Find this file in your flutter application => pubspec.yaml Use local dependency dependencies: flutter: sdk: flutter my_new_package: path: ./my_new_package Note: The ./my_new_package above means that the my_new_package directory containing the pubspec.yaml for the package is a sub-directory of the app. If you have the package as a directory at the same level as the app, … Read more
decodeImageFromList is just a convenience wrapper around instantiateImageCodec which decodes one of a handful of supported image formats (JPEG, PNG, GIF, Animated GIF, WebP, Animated WebP, BMP, and WBMP). Somewhat surprisingly, there isn’t yet a way to pass a raw bitmap. However, the BMP file format is basically a simple header tacked on the front … Read more
This feature in Dart is called “initializer list”. It allows you to initialize fields of your class, make assertions and call the super constructor. This means that it is not the same as the constructor body. As I said, you can only initialize variables and only access static members. You cannot call any (non-static) methods. … Read more
(posted by Bill Hesse) By wrapping the string literal in a function that takes the context as a parameter, you can have a Function : context -> String that you can pass around instead of a String. If you need to use some String operations, like concat, on these objects, you can implement these operations … Read more
Here’s a way to do it using the Observe package. The example is taken from code comments in that package (and adapted to your example above). Essentially, you annotate fields you want to be observable with the @observable annotation, and then listen for changes (which you trigger with the call to Observable.dirtyCheck(); First, add the … Read more
The web server’s Content-Type header is Content-Type: text/html. Note that isn’t including a charset suffix. It should be saying Content-Type: text/html; charset=utf-8. The package:http client looks for this charset when asked to decode to characters. If it’s missing it defaults to LATIN1 (not utf-8). As you’ve seen, setting the headers on the Request doesn’t help, … Read more
You’re looking for “identical“, which will check if 2 instances are the same. identical(this, other); A more detailed example? class Person { String ssn; String name; Person(this.ssn, this.name); // Define that two persons are equal if their SSNs are equal bool operator ==(Person other) { return (other.ssn == ssn); } } main() { var bob … Read more
Formatters In the services library you will find the TextInputFormatter abstract class (this means that you have to import package:flutter/services.dart). It already has implementations, which are FilteringTextInputFormatter (formerly BlacklistingTextInputFormatter and WhitelistingTextInputFormatter) and LengthLimitingTextInputFormatter. If you want to implement your own formatter, you can do so by extending TextInputFormatter itself and implementing formatEditUpdate in there. I … Read more
There is a Medium blogpost that explains how to do this. However we thought it was way too complicated to set up so it just happens we created a plugin that aids you with this. //Provide a top level function or static function. //This function will be called by Android and will return the value … Read more