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Flutter - Access global non-changing variables

Luciano Jung
New Posts every week about practical experiences and learnings in Flutter.
Updated on 1 min read

In Flutter, you often have non-changing values that are used across the app (for example the app name, version, etc.) Wouldn't it be nice for you to have globally managed access for these?
Of course and I'll show you how to do it here:

The basic idea

For the simple administration of global values it is sufficient to have a static access to a class, which provides the needed values. For this it is recommended to use the Singleton pattern in this class.

The solution

To solve this problem we generate a class (I call it Globalvariables for this example). In this we implement the singleton pattern as shown below.

class GlobalVariables{

  static final GlobalVariables _instance = GlobalVariables._internal();

  factory GlobalVariables() => _instance;

  GlobalVariables._internal();

  [...]

}
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Then we create the getter functions without declaring variables.

class GlobalVariables{

  [...]

  String get name => 'My Flutter App';
  String get version => '1.0.0';
  int get versionCode => 100;
}
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We can now access these Variables with the following line of code:

GlobalVariables().name // => My Flutter App
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Comments

Instead of using the Singleton pattern, it is of course also possible, but less convenient, to define static variables or functions with the addition 'static':

static String get name => 'My Flutter App';
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