Test drive

This page describes how to create a new Flutter app from templates, run it, and experience “hot reload” after you make changes to the app.

Select your development tool of choice for writing, building, and running Flutter apps.

Create the app

Invoke View > Command Palette.
Type “flutter”, and select the Flutter: New Project.
Select Application.
Create or select the parent directory for the new project folder.
Enter a project name, such as my_app, and press Enter.
Wait for project creation to complete and the main.dart file to appear.

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

Run the app

Locate the VS Code status bar (the blue bar at the bottom of the window):
Select a device from the Device Selector area. For details, see Quickly switching between Flutter devices.
- If no device is available, and you want to use a device simulator, click No Devices and click Start iOS Simulator to launch a simulator.
  Warning: You might not see Start iOS Simulator option when you click No Devices in VS Code. If you’re on Mac, then you might have to run following command in terminal to launch a simulator.
  $ open -a simulator
  On Windows or Linux, it’s not possible to launch an iOS simulator.
- To setup a real device, follow the device-specific instructions on the Install page for your OS.
Invoke Run > Start Debugging or press F5.
Wait for the app to launch—progress is printed in the Debug Console view.

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.

Open lib/main.dart.

Change the string

'You have pushed the button this many times'

'You have clicked the button this many times'

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

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.

Create the app

Open the IDE and select New Flutter Project.
Select Flutter, verify the Flutter SDK path with the SDK’s location. Then click Next.
Enter a project name (for example, my_app).
Select Application as the project type. Then click Next.
Click Finish.
Wait for Android Studio to create the project.

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

Run the app

Locate the main Android Studio toolbar:
In the target selector, select an Android device for running the app. If none are listed as available, select Tools > AVD Manager and create one there. For details, see Managing AVDs.
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

Open lib/main.dart.

Change the string

'You have pushed the button this many times'

'You have clicked the button this many times'

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

Create the app

Use the flutter create command to create a new project:

$ flutter create my_app
$ cd my_app

It is also possible to pass other arguments to flutter create, such as the project name, the organization name, or to specify the programming language used for the native platform:

$ flutter create --project-name my_app --org dev.flutter --android-language java --ios-language objc my_app
$ cd my_app

The command creates a Flutter project directory called my_app that contains a simple demo app that uses Material Components.

Run the app

Check that an Android device is running. If none are shown, follow the device-specific instructions on the Install page for your OS.
```
$ flutter devices
```
Run the app with the following command:
```
$ flutter run
```

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

Try hot reload

Open lib/main.dart.

Change the string

'You have pushed the button this many times'

'You have clicked the button this many times'

Save your changes.
Type r in the terminal window.

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