android-accessibility（安卓辅助功能）

Android Accessibility Checklist

Instructions

Analyze the provided component or screen for the following accessibility aspects.

1. Content Descriptions

• Check: Do Image and Icon composables have a meaningful contentDescription?
• Decorative: If an image is purely decorative, use contentDescription = null.
• Actionable: If an element is clickable, the description should describe the *action* (e.g., "Play music"), not the icon (e.g., "Triangle").

2. Touch Target Size

• Standard: Minimum 48x48dp for all interactive elements.
• Fix: Use MinTouchTargetSize or wrap in Box with appropriate padding if the visual icon is smaller.

3. Color Contrast

• Standard: WCAG AA requires 4.5:1 for normal text and 3.0:1 for large text/icons.
• Tool: Verify colors against backgrounds using contrast logic.

4. Focus & Semantics

• Focus Order: Ensure keyboard/screen-reader focus moves logically (e.g., Top-Start to Bottom-End).
• Grouping: Use Modifier.semantics(mergeDescendants = true) for complex items (like a row with text and icon) so they are announced as a single item.
• State descriptions: Use stateDescription to describe custom states (e.g., "Selected", "Checked") if standard semantics aren't enough.

5. Headings

• Traversal: Mark title texts with Modifier.semantics {heading()} to allow screen reader users to jump between sections.

Example Prompts for Agent Usage

• "Analyze the content description of this Image. Is it appropriate?"
• "Check if the touch target size of this button is at least 48dp."
• "Does this custom toggle button report its 'Checked' state to TalkBack?"