---
name: android-legacy-security-8c0433780309
description: Harden Intent handling, WebView configuration, and FileProvider access in Android apps. Use when securing Intent extras, configuring WebViews, or exposing files via FileProvider; defer manifest export flags and generic Bundle typing to focused Android security guidance.
metadata:
  triggers:
    files:
    - '**/*Activity.kt'
    - '**/*WebView*.kt'
    - 'AndroidManifest.xml'
    keywords:
    - Intent
    - WebView
    - FileProvider
    - javaScriptEnabled
---
# Android Legacy Security Standards

## **Priority: P0 (CRITICAL)**

## 1. Secure Intents and Components

- Set `android:exported="false"` for all internal Activities/Services unless needed for deep links.
- Verify `resolveActivity` before starting implicit intents.
- Treat all incoming Intent extras as untrusted — validate all schema/data types.

See [hardening examples](references/implementation.md) for manifest and component restrictions.

## 2. Lock Down WebViews

- Default to `javaScriptEnabled = false`. Use `WebViewClient` and `WebChromeClient` to restrict navigation.
- Disable `allowFileAccess` and `allowFileAccessFromFileURLs` to prevent local file theft via XSS.
- If using `@JavascriptInterface` (API 17+), strictly limit exposed API surface.

See [hardening examples](references/implementation.md) for WebView lockdown patterns.

## 3. Protect Storage and Files

- **NEVER expose `file://` URIs**. Use `FileProvider` to generate `content://` URIs with temporary permissions.
- Use `EncryptedSharedPreferences` for auth tokens and PII. Never use legacy public-read file modes.
- Use `NetworkSecurityConfig` to disable `cleartextTrafficPermitted` and implement certificate pinning.

## Anti-Patterns

- **No Implicit Intents Internally**: Use explicit intents with component class name.
- **No Public Read Modes**: Never expose SharedPreferences or files with global read access.

## References

- [Hardening Examples](references/implementation.md)


---
Source attribution: HoangNguyen0403
Original project: https://github.com/HoangNguyen0403/agent-skills-standard
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2026 Gabriel Moreira

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: HoangNguyen0403
Original project: https://github.com/HoangNguyen0403/agent-skills-standard
Attribution basis: Upstream repository explicitly recorded in package mirror path

Fields of work: Development & Engineering
Roles: Mobile Developer, Security Engineer
Specialties: Mobile
Tools: Android
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 0baffc645ebebc4c3d91ea32ca1f7c36fee27bc84d84007f818f5a5474f919ca