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Part of this code we've just added asks for permission to use the camera. This is a common feature of modern app platforms - you can't access hardware features without explicitly asking the user's permission first.
However, this request comes in two parts. The first is in the code we've just seen; but before the app can ask for permissions, it needs to declare the permissions it is going to ask for.
The permissions required by each platform are slightly different, but Briefcase has a cross-platform representation for many common hardware permissions. In the ``[tool.briefcase.app.helloworld]`` configuration section of your app's ``pyproject.toml`` file, add the following (just above the ``sources`` declaration):
This declares that your app needs to access the camera, and provides a short description why the camera is required. This description is needed on some platforms (most notably macOS and iOS) and will be displayed to the user as a additional information when the permission dialog is presented.
We can now generate and run the app:
macOS
Android
When the app runs, you'll be presented with a button. Press the button, and the platform's default camera dialog will be displayed. Take a photo; the camera dialog will disappear, and the photo will be displayed on in the app, just above the button. You could then take another photo; this will replace the first photo.
Adding more permissions
Permissions are declared in the files that are generated during the original call to ``briefcase create``. Unfortunately, Briefcase can't update these files once they've been initially generated; so if you want to add a new permission to your app, or modify existing permissions, you'll need to re-create the app. You can do this by re-running ``briefcase create``; this will warn you that the existing app will be overwritten, and then regenerate the application with the new permissions.

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  1. BeeWare
  2. Tutorial
  3. Topics
  4. camera-access
  5. English
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a month ago
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read-only
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../../tutorial/topics/camera-access.rst:158 • a891662d2ba045f6819db83a454e5f30
String age
a month ago
Last updated
a month ago
Source string age
a month ago
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