适配中英文切换

app/src/main/java/com/example/defenseapplication/utils/LanguageUtil.kt

@@ -0,0 +1,115 @@
+package com.example.defenseapplication.utils
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.content.res.Configuration
+import android.content.res.Resources
+import android.os.Build
+import android.os.LocaleList
+import java.util.Locale
+
+object LanguageUtil {
+
+    private const val PREF_NAME = "language_pref"
+    private const val KEY_LANGUAGE = "selected_language"
+
+    const val LANGUAGE_CHINESE = "zh"
+    const val LANGUAGE_ENGLISH = "en"
+
+    /**
+     * 切换语言
+     * @param context 上下文
+     * @param language 语言代码: "zh" 中文, "en" 英文
+     */
+    fun switchLanguage(context: Context, language: String) {
+        saveLanguage(context, language)
+    }
+
+    /**
+     * 获取当前设置的语言
+     */
+    fun getCurrentLanguage(context: Context): String {
+        val prefs = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE)
+        return prefs.getString(KEY_LANGUAGE, LANGUAGE_CHINESE) ?: LANGUAGE_CHINESE
+    }
+
+    /**
+     * 保存语言设置
+     */
+    private fun saveLanguage(context: Context, language: String) {
+        val prefs = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE)
+        prefs.edit().putString(KEY_LANGUAGE, language).apply()
+    }
+
+    /**
+     * 判断当前是否是中文
+     */
+    fun isChinese(context: Context): Boolean {
+        return getCurrentLanguage(context) == LANGUAGE_CHINESE
+    }
+
+    /**
+     * 获取本地化的 Context（用于在应用内切换语言）
+     * 在 attachBaseContext 中调用
+     */
+    fun attachBaseContext(context: Context): Context {
+        val language = getCurrentLanguage(context)
+        return createLocalizedContext(context, language)
+    }
+
+    /**
+     * 创建本地化的 Context
+     */
+    private fun createLocalizedContext(context: Context, language: String): Context {
+        val locale = Locale(language)
+        Locale.setDefault(locale)
+
+        val resources = context.resources
+        val configuration = resources.configuration
+
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            // Android 7.0 及以上
+            val localeList = LocaleList(locale)
+            configuration.setLocales(localeList)
+            context.createConfigurationContext(configuration)
+        } else {
+            // Android 7.0 以下
+            configuration.locale = locale
+            resources.updateConfiguration(configuration, resources.displayMetrics)
+            context
+        }
+    }
+
+    /**
+     * 更新应用语言（用于在 Activity 中动态切换）
+     */
+    fun updateResources(context: Context): Context {
+        val language = getCurrentLanguage(context)
+        val locale = Locale(language)
+        Locale.setDefault(locale)
+
+        val resources = context.resources
+        val configuration = resources.configuration
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            val localeList = LocaleList(locale)
+            configuration.setLocales(localeList)
+        } else {
+            configuration.locale = locale
+        }
+
+        resources.updateConfiguration(configuration, resources.displayMetrics)
+        return context
+    }
+
+    /**
+     * 获取语言显示名称
+     */
+    fun getLanguageDisplayName(language: String): String {
+        return when (language) {
+            LANGUAGE_CHINESE -> "中文"
+            LANGUAGE_ENGLISH -> "English"
+            else -> "中文"
+        }
+    }
+}