Implement language switcher

- Add language switcher to demo internationalization in the sdc lib
- Vietnamese localization

datacapturegallery/src/main/java/com/google/android/fhir/datacapture/gallery/MainActivity.kt

@@ -16,15 +16,111 @@
 
 package com.google.android.fhir.datacapture.gallery
 
+import android.app.Activity
+import android.content.Context
+import android.content.res.Configuration
 import android.os.Bundle
+import android.view.MenuItem
+import android.view.View
+import androidx.appcompat.app.ActionBarDrawerToggle
 import androidx.appcompat.app.AppCompatActivity
 import com.google.android.fhir.datacapture.gallery.databinding.ActivityMainBinding
+import com.google.android.fhir.datacapture.gallery.utils.LanguageSwitcherUtils
+import com.google.android.material.navigation.NavigationView
+import java.util.Locale
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener {
   private lateinit var binding: ActivityMainBinding
+  private lateinit var drawerToggle: ActionBarDrawerToggle
+  private lateinit var languageList: List<LanguageSwitcherUtils.Language>
+
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     binding = ActivityMainBinding.inflate(layoutInflater)
     setContentView(binding.root)
+
+    languageList = LanguageSwitcherUtils.getLanguageList(this)
+
+    setUpNavigationView()
+  }
+
+  private fun refreshToSelectedLanguage(
+    language: LanguageSwitcherUtils.Language,
+    context: Activity
+  ) {
+
+    getNavigationView().menu.findItem(R.id.switch_language).title = language.displayName
+
+    val sharedPref =
+      context?.getSharedPreferences(
+        BuildConfig.APPLICATION_ID.plus(this.javaClass.canonicalName),
+        Context.MODE_PRIVATE
+      )
+        ?: return
+    with(sharedPref.edit()) {
+      putString(LanguageSwitcherUtils.SHARED_PREF_KEY_LANG, language.tag)
+      commit()
+    }
+
+    LanguageSwitcherUtils.refreshActivity(context)
+  }
+
+  override fun attachBaseContext(base: Context) {
+    val sharedPref =
+      base?.getSharedPreferences(
+        BuildConfig.APPLICATION_ID.plus(this.javaClass.canonicalName),
+        Context.MODE_PRIVATE
+      )
+        ?: return
+    val languageTag =
+      sharedPref.getString(
+        LanguageSwitcherUtils.SHARED_PREF_KEY_LANG,
+        Locale.getDefault().toLanguageTag()
+      )
+    val newConfiguration: Configuration? = LanguageSwitcherUtils.setAppLocale(base, languageTag)
+    super.attachBaseContext(base)
+    applyOverrideConfiguration(newConfiguration)
   }
+
+  override fun onNavigationItemSelected(item: MenuItem): Boolean {
+    when (item.itemId) {
+      R.id.switch_language ->
+        LanguageSwitcherUtils.renderSelectLanguageDialog(this, languageList) { _, i ->
+          refreshToSelectedLanguage(languageList[i], this)
+        }
+      else -> false
+    }
+
+    return true
+  }
+
+  override fun onOptionsItemSelected(item: MenuItem): Boolean {
+
+    if (drawerToggle.onOptionsItemSelected(item)) {
+      return true
+    }
+    return super.onOptionsItemSelected(item)
+  }
+
+  private fun setUpNavigationView() {
+
+    drawerToggle =
+      ActionBarDrawerToggle(
+        this,
+        binding.drawerLayout,
+        R.string.nav_app_bar_open_drawer_description,
+        R.string.nav_app_bar_navigate_up_description
+      )
+    binding.drawerLayout.addDrawerListener(drawerToggle)
+    drawerToggle.syncState()
+
+    supportActionBar?.setDisplayHomeAsUpEnabled(true)
+
+    val navigationView = getNavigationView()
+    navigationView.setNavigationItemSelectedListener(this)
+
+    navigationView.menu.findItem(R.id.switch_language).title = Locale.getDefault().displayName
+  }
+
+  private fun getNavigationView() = findViewById<View>(R.id.nav_view) as NavigationView
 }

datacapturegallery/src/main/java/com/google/android/fhir/datacapture/gallery/utils/LanguageSwitcherUtils.kt

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.fhir.datacapture.gallery.utils
+
+import android.app.Activity
+import android.content.Context
+import android.content.DialogInterface
+import android.content.Intent
+import android.content.res.Configuration
+import android.content.res.Resources
+import android.os.Build
+import android.os.LocaleList
+import android.widget.ArrayAdapter
+import androidx.appcompat.app.AlertDialog
+import com.google.android.fhir.datacapture.gallery.R
+import java.util.Locale
+
+object LanguageSwitcherUtils {
+
+  const val SHARED_PREF_KEY_LANG = "shared_pref_key_lang"
+
+  fun setAppLocale(context: Context, language: String?): Configuration? {
+    val res: Resources = context.resources
+    val configuration: Configuration = res.configuration
+    try {
+      val locale = Locale.forLanguageTag(language)
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+        configuration.setLocale(locale)
+        val localeList = LocaleList(locale)
+        LocaleList.setDefault(localeList)
+        configuration.setLocales(localeList)
+        context.createConfigurationContext(configuration)
+      } else {
+        configuration.locale = locale
+        res.updateConfiguration(configuration, res.displayMetrics)
+      }
+    } catch (e: Exception) {
+      e.printStackTrace()
+    }
+    return configuration
+  }
+
+  fun getLanguageList(activity: Activity): List<Language> {
+    return activity.resources.getStringArray(R.array.languages).toList().map {
+      Language(it, Locale.forLanguageTag(it).displayName)
+    }
+  }
+
+  fun refreshActivity(activity: Activity) {
+    val intent = Intent(activity, activity.javaClass)
+    activity.startActivity(intent)
+  }
+
+  fun renderSelectLanguageDialog(
+    context: Activity,
+    languageList: List<Language>,
+    listener: DialogInterface.OnClickListener
+  ) {
+
+    val adapter: ArrayAdapter<Language> =
+      ArrayAdapter(context, android.R.layout.simple_list_item_1, languageList)
+
+    val builder: AlertDialog.Builder = AlertDialog.Builder(context)
+    builder.setTitle(context.getString(R.string.select_language))
+    builder.setIcon(R.drawable.outline_language_24)
+    builder.setAdapter(adapter, listener).create().show()
+  }
+  data class Language(val tag: String, val displayName: String) {
+    override fun toString() = displayName
+  }
+}

datacapturegallery/src/main/res/drawable-v24/outline_language_24.xml

@@ -0,0 +1,13 @@
+<vector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal"
+>
+  <path
+        android:fillColor="@android:color/white"
+        android:pathData="M11.99,2C6.47,2 2,6.48 2,12s4.47,10 9.99,10C17.52,22 22,17.52 22,12S17.52,2 11.99,2zM18.92,8h-2.95c-0.32,-1.25 -0.78,-2.45 -1.38,-3.56 1.84,0.63 3.37,1.91 4.33,3.56zM12,4.04c0.83,1.2 1.48,2.53 1.91,3.96h-3.82c0.43,-1.43 1.08,-2.76 1.91,-3.96zM4.26,14C4.1,13.36 4,12.69 4,12s0.1,-1.36 0.26,-2h3.38c-0.08,0.66 -0.14,1.32 -0.14,2s0.06,1.34 0.14,2L4.26,14zM5.08,16h2.95c0.32,1.25 0.78,2.45 1.38,3.56 -1.84,-0.63 -3.37,-1.9 -4.33,-3.56zM8.03,8L5.08,8c0.96,-1.66 2.49,-2.93 4.33,-3.56C8.81,5.55 8.35,6.75 8.03,8zM12,19.96c-0.83,-1.2 -1.48,-2.53 -1.91,-3.96h3.82c-0.43,1.43 -1.08,2.76 -1.91,3.96zM14.34,14L9.66,14c-0.09,-0.66 -0.16,-1.32 -0.16,-2s0.07,-1.35 0.16,-2h4.68c0.09,0.65 0.16,1.32 0.16,2s-0.07,1.34 -0.16,2zM14.59,19.56c0.6,-1.11 1.06,-2.31 1.38,-3.56h2.95c-0.96,1.65 -2.49,2.93 -4.33,3.56zM16.36,14c0.08,-0.66 0.14,-1.32 0.14,-2s-0.06,-1.34 -0.14,-2h3.38c0.16,0.64 0.26,1.31 0.26,2s-0.1,1.36 -0.26,2h-3.38z"
+    />
+</vector>

datacapturegallery/src/main/res/layout/activity_main.xml

@@ -14,20 +14,34 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<androidx.constraintlayout.widget.ConstraintLayout
+<androidx.drawerlayout.widget.DrawerLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/drawer_layout"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:fitsSystemWindows="true"
     tools:context=".MainActivity"
 >
+
     <androidx.fragment.app.FragmentContainerView
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
         android:id="@+id/nav_host_fragment"
         android:name="androidx.navigation.fragment.NavHostFragment"
-        app:navGraph="@navigation/main_nav_graph"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
         app:defaultNavHost="true"
+        app:navGraph="@navigation/main_nav_graph"
     />
-</androidx.constraintlayout.widget.ConstraintLayout>
+
+    <com.google.android.material.navigation.NavigationView
+        android:id="@+id/nav_view"
+        android:layout_width="wrap_content"
+        android:layout_height="match_parent"
+        android:layout_gravity="start"
+        android:fitsSystemWindows="true"
+        app:headerLayout="@layout/nav_header"
+        app:menu="@menu/nav_drawer_menu"
+    />
+
+</androidx.drawerlayout.widget.DrawerLayout>

datacapturegallery/src/main/res/layout/nav_header.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="160dp"
+    android:background="@color/purple_700"
+>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

datacapturegallery/src/main/res/menu/nav_drawer_menu.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item
+        android:id="@+id/switch_language"
+        android:title="Language"
+        android:icon="@drawable/outline_language_24"
+    />
+</menu>

datacapturegallery/src/main/res/values-vi/strings.xml

@@ -0,0 +1,20 @@
+<!--
+ Copyright 2020 Google LLC
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+<resources>
+    <string name="app_name">Thư viện thu thập dữ liệu</string>
+    <string name="submit_button_text">Gửi</string>
+    <string name="select_language">Chọn ngôn ngữ</string>
+</resources>

datacapturegallery/src/main/res/values/languages.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<resources>
+    <string-array name="languages">
+        <item>en</item>
+        <item>vi-VN</item>
+    </string-array>
+</resources>

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

@@ -16,4 +16,5 @@
 <resources>
     <string name="app_name">Data Capture Gallery</string>
     <string name="submit_button_text">Submit</string>
+    <string name="select_language">Select Language</string>
 </resources>