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Android accessibility ensures apps are usable by everyone, including people with disabilities. Implement content descriptions for all interactive elements using android:contentDescription. Support focus navigation with appropriate focus ordering. Use sufficient color contrast ratios of at least 4.5:1 for text. Support font scaling to respect system font size settings. Implement TalkBack exploration by grouping related elements. Provide meaningful error messages and success confirmations. Use touch target sizes of at least 48dp for interactive elements. Implement keyboard navigation for users who cannot use touch. Support switch access for users with . Test with accessibility tools like Accessibility Scanner. Use relative instead of absolute positioning for flexible layouts. Provide captions and transcripts for audio and video content. Avoid time-based interactions that pressure users. Use semantic HTML-like element roles in custom views. Support directional gestures with visual alternatives. Test with real users who have disabilities. Accessibility improvements benefit all users, not just those with disabilities. Google Play highlights accessible apps in search results. Building accessible apps is both ethical and commercially beneficial.