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wzjs 2025/9/21 6:47:35

中铁建设集团有限公司电话号码,东莞seo排名扣费,做商城网站还要服务器,百度免费网站制作以下是对语言切换功能的深度优化方案，结合了现代 Android 开发的最佳实践和性能优化技巧： 1. LocaleManager (支持双向布局和系统回退) SuppressLint("AppBundleLocaleChanges") object LocaleManager {private const val PREF_LANGUAGE_KEY…

以下是对语言切换功能的深度优化方案，结合了现代 Android 开发的最佳实践和性能优化技巧：

1. LocaleManager (支持双向布局和系统回退)

@SuppressLint("AppBundleLocaleChanges")
object LocaleManager {private const val PREF_LANGUAGE_KEY = "app_language_preference"private val supportedLocales = mapOf("en" to Locale("en"),"zh" to Locale("zh"),"es" to Locale("es"),"ar" to Locale("ar")  // 阿拉伯语测试RTL)// 使用内存缓存提升性能private var cachedLocale: Locale? = nullfun getSupportedLanguages(): Map<String, String> = mapOf("en" to "English","zh" to "中文","es" to "Español","ar" to "العربية")fun applyLocale(context: Context): Context {val locale = getSavedLocale(context)return updateContext(context, locale)}fun setAppLocale(context: Context, languageCode: String): Context {val locale = supportedLocales[languageCode] ?: Locale.getDefault()persistLocale(context, locale)cachedLocale = localereturn updateContext(context, locale)}private fun updateContext(context: Context, locale: Locale): Context {Locale.setDefault(locale)val resources = context.resourcesval config = Configuration(resources.configuration).apply {if (Build.VERSION.SDK_INT >= 24) {setLocale(locale)setLayoutDirection(locale)} else {@Suppress("DEPRECATION")this.locale = locale}}return when {Build.VERSION.SDK_INT >= 24 -> {context.createConfigurationContext(config)}Build.VERSION.SDK_INT >= 17 -> {context.createConfigurationContext(config)}else -> {@Suppress("DEPRECATION")resources.updateConfiguration(config, resources.displayMetrics)context}}}private fun persistLocale(context: Context, locale: Locale) {context.getSharedPreferences("AppSettings", Context.MODE_PRIVATE).edit {putString(PREF_LANGUAGE_KEY, locale.language)}}private fun getSavedLocale(context: Context): Locale {return cachedLocale ?: run {val prefs = context.getSharedPreferences("AppSettings", Context.MODE_PRIVATE)val langCode = prefs.getString(PREF_LANGUAGE_KEY, null)supportedLocales[langCode] ?: getSystemLocale(context)}.also { cachedLocale = it }}private fun getSystemLocale(context: Context): Locale {return if (Build.VERSION.SDK_INT >= 24) {context.resources.configuration.locales[0]} else {@Suppress("DEPRECATION")context.resources.configuration.locale}}
}

2. 优化的 Activity 基类 (支持配置变更)

abstract class LocaleAwareActivity : ComponentActivity() {override fun attachBaseContext(newBase: Context) {super.attachBaseContext(LocaleManager.applyLocale(newBase))}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)observeLanguageChanges()}private fun observeLanguageChanges() {// 监听系统语言变化（可选）registerComponentActivityCallbacks(object : ComponentActivityCallbacks() {override fun onConfigurationChanged(newConfig: Configuration) {if (newConfig.locales[0] != LocaleManager.getSavedLocale(this@LocaleAwareActivity)) {recreate()}}})}protected fun restartWithLocale(languageCode: String) {LocaleManager.setAppLocale(this, languageCode)startActivity(Intent(this, this::class.java).apply {flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK})overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out)}
}

3. 使用 ViewModel + Flow 的状态管理

class LanguageViewModel(application: Application) : AndroidViewModel(application) {private val _currentLanguage = MutableStateFlow(LocaleManager.getSavedLocale(application).language)val currentLanguage: StateFlow<String> = _currentLanguagefun changeLanguage(languageCode: String) {_currentLanguage.value = languageCodeLocaleManager.setAppLocale(getApplication(), languageCode)}
}@Composable
fun rememberLanguageState(): LanguageViewModel {val factory = remember { object : ViewModelProvider.Factory {override fun <T : ViewModel> create(modelClass: Class<T>): T {return LanguageViewModel(LocalContext.current.applicationContext as Application) as T}}}return viewModel(factory = factory)
}

4. 极致优化的 UI 实现

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun LanguageScreen(modifier: Modifier = Modifier,onBack: () -> Unit = {}
) {val viewModel = rememberLanguageState()val currentLanguage by viewModel.currentLanguage.collectAsState()val context = LocalContext.currentScaffold(modifier = modifier,topBar = {CenterAlignedTopAppBar(title = { Text(stringResource(R.string.language_settings)) },navigationIcon = {IconButton(onClick = onBack) {Icon(Icons.Default.ArrowBack, contentDescription = null)}})}) { padding ->LanguageSelectionList(modifier = Modifier.padding(padding),currentLanguage = currentLanguage,onLanguageSelected = { lang ->viewModel.changeLanguage(lang)(context as? Activity)?.let {it.restartWithLocale(lang)}})}
}@Composable
private fun LanguageSelectionList(modifier: Modifier = Modifier,currentLanguage: String,onLanguageSelected: (String) -> Unit
) {val languages = LocaleManager.getSupportedLanguages()LazyColumn(modifier = modifier) {items(languages.keys.toList()) { langCode ->LanguageListItem(languageName = languages[langCode] ?: "",isSelected = langCode == currentLanguage,onClick = { onLanguageSelected(langCode) })}}
}@Composable
private fun LanguageListItem(languageName: String,isSelected: Boolean,onClick: () -> Unit
) {ListItem(headlineContent = { Text(languageName) },trailingContent = {if (isSelected) {Icon(imageVector = Icons.Default.Check,contentDescription = stringResource(R.string.selected))}},modifier = Modifier.clickable(onClick = onClick))
}

5. 扩展函数简化调用

fun Context.restartApp() {val intent = Intent(this, MainActivity::class.java).apply {flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK}startActivity(intent)if (this is Activity) {overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out)finish()}
}fun Fragment.restartApp() {requireActivity().restartApp()
}