Adam Daniels

Adam Daniels

1561006311

Managing Packages In Flutter

If you are developing in Flutter and have not run into the following problem, pay attention, because it will happen to you (sooner or later). You are browsing the Flutter packages website, looking for one that will cater to your needs. Once you find one, you inspect its README.md page and you see the following:

What?

For those of you that are unaware, AndroidX is the new support library that Google has been pushing for some time now to replace the older support libraries that are found inside Android Studio. What does this have to do with me, you say.

Well, in short, everything.

I Just Wanted To Develop In Flutter

Getting your head around the whole support libraries issue can seem irrelevant, but it is something you need to understand. This is because, whatever your application is doing, the code you are writing relies on the support libraries. Support libraries are there to help you:

  • Support multiple API versions by providing backwards compatibility
  • Include libraries that do not come in the standard framework API so you can develop more features
  • Debug and proof your application (I.E. Multidex support)

As I stated earlier, since the release of Android 9 (API level 28), the newer version of the support libraries is called AndroidX. You can still use the older support libraries, but as stated on their website, all new development will happen in AndroidX libraries. So, if you are developing a new application, you might as well already use the new support libraries. And if you already have an application, you seriously need to consider migrating it to use AndroidX.

Photo by Rohan Reddy on Unsplash

Migrating - A New Project

To migrate a new Flutter project, you can use the built in functionality found inside Android Studio. An option inside the top menu, ***Refactor->Migrate to AndroidX ***is supposed to do the hard work for you. But if it were that easy, would I be writing this article?

When you create a new Flutter project, your compileSdkLevel will already be set to 28, but if you try migrating with the method mentioned above, you will get the following popup:

Wait? Didn’t I just set this up?

This is an annoying bug in Android Studio, which will hopefully be fixed. We are left with doing the migration ourselves.

  1. Open the Android part of your Flutter application by switching to the Project view hierarchy and selecting*** Flutter -> Open Android module in Android Studio***

  1. Once opened, Android Studio will ask you to upgrade your gradle version:

Press Update

  1. After it finishes doing so, you will see this warning:
WARNING: API 'variantOutput.getProcessResources()' is obsolete and has been replaced with 'variantOutput.getProcessResourcesProvider()'.
It will be removed at the end of 2019.
For more information, see https://d.android.com/r/tools/task-configuration-avoidance.
To determine what is calling variantOutput.getProcessResources(), use -Pandroid.debug.obsoleteApi=true on the command line to display a stack trace.
Affected Modules: app

Yet again, this is something that needs to be fixed, but we will persevere and move on. The next steps are similar to what is needed to be done to migrate an existing project, so just follow on through to the next section.

Migrating — An Older Project

  1. Open your gradle.properties file and add the following two lines:
android.useAndroidX = true
android.enableJetifier = true

  1. Open your gradle-wrapper.properties file and change the distributionUrl to this:
distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip

  1. Upgrade the gradle version to 3.3.0 in your application level gradle file (disregard if you updated gradle as part of migrating a new project):
dependencies {
classpath 'com.android.tools.build:gradle:3.3.0'
}

  1. Replace all the libraries that relied on the older support libraries with their AndroidX counterparts. For example:
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
//changes to
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

A Hard Truth

Before you can go along, happily skipping, enjoying your triumphant victory over the platform, you need to face a harsh truth:

It’s impossible to fully migrate your app to AndroidX if it’s actively using any plugins that rely on the old support library. If your app depends on plugins that use the old android.support packages, you’ll need to avoid using AndroidX.
Taken directly from Flutter’s documentation, the above sentence completely obliterates your ability to interleave packages that use different versions of the support library. Where will this happen to you? If for instance you want to get a user’s location, you will notice that the permissions package relies on the older support libraries, but the location package uses the newer AndroidX libraries. You can always try to use the version of a package before it moved to AndroidX, but then you might face bugs that have been fixed in later versions or other compatibility issues.

All in all, what you are left with is a sort of game of mix and match, where you have to choose what packages you use wisely.

#flutter #mobile-apps

What is GEEK

Buddha Community

Managing Packages In Flutter

Google's Flutter 1.20 stable announced with new features - Navoki

Flutter Google cross-platform UI framework has released a new version 1.20 stable.

Flutter is Google’s UI framework to make apps for Android, iOS, Web, Windows, Mac, Linux, and Fuchsia OS. Since the last 2 years, the flutter Framework has already achieved popularity among mobile developers to develop Android and iOS apps. In the last few releases, Flutter also added the support of making web applications and desktop applications.

Last month they introduced the support of the Linux desktop app that can be distributed through Canonical Snap Store(Snapcraft), this enables the developers to publish there Linux desktop app for their users and publish on Snap Store.  If you want to learn how to Publish Flutter Desktop app in Snap Store that here is the tutorial.

Flutter 1.20 Framework is built on Google’s made Dart programming language that is a cross-platform language providing native performance, new UI widgets, and other more features for the developer usage.

Here are the few key points of this release:

Performance improvements for Flutter and Dart

In this release, they have got multiple performance improvements in the Dart language itself. A new improvement is to reduce the app size in the release versions of the app. Another performance improvement is to reduce junk in the display of app animation by using the warm-up phase.

sksl_warm-up

If your app is junk information during the first run then the Skia Shading Language shader provides for pre-compilation as part of your app’s build. This can speed it up by more than 2x.

Added a better support of mouse cursors for web and desktop flutter app,. Now many widgets will show cursor on top of them or you can specify the type of supported cursor you want.

Autofill for mobile text fields

Autofill was already supported in native applications now its been added to the Flutter SDK. Now prefilled information stored by your OS can be used for autofill in the application. This feature will be available soon on the flutter web.

flutter_autofill

A new widget for interaction

InteractiveViewer is a new widget design for common interactions in your app like pan, zoom drag and drop for resizing the widget. Informations on this you can check more on this API documentation where you can try this widget on the DartPad. In this release, drag-drop has more features added like you can know precisely where the drop happened and get the position.

Updated Material Slider, RangeSlider, TimePicker, and DatePicker

In this new release, there are many pre-existing widgets that were updated to match the latest material guidelines, these updates include better interaction with Slider and RangeSliderDatePicker with support for date range and time picker with the new style.

flutter_DatePicker

New pubspec.yaml format

Other than these widget updates there is some update within the project also like in pubspec.yaml file format. If you are a flutter plugin publisher then your old pubspec.yaml  is no longer supported to publish a plugin as the older format does not specify for which platform plugin you are making. All existing plugin will continue to work with flutter apps but you should make a plugin update as soon as possible.

Preview of embedded Dart DevTools in Visual Studio Code

Visual Studio code flutter extension got an update in this release. You get a preview of new features where you can analyze that Dev tools in your coding workspace. Enable this feature in your vs code by _dart.previewEmbeddedDevTools_setting. Dart DevTools menu you can choose your favorite page embed on your code workspace.

Network tracking

The updated the Dev tools comes with the network page that enables network profiling. You can track the timings and other information like status and content type of your** network calls** within your app. You can also monitor gRPC traffic.

Generate type-safe platform channels for platform interop

Pigeon is a command-line tool that will generate types of safe platform channels without adding additional dependencies. With this instead of manually matching method strings on platform channel and serializing arguments, you can invoke native class and pass nonprimitive data objects by directly calling the Dartmethod.

There is still a long list of updates in the new version of Flutter 1.2 that we cannot cover in this blog. You can get more details you can visit the official site to know more. Also, you can subscribe to the Navoki newsletter to get updates on these features and upcoming new updates and lessons. In upcoming new versions, we might see more new features and improvements.

You can get more free Flutter tutorials you can follow these courses:

#dart #developers #flutter #app developed #dart devtools in visual studio code #firebase local emulator suite in flutter #flutter autofill #flutter date picker #flutter desktop linux app build and publish on snapcraft store #flutter pigeon #flutter range slider #flutter slider #flutter time picker #flutter tutorial #flutter widget #google flutter #linux #navoki #pubspec format #setup flutter desktop on windows

Terry  Tremblay

Terry Tremblay

1598396940

What is Flutter and why you should learn it?

Flutter is an open-source UI toolkit for mobile developers, so they can use it to build native-looking** Android and iOS** applications from the same code base for both platforms. Flutter is also working to make Flutter apps for Web, PWA (progressive Web-App) and Desktop platform (Windows,macOS,Linux).

flutter-mobile-desktop-web-embedded_min

Flutter was officially released in December 2018. Since then, it has gone a much stronger flutter community.

There has been much increase in flutter developers, flutter packages, youtube tutorials, blogs, flutter examples apps, official and private events, and more. Flutter is now on top software repos based and trending on GitHub.

Flutter meaning?

What is Flutter? this question comes to many new developer’s mind.

humming_bird_dart_flutter

Flutter means flying wings quickly, and lightly but obviously, this doesn’t apply in our SDK.

So Flutter was one of the companies that were acquired by **Google **for around $40 million. That company was based on providing gesture detection and recognition from a standard webcam. But later when the Flutter was going to release in alpha version for developer it’s name was Sky, but since Google already owned Flutter name, so they rename it to Flutter.

Where Flutter is used?

Flutter is used in many startup companies nowadays, and even some MNCs are also adopting Flutter as a mobile development framework. Many top famous companies are using their apps in Flutter. Some of them here are

Dream11

Dream11

NuBank

NuBank

Reflectly app

Reflectly app

Abbey Road Studios

Abbey Road Studios

and many more other apps. Mobile development companies also adopted Flutter as a service for their clients. Even I was one of them who developed flutter apps as a freelancer and later as an IT company for mobile apps.

Flutter as a service

#dart #flutter #uncategorized #flutter framework #flutter jobs #flutter language #flutter meaning #flutter meaning in hindi #google flutter #how does flutter work #what is flutter

Adobe XD plugin for Flutter with CodePen Tutorial

Recently Adobe XD releases a new version of the plugin that you can use to export designs directly into flutter widgets or screens. Yes, you read it right, now you can make and export your favorite design in Adobe XD and export all the design in the widget form or as a full-screen design, this can save you a lot of time required in designing.

What we will do?
I will make a simple design of a dialogue box with a card design with text over it as shown below. After you complete this exercise you can experiment with the UI. You can make your own components or import UI kits available with the Adobe XD.

#developers #flutter #adobe xd design export to flutter #adobe xd flutter code #adobe xd flutter code generator - plugin #adobe xd flutter plugin #adobe xd flutter plugin tutorial #adobe xd plugins #adobe xd to flutter #adobe xd tutorial #codepen for flutter.

Brain  Crist

Brain Crist

1603616400

Flutter Bloc State Management

A flutter bloc state management series that will walk you through from all the basics of streams to advance state management tools like flutter_bloc/bloc package

Let’s start by understanding what we mean by state management and why should we care about it in the first place.

What Exactly Is State management ?

In simple words, state means data or the current information the user can see or manipulate.

For eg: Interface controls such as text fields, OK buttons, radio buttons, etc. To maintain these state of data like weather a button is pressed or not what is the current text in the text field or is a toggle button on or off, These data which user generally see or interacts with or generates on some event is called the state and the term used for maintaining all these information(state) is called state management.

The problem :

State management can become very messy when the application grows, simple tools like setState in flutter can’t be the solution for managing large changes at once and tools like inherited widget can create a lot of boilerplate code.

The Solution :

To overcome the above problem we can simply use tools like flutter_bloc/bloc these packages are created by the community are pretty useful for reducing boilerplate code and can be very easy to implement.

Before going deep into the flutter_bloc package we need to make our basics clear these basics includes :

_:: _streams

:: cubit

:: bloc

Streams :

A stream is a sequence of asynchronous data. Streams are just like water hose which have a sink and a drain, Which we can use to provide and retrieve data from streams. To fully understand the concept of bloc we will first need to understand the core features and basic application of streams in Dart.

As we know the basic definition of streams lets generate our own stream using the yield keyword.

Image for post

Image for post

using yield to generate stream’s

In the above example, we have a function getRandomNumberStream this function is present in “lib\streamGenerators.dart” (It’s better to clone the repo and take a look at the structure of the program) which output streams we have specified that by using *async. **Then we have a Future.delayed() which delays our execution for the first run for 1000 ms and then 500 ms for every other subsequent execution. Then we output(yield) the value.

What** yield **does it basically output the data in the form of a stream, So this function is going to be our go-to for all our need for streams in this first series.

Now let me brief about all the basic functions that are available with streams.

  • .map: .map helps us to map the event that we are getting from the stream by passing them to a function. ex
StreamGenerators.getRandomNumberStream(10).map((event) => "This event --$event-- is mapped");

op:
This event --$0-- is mapped
This event --$1-- is mapped
This event --$2-- is mapped
This event --$3-- is mapped
This event --$4-- is mapped
  • .take: .take will only take the first N values and drain the rest of the values. ex

#bloc #flutter-widget #flutter-state-management #flutter-bloc #flutter

Brain  Crist

Brain Crist

1602147600

Flutter App Development Trends 2020

As the new decade dawns upon us, a slew of technologies has been making a lot of noise to grab the developers’ attention. While native app development is going strong, the trade winds are now blowing towards going cross-platform.

Adobe PhoneGap, React Native, Xamarin and Ionic are all leaving no stone unturned to be the undefeated champion of cross-platform development. Still, Google’s Flutter is all set to take them all on at once.

There are a tonne of resources available online to learn about Flutter, and you can start with this step by step flutter guide.

With reduced code development time, increased time-to-market speed, near-native performance, and a bevy of advantages under its hood, Flutter is set to dominate the market this decade.

Before we take a look at trends making the Flutter race ahead in 2020, let us do a quick recap of what Flutter is, for those who have been living under a rock.

#flutter #flutter-for-mobile-app #flutter-app-development #mobile-app-development #flutter-trends #software-development #advantages-of-flutter-mobile #pros-and-cons-of-flutter