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unlock the keychain. For more information, see this |
question on StackExchange.<topic_end> |
<topic_start> |
Run app without breakpoints |
Go to Run > Start Without Debugging.You can also press Ctrl + F5.<topic_end> |
<topic_start> |
Run app with breakpoints |
Click Run > Start Debugging. |
You can also press F5. |
The status bar turns orange to show you are in a debug session. |
<topic_end> |
<topic_start> |
Run app in debug, profile, or release mode |
Flutter offers many different build modes to run your app in. |
You can read more about them in Flutter’s build modes.Open the launch.json file in VS Code.If you don’t have a launch.json file:Go to View > Run.You can also press Ctrl / Cmd + |
Shift + DThe Run and Debug panel displays.Click create a launch.json file.In the configurations section, |
change the flutterMode property to |
the build mode you want to target.For example, if you want to run in debug mode, |
your launch.json might look like this:Run the app through the Run panel.<topic_end> |
<topic_start> |
Fast edit and refresh development cycle |
Flutter offers a best-in-class developer cycle enabling you |
to see the effect of your changes almost instantly with the |
Stateful Hot Reload feature. |
To learn more, check out Hot reload.<topic_end> |
<topic_start> |
Advanced debugging |
You might find the following advanced debugging tips useful:<topic_end> |
<topic_start> |
Debugging visual layout issues |
During a debug session, |
several additional debugging commands are added to the |
Command Palette and to the Flutter inspector. |
When space is limited, the icon is used as the visual |
version of the label.<topic_end> |
<topic_start> |
Debugging external libraries |
By default, debugging an external library is disabled |
in the Flutter extension. To enable:<topic_end> |
<topic_start> |
Editing tips for Flutter code |
If you have additional tips we should share, let us know!<topic_end> |
<topic_start> |
Assists & quick fixes |
Assists are code changes related to a certain code identifier. |
A number of these are available when the cursor is placed on a |
Flutter widget identifier, as indicated by the yellow lightbulb icon. |
To invoke the assist, click the lightbulb as shown in the following screenshot:You can also press Ctrl / Cmd + .Quick fixes are similar, |
only they are shown with a piece of code has an error and they |
can assist in correcting it.<topic_end> |
<topic_start> |
Snippets |
Snippets can be used to speed up entering typical code structures. |
They are invoked by typing their prefix, |
and then selecting from the code completion window: |
The Flutter extension includes the following snippets:You can also define custom snippets by executing |
Configure User Snippets from the Command Palette.<topic_end> |
<topic_start> |
Keyboard shortcuts |
You can also press Ctrl + F5 |
(Cmd + F5 on macOS).Keyboard mappings can be changed by executing the |
Open Keyboard Shortcuts command from the Command Palette.<topic_end> |
<topic_start> |
Hot reload vs. hot restart |
Hot reload works by injecting updated source code files into the |
running Dart VM (Virtual Machine). This includes not only |
adding new classes, but also adding methods and fields to |
existing classes, and changing existing functions. |
A few types of code changes cannot be hot reloaded though:For these changes, restart your app without |
ending your debugging session. To perform a hot restart, |
run the Flutter: Hot Restart command from the Command Palette.You can also press |
Ctrl + Shift + F5 |
or Cmd + Shift + F5 on macOS.<topic_end> |
<topic_start> |
Troubleshooting |
<topic_end> |
<topic_start> |
Known issues and feedback |
All known bugs are tracked in the issue tracker: |
Dart and Flutter extensions GitHub issue tracker. |
We welcome feedback, |
both on bugs/issues and feature requests.Prior to filing new issues:When filing new issues, include flutter doctor output. |
<topic_end> |
<topic_start>DevTools |
<topic_end> |
<topic_start> |
What is DevTools? |
DevTools is a suite of performance and debugging tools |
for Dart and Flutter.For a video introduction to DevTools, check out |
the following deep dive and use case walkthrough:Dive in to DevTools<topic_end> |
<topic_start> |
What can I do with DevTools? |
Here are some of the things you can do with DevTools:We expect you to use DevTools in conjunction with |
your existing IDE or command-line based development workflow. |
<topic_end> |
<topic_start> |
How to start DevTools |
See the VS Code, Android Studio/IntelliJ, or |
command line pages for instructions on how to start DevTools.<topic_end> |
<topic_start> |
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