Android Studio / IntelliJ

Domains: Flutter

 Create the app

Do you also want to run your Flutter app on the web? The web version of Flutter is available as an early support release, meaning that features are missing and it’s not yet ready for production use. If you want to try it out, follow these instructions.

  1. Open the IDE and select Start a new Flutter project.
  2. Select Flutter Application as the project type. Then click Next.
  3. Verify the Flutter SDK path specifies the SDK’s location (select Install SDK… if the text field is blank).
  4. Enter a project name (for example, myapp). Then click Next.
  5. Click Finish.
  6. Wait for Android Studio to install the SDK and create the project.

Note: When creating a new Flutter app, some Flutter IDE plugins ask for a company domain name in reverse order, something like com.example. The company domain name and project name are used together as the package name for Android (the Bundle ID for iOS) when the app is released. If you think that the app might be released, it’s better to specify the package name now. The package name can’t be changed once the app is released, so make the name unique.

The above commands create a Flutter project directory called myapp that contains a simple demo app that uses Material Components.

Tip: The code for your app is in lib/main.dart. For a high-level description of what each code block does, see the comments at the top of that file.

Run the app

  1. Locate the main Android Studio toolbar:
  2. In the target selector, select an Android device for running the app. If none are listed as available, select Tools> Android > AVD Manager and create one there. For details, see Managing AVDs.
  3. Click the run icon in the toolbar, or invoke the menu item Run > Run.

After the app build completes, you’ll see the starter app on your device.

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.

  1. Open lib/main.dart.
  2. Change the string

    		You have pushed the button this many times'


    		'You have clicked the button this many times'

    Important: Do not stop your app. Let your app run.

  3. Save your changes: invoke Save All, or click Hot Reload.

You’ll see the updated string in the running app almost immediately.

Profile or release runs

Important: Do not test the performance of your app with debug and hot reload enabled.

So far you’ve been running your app in debug mode. Debug mode trades performance for useful developer features such as hot reload and step debugging. It’s not unexpected to see slow performance and janky animations in debug mode. Once you are ready to analyze performance or release your app, you’ll want to use Flutter’s “profile” or “release” build modes. For more details, see Flutter’s build modes.

Important: If you’re concerned about the package size of your app, see Measuring your app’s size. 

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