Support Per-app language preferences

app/build.gradle

@@ -129,6 +129,10 @@ android {
     lint {
         lintConfig = file("lint.xml")
     }
+
+    androidResources {
+        generateLocaleConfig = true
+    }
 }
 
 allOpen {

app/src/main/AndroidManifest.xml

@@ -55,5 +55,14 @@
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
         </activity>
+
+        <service
+            android:name="androidx.appcompat.app.AppLocalesMetadataHolderService"
+            android:enabled="false"
+            android:exported="false">
+            <meta-data
+                android:name="autoStoreLocales"
+                android:value="true" />
+        </service>
     </application>
 </manifest>

app/src/main/kotlin/com/vrem/util/CompatUtils.kt

@@ -20,19 +20,9 @@ package com.vrem.util
 import android.content.Context
 import android.content.pm.PackageInfo
 import android.content.pm.PackageManager.PackageInfoFlags
-import android.content.res.Configuration
-import android.content.res.Resources
 import android.net.wifi.ScanResult
 import android.os.Build
 import androidx.annotation.RequiresApi
-import java.util.Locale
-
-fun Context.createContext(newLocale: Locale): Context {
-    val resources: Resources = resources
-    val configuration: Configuration = resources.configuration
-    configuration.setLocale(newLocale)
-    return createConfigurationContext(configuration)
-}
 
 fun Context.packageInfo(): PackageInfo =
     if (buildMinVersionT()) {

app/src/main/kotlin/com/vrem/util/LocaleUtils.kt

@@ -20,80 +20,103 @@ package com.vrem.util
 import java.util.Locale
 import java.util.SortedMap
 
-private object SyncAvoid {
-    val defaultLocale: Locale = Locale.getDefault()
-    val countryCodes: Set<String> = Locale.getISOCountries().toSet()
-    val availableLocales: List<Locale> = Locale.getAvailableLocales().filter { countryCodes.contains(it.country) }
-
-    val countriesLocales: SortedMap<String, Locale> =
+private val currentLocale: Locale get() = Locale.getDefault()
+private val countryCodes: Set<String> = Locale.getISOCountries().toSet()
+private val availableLocales: List<Locale> = Locale.getAvailableLocales().filter { countryCodes.contains(it.country) }
+private val countriesLocales: SortedMap<String, Locale>
+    get() =
         availableLocales
-            .associateBy { it.country.toCapitalize(Locale.getDefault()) }
+            .associateBy { it.country.toCapitalize(currentLocale) }
             .toSortedMap()
-    val supportedLocales: List<Locale> =
-        setOf(
-            BULGARIAN,
-            DUTCH,
-            GREEK,
-            HUNGARIAN,
-            Locale.SIMPLIFIED_CHINESE,
-            Locale.TRADITIONAL_CHINESE,
-            Locale.ENGLISH,
-            Locale.FRENCH,
-            Locale.GERMAN,
-            Locale.ITALIAN,
-            Locale.JAPANESE,
-            POLISH,
-            PORTUGUESE_BRAZIL,
-            PORTUGUESE_PORTUGAL,
-            SPANISH,
-            RUSSIAN,
-            TURKISH,
-            UKRAINIAN,
-            defaultLocale,
-        ).toList()
-}
 
 val BULGARIAN: Locale = Locale.forLanguageTag("bg")
+val CHINESE: Locale = Locale.forLanguageTag("zh")
+val CHINESE_SIMPLIFIED: Locale = Locale.forLanguageTag("zh-Hans")
+val CHINESE_TRADITIONAL: Locale = Locale.forLanguageTag("zh-Hant")
 val DUTCH: Locale = Locale.forLanguageTag("nl")
+val ENGLISH: Locale = Locale.forLanguageTag("en")
+val FRENCH: Locale = Locale.forLanguageTag("fr")
+val GERMAN: Locale = Locale.forLanguageTag("de")
 val GREEK: Locale = Locale.forLanguageTag("el")
 val HUNGARIAN: Locale = Locale.forLanguageTag("hu")
+val ITALIAN: Locale = Locale.forLanguageTag("it")
+val JAPANESE: Locale = Locale.forLanguageTag("ja")
 val POLISH: Locale = Locale.forLanguageTag("pl")
-val PORTUGUESE_PORTUGAL: Locale = Locale.forLanguageTag("pt-PT")
 val PORTUGUESE_BRAZIL: Locale = Locale.forLanguageTag("pt-BR")
-val SPANISH: Locale = Locale.forLanguageTag("es")
+val PORTUGUESE_PORTUGAL: Locale = Locale.forLanguageTag("pt-PT")
 val RUSSIAN: Locale = Locale.forLanguageTag("ru")
+val SPANISH: Locale = Locale.forLanguageTag("es")
 val TURKISH: Locale = Locale.forLanguageTag("tr")
 val UKRAINIAN: Locale = Locale.forLanguageTag("uk")
 
-private const val SEPARATOR: String = "_"
+val baseSupportedLocales: List<Locale> =
+    listOf(
+        BULGARIAN,
+        CHINESE_SIMPLIFIED,
+        CHINESE_TRADITIONAL,
+        DUTCH,
+        ENGLISH,
+        FRENCH,
+        GERMAN,
+        GREEK,
+        HUNGARIAN,
+        ITALIAN,
+        JAPANESE,
+        POLISH,
+        PORTUGUESE_BRAZIL,
+        PORTUGUESE_PORTUGAL,
+        RUSSIAN,
+        SPANISH,
+        TURKISH,
+        UKRAINIAN,
+    )
 
 fun findByCountryCode(countryCode: String): Locale =
-    SyncAvoid.availableLocales.firstOrNull { countryCode.toCapitalize(Locale.getDefault()) == it.country }
-        ?: SyncAvoid.defaultLocale
+    availableLocales.firstOrNull { countryCode.uppercase(Locale.ROOT) == it.country }
+        ?: currentLocale
 
-fun allCountries(): List<Locale> = SyncAvoid.countriesLocales.values.toList()
+fun allCountries(): List<Locale> = countriesLocales.values.toList()
 
-fun findByLanguageTag(languageTag: String): Locale {
-    val languageTagPredicate: (Locale) -> Boolean = {
-        val locale: Locale = fromLanguageTag(languageTag)
-        it.language == locale.language && it.country == locale.country
-    }
-    return SyncAvoid.supportedLocales.firstOrNull(languageTagPredicate) ?: SyncAvoid.defaultLocale
-}
+fun supportedLanguages(): List<Locale> = (baseSupportedLocales + currentLocale).distinct()
 
-fun supportedLanguages(): List<Locale> = SyncAvoid.supportedLocales
+fun supportedLanguageTags(): List<String> = listOf("") + baseSupportedLocales.map { it.toLanguageTag() }
 
-fun defaultCountryCode(): String = SyncAvoid.defaultLocale.country
+private fun normalizeLanguageTag(languageTag: String): String = languageTag.replace('_', '-').trim()
 
-fun defaultLanguageTag(): String = toLanguageTag(SyncAvoid.defaultLocale)
+private val chineseCountryToLocale: Map<String, Locale> =
+    mapOf(
+        "CN" to CHINESE_SIMPLIFIED,
+        "SG" to CHINESE_SIMPLIFIED,
+        "TW" to CHINESE_TRADITIONAL,
+        "HK" to CHINESE_TRADITIONAL,
+        "MO" to CHINESE_TRADITIONAL,
+    )
 
-fun toLanguageTag(locale: Locale): String = locale.language + SEPARATOR + locale.country
+fun findByLanguageTag(languageTag: String): Locale {
+    val normalizedLanguageTag = normalizeLanguageTag(languageTag)
+    if (normalizedLanguageTag.isEmpty()) return currentLocale
+    return findSupportedLocale(Locale.forLanguageTag(normalizedLanguageTag))
+}
 
-private fun fromLanguageTag(languageTag: String): Locale {
-    val codes: Array<String> = languageTag.split(SEPARATOR).toTypedArray()
-    return when (codes.size) {
-        1 -> Locale.forLanguageTag(codes[0])
-        2 -> Locale.forLanguageTag("${codes[0]}-${codes[1].toCapitalize(Locale.getDefault())}")
-        else -> SyncAvoid.defaultLocale
+fun findSupportedLocale(target: Locale): Locale {
+    if (target.language.isEmpty()) return currentLocale
+
+    if (target.language == "zh" && target.script.isEmpty()) {
+        if (target.country.isEmpty()) return CHINESE
+        return chineseCountryToLocale[target.country] ?: CHINESE
     }
+
+    return baseSupportedLocales.find { it == target }
+        ?: baseSupportedLocales.find { it.language == target.language && it.script == target.script }
+        ?: baseSupportedLocales.find { it.language == target.language && it.country == target.country }
+        ?: baseSupportedLocales.find { it.language == target.language }
+        ?: currentLocale
 }
+
+fun currentCountryCode(): String = currentLocale.country
+
+fun currentLanguageTag(): String = currentLocale.toLanguageTag()
+
+fun toLanguageTag(locale: Locale): String = locale.toLanguageTag()
+
+fun Locale.toSupportedLocaleTag(): String = findSupportedLocale(this).toLanguageTag()

app/src/main/kotlin/com/vrem/util/StringUtils.kt

@@ -27,3 +27,5 @@ fun String.Companion.nullToEmpty(value: String?): String = value ?: String.EMPTY
 fun String.specialTrim(): String = this.trim { it <= ' ' }.replace(" +".toRegex(), String.SPACE_SEPARATOR)
 
 fun String.toCapitalize(locale: Locale): String = this.replaceFirstChar { word -> word.uppercase(locale) }
+
+fun String.titlecaseFirst(locale: Locale): String = replaceFirstChar { it.titlecase(locale) }

app/src/main/kotlin/com/vrem/wifianalyzer/MainActivity.kt

@@ -17,7 +17,6 @@
  */
 package com.vrem.wifianalyzer
 
-import android.content.Context
 import android.content.SharedPreferences
 import android.content.SharedPreferences.OnSharedPreferenceChangeListener
 import android.content.res.Configuration
@@ -26,18 +25,17 @@ import android.view.Menu
 import android.view.MenuItem
 import android.view.View
 import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.os.LocaleListCompat
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import androidx.core.view.GravityCompat
 import androidx.drawerlayout.widget.DrawerLayout
 import com.google.android.material.navigation.NavigationView
 import com.vrem.annotation.OpenClass
-import com.vrem.util.createContext
 import com.vrem.wifianalyzer.navigation.NavigationMenu
 import com.vrem.wifianalyzer.navigation.NavigationMenuControl
 import com.vrem.wifianalyzer.navigation.NavigationMenuController
 import com.vrem.wifianalyzer.navigation.options.OptionMenu
-import com.vrem.wifianalyzer.settings.Repository
-import com.vrem.wifianalyzer.settings.Settings
 import com.vrem.wifianalyzer.wifi.accesspoint.ConnectionView
 import com.vrem.wifianalyzer.wifi.scanner.ScannerService
 
@@ -52,15 +50,13 @@ class MainActivity :
     internal lateinit var optionMenu: OptionMenu
     internal lateinit var connectionView: ConnectionView
 
-    override fun attachBaseContext(newBase: Context) =
-        super.attachBaseContext(newBase.createContext(Settings(Repository(newBase)).languageLocale()))
-
     override fun onCreate(savedInstanceState: Bundle?) {
         val mainContext = MainContext.INSTANCE
         mainContext.initialize(this, largeScreen)
 
         val settings = mainContext.settings
         settings.initializeDefaultValues()
+        settings.syncLanguage()
         settings.themeStyle().setTheme(this)
 
         mainReload = MainReload(settings)
@@ -69,7 +65,6 @@ class MainActivity :
         installSplashScreen()
         setContentView(R.layout.main_activity)
 
-        settings.registerOnSharedPreferenceChangeListener(this)
         optionMenu = OptionMenu()
 
         keepScreenOn()
@@ -84,9 +79,16 @@ class MainActivity :
 
         connectionView = ConnectionView(this)
 
+        settings.registerOnSharedPreferenceChangeListener(this)
+
         onBackPressedDispatcher.addCallback(this, MainActivityBackPressed(this))
     }
 
+    override fun onDestroy() {
+        MainContext.INSTANCE.settings.unregisterOnSharedPreferenceChangeListener(this)
+        super.onDestroy()
+    }
+
     public override fun onPostCreate(savedInstanceState: Bundle?) {
         super.onPostCreate(savedInstanceState)
         drawerNavigation.syncState()
@@ -120,6 +122,18 @@ class MainActivity :
         sharedPreferences: SharedPreferences,
         key: String?,
     ) {
+        val languageKey = getString(R.string.language_key)
+        if (key == languageKey) {
+            val languageTag = sharedPreferences.getString(languageKey, "")
+            val locales =
+                languageTag
+                    ?.takeIf { it.isNotEmpty() }
+                    ?.let(LocaleListCompat::forLanguageTags)
+                    ?: LocaleListCompat.getEmptyLocaleList()
+
+            AppCompatDelegate.setApplicationLocales(locales)
+        }
+
         val mainContext = MainContext.INSTANCE
         if (mainReload.shouldReload(mainContext.settings)) {
             MainContext.INSTANCE.scannerService.stop()

app/src/main/kotlin/com/vrem/wifianalyzer/MainReload.kt

@@ -20,7 +20,6 @@ package com.vrem.wifianalyzer
 import com.vrem.wifianalyzer.settings.Settings
 import com.vrem.wifianalyzer.settings.ThemeStyle
 import com.vrem.wifianalyzer.wifi.accesspoint.ConnectionViewType
-import java.util.Locale
 
 class MainReload(
     settings: Settings,
@@ -29,11 +28,8 @@ class MainReload(
         private set
     var connectionViewType: ConnectionViewType
         private set
-    var languageLocale: Locale
-        private set
 
-    fun shouldReload(settings: Settings): Boolean =
-        themeChanged(settings) || connectionViewTypeChanged(settings) || languageChanged(settings)
+    fun shouldReload(settings: Settings): Boolean = themeChanged(settings) || connectionViewTypeChanged(settings)
 
     private fun connectionViewTypeChanged(settings: Settings): Boolean {
         val currentConnectionViewType = settings.connectionViewType()
@@ -53,18 +49,8 @@ class MainReload(
         return themeChanged
     }
 
-    private fun languageChanged(settings: Settings): Boolean {
-        val settingLanguageLocale = settings.languageLocale()
-        val languageLocaleChanged = languageLocale != settingLanguageLocale
-        if (languageLocaleChanged) {
-            languageLocale = settingLanguageLocale
-        }
-        return languageLocaleChanged
-    }
-
     init {
         themeStyle = settings.themeStyle()
         connectionViewType = settings.connectionViewType()
-        languageLocale = settings.languageLocale()
     }
 }

app/src/main/kotlin/com/vrem/wifianalyzer/settings/CountryPreference.kt

@@ -19,13 +19,13 @@ package com.vrem.wifianalyzer.settings
 
 import android.content.Context
 import android.util.AttributeSet
-import com.vrem.util.defaultCountryCode
+import com.vrem.util.currentCountryCode
 import com.vrem.wifianalyzer.MainContext
 import com.vrem.wifianalyzer.wifi.band.WiFiChannelCountry
 import java.util.Locale
 
 private fun data(): List<Data> {
-    val currentLocale: Locale = MainContext.INSTANCE.settings.languageLocale()
+    val currentLocale: Locale = MainContext.INSTANCE.settings.appLocale()
     return WiFiChannelCountry
         .findAll()
         .map { Data(it.countryCode, it.countryName(currentLocale)) }
@@ -35,4 +35,4 @@ private fun data(): List<Data> {
 class CountryPreference(
     context: Context,
     attrs: AttributeSet,
-) : CustomPreference(context, attrs, data(), defaultCountryCode())
+) : CustomPreference(context, attrs, data(), currentCountryCode())

app/src/main/kotlin/com/vrem/wifianalyzer/settings/LanguagePreference.kt

@@ -19,20 +19,25 @@ package com.vrem.wifianalyzer.settings
 
 import android.content.Context
 import android.util.AttributeSet
-import com.vrem.util.defaultLanguageTag
-import com.vrem.util.supportedLanguages
-import com.vrem.util.toCapitalize
-import com.vrem.util.toLanguageTag
+import com.vrem.util.supportedLanguageTags
+import com.vrem.util.titlecaseFirst
+import com.vrem.wifianalyzer.R
 import java.util.Locale
 
-private fun data(): List<Data> =
-    supportedLanguages()
-        .map { map(it) }
-        .sorted()
+private fun data(context: Context): List<Data> {
+    val systemDefault = Data("", context.getString(R.string.system_default))
+    val languages =
+        supportedLanguageTags()
+            .filter { it.isNotEmpty() }
+            .map { tag ->
+                val locale = Locale.forLanguageTag(tag)
+                Data(tag, locale.getDisplayName(locale).titlecaseFirst(locale))
+            }.sortedBy { it.name }
 
-private fun map(it: Locale): Data = Data(toLanguageTag(it), it.getDisplayName(it).toCapitalize(Locale.getDefault()))
+    return listOf(systemDefault) + languages
+}
 
 class LanguagePreference(
     context: Context,
     attrs: AttributeSet,
-) : CustomPreference(context, attrs, data(), defaultLanguageTag())
+) : CustomPreference(context, attrs, data(context), "")