Isaias Awate

Isaias Awate

1592549700

A Simple Flutter Android App which displays Sensor Data

sensorz

A Simple Flutter Android App, which displays Android Sensor Data.

Introduction ::

  • For implementation of UI, this app uses Flutter Framework.
  • Code base is written mainly using Dart and Kotlin, these two languages.
  • For accessing platform features, such as Sensors, Kotlin Language is used.
  • UI level coding is done using Dart Language.
  • For receiving continuous sensor data feed from platform level, EventChannel is used.
  • This Android App is tested to be properly working on Android Pie (9.0).
  • This app uses Android Sensors Feature ( android.hardware.sensor ).
  • To install apk using adb, try running following command in your computer’s console, after downloading apk. Make sure you have adb installed and PATH variable is properly set.
  >>> adb install sensorz.apk

  • For more info on adb, head to this link.

Download ::

  • You could easily download the apk file here.

App Overview ::

Overview 1 Overview 3 Overview 3
screenshot1 screenshot2 screenshot3

Implementation Info ::

Lets first talk about Dart portion of the app …

UI using Dart :

  • In main.dart, I created one Stateless Widget, SensorMain under which, initialRoute was SensorMainHome, which is a Stateful Widget.

  • As I’m using one Stateful Widget, I need to define a class which will be holding the current state of the app.

  • _SensorMainState, holds current state of app.

  • Overriding build method is required in _SensorMainState. So I used a Scaffold Widget, which is a very basic material based widget.

  • Well let me tell you one thing, in flutter, almost every UI component is a Widget.

  • For displaying sensor info and their live data feed, I’m using LisView layout manager.

  • A Card ( material design UI component ), is holding info regarding a certain sensor which is present on that device.

  • For invoking methods which are available in platform level ( Android API ), I used methodChannel.

  • First need to create an instance of method channel with one unique methodChannelName (String), the same name should be used in platform level code too.

  • That instance will help us to invoke methods which are defined in platform level.

  • One eventChannel is also created, which helps us to gain live sensor data updates from platform level.

  • Remember, we need to create both, methodChannel and eventChannel from platform level too, using same channel identifier string.

  • Check code comments, for more info.

Going to platform level implementation of the app …

Platform Level using Kotlin :

  • In MainActivity.kt, I registered methodChannel and eventChannel.

  • When getSensorsList() is invoked from platform level, a list of all sensors present in that device is returned back to UI level calling function.

  • And using the instance of SensorManager which I created at very beginning of app lifecycle, SensorEventListener is registered for all of those sensors.

  • For sending live sensor data feed to UI level, so that I can update UI as soon as data comes in, I wrote on class MySensorListener, which overrides SensorEventListener, and takes instance of EventChannel.EventSink as the only parameter.

  • In onSensorChanged(), I send sensor data back to UI level, where a listening service is already registered.

  • As soon as data comes in, UI level Dart code starts working for extracting that data and updates UI, so that changes gets reflected.

Well this is it.

Hope it was helpful :)

For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

Download Details:

Author: itzmeanjan

GitHub: https://github.com/itzmeanjan/sensorz

#flutter #dart #mobile-apps

What is GEEK

Buddha Community

A Simple Flutter Android App which displays Sensor Data

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

Fredy  Larson

Fredy Larson

1595059664

How long does it take to develop/build an app?

With more of us using smartphones, the popularity of mobile applications has exploded. In the digital era, the number of people looking for products and services online is growing rapidly. Smartphone owners look for mobile applications that give them quick access to companies’ products and services. As a result, mobile apps provide customers with a lot of benefits in just one device.

Likewise, companies use mobile apps to increase customer loyalty and improve their services. Mobile Developers are in high demand as companies use apps not only to create brand awareness but also to gather information. For that reason, mobile apps are used as tools to collect valuable data from customers to help companies improve their offer.

There are many types of mobile applications, each with its own advantages. For example, native apps perform better, while web apps don’t need to be customized for the platform or operating system (OS). Likewise, hybrid apps provide users with comfortable user experience. However, you may be wondering how long it takes to develop an app.

To give you an idea of how long the app development process takes, here’s a short guide.

App Idea & Research

app-idea-research

_Average time spent: two to five weeks _

This is the initial stage and a crucial step in setting the project in the right direction. In this stage, you brainstorm ideas and select the best one. Apart from that, you’ll need to do some research to see if your idea is viable. Remember that coming up with an idea is easy; the hard part is to make it a reality.

All your ideas may seem viable, but you still have to run some tests to keep it as real as possible. For that reason, when Web Developers are building a web app, they analyze the available ideas to see which one is the best match for the targeted audience.

Targeting the right audience is crucial when you are developing an app. It saves time when shaping the app in the right direction as you have a clear set of objectives. Likewise, analyzing how the app affects the market is essential. During the research process, App Developers must gather information about potential competitors and threats. This helps the app owners develop strategies to tackle difficulties that come up after the launch.

The research process can take several weeks, but it determines how successful your app can be. For that reason, you must take your time to know all the weaknesses and strengths of the competitors, possible app strategies, and targeted audience.

The outcomes of this stage are app prototypes and the minimum feasible product.

#android app #frontend #ios app #minimum viable product (mvp) #mobile app development #web development #android app development #app development #app development for ios and android #app development process #ios and android app development #ios app development #stages in app development

Siphiwe  Nair

Siphiwe Nair

1620466520

Your Data Architecture: Simple Best Practices for Your Data Strategy

If you accumulate data on which you base your decision-making as an organization, you should probably think about your data architecture and possible best practices.

If you accumulate data on which you base your decision-making as an organization, you most probably need to think about your data architecture and consider possible best practices. Gaining a competitive edge, remaining customer-centric to the greatest extent possible, and streamlining processes to get on-the-button outcomes can all be traced back to an organization’s capacity to build a future-ready data architecture.

In what follows, we offer a short overview of the overarching capabilities of data architecture. These include user-centricity, elasticity, robustness, and the capacity to ensure the seamless flow of data at all times. Added to these are automation enablement, plus security and data governance considerations. These points from our checklist for what we perceive to be an anticipatory analytics ecosystem.

#big data #data science #big data analytics #data analysis #data architecture #data transformation #data platform #data strategy #cloud data platform #data acquisition

Android App Development Company in Russia

Android App Development Company in Russia

The user base of android apps is so large that developing an app for just one Operating System can help you target a huge audience. The android smartphone covers more the 50% of the market so a business should definitely start targeting Android users first.

Looking to Develop an Android App in Russia?

WebClues Infotech with a presence as well the experience of serving customers across the globe is the right agency for you to start your Android App Development. With a flexible pricing structure per hour as well as a project basis a business is free to choose whatever suits them better.

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Android App Development Company in Egypt

Android App Development Company in Egypt

Did you know android app can be accessed in 46 languages? This fact opens a wide array of opportunities for businesses who wants to target people that speak different languages at different location.

Want to develop an android app in Egypt to serve worldwide audience?

WebClues Infotech has established a good client presence in Africa and so can easily serve you with it Android App Development Services. A highly skilled development team of 120+ members, 950+ projects delivery experience, WebClues Infotech has got it all to serve you with your needs.

Want to know more about our Android App Development Services in Egypt?

Visit: https://www.webcluesinfotech.com/android-app-development/

Share your requirements https://www.webcluesinfotech.com/contact-us/

View Portfolio https://www.webcluesinfotech.com/portfolio/

#android app development company in egypt #android app development company #android app development #android app #android #hire android app developer