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Add LanguageHelper & language picker
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‎app/README.md‎

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2. [DownloadManager](https://github.com/AsemLab/Samples/blob/main/app/src/main/java/com/asemlab/samples/download/FileDownloaderImp.kt): is a system service that handles long-running HTTP downloads. Clients may request that a URI be downloaded to a particular destination file. [Official](https://developer.android.com/reference/android/app/DownloadManager)
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3. [Epoxy](https://github.com/AsemLab/Samples/blob/main/app/src/main/java/com/asemlab/samples/epoxy/EpoxyActivity.kt): is an Android library for building complex screens in a RecyclerView. [Official](https://github.com/airbnb/epoxy)
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4. [Pass data between components](https://github.com/AsemLab/Samples/tree/main/app/src/main/java/com/asemlab/samples/passdata): demonstrate how to pass data from Activity to Activity/Fragment and from Fragment to Activity/Fragment.
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5. [Photo Picker](https://github.com/AsemLab/Samples/blob/main/app/src/main/java/com/asemlab/samples/ui/RegisterForResultActivity.kt): provides a browsable interface that presents the user with their media library, sorted by date from newest to oldest. [Official](https://developer.android.com/training/data-storage/shared/photopicker)
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6. [Progress in Notifications](https://github.com/AsemLab/Samples/blob/main/app/src/main/java/com/asemlab/samples/ui/NotificationProgressActivity.kt): display and update progressBar in notification.
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7. [RegisterForActivityResult](https://github.com/AsemLab/Samples/blob/main/app/src/main/java/com/asemlab/samples/ui/RegisterForResultActivity.kt): call an activity and retrieve the result from it. [Official](https://developer.android.com/training/basics/intents/result)
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5. [Per-app language preferences](https://github.com/AsemLab/Samples/blob/main/app/src/main/java/com/asemlab/samples/utils/LanguageHelper.kt): allow users to set their preferred language for each app. The app specific preferred language will override the system language for that particular application. [Official](https://developer.android.com/guide/topics/resources/app-languages)
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6. [Photo Picker](https://github.com/AsemLab/Samples/blob/main/app/src/main/java/com/asemlab/samples/ui/RegisterForResultActivity.kt): provides a browsable interface that presents the user with their media library, sorted by date from newest to oldest. [Official](https://developer.android.com/training/data-storage/shared/photopicker)
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7. [Progress in Notifications](https://github.com/AsemLab/Samples/blob/main/app/src/main/java/com/asemlab/samples/ui/NotificationProgressActivity.kt): display and update progressBar in notification.
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8. [RegisterForActivityResult](https://github.com/AsemLab/Samples/blob/main/app/src/main/java/com/asemlab/samples/ui/RegisterForResultActivity.kt): call an activity and retrieve the result from it. [Official](https://developer.android.com/training/basics/intents/result)

‎app/src/main/java/com/asemlab/samples/ui/MainActivity.kt‎

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package com.asemlab.samples.ui
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import android.Manifest
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import android.app.LocaleConfig
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import android.app.LocaleManager
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import android.content.pm.PackageManager
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import android.os.Build
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import android.os.Bundle
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import android.os.LocaleList
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import android.view.View
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import androidx.annotation.RequiresApi
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import androidx.appcompat.app.AppCompatActivity
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true
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)
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
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// TODO Set per-app supported languages dynamically
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updateSupportedLocales()
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}
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}
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fun selectFragment(view: View) {
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fragmentTransaction.commit()
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}
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@RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
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fun updateSupportedLocales() {
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val localeManager = applicationContext
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.getSystemService(LocaleManager::class.java)
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// For getOverrideLocaleConfig
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val overrideLocaleConfig = localeManager.overrideLocaleConfig
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val supportedLocales = overrideLocaleConfig?.supportedLocales
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// For setOverrideLocaleConfig, update supported and remove old ones
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localeManager.overrideLocaleConfig = LocaleConfig(
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LocaleList.forLanguageTags("en-US,ja-JP,ar")
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)
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}
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}

‎app/src/main/java/com/asemlab/samples/utils/LanguageHelper.kt‎

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package com.asemlab.samples.utils
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import android.app.LocaleConfig
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import android.app.LocaleManager
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import android.content.Context
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import android.os.Build
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import android.os.LocaleList
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import androidx.annotation.RequiresApi
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import androidx.appcompat.app.AlertDialog
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import androidx.appcompat.app.AppCompatDelegate
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import androidx.core.os.LocaleListCompat
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import com.asemlab.samples.R
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object LanguageHelper {
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// TODO Set per-app supported languages dynamically
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@RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
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fun updateSupportedLocales(context: Context) {
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val localeManager = context
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.getSystemService(LocaleManager::class.java)
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// For getOverrideLocaleConfig
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val overrideLocaleConfig = localeManager.overrideLocaleConfig
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val supportedLocales = overrideLocaleConfig?.supportedLocales
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// For setOverrideLocaleConfig, update supported and remove old ones
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localeManager.overrideLocaleConfig = LocaleConfig(
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LocaleList.forLanguageTags("en-US,ar")
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)
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}
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// TODO Use AndroidX to change locale
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fun showPickerDialog(context: Context) {
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var selectedLocale = AppCompatDelegate.getApplicationLocales()[0]?.language ?: "en"
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val selectedItem =
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context.resources.getStringArray(R.array.language_codes).indexOf(selectedLocale)
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AlertDialog.Builder(context)
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.setTitle("Choose your language")
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.setSingleChoiceItems(R.array.languages, selectedItem) { _, which ->
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when (which) {
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0 -> selectedLocale = "en"
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1 -> selectedLocale = "ar"
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2 -> selectedLocale = "de"
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}
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}
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.setNegativeButton("Close") { d, _ ->
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d.dismiss()
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}
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.setPositiveButton("Apply") { d, _ ->
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val appLocale: LocaleListCompat = LocaleListCompat.forLanguageTags(selectedLocale)
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// Call this on the main thread as it may require Activity.restart()
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AppCompatDelegate.setApplicationLocales(appLocale)
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d.dismiss()
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}
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.show()
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}
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}

‎app/src/main/res/values/strings.xml‎

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<resources>
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<string name="app_name" translatable="false">ContactsContent</string>
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<string name="language_title">English</string>
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<string-array name="languages" translatable="false">
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<item>English</item>
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<item>العربية</item>
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<item>Deutsch</item>
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</string-array>
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<string-array name="language_codes" translatable="false">
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<item>en</item>
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<item>ar</item>
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<item>de</item>
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</string-array>
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</resources>

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