[website] Remove usesCleartextTraffic

[mboetger]

Removes deprecated usesCleartextTraffic.

Addresses: flutter/flutter#182553

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[gemini-code-assist]

Summary of Changes

Hello @mboetger, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the documentation for configuring network security policies on Android. It removes an outdated and deprecated method for allowing cleartext traffic and introduces the modern, recommended approach using a network security configuration file. This ensures that developers follow current best practices for Android app development, improving security and maintainability of their applications.

Highlights

• Deprecated usesCleartextTraffic removal: The documentation has been updated to remove references to the deprecated android:usesCleartextTraffic="true" attribute. This change aligns the documentation with current Android best practices.
• Updated Android cleartext traffic configuration: New instructions are provided for configuring cleartext traffic in Android debug builds, utilizing android:networkSecurityConfig and a dedicated network_security_config.xml file, which is the recommended approach.

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Changelog

• src/content/release/breaking-changes/network-policy-ios-android.md
  • Removed the deprecated android:usesCleartextTraffic="true" snippet.
  • Added instructions for using android:networkSecurityConfig to reference a network_security_config.xml file.
  • Included the XML structure for network_security_config.xml to permit cleartext traffic in debug builds.

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[gemini-code-assist]

Code Review

This pull request updates the documentation to recommend using networkSecurityConfig instead of the deprecated usesCleartextTraffic for enabling cleartext HTTP connections in Android debug builds. The change is correct and follows modern Android development practices. I've added one suggestion to fix an incomplete XML tag in a code snippet to prevent potential copy-paste errors for users.

[gemini-code-assist]

The XML snippet for the <application> tag is incomplete as it's not closed and contains a trailing space. This could cause confusion or errors if copied directly. To make it a valid and self-contained snippet, similar to the one it replaced, it should be a self-closing tag.

Suggested change

	<application android:networkSecurityConfig="@xml/network_security_config">
	<application android:networkSecurityConfig="@xml/network_security_config" />

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 3e8f258):

https://flutter-docs-prod--pr13117-remove-usescleartexttraffic-29mxk0fk.web.app

[parlough]

Thanks for finding and updating these @mboetger!

Some small formatting suggestions:

[parlough]

Suggested change

	```xml
	Then, add the network configuration to your
	`<project_path>/android/app/src/debug/res/xml/network_security_config.xml`:
	```xml

[parlough]

Suggested change

	builds, you can add the following snippet to your $project_path\android\app\src\debug\AndroidManifest.xml:
	builds, you can add the following snippet to your
	`<project_path>\android\app\src\debug\AndroidManifest.xml`:

[sfshaza2]

lgtm