{"id":13872,"date":"2023-10-29T10:19:00","date_gmt":"2023-10-29T10:19:00","guid":{"rendered":"https:\/\/www.mindinventory.com\/blog\/flutter-development-best-practices\/"},"modified":"2025-09-11T12:33:46","modified_gmt":"2025-09-11T12:33:46","slug":"flutter-development-best-practices","status":"publish","type":"post","link":"https:\/\/www.mindinventory.com\/blog\/flutter-development-best-practices\/","title":{"rendered":"12 Best Practices to Simplify Flutter App Development in 2025"},"content":{"rendered":"\n<p>Flutter is one of the most popular cross-platform mobile frameworks by Google. Developers, beyond those providing <a href=\"https:\/\/www.mindinventory.com\/flutter-app-development\/\">Flutter development services<\/a>, are increasingly adopting the Flutter framework for a wide range of mobile app projects worldwide. As a result, Flutter frequently releases updated versions, with Flutter 3.5 being the latest. Today we are going to talk about what are the best practices for Flutter app development, referring to this blog will simplify your process of developing an app with Flutter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-flutter-best-practice-for-app-development\"><span class=\"ez-toc-section\" id=\"Flutter_Best_Practice_for_App_Development\"><\/span>Flutter Best Practice for App Development<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here, you will learn the best practices for Flutter developers to improve code quality, readability, maintainability, and productivity. Let\u2019s get cracking:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-make-the-build-function-pure\">1.&nbsp; Make the build function pure<\/h3>\n\n\n\n<p>The <em>build<\/em> method is developed in such a way that it has to be <em>pure\/without any unwanted stuff<\/em>. This is because there are certain external factors that can trigger a new widget build, below are some examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Route pop\/push<\/li>\n\n\n\n<li>Screen resize, usually because of keyboard appearance or orientation change<\/li>\n\n\n\n<li>The parent widget recreated its child<\/li>\n\n\n\n<li>An Inherited Widget the widget depends on (Class. of(context) pattern) change<\/li>\n<\/ul>\n\n\n\n<p>Avoid:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@override\nWidget build(BuildContext context) {\n  return FutureBuilder(\n    future: httpCall(),\n    builder: (context, snapshot) {\n      \/\/ create some layout here\n    },\n  );\n}<\/code><\/pre>\n\n\n\n<p>Should be like this:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Example extends StatefulWidget {\n  @override\n  _ExampleState createState() =&gt; _ExampleState();\n}\nclass _ExampleState extends State&lt;Example&gt; {\n  Future&lt;int&gt; future;\n\n  @override\n  void initState() {\n    future = repository.httpCall();\n    super.initState();\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    return FutureBuilder(\n      future: future,\n      builder: (context, snapshot) {\n        \/\/ create some layout here\n      },\n    );\n  }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-understanding-the-concept-of-constraints-in-flutter\">2. Understanding the concept of constraints in Flutter<\/h3>\n\n\n\n<p>There is a thumb rule of a Flutter layout that every Flutter app developer needs to know: constraints go down, sizes go up, and the parent sets the position. Let\u2019s understand more about the same:<\/p>\n\n\n\n<p>A widget has its own constraints from its parent. A constraint is known to be a set of four doubles: a minimum and maximum width, and a minimum and maximum height.<\/p>\n\n\n\n<p>Next up, the widget goes through its own list of children. One after another, the widget commands its children what their constraints are (which can be different for each child), and then asks each child what size it wants to be.<\/p>\n\n\n\n<p>Next, the widget positions its children (horizontally in the x axis, and vertically in the y axis) one after the other. And then, the widget notifies its parent about its own size (within the original constraints, of course).<\/p>\n\n\n\n<p>In Flutter, all widgets give themselves on the basis of their parent or their box constraints. But this has some limitations attached.<\/p>\n\n\n\n<p>For instance, if you have got a child widget inside a parent widget and you would want to decide on its size. The widget cannot have any size on its own. The size of the widget must be within the constraints set by its parent.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-smart-use-of-operators-to-reduce-the-number-of-lines-for-execution\">3. Smart use of operators to reduce the number of lines for execution<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Use Cascades Operator<\/strong><\/li>\n<\/ul>\n\n\n\n<p>If we are supposed to perform a sequence of operations on the same object then we should opt for Cascades(..) operator.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nvar path = Path()\n..lineTo(0, size.height)\n..lineTo(size.width, size.height)\n..lineTo(size.width, 0)\n..close();  \n\n\/\/Do not\nvar path = Path();\npath.lineTo(0, size.height);\npath.lineTo(size.width, size.height);\npath.lineTo(size.width, 0);\npath.close();<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Use spread collections<\/strong><\/li>\n<\/ul>\n\n\n\n<p>You can use spread collections when existing items are already stored in another collection, spread collection syntax leads to simpler and easier code.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nvar y = &#91;4,5,6];\nvar x = &#91;1,2,...y];\n\n\/\/Do not\nvar y = &#91;4,5,6];\nvar x = &#91;1,2];\nx.addAll(y);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Use Null safe (??) and Null aware (?.) operators<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Always go for ?? (if null) and ?. (null aware) operators instead of null checks in conditional expressions.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do \t\nv = a ?? b; \n\/\/Do not\nv = a == null ? b : a;\n\n\/\/Do\nv = a?.b; \n\/\/Do not\nv = a == null ? null : a.b;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A<\/strong><strong>void using \u201cas\u201d operator instead of that, use \u201cis\u201d operator<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Generally, the <code>as<\/code> cast operator throws an exception if the cast is not possible. To prevent an exception being thrown, one can use `<code>is<\/code>`.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nif (item is Animal)\nitem.name = 'Lion';\n\n\/\/Do not\n(item as Animal).name = 'Lion';<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-use-streams-only-when-needed\">4. Use streams only when needed<\/h3>\n\n\n\n<p>While Streams are pretty powerful, if we are using them, it lands a big responsibility on our shoulders in order to make effective use of this resource.<\/p>\n\n\n\n<p>Using Streams with inferior implementation can lead to more memory and CPU usage. Not just that, if you forget to close the streams, you will lead to memory leaks.<\/p>\n\n\n\n<p>So, in such cases, rather than using Streams, you can use something more that consumes lesser memory such as ChangeNotifier for reactive UI. For more advanced functionalities, we can use Bloc library which puts more effort on using the resources in an efficient manner and offer a simple interface to build the reactive UI.<\/p>\n\n\n\n<p>Streams will effectively be cleaned as long as they aren&#8217;t used anymore. Here the thing is, if you simply remove the variable, that is not sufficient to make sure it&#8217;s not used. It could still run in the background.<\/p>\n\n\n\n<p>You need to call Sink.close() so that it stops the associated StreamController, to make sure resources can later be freed by the GC.<\/p>\n\n\n\n<p>To do that, you have to use StatefulWidget.dispose of method:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>abstract class MyBloc {\n  Sink foo;\n  Sink bar;\n}\n\nclass MyWiget extends StatefulWidget {\n  @override\n  _MyWigetState createState() =&gt; _MyWigetState();\n}\n\nclass _MyWigetState extends State&lt;MyWiget&gt; {\n  MyBloc bloc;\n\n  @override\n  void dispose() {\n    bloc.bar.close();\n    bloc.foo.close();\n    super.dispose();\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    \/\/ ...\n  }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-write-tests-for-critical-functionality\">5.&nbsp; Write tests for critical functionality<\/h3>\n\n\n\n<p>The contingencies of relying on manual testing will always be there, having an automated set of tests can help you save a notable amount of time and effort. As Flutter mainly targets multiple platforms, testing each and every functionality after every change would be time-consuming and call for a lot of repeated effort.<\/p>\n\n\n\n<p>Let&#8217;s face the facts, having 100% code coverage for testing will always be the best option, however, it might not always be possible on the basis of available time and budget. Nonetheless, it&#8217;s still essential to have at least tests to cover the critical functionality of the app.<\/p>\n\n\n\n<p>Unit and widget tests are the topmost options to go with from the very beginning and it\u2019s not at all tedious as compared to integration tests.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-6-use-raw-string\">6. Use raw string<\/h3>\n\n\n\n<p>A raw string can be used to not come across escaping only backslashes and dollars.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nvar s = r'This is demo string  and $';\n\n\/\/Do not\nvar s = 'This is demo string \\ and $';<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-7-use-relative-imports-instead-of-absolute-imports\">7. Use relative imports instead of absolute imports<\/h3>\n\n\n\n<p>When using relative and absolute imports together then It is possible to create confusion when the same class gets imported from two different ways. To avoid this case we should use a relative path in the lib\/ folder.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nimport '..\/..\/themes\/style.dart';\n\n\/\/Do not\nimport 'package:myapp\/themes\/style.dart';<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-8-using-sizedbox-instead-of-container-in-flutter\">8. Using SizedBox instead of Container in Flutter<\/h3>\n\n\n\n<p>There are multiple use cases where you will require to use a placeholder. Here is the ideal example below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><meta charset=\"utf-8\">return _isNotLoaded ? Container() : YourAppropriateWidget();<\/code><\/pre>\n\n\n\n<p>The Container is a great widget that you will be using extensively in Flutter. Container() brodens up to fit the constraints given by the parent and is not a const constructor.<\/p>\n\n\n\n<p>On the contrary, the SizedBox is a const constructor and builds a fixed-size box. The width and height parameters can be null to specify that the size of the box should not be constrained in the corresponding dimension.<\/p>\n\n\n\n<p>Thus, when we have to implement the placeholder, SizedBox should be used rather than using a container.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>return _isNotLoaded ? SizedBox() : YourAppropriateWidget();<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-9-use-log-instead-print\">9. Use log instead print<\/h3>\n\n\n\n<p>print() and debugPrint() both are always applied for logging in to the console. If you are using print() and you get output which is too much at once, then Android discards some log lines at times.<\/p>\n\n\n\n<p>To not face this again, use debugPrint(). If your log data has more than enough data then use dart: developer log(). This enables you to add a bit more granularity and information in the logging output.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nlog('data: $data');\n\n\/\/Do not\nprint('data: $data');<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use ternary operator for single-line cases.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>String alert = isReturningCustomer ? 'Welcome back to our site!' : 'Welcome, please sign up.';<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use if condition instead of ternary operator for the case like below.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>Widget getText(BuildContext context) {\n    return Row(\n        children:\n        &#91;\n            Text(\"Hello\"),\n            if (Platform.isAndroid) Text(\"Android\") (here if you use ternary then that is wrong)\n        ]\n    );\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Always try to use const widgets. The widget will not change when setState call we should define it as constant. It will impede the widget from being rebuilt so it revamps performance.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nconst SizedBox(height: Dimens.space_normal)\n\n\/\/Do not\nSizedBox(height: Dimens.space_normal)<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-10-don-t-explicitly-initialize-variables-null\">10. Don\u2019t explicitly initialize variables null<\/h3>\n\n\n\n<p>In Dart, the variable is intuitively initialized to null when its value is not specified, so adding null is redundant and unrequired.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nint _item;\n\n\/\/Do not\nint _item = null;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Always highlight the type of member when its value type is known. Do not use var when it is not required. As var is a dynamic type takes more space and time to resolve.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nint item = 10;\nfinal Car bar = Car();\nString name = 'john';\nconst int timeOut = 20;\n\n\/\/Do not\nvar item = 10;\nfinal car = Car();\nconst timeOut = 2000;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-11-use-the-const-keyword-whenever-possible\">11. Use the const keyword whenever possible<\/h3>\n\n\n\n<p>Using a const constructor for widgets can lessen down the work required for garbage collectors. This will probably seem like a small performance in the beginning but it actually adds up and makes a difference when the app is big enough or there is a view that gets often rebuilt.<\/p>\n\n\n\n<p>Const declarations are also more hot-reload friendly. Moreover, we should ignore the unnecessary const keyword. Have a look at the following code:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const Container(\n  width: 100,\n  child: const Text('Hello World')\n);<\/code><\/pre>\n\n\n\n<p>We don&#8217;t require to use const for the Text widget since const is already applied to the parent widget.<\/p>\n\n\n\n<p>Dart offers following Linter rules for const:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>prefer_const_constructors\nprefer_const_declarations\nprefer_const_literals_to_create_immutables\nUnnecessary_const<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-12-some-cosmetic-points-to-keep-in-mind\">12. Some cosmetic points to keep in mind<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Never fail to wrap your root widgets in a safe area.<\/li>\n\n\n\n<li>You can declare multiple variables with shortcut- (int mark =10, total = 20, amount = 30;)<\/li>\n\n\n\n<li>Ensure to use final\/const class variables whenever there is a possibility.<\/li>\n\n\n\n<li>Try not to use unrequired commented codes.<\/li>\n\n\n\n<li>Create private variables and methods whenever possible.<\/li>\n\n\n\n<li>Build different classes for colors, text styles, dimensions, constant strings, duration, and so on.<\/li>\n\n\n\n<li>Develop API constants for API keys.<\/li>\n\n\n\n<li>Try not to use of await keywords inside the bloc<\/li>\n\n\n\n<li>Try not to use global variables and functions. They have to be tied up with the class.<\/li>\n\n\n\n<li>Check dart analysis and follow its recommendations<\/li>\n\n\n\n<li>Check underline which suggests Typo or optimization tips<\/li>\n\n\n\n<li>Use _ (underscore) if the value is not used inside the block of code.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nsomeFuture.then((_) =&gt; someFunc());\n\n\/\/Do not\nsomeFuture.then((DATA_TYPE VARIABLE) =&gt; someFunc());<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Magical numbers always have proper naming for human readability.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/Do\nfinal _frameIconSize = 13.0;\n SvgPicture.asset(\n Images.frameWhite,\n height: _frameIconSize,\n width: _frameIconSize,\n );\n\n\/\/Do not\nSvgPicture.asset(\nImages.frameWhite,\nheight: 13.0,\nwidth: 13.0,\n);<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-alright-here-we-are\"><span class=\"ez-toc-section\" id=\"Alright_here_we_are\"><\/span>Alright, here we are<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>So, this was about the best practices for Flutter development that relatively ease down the work of every Flutter developer.<\/p>\n\n\n\n<p>If you\u2019re having difficulty developing a Flutter app or want to <a href=\"https:\/\/www.mindinventory.com\/hire-flutter-app-developers\/\">hire dedicated Flutter developers<\/a> for your project, MindInventory can be your ideal destination for the same. We have a proficient team of Flutter developers to assist you with your project.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Flutter is one of the most popular cross-platform mobile frameworks by Google. Developers, beyond those providing Flutter development services, are increasingly adopting the Flutter framework for a wide range of mobile app projects worldwide. As a result, Flutter frequently releases updated versions, with Flutter 3.5 being the latest. Today we are going to talk about [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":15301,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1434],"tags":[2571,2287,2572],"industries":[2768],"class_list":["post-13872","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mobile","tag-best-practices-for-flutter-development","tag-flutter-app-development","tag-flutter-best-practices","industries-general"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.1.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>12 Flutter Best Practices to Follow in 2025<\/title>\n<meta name=\"description\" content=\"Unlock the potential of Flutter app development with our comprehensive guide on the Best Flutter Best Practices to Follow in 2025.\" \/>\n<meta name=\"robots\" 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