Implement language switcher (#344)

* Implement language switcher

* Use unique string resource to enumerate translated locale

app/src/main/java/com/m2049r/xmrwallet/LoginActivity.java

@@ -52,6 +52,7 @@ import com.m2049r.xmrwallet.model.WalletManager;
 import com.m2049r.xmrwallet.service.WalletService;
 import com.m2049r.xmrwallet.util.Helper;
 import com.m2049r.xmrwallet.util.KeyStoreHelper;
+import com.m2049r.xmrwallet.util.LocaleHelper;
 import com.m2049r.xmrwallet.util.MoneroThreadPoolExecutor;
 import com.m2049r.xmrwallet.widget.Toolbar;
 
@@ -62,7 +63,12 @@ import java.io.IOException;
 import java.net.Socket;
 import java.net.SocketAddress;
 import java.nio.channels.FileChannel;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
 import java.util.Date;
+import java.util.Locale;
 
 import timber.log.Timber;
 
@@ -959,6 +965,48 @@ public class LoginActivity extends SecureActivity
         }
     }
 
+    public void onChangeLocale() {
+        final ArrayList<Locale> translatedLocales = LocaleHelper.getAvailableLocales(LoginActivity.this);
+        String[] localeDisplayName = new String[1 + translatedLocales.size()];
+
+        Collections.sort(translatedLocales, new Comparator<Locale>() {
+            @Override
+            public int compare(Locale locale1, Locale locale2) {
+                String localeString1 = LocaleHelper.getLocaleString(LoginActivity.this, locale1, LocaleHelper.COMPARED_RESOURCE_ID);
+                String localeString2 = LocaleHelper.getLocaleString(LoginActivity.this, locale2, LocaleHelper.COMPARED_RESOURCE_ID);
+                return localeString1.compareTo(localeString2);
+            }
+        });
+
+        localeDisplayName[0] = getString(R.string.language_system_default);
+        for (int i = 1; i < localeDisplayName.length; i++) {
+            Locale locale = translatedLocales.get(i - 1);
+            localeDisplayName[i] = LocaleHelper.getLocaleString(LoginActivity.this, locale, LocaleHelper.COMPARED_RESOURCE_ID);
+        }
+
+        int currentLocaleIndex = 0;
+        String currentLocaleName = LocaleHelper.getLocale(LoginActivity.this);
+        if (!currentLocaleName.isEmpty()) {
+            Locale currentLocale = Locale.forLanguageTag(currentLocaleName);
+            String currentLocalizedString = LocaleHelper.getLocaleString(LoginActivity.this, currentLocale, LocaleHelper.COMPARED_RESOURCE_ID);
+            currentLocaleIndex = Arrays.asList(localeDisplayName).indexOf(currentLocalizedString);
+        }
+
+        AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
+        builder.setTitle(getString(R.string.menu_language));
+        builder.setSingleChoiceItems(localeDisplayName, currentLocaleIndex, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int i) {
+                dialog.dismiss();
+
+                LocaleHelper.setLocale(LoginActivity.this,
+                        (i == 0) ? "" : translatedLocales.get(i - 1).toLanguageTag());
+                startActivity(getIntent().addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK));
+            }
+        });
+        builder.show();
+    }
+
     @Override
     public void onBackPressed() {
         Fragment f = getSupportFragmentManager().findFragmentById(R.id.fragment_container);
@@ -1007,6 +1055,9 @@ public class LoginActivity extends SecureActivity
             case R.id.action_privacy_policy:
                 PrivacyFragment.display(getSupportFragmentManager());
                 return true;
+            case R.id.action_language:
+                onChangeLocale();
+                return true;
             case R.id.action_stagenet:
                 try {
                     LoginFragment loginFragment = (LoginFragment)

app/src/main/java/com/m2049r/xmrwallet/SecureActivity.java

@@ -16,13 +16,12 @@
 
 package com.m2049r.xmrwallet;
 
+import android.content.Context;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.v7.app.AppCompatActivity;
 
-import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.LocaleHelper;
-
-import java.io.File;
 
 import static android.view.WindowManager.LayoutParams;
 
@@ -36,4 +35,9 @@ public abstract class SecureActivity extends AppCompatActivity {
             getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE);
         }
     }
+
+    @Override
+    protected void attachBaseContext(Context context) {
+        super.attachBaseContext(LocaleHelper.setLocale(context, LocaleHelper.getLocale(context)));
+    }
 }

app/src/main/java/com/m2049r/xmrwallet/XmrWalletApplication.java

@@ -18,8 +18,10 @@ package com.m2049r.xmrwallet;
 
 
 import android.app.Application;
+import android.content.Context;
+import android.content.res.Configuration;
 
-import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.LocaleHelper;
 
 import timber.log.Timber;
 
@@ -27,9 +29,21 @@ public class XmrWalletApplication extends Application {
     @Override
     public void onCreate() {
         super.onCreate();
-        
+
         if (BuildConfig.DEBUG) {
             Timber.plant(new Timber.DebugTree());
         }
     }
+
+    @Override
+    protected void attachBaseContext(Context context) {
+        super.attachBaseContext(LocaleHelper.setLocale(context, LocaleHelper.getLocale(context)));
+    }
+
+    @Override
+    public void onConfigurationChanged(Configuration configuration) {
+        super.onConfigurationChanged(configuration);
+        LocaleHelper.updateSystemDefaultLocale(configuration.locale);
+        LocaleHelper.setLocale(XmrWalletApplication.this, LocaleHelper.getLocale(XmrWalletApplication.this));
+    }
 }

app/src/main/java/com/m2049r/xmrwallet/service/WalletService.java

@@ -19,6 +19,7 @@ package com.m2049r.xmrwallet.service;
 import android.app.Notification;
 import android.app.PendingIntent;
 import android.app.Service;
+import android.content.Context;
 import android.content.Intent;
 import android.os.Binder;
 import android.os.Bundle;
@@ -36,6 +37,7 @@ import com.m2049r.xmrwallet.model.Wallet;
 import com.m2049r.xmrwallet.model.WalletListener;
 import com.m2049r.xmrwallet.model.WalletManager;
 import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.LocaleHelper;
 
 import timber.log.Timber;
 
@@ -418,6 +420,11 @@ public class WalletService extends Service {
         }
     }
 
+    @Override
+    protected void attachBaseContext(Context context) {
+        super.attachBaseContext(LocaleHelper.setLocale(context, LocaleHelper.getLocale(context)));
+    }
+
     public class WalletServiceBinder extends Binder {
         public WalletService getService() {
             return WalletService.this;

app/src/main/java/com/m2049r/xmrwallet/util/LocaleHelper.java

@@ -0,0 +1,74 @@
+package com.m2049r.xmrwallet.util;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.content.res.Configuration;
+import android.preference.PreferenceManager;
+
+import com.m2049r.xmrwallet.R;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Locale;
+
+public class LocaleHelper {
+    public static final int COMPARED_RESOURCE_ID = R.string.language;
+
+    private static final String PREFERRED_LOCALE_KEY = "preferred_locale";
+    private static Locale SYSTEM_DEFAULT_LOCALE = Locale.getDefault();
+
+    public static ArrayList<Locale> getAvailableLocales(Context context) {
+        ArrayList<Locale> locales = new ArrayList<>();
+        HashSet<String> localizedStrings = new HashSet<>();
+
+        for (String localeName : context.getAssets().getLocales()) {
+            Locale locale = Locale.forLanguageTag(localeName);
+            String localizedString = getLocaleString(context, locale, COMPARED_RESOURCE_ID);
+
+            if (localizedStrings.add(localizedString)) {
+                locales.add(locale);
+            }
+        }
+
+        return locales;
+    }
+
+    public static String getLocale(Context context) {
+        return getPreferredLocale(context);
+    }
+
+    public static Context setLocale(Context context, String locale) {
+        setPreferredLocale(context, locale);
+
+        Locale newLocale = (locale.isEmpty()) ? SYSTEM_DEFAULT_LOCALE : Locale.forLanguageTag(locale);
+        Configuration configuration = context.getResources().getConfiguration();
+
+        Locale.setDefault(newLocale);
+
+        configuration.setLocale(newLocale);
+        configuration.setLayoutDirection(newLocale);
+
+        return context.createConfigurationContext(configuration);
+    }
+
+    public static void updateSystemDefaultLocale(Locale locale) {
+        SYSTEM_DEFAULT_LOCALE = locale;
+    }
+
+    public static String getLocaleString(Context context, Locale locale, int resId) {
+        Configuration configuration = context.getResources().getConfiguration();
+        configuration.setLocale(locale);
+        return context.createConfigurationContext(configuration).getString(resId);
+    }
+
+    private static String getPreferredLocale(Context context) {
+        return PreferenceManager.getDefaultSharedPreferences(context)
+                .getString(PREFERRED_LOCALE_KEY, "");
+    }
+
+    @SuppressLint("ApplySharedPref")
+    private static void setPreferredLocale(Context context, String locale) {
+        PreferenceManager.getDefaultSharedPreferences(context).edit()
+                .putString(PREFERRED_LOCALE_KEY, locale).commit();
+    }
+}

app/src/main/res/menu/list_menu.xml

@@ -10,21 +10,27 @@
         app:showAsAction="never" />
 
     <item
-        android:id="@+id/action_license_info"
+        android:id="@+id/action_language"
         android:orderInCategory="200"
+        android:title="@string/menu_language"
+        app:showAsAction="never" />
+
+    <item
+        android:id="@+id/action_license_info"
+        android:orderInCategory="300"
         android:title="@string/menu_about"
         app:showAsAction="never" />
 
     <item
         android:id="@+id/action_privacy_policy"
-        android:orderInCategory="300"
+        android:orderInCategory="400"
         android:title="@string/menu_privacy"
         app:showAsAction="never" />
 
     <item
         android:id="@+id/action_help_list"
         android:icon="@drawable/ic_help_white_24dp"
-        android:orderInCategory="400"
+        android:orderInCategory="500"
         android:title="@string/menu_help"
         app:showAsAction="ifRoom" />
 

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

@@ -318,4 +318,8 @@
     <string name="send_sweepall">Versende ALLE(!) verfügbaren Gelder aus diesem Konto</string>
     <string name="tx_subaddress">Subadresse #%1$d</string>
     <string name="generate_address_label_sub">Öffentliche Subadresse #%1$d</string>
+
+    <string name="language">Deutsch</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -317,4 +317,8 @@
     <string name="send_sweepall">Send all confirmed funds in this account!</string>
     <string name="tx_subaddress">Subaddress #%1$d</string>
     <string name="generate_address_label_sub">Public Subaddress #%1$d</string>
+
+    <string name="language">Ελληνικά</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -303,4 +303,8 @@
     <string name="send_sweepall">Send all confirmed funds in this account!</string>
     <string name="tx_subaddress">Subaddress #%1$d</string>
     <string name="generate_address_label_sub">Public Subaddress #%1$d</string>
+
+    <string name="language">Español</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -321,4 +321,8 @@
     <string name="send_sweepall">Send all confirmed funds in this account!</string>
     <string name="tx_subaddress">Subaddress #%1$d</string>
     <string name="generate_address_label_sub">Public Subaddress #%1$d</string>
+
+    <string name="language">Français</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -319,4 +319,8 @@
     <string name="send_sweepall">Teljes megerősített egyenleg küldése!</string>
     <string name="tx_subaddress">Alcím #%1$d</string>
     <string name="generate_address_label_sub">Nyilvános alcím #%1$d</string>
+
+    <string name="language">Magyar</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -319,4 +319,8 @@
     <string name="send_sweepall">Manda tutti i fondi confermati in questo account!</string>
     <string name="tx_subaddress">Subaddress #%1$d</string>
     <string name="generate_address_label_sub">Subaddress pubblico #%1$d</string>
+
+    <string name="language">Italiano</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -317,4 +317,8 @@
     <string name="send_sweepall">Send all confirmed funds in this account!</string>
     <string name="tx_subaddress">Subaddress #%1$d</string>
     <string name="generate_address_label_sub">Public Subaddress #%1$d</string>
+
+    <string name="language">Norsk bokmål</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -321,4 +321,8 @@
     <string name="send_sweepall">Send all confirmed funds in this account!</string>
     <string name="tx_subaddress">Subaddress #%1$d</string>
     <string name="generate_address_label_sub">Public Subaddress #%1$d</string>
+
+    <string name="language">Português</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -317,4 +317,8 @@
     <string name="send_sweepall">Send all confirmed funds in this account!</string>
     <string name="tx_subaddress">Subaddress #%1$d</string>
     <string name="generate_address_label_sub">Public Subaddress #%1$d</string>
+
+    <string name="language">Română</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -320,4 +320,8 @@
     <string name="send_sweepall">Отправить все средства на этот счет!</string>
     <string name="tx_subaddress">Субадрес #%1$d</string>
     <string name="generate_address_label_sub">Публичный субадрес #%1$d</string>
+
+    <string name="language">Русский</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

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

@@ -302,4 +302,8 @@
     <string name="send_sweepall">Send all confirmed funds in this account!</string>
     <string name="tx_subaddress">Subaddress #%1$d</string>
     <string name="generate_address_label_sub">Public Subaddress #%1$d</string>
+
+    <string name="language">Svenska</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>

app/src/main/res/values-zh-rCN/strings.xml

@@ -315,4 +315,8 @@
     <string name="send_sweepall">发送这个户口的所有已确认款项！</string>
     <string name="tx_subaddress">附属地址 #%1$d</string>
     <string name="generate_address_label_sub">附属公开地址 #%1$d</string>
+
+    <string name="language">中文（中国）</string>
+    <string name="menu_language">语言</string>
+    <string name="language_system_default">使用系统语言</string>
 </resources>

app/src/main/res/values-zh-rTW/strings.xml

@@ -308,12 +308,16 @@
     <string name="fab_restore_key">從私鑰回復錢包</string>
     <string name="fab_restore_seed">從25字種子碼回復錢包</string>
 
-    <string name="accounts_drawer_new">開新戶口</string>
+    <string name="accounts_drawer_new">新增帳戶</string>
-    <string name="accounts_drawer_title">戶口</string>
+    <string name="accounts_drawer_title">帳戶</string>
-    <string name="accounts_new">已新增戶口 #%1$d</string>
+    <string name="accounts_new">已新增帳戶 #%1$d</string>
-    <string name="tx_account">戶口 #</string>
+    <string name="tx_account">帳戶 #</string>
 
-    <string name="send_sweepall">發送這個戶口的所有已確認款項！</string>
+    <string name="send_sweepall">發送這個帳戶的所有已確認款項！</string>
-    <string name="tx_subaddress">附屬地址 #%1$d</string>
+    <string name="tx_subaddress">子地址 #%1$d</string>
-    <string name="generate_address_label_sub">附屬公開地址 #%1$d</string>
+    <string name="generate_address_label_sub">公開子地址 #%1$d</string>
+
+    <string name="language">中文（台灣）</string>
+    <string name="menu_language">語言</string>
+    <string name="language_system_default">使用系統語言</string>
 </resources>

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

@@ -365,4 +365,8 @@
     <string name="send_sweepall">Send all confirmed funds in this account!</string>
     <string name="tx_subaddress">Subaddress #%1$d</string>
     <string name="generate_address_label_sub">Public Subaddress #%1$d</string>
+
+    <string name="language">English</string>
+    <string name="menu_language">Language</string>
+    <string name="language_system_default">Use System Language</string>
 </resources>