Android Studio and IntelliJ Installation and configuration

To install Flutter and Dart plugins, follow the Setup an editor instructions.

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Plugins Update

Updates are sent out regularly. When an update is available, you should be prompted in your IDE.

You can manually check for updates:

• Open preferences ( Android Studio > Search for Updates On MacOS, Help > Search for Updates On Linux).
• Update flutter and dart to ensure they are up-to-date

Creating projects

Creating new projects

To create a Flutter project using the Flutter starter template:

• Click New Project in the Welcome Window or file > New > Project in the main IDE window.
• Enter the Flutter IDK path, and then click Next.
• Enter the Project Name, Description, and Location.
• Set the company domain if you intend to publish this app.
• Click End.

Setting up the company domain

WHEN CREATING A NEW APP, Flutter IDE plugins require an organization name in reverse-domain order. For example, com. example. This is the package name for Android and the Bundle ID for iOS. It is best to indicate these details if you plan to release the app. These cannot be modified once the app has been removed. Uniqueness is essential for your organization's name.

Creating new projects from an existing source code

To create a Flutter project that contains existing Flutter source codes:

Click New Project in the Welcome Window or New Project in the main IDE window.

• Select Flutterfrom the menu and then click Next.
• Enter or browse to the directory containing your Flutter source code files under Project Location
• Click End.

Viewing and editing issues

The Flutter plugin allows you to perform code analysis.

• Syntax highlighting.
• Rich type analysis is used to complete code.
• Navigation to type declarations ( Navigation > Declaration), as well as finding type usages in Edit > Locate > Find Usages.
• All current source code issues ( View > Tools > Dart Analysis). Dart Analysis pane displays any analysis issues.

Debugging and running

Notice: There are a few ways to debug your app.

• DevTools is a set of profiling and debugging tools used in browsers. It also includes the Flutter inspector. DevTools, a browser-based profiling tool, replaced the observatory.
• Android Studio (or IntelliJ) has built-in debugging capabilities, including the ability to set breakpoints.
• You can use the Flutter inspector directly in Android Studio or IntelliJ.

Below are instructions for Android Studio and IntelliJ features. For more information about launching DevTools, please see Running DevTools From Android Studio in our DevTools documentation.

Selecting a Target

Flutter projects should be open in the IDE. You will see a series of Flutter-specific buttons to the right of the toolbar.

Note that Flutter cannot detect any iOS or Android devices connected to it if the Run and Debug buttons have been disabled and no targets are specified. To proceed, you must click an instrument or start a simulation.

• Click on the Flutter target selector button. This will display a list of all the available targets.
• Choose the target where you would like your app to start. Additional entries will appear when you connect devices or create simulators.

Quick edit and refresh cycle

Flutter's best-in-class developer cycle allows you to see the effects of your changes almost immediately with the Stateful hot reload feature. See Hot fill for details.

Show performance

To see the performance data, including widget rebuild information, open the app in Debug mode and then use View> Tools > Flutter Performance.

Click Show widget rebuild info to see stats about rebuilt devices and how often. In the second column to the right, you will see the exact number of rebuilds for this frame. A yellow spinning circle indicates a high amount of rebuilds. The queue to your right displays how many times a widget has been rebuilt since it was last seen on the screen. A solid grey circle will display for devices that haven't been rebuilt. A grey spinning circle shows otherwise.

This screenshot shows how the app was designed to provide poor performance. The rebuild profiler will give you an indication of what might be causing poor performance. The widget rebuild profiler is not an instrument that can diagnose poor performance.

This feature will alert you when widgets rebuild. You might not be aware of it if you only look at the code. If devices start rebuilding in unexpected ways, this is a sign you need to refactor your code. Split extensive build methods into multiple widgets.

This tool will help you to debug at most four everyday performance issues. A single StatefulWidget builds the screen or significant parts, resulting in unnecessary UI construction. Divide the UI into smaller widgets using more petite build() operations.

Rebuilding widgets that are not visible on screen is possible. This could happen when a ListView is nestled in a Column that extends beyond the screen. The RepaintBoundary may not be set for a list that extends beyond the screen, which can cause the entire list to be redrawn.

An AnimatedBuilder's build() function draws a subtree, which does not require animation. This can lead to unnecessary rebuilds of static objects.

Unnecessarily high widget trees are places for Opacity widgets. An Opacity animation can be created by manipulating the Opacity property of the Opacity Widget, which causes the device and its subtrees to rebuild.

To navigate to the source line where the widget was created, click on the line in Table. The code pane displays spinning icons as the code runs. This helps you see which rebuilds are taking place.

It is possible to have multiple rebuilds without a problem. It would be best not to worry about excessive rebuilds unless you had run the app in profile mode before and confirmed that it is performing poorly.

Remember that widget rebuild information can only be found in a debug. You can test the app's performance using a profile build. However, you can debug performance issues with a debug version.

Live templates

Live templates can be used to speed up the process of entering code structures. These templates can be invoked by entering their prefix and selecting them in the code completion window.

The following templates are available in the Flutter plugin:

• Prefix styles to create a new subclass for StatelessWidget.
• Prefix stful: Create a new StatefulWidget subclass and its associated State subclass.
• Prefix stanine - Create a new StatefulWidget subclass and an associated State subclass.

You can also create custom templates in Settings> Editor > Live Templates.

Hot restart vs. Hot Reload

Hot reload is done by inserting new source code files into Dart VM (Virtual Machine) running. This includes adding new classes, methods, and fields for existing courses and changing functions. Some code changes can't be hot reloaded.

• Global variable initializers
• Static field initializers
• The main() method is part of the app

These changes will allow you to restart your application without closing your debugging session. Do not click the Stop button to perform a hot restart. Instead, re-click either the Run button (if you are in a run session) or the Debug button (in a debug session), then shift-click on the 'hot load' button.

Editing Android code with IntelliJ IDEA

You need to set the Android SDK's location in IntelliJ IDEA to enable Android code editing.

• If you haven't enabled Android Supportin Preferences> Plugins.
• Right-click on the Android folder within the Project view and choose Open Module Setting.
• Locate the SourcesTab and choose level 8 or higher.
• Locate the Module SDKin the Dependencies tab and choose an Android SDK. Click New to specify the Android SDK's location. Select an Android SDK that matches the one used in Flutter (as reported by the flutter physician).
• Click OK.

Conclusion

We are open to receiving feedback on both bugs/issues and feature requests. Before you file new problems:

• To check if the problem has been tracked, search quickly on the issue trackers.
• Make sure that it is the latest version of the plugin.

Include flutter physicians in your new issue filings.

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Hope this article is helpful to you, thanks for reading.

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