⚙️ Add app language selection setting

A language selection setting is added to the settings page.
The `MainActivity` now extends `AppCompatActivity` to handle changing the
app language. More info on this here:
https://developer.android.com/guide/topics/resources/app-languages#androidx-impl

app/src/main/AndroidManifest.xml

@@ -30,7 +30,7 @@
         android:label="Petals"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@android:style/Theme.Holo.Light.NoActionBar">
+        android:theme="@style/AppTheme">
         <activity
             android:name=".MainActivity"
             android:exported="true">
@@ -62,6 +62,15 @@
                 android:resource="@xml/file_paths" />
         </provider>
 
+		<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/br/com/colman/petals/MainActivity.kt

@@ -19,8 +19,8 @@
 package br.com.colman.petals
 
 import android.os.Bundle
-import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
+import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.padding
@@ -56,7 +56,7 @@ import org.koin.android.ext.android.inject
 import java.time.LocalDateTime
 
 @Suppress("FunctionName")
-class MainActivity : ComponentActivity(), CoroutineScope by CoroutineScope(Dispatchers.Main) {
+class MainActivity : AppCompatActivity(), CoroutineScope by CoroutineScope(Dispatchers.Main) {
 
   private var authorizedUntil = LocalDateTime.MIN
   private val settingsRepository by inject<SettingsRepository>()

app/src/main/kotlin/br/com/colman/petals/settings/AppLanguage.kt

@@ -0,0 +1,25 @@
+package br.com.colman.petals.settings
+
+enum class AppLanguage(val languageName: String, val languageCode: String) {
+  German("Deutsch", "de"),
+  English("English", "en"),
+  French("Français", "fr"),
+  Spanish("Español", "es"),
+  Italian("Italiano", "it"),
+  Dutch("Nederlands", "nl"),
+  Norwegian("Norsk", "no"),
+  Portuguese("Português", "pt"),
+  Russian("Русский", "ru"),
+  Turkish("Türkçe", "tr"),
+  Ukrainian("Українськ", "uk");
+
+  companion object {
+    fun getAppLanguageName(code: String): String {
+      return entries.firstOrNull { it.languageCode == code }?.languageName ?: English.languageName
+    }
+
+    fun getAppLanguageCode(languageName: String): String {
+      return entries.firstOrNull { it.languageName == languageName }?.languageCode ?: English.languageCode
+    }
+  }
+}

app/src/main/kotlin/br/com/colman/petals/settings/SettingsRepository.kt

@@ -29,6 +29,7 @@ class SettingsRepository(
   val isDarkModeEnabled: Flow<Boolean> = datastore.data.map { it[IsDarkModeOn] ?: true }
   val isHitTimerMillisecondsEnabled = datastore.data.map { it[IsHitTimerMillisecondsEnabled] ?: false }
   val isDayExtended = datastore.data.map { it[IsDayExtended] ?: false }
+  val appLanguages = AppLanguage.entries.map { it.languageName }
 
   fun setCurrencyIcon(value: String): Unit = runBlocking {
     datastore.edit { it[CurrencyIcon] = value }

app/src/main/kotlin/br/com/colman/petals/settings/SettingsView.kt

@@ -1,17 +1,20 @@
 package br.com.colman.petals.settings
 
+import androidx.appcompat.app.AppCompatDelegate
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
+import androidx.core.os.LocaleListCompat
 import br.com.colman.petals.settings.view.listitem.ClockListItem
 import br.com.colman.petals.settings.view.listitem.CurrencyListItem
 import br.com.colman.petals.settings.view.listitem.DateListItem
 import br.com.colman.petals.settings.view.listitem.ExtendDayListItem
 import br.com.colman.petals.settings.view.listitem.HitTimerMillisecondsEnabledListItem
+import br.com.colman.petals.settings.view.listitem.LanguageListItem
 import br.com.colman.petals.settings.view.listitem.PinListItem
 import br.com.colman.petals.settings.view.listitem.PrecisionListItem
 import br.com.colman.petals.settings.view.listitem.RepositoryListItem
@@ -29,6 +32,15 @@ fun SettingsView(settingsRepository: SettingsRepository) {
     settingsRepository.decimalPrecisionList[2]
   )
   val currentExtendDay by settingsRepository.isDayExtended.collectAsState(false)
+
+  val setAppLanguage = { language: String ->
+    val languageCode = AppLanguage.getAppLanguageCode(language)
+    if (languageCode.isNotEmpty()) {
+      val appLocale = LocaleListCompat.forLanguageTags(languageCode)
+      AppCompatDelegate.setApplicationLocales(appLocale)
+    }
+  }
+
   Column(Modifier.verticalScroll(rememberScrollState())) {
     CurrencyListItem(currentCurrency, settingsRepository::setCurrencyIcon)
     PinListItem(settingsRepository::setPin)
@@ -41,6 +53,11 @@ fun SettingsView(settingsRepository: SettingsRepository) {
       settingsRepository.decimalPrecisionList,
       settingsRepository::setDecimalPrecision
     )
+    LanguageListItem(
+      AppLanguage.getAppLanguageName(AppCompatDelegate.getApplicationLocales().toLanguageTags()),
+      settingsRepository.appLanguages,
+      setAppLanguage
+    )
     HitTimerMillisecondsEnabledListItem(
       currentHitTimerMillisecondsEnabled,
       settingsRepository::setIsHitTimerMillisecondsEnabled

app/src/main/kotlin/br/com/colman/petals/settings/view/listitem/LanguageListItem.kt

@@ -0,0 +1,41 @@
+package br.com.colman.petals.settings.view.listitem
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.tooling.preview.Preview
+import br.com.colman.petals.R.string.language_label
+import br.com.colman.petals.R.string.what_language_should_be_used
+import br.com.colman.petals.settings.view.dialog.SelectFromListDialog
+import compose.icons.TablerIcons
+import compose.icons.tablericons.Language
+
+@Preview
+@Composable
+fun LanguageListItem(
+  appLanguage: String = "English",
+  appLanguageList: List<String> = listOf(),
+  setAppLanguage: (String) -> Unit = {}
+) {
+  DialogListItem(
+    icon = TablerIcons.Language,
+    textId = language_label,
+    descriptionId = what_language_should_be_used,
+    dialog = { hideDialog -> LanguageDialog(appLanguage, appLanguageList, setAppLanguage, hideDialog) }
+  )
+}
+
+@Preview
+@Composable
+private fun LanguageDialog(
+  initialAppLanguage: String = "",
+  appLanguageList: List<String> = listOf(),
+  setAppLanguage: (String) -> Unit = {},
+  onDismiss: () -> Unit = {},
+) {
+  SelectFromListDialog(
+    initialValue = initialAppLanguage,
+    possibleValues = appLanguageList,
+    setValue = setAppLanguage,
+    onDismiss = onDismiss,
+    label = language_label
+  )
+}

app/src/main/res/values/strings.xml

@@ -175,4 +175,6 @@
         <item quantity="one">Last %s day</item>
         <item quantity="other">Last %s days</item>
     </plurals>
+	<string name="language_label">App language</string>
+	<string name="what_language_should_be_used">What language should be used</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+	<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"/>
+</resources>