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launch DevTools from the toolbar/menu
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once an app is running,
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you can start DevTools using one of the following:
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<topic_end>
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<topic_start>
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launch DevTools from an action
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you can also open DevTools from an IntelliJ action.
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open the find action… dialog
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(on macOS, press cmd + shift + a),
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and search for the open DevTools action.
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when you select that action,
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DevTools is installed (if it isn’t already), the DevTools server
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launches, and a browser instance opens pointing to the DevTools app.
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when opened with an IntelliJ action, DevTools is not connected
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to a flutter app. you’ll need to provide a service protocol port
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for a currently running app. you can do this using the inline
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connect to a running app dialog.
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<topic_end>
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<topic_start>
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install and run DevTools from VS code
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<topic_end>
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<topic_start>
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install the VS code extensions
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to use the DevTools from VS code, you need the dart extension.
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if you’re debugging flutter applications, you should also install
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the flutter extension.
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<topic_end>
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<topic_start>
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start an application to debug
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start a debug session for your application by opening the root
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folder of your project (the one containing pubspec.yaml)
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in VS code and clicking run > start debugging (f5).
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<topic_end>
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<topic_start>
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launch DevTools
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once the debug session is active and the application has started,
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the open DevTools commands become available in the
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VS code command palette (f1):
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the chosen tool will be opened embedded inside VS code.
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you can choose to have DevTools always opened in a browser with the
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dart.embedDevTools setting, and control whether it opens as a full window or
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in a new column next to your current editor with the dart.devToolsLocation
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setting.
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a full list of Dart/Flutter settings are available
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here or in the
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VS code settings editor.
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some recommendation settings for Dart/Flutter in VS code can be found
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here.
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you can also see whether DevTools is running and launch it in a browser from the
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language status area (the {} icon next to dart in the status bar).
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<topic_end>
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<topic_start>
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install and run DevTools from the command line
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to run dart DevTools from the CLI, you must have dart on your path. then
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you can run the following command to launch DevTools:
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to upgrade DevTools, upgrade your dart SDK. if a newer dart SDK
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includes a newer version of DevTools, dart devtools will automatically
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launch this version. if which dart points to the dart SDK included in
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your flutter SDK, then DevTools will be upgraded when you upgrade your
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flutter SDK to a newer version.
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when you run DevTools from the command line, you should see output that
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looks something like:
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<topic_end>
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<topic_start>
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start an application to debug
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next, start an app to connect to.
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this can be either a flutter application
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or a dart command-line application.
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the command below specifies a flutter app:
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you need to have a device connected, or a simulator open,
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for flutter run to work. once the app starts, you’ll see a
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message in your terminal that looks like the following:
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open the DevTools instance connected to your app
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by opening the second link in chrome.
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this URL contains a security token,
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so it’s different for each run of your app.
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this means that if you stop your application and re-run it,
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you need to connect to DevTools again with the new URL.
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<topic_end>
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<topic_start>
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connect to a new app instance
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if your app stops running
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or you opened DevTools manually,
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you should see a connect dialog:
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you can manually connect DevTools to a new app instance
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by copying the observatory link you got from running your app,
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such as http://127.0.0.1:52129/QjqebSY4lQ8=/
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and pasting it into the connect dialog:
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<topic_end>
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<topic_start>
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using the flutter inspector
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info note
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the inspector works with all flutter applications.
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<topic_end>
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<topic_start>
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what is it?
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the flutter widget inspector is a powerful tool for visualizing and
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exploring flutter widget trees. the flutter framework uses widgets
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as the core building block for anything from controls
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(such as text, buttons, and toggles),
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