging output.
10. Don’t manually set any variables to “null.”
You don’t need to add null to a Dart variable because the variable is already set to null when it has no value.
This article discussed some of the best ways to build apps with Flutter. This should make the life of any Flutter developer a little bit easier.
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