App localization expands market reach beyond English-speaking users. Extract all user-facing strings to strings.xml resource files. Default values directory stores primary language strings. use language-region qualifiers: values-es-rMX. String formatting handles variable injection with %s and %d. Quantity strings handle plural rules for different languages. Date and time formatting uses DateFormat and DateUtils. Number formatting handles decimal separators and currencies. Right-to-left layout support with RTL qualifiers. Layout mirroring with start/end instead of left/right. Bidirectional text handling for mixed RTL/LTR content. Translatable attribute marks strings for translation tooling. Pseudolocales test localization without real translations. Google Play Console manages store listing translation. Translation services integrate with Android resource format. Cultural adaptation considers images, colors, and symbols. Testing with locale switching during development. RTL testing ensures proper layout mirroring. Localized screenshots for different markets. App localization can increase downloads by 128% per language.
