Flutter.dev how to use, tutorial

Write your first Flutter app on the web - Flutter

Details: It’s okay if the Android toolchain, Android Studio, and the Xcode tools are not installed, since the app is intended for the web only. If you later want this app to work on mobile, you will need to do additional installation and setup.

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› Url: https://flutter.dev/docs/get-started/codelab-web Go Now

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Using packages - Flutter

Details: For additional details, see the package versioning guide.. Updating package dependencies. When running flutter pub get (Packages get in IntelliJ or Android Studio) for the first time after adding a package, Flutter saves the concrete package version found in the pubspec.lock lockfile.This ensures that you get the same version again if you, or another developer on your team, run flutter pub get.

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› Url: https://flutter.dev/docs/development/packages-and-plugins/using-packages Go Now

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Test drive - Flutter

Details: Try hot reload. Flutter offers a fast development cycle with Stateful Hot Reload, the ability to reload the code of a live running app without restarting or losing app state.Make a change to app source, tell your IDE or command-line tool that you want to hot reload, and see the change in your simulator, emulator, or device.

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› Url: https://flutter.dev/docs/get-started/test-drive?tab=terminal Go Now

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Using the Flutter inspector - Flutter

Details: Note: The inspector works with all Flutter applications. What is it? The Flutter widget inspector is a powerful tool for visualizing and exploring Flutter widget trees. The Flutter framework uses widgets as the core building block for anything from controls (such as text, buttons, and toggles), to layout (such as centering, padding, rows, and columns).

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› Url: https://flutter.dev/docs/development/tools/devtools/inspector Go Now

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Basic Flutter layout concepts - Flutter

Details: Axis size and alignment. So far, the BlueBox widgets have been squished together (either to the left or at the top of the UI Output). You can change how the BlueBox widgets are spaced out using the axis size and alignment properties.. mainAxisSize property. Row and Column occupy different main axes. A Row’s main axis is horizontal, and a Column’s main axis is vertical.

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› Url: https://flutter.dev/docs/codelabs/layout-basics Go Now

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Build and release a Linux app to the Snap Store - Flutter

Details: During a typical development cycle, you test an app using flutter run at the command line, or by using the Run and Debug options in your IDE. By default, Flutter builds a debug version of your app.. When you’re ready to prepare a release version of your app, for example to publish to the Snap Store, this page can help.. Warning: Work in progress! This page covers desktop support for Linux

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› Url: https://flutter.dev/docs/deployment/linux Go Now

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Integration testing - Flutter

Details: This page describes how to use the integration_test package to run integration tests. Tests written using this package have the following properties: Compatibility with the flutter drive command, for running tests on a physical device or emulator.; The ability to be run on Firebase Test Lab, enabling automated testing on a variety of devices.

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› Url: https://flutter.dev/docs/testing/integration-tests Go Now

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Flutter - Beautiful native apps in record time

Details: Flutter SDK is Google's UI toolkit for crafting beautiful, natively compiled applications for mobile, web, and desktop from a single codebase.

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› Url: https://flutter.dev/?gclsrc=aw.ds Go Now

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Using slivers to achieve fancy scrolling - Flutter

Details: A sliver is a portion of a scrollable area that you can define to behave in a special way. You can use slivers to achieve custom scrolling effects, such as elastic scrolling.

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› Url: https://flutter.dev/docs/development/ui/advanced/slivers Go Now

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Expanded class - widgets library - Dart API

Details: To create a local project with this code sample, run: flutter create --sample=widgets.Expanded.1 mysample

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› Url: https://api.flutter.dev/flutter/widgets/Expanded-class.html Go Now

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Creating flavors for Flutter - Flutter

Details: Creating flavors for Flutter. Do you need to set up product flavors for different development environments or release types? The community has written some articles and packages you might find useful.

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› Url: https://flutter.dev/docs/deployment/flavors Go Now

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Creating responsive apps - Flutter

Details: A responsive app lays out its UI according to the size and shape of the screen or window. This is especially necessary when the same app can run on a variety of devices, from a watch, phone, tablet, to a laptop or desktop computer.

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› Url: https://flutter.dev/docs/development/ui/layout/responsive Go Now

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Web Installation | FlutterFire - FlutterFire | FlutterFire

Details: For more information on setting Firebase up for the web, view the official documentation.. We are actively investigating ways to initialize Firebase without directly using the CDN and will update the documentation once this becomes available.

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› Url: https://firebase.flutter.dev/docs/installation/web/ Go Now

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Forms - Flutter

Details: [email protected] terms; brand usage; security; privacy; español; 社区中文资源; 한국어; We stand in solidarity with the Black community. Black Lives Matter.

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› Url: https://flutter.dev/docs/cookbook/forms Go Now

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MediaQuery class - widgets library - Dart API

Details: Establishes a subtree in which media queries resolve to the given data. For example, to learn the size of the current media (e.g., the window containing your app), you can read the MediaQueryData.size property from the MediaQueryData returned by MediaQuery.of: MediaQuery.of(context).size.. Querying the current media using MediaQuery.of will cause your widget to rebuild automatically whenever

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› Url: https://api.flutter.dev/flutter/widgets/MediaQuery-class.html Go Now

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showDialog function - material library - Dart API

Details: This sample demonstrates how to create a restorable Material dialog. This is accomplished by enabling state restoration by specifying MaterialApp.restorationScopeId and using Navigator.restorablePush to push DialogRoute when the button is tapped. To test state restoration on Android:

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› Url: https://api.flutter.dev/flutter/material/showDialog.html Go Now

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ElevatedButton class - material library - Dart API

Details: A Material Design "elevated button". Use elevated buttons to add dimension to otherwise mostly flat layouts, e.g. in long busy lists of content, or in wide spaces.

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› Url: https://api.flutter.dev/flutter/material/ElevatedButton-class.html Go Now

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Pass arguments to a named route - Flutter

Details: The Navigator provides the ability to navigate to a named route from any part of an app using a common identifier. In some cases, you might also need to pass arguments to a named route. For example, you might wish to navigate to the /user route and pass information about the user to that route.. You can accomplish this task using the arguments parameter of the Navigator.pushNamed() method.

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› Url: https://flutter.dev/docs/cookbook/navigation/navigate-with-arguments Go Now

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FloatingActionButton class - material library - Dart API

Details: A material design floating action button. A floating action button is a circular icon button that hovers over content to promote a primary action in the application.

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› Url: https://api.flutter.dev/flutter/material/FloatingActionButton-class.html Go Now

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Timer class - dart:async library - Dart API

Details: API docs for the Timer class from the dart:async library, for the Dart programming language.

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› Url: https://api.flutter.dev/flutter/dart-async/Timer-class.html Go Now

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FutureBuilder class - widgets library - Dart API

Details: Timing. Widget rebuilding is scheduled by the completion of the future, using State.setState, but is otherwise decoupled from the timing of the future.The builder callback is called at the discretion of the Flutter pipeline, and will thus receive a timing-dependent sub-sequence of the snapshots that represent the interaction with the future.. A side-effect of this is that providing a new but

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› Url: https://api.flutter.dev/flutter/widgets/FutureBuilder-class.html Go Now

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Icons class - material library - Dart API

Details: Identifiers for the supported material design icons. Use with the Icon class to show specific icons.. Icons are identified by their name as listed below. To use this class, make sure you set uses-material-design: true in your project's pubspec.yaml file in the flutter section. This ensures that the MaterialIcons font is included in your application.

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› Url: https://api.flutter.dev/flutter/material/Icons-class.html Go Now

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Duration class - dart:core library - Dart API

Details: A span of time, such as 27 days, 4 hours, 12 minutes, and 3 seconds. A Duration represents a difference from one point in time to another. The duration may be "negative" if the difference is from a later time to an earlier.

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› Url: https://api.flutter.dev/flutter/dart-core/Duration-class.html Go Now

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StatefulWidget class - widgets library - Dart API

Details: StatefulWidget instances themselves are immutable and store their mutable state either in separate State objects that are created by the createState method, or in objects to which that State subscribes, for example Stream or ChangeNotifier objects, to which references are stored in final fields on the StatefulWidget itself.. The framework calls createState whenever it inflates a StatefulWidget

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› Url: https://api.flutter.dev/flutter/widgets/StatefulWidget-class.html Go Now

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Scaffold class - material library - Dart API

Details: Implements the basic material design visual layout structure. This class provides APIs for showing drawers and bottom sheets. To display a persistent bottom sheet, obtain the ScaffoldState for the current BuildContext via Scaffold.of and use the ScaffoldState.showBottomSheet function.

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› Url: https://api.flutter.dev/flutter/material/Scaffold-class.html Go Now

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Take a picture using the camera - Flutter

Details: 5. Take a picture with the CameraController. You can use the CameraController to take pictures using the takePicture() method, which returns an XFile, a cross-platform, simplified File abstraction. On both Android and IOS, the new image is stored in their respective cache directories, and the path to that location is returned in the XFile.. In this example, create a FloatingActionButton that

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› Url: https://flutter.dev/docs/cookbook/plugins/picture-using-camera Go Now

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setState method - State class - widgets library - Dart API

Details: Notify the framework that the internal state of this object has changed. Whenever you change the internal state of a State object, make the change in a function that you pass to setState:. setState(() { _myState = newValue; });

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› Url: https://api.flutter.dev/flutter/widgets/State/setState.html Go Now

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leading property - AppBar class - material library - Dart API

Details: The Builder is used in this example to ensure that the context refers to that part of the subtree. That way this code snippet can be used even inside the very code that is creating the Scaffold (in which case, without the Builder, the context wouldn't be able to see the Scaffold, since it would refer to an ancestor of that widget).. See also: Scaffold.appBar, in which an AppBar is usually placed.

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› Url: https://api.flutter.dev/flutter/material/AppBar/leading.html Go Now

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FlatButton class - material library - Dart API

Details: API docs for the FlatButton class from the material library, for the Dart programming language.

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› Url: https://api.flutter.dev/flutter/material/FlatButton-class.html Go Now

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Retrieve the value of a text field - Flutter

Details: 3. Display the current value of the text field. After supplying the TextEditingController to the text field, begin reading values. Use the text() method provided by the TextEditingController to retrieve the String that the user has entered into the text field.. The following code displays an alert dialog with the current value of the text field when the user taps a floating action button.

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› Url: https://flutter.dev/docs/cookbook/forms/retrieve-input Go Now

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DropdownButton class - material library - Dart API

Details: A material design button for selecting from a list of items. A dropdown button lets the user select from a number of items. The button shows the currently selected item as well as an arrow that opens a menu for selecting another item.

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› Url: https://api.flutter.dev/flutter/material/DropdownButton-class.html Go Now

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State class - widgets library - Dart API

Details: The logic and internal state for a StatefulWidget.. State is information that (1) can be read synchronously when the widget is built and (2) might change during the lifetime of the widget.

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› Url: https://api.flutter.dev/flutter/widgets/State-class.html Go Now

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BottomNavigationBar class - material library - Dart API

Details: This example shows a BottomNavigationBar as it is used within a Scaffold widget. The BottomNavigationBar has three BottomNavigationBarItem widgets, which means it defaults to BottomNavigationBarType.fixed, and the currentIndex is set to index 0. The selected item is amber. The _onItemTapped function changes the selected item's index and displays a corresponding message in the center of the

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› Url: https://api.flutter.dev/flutter/material/BottomNavigationBar-class.html Go Now

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Display images from the internet - Flutter

Details: How to display images from the internet. Placeholders and caching. The default Image.network constructor doesn’t handle more advanced functionality, such as fading images in after loading, or caching images to the device after they’re downloaded. To accomplish these tasks, see the following recipes:

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› Url: https://flutter.dev/docs/cookbook/images/network-image Go Now

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pushNamed method - Navigator class - widgets library

Details: Push a named route onto the navigator that most tightly encloses the given context. The route name will be passed to the Navigator.onGenerateRoute callback. The returned route will be pushed into the navigator.

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› Url: https://api.flutter.dev/flutter/widgets/Navigator/pushNamed.html Go Now

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TextEditingController class - widgets library - Dart API

Details: A controller for an editable text field. Whenever the user modifies a text field with an associated TextEditingController, the text field updates value and the controller notifies its listeners. Listeners can then read the text and selection properties to learn what the user has typed or how the selection has been updated.. Similarly, if you modify the text or selection properties, the text

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› Url: https://api.flutter.dev/flutter/widgets/TextEditingController-class.html Go Now

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initState method - State class - widgets library - Dart API

Details: Called when this object is inserted into the tree. The framework will call this method exactly once for each State object it creates.. Override this method to perform initialization that depends on the location at which this object was inserted into the tree (i.e., context) or on the widget used to configure this object (i.e., widget). If a State's build method depends on an object that can

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› Url: https://api.flutter.dev/flutter/widgets/State/initState.html Go Now

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Adding an iOS App Clip target - Flutter

Details: Important: This experimental preview currently exceeds the 10MB uncompressed IPA payload size limit and cannot be used in production (). This guide describes how to manually add another Flutter-rendering iOS App Clip target to your existing Flutter project or add-to-app project.. Warning: This is an advanced guide and is best intended for audience with a working knowledge of iOS development.

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› Url: https://flutter.dev/docs/development/platform-integration/ios-app-clip Go Now

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SingleChildScrollView class - widgets library - Dart API

Details: Expanding content to fit the viewport. The following example builds on the previous one. In addition to providing a minimum dimension for the child Column, an IntrinsicHeight widget is used to force the column to be exactly as big as its contents. This constraint combines with the ConstrainedBox constraints discussed previously to ensure that the column becomes either as big as viewport, or as

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› Url: https://api.flutter.dev/flutter/widgets/SingleChildScrollView-class.html Go Now

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TextFormField class - material library - Dart API

Details: A FormField that contains a TextField.. This is a convenience widget that wraps a TextField widget in a FormField.. A Form ancestor is not required. The Form simply makes it easier to save, reset, or validate multiple fields at once. To use without a Form, pass a GlobalKey to the constructor and use GlobalKey.currentState to save or reset the form field.. When a controller is specified, its

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› Url: https://api.flutter.dev/flutter/material/TextFormField-class.html Go Now

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Integrate a Flutter module into your iOS project - Flutter

Details: Add your Dart code to the lib/ directory.. Add Flutter dependencies to my_flutter/pubspec.yaml, including Flutter packages and plugins.. The .ios/ hidden subfolder contains an Xcode workspace where you can run a standalone version of your module. It is a wrapper project to bootstrap your Flutter code, and contains helper scripts to facilitate building frameworks or embedding the module into

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› Url: https://flutter.dev/docs/development/add-to-app/ios/project-setup Go Now

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TextStyle class - painting library - Dart API

Details: Opacity and Color. Each line here is progressively more opaque. The base color is material.Colors.black, and Color.withOpacity is used to create a derivative color with the desired opacity. The root TextSpan for this RichText widget is explicitly given the ambient DefaultTextStyle, since RichText does not do that automatically. The inner TextStyle objects are implicitly mixed with the parent

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› Url: https://api.flutter.dev/flutter/painting/TextStyle-class.html Go Now

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ListTile class - material library - Dart API

Details: A list tile contains one to three lines of text optionally flanked by icons or other widgets, such as check boxes. The icons (or other widgets) for the tile are defined with the leading and trailing parameters. The first line of text is not optional and is specified with title.The value of subtitle, which is optional, will occupy the space allocated for an additional line of text, or two lines

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› Url: https://api.flutter.dev/flutter/material/ListTile-class.html Go Now

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split method - String class - dart:core library - Dart API

Details: API docs for the split method from the String class, for the Dart programming language.

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StatelessWidget class - widgets library - Dart API

Details: Stateless widget are useful when the part of the user interface you are describing does not depend on anything other than the configuration information in the object itself and the BuildContext in which the widget is inflated. For compositions that can change dynamically, e.g. due to having an internal clock-driven state, or depending on some system state, consider using StatefulWidget.

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› Url: https://api.flutter.dev/flutter/widgets/StatelessWidget-class.html Go Now

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Flutter SDK releases - Flutter

Details: The Stable channel contains the most stable Flutter builds. See Flutter’s channels for details.. Note: As of release 1.17 (stable), we’ve updated our release process, including changes to how we name releases and their download files. For details, see the “Updating our release process” section in the Flutter Spring 2020 Update blog post.

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› Url: https://flutter.dev/docs/development/tools/sdk/releases Go Now

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Slider class - material library - Dart API

Details: A slider can be used to select from either a continuous or a discrete set of values. The default is to use a continuous range of values from min to max.To use discrete values, use a non-null value for divisions, which indicates the number of discrete intervals.For example, if min is 0.0 and max is 50.0 and divisions is 5, then the slider can take on the discrete values 0.0, 10.0, 20.0, 30.0

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› Url: https://api.flutter.dev/flutter/material/Slider-class.html Go Now

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Cloud Firestore - FlutterFire | FlutterFire

Details: Transactions#. Transactions are a way to ensure that a write operation only occurs using the latest data available on the server. Transactions never partially apply writes, and writes execute at the end of a successful transaction.

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› Url: https://firebase.flutter.dev/docs/firestore/usage/ Go Now

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Fade in images with a placeholder - Flutter

Details: When displaying images using the default Image widget, you might notice they simply pop onto the screen as they’re loaded. This might feel visually jarring to your users. Instead, wouldn’t it be nice to display a placeholder at first, and images would fade in as they’re loaded?

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› Url: https://flutter.dev/docs/cookbook/images/fading-in-images Go Now

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