Add support for language switching (#1108)

* Add support for language switching

* Clean and improve code based on feedback

* Remove useless logging

app/src/main/java/com/keylesspalace/tusky/BaseActivity.java

@@ -16,6 +16,7 @@
 package com.keylesspalace.tusky;
 
 import android.app.ActivityManager;
+import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.graphics.Bitmap;
@@ -99,6 +100,11 @@ public abstract class BaseActivity extends AppCompatActivity implements Injectab
         callList = new ArrayList<>();
     }
 
+    @Override
+    protected void attachBaseContext(Context base) {
+        super.attachBaseContext(TuskyApplication.localeManager.setLocale(base));
+    }
+
     protected boolean requiresLogin() {
         return true;
     }

app/src/main/java/com/keylesspalace/tusky/PreferencesActivity.kt

@@ -125,16 +125,9 @@ class PreferencesActivity : BaseActivity(), SharedPreferences.OnSharedPreference
                 val theme = sharedPreferences.getNonNullString("appTheme", ThemeUtils.APP_THEME_DEFAULT)
                 Log.d("activeTheme", theme)
                 ThemeUtils().setAppNightMode(theme, this)
-                restartActivitiesOnExit = true
 
-                // recreate() could be used instead, but it doesn't have an animation B).
+                restartActivitiesOnExit = true
-                intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK
+                this.restartCurrentActivity()
-                val savedInstanceState = Bundle()
-                saveInstanceState(savedInstanceState)
-                intent.putExtras(savedInstanceState)
-                startActivityWithSlideInAnimation(intent)
-                finish()
-                overridePendingTransition(R.anim.fade_in, R.anim.fade_out)
 
                 // MODE_NIGHT_FOLLOW_SYSTEM workaround part 2 :/
                 when(theme){
@@ -143,7 +136,6 @@ class PreferencesActivity : BaseActivity(), SharedPreferences.OnSharedPreference
                     }
                 }
                 //workaround end
-
             }
             "statusTextSize" -> {
                 restartActivitiesOnExit = true
@@ -151,11 +143,24 @@ class PreferencesActivity : BaseActivity(), SharedPreferences.OnSharedPreference
             "absoluteTimeView" -> {
                 restartActivitiesOnExit = true
             }
+            "language" -> {
+                restartActivitiesOnExit = true
+                this.restartCurrentActivity()
+            }
         }
 
         eventHub.dispatch(PreferenceChangedEvent(key))
     }
 
+    private fun restartCurrentActivity() {
+        intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK
+        val savedInstanceState = Bundle()
+        saveInstanceState(savedInstanceState)
+        intent.putExtras(savedInstanceState)
+        startActivityWithSlideInAnimation(intent)
+        finish()
+        overridePendingTransition(R.anim.fade_in, R.anim.fade_out)
+    }
 
     override fun onBackPressed() {
         /* Switching themes won't actually change the theme of activities on the back stack.

app/src/main/java/com/keylesspalace/tusky/TuskyApplication.java

@@ -20,7 +20,10 @@ import android.app.Application;
 import android.app.Service;
 import androidx.room.Room;
 import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.res.Configuration;
 import android.preference.PreferenceManager;
+import android.util.Log;
 import androidx.emoji.text.EmojiCompat;
 
 import com.evernote.android.job.JobManager;
@@ -29,6 +32,7 @@ import com.keylesspalace.tusky.db.AccountManager;
 import com.keylesspalace.tusky.db.AppDatabase;
 import com.keylesspalace.tusky.di.AppInjector;
 import com.keylesspalace.tusky.util.EmojiCompatFont;
+import com.keylesspalace.tusky.util.LocaleManager;
 import com.keylesspalace.tusky.util.NotificationPullJobCreator;
 import com.squareup.picasso.Picasso;
 
@@ -62,6 +66,10 @@ public class TuskyApplication extends Application implements HasActivityInjector
 
     private ServiceLocator serviceLocator;
 
+    public static LocaleManager localeManager;
+
+    private final String TAG = "TuskyApplication";
+
     @Override
     public void onCreate() {
         super.onCreate();
@@ -103,6 +111,18 @@ public class TuskyApplication extends Application implements HasActivityInjector
         Security.insertProviderAt(Conscrypt.newProvider(), 1);
     }
 
+    @Override
+    protected void attachBaseContext(Context base) {
+        localeManager = new LocaleManager(base);
+        super.attachBaseContext(localeManager.setLocale(base));
+    }
+
+    @Override
+    public void onConfigurationChanged(Configuration newConfig) {
+        super.onConfigurationChanged(newConfig);
+        localeManager.setLocale(this);
+    }
+
     /**
      * This method will load the EmojiCompat font which has been selected.
      * If this font does not work or if the user hasn't selected one (yet), it will use a

app/src/main/java/com/keylesspalace/tusky/fragment/preference/PreferencesFragment.kt

@@ -62,6 +62,8 @@ class PreferencesFragment : PreferenceFragmentCompat() {
             true
         }
 
+        val languagePreference: Preference = findPreference("language")
+        languagePreference.icon = IconicsDrawable(languagePreference.context, GoogleMaterial.Icon.gmd_translate).sizePx(iconSize).color(ThemeUtils.getColor(languagePreference.context, R.attr.toolbar_icon_tint))
     }
 
     override fun onResume() {

app/src/main/java/com/keylesspalace/tusky/util/LocaleManager.kt

@@ -0,0 +1,46 @@
+/* Copyright 2019 Mélanie Chauvel (ariasuni)
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.util
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.content.res.Configuration
+import android.content.res.Resources
+import android.preference.PreferenceManager
+
+import java.util.Locale
+
+import com.keylesspalace.tusky.util.getNonNullString
+
+
+class LocaleManager(context: Context) {
+
+    private var prefs: SharedPreferences = PreferenceManager.getDefaultSharedPreferences(context)
+
+    fun setLocale(context: Context): Context {
+        val language = prefs.getNonNullString("language", "default")
+        if (language.equals("default")) {
+            return context;
+        }
+        val locale = Locale.forLanguageTag(language)
+        Locale.setDefault(locale)
+
+        val res = context.getResources()
+        val config = Configuration(res.getConfiguration());
+        config.setLocale(locale)
+        return context.createConfigurationContext(config)
+    }
+}

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

@@ -31,4 +31,65 @@
         <item>auto_system</item>
     </string-array>
 
+    <string-array name="language_entries">
+        <item>@string/system_default</item>
+        <item>Català</item>
+        <item>Cymraeg</item>
+        <item>Deutsch</item>
+        <item>English</item>
+        <item>Español</item>
+        <item>Euskara</item>
+        <item>Français</item>
+        <item>Italiano</item>
+        <item>Magyar</item>
+        <item>Nederlands</item>
+        <item>Occitan</item>
+        <item>Polski</item>
+        <item>Português (Brasil)</item>
+        <item>Svenska</item>
+        <item>Türkçe</item>
+        <item>Русский</item>
+        <item>العَرَبِيَّة‎</item>
+        <item>فارسی</item>
+        <item>தமிழ்</item>
+        <item>한국어</item>
+        <item>中文(台灣)</item>
+        <item>中文(新加坡)</item>
+        <item>中文(澳門)</item>
+        <item>中文(简体)</item>
+        <item>中文(香港)</item>
+        <item>日本語</item>
+    </string-array>
+
+    <string-array name="language_values">
+        <item>default</item>
+        <item>ca</item>
+        <item>cy</item>
+        <item>de</item>
+        <item>en</item>
+        <item>es</item>
+        <item>eu</item>
+        <item>fr</item>
+        <item>it</item>
+        <item>hu</item>
+        <item>nl</item>
+        <item>oc</item>
+        <item>pl</item>
+        <item>pt-BR</item>
+        <item>sv</item>
+        <item>tr</item>
+        <item>ru</item>
+        <item>ar</item>
+        <item>fa</item>
+        <item>ta</item>
+        <item>ko</item>
+        <item>zh-TW</item>
+        <item>zh-SG</item>
+        <item>zh-MO</item>
+        <item>zh-CN</item>
+        <item>zh-HK</item>
+        <item>ja</item>
+    </string-array>
+
+    <string name="pref_title_language_settings">Language</string>
 </resources>

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

@@ -211,6 +211,7 @@
     <string name="pref_title_browser_settings">Browser</string>
     <string name="pref_title_custom_tabs">Use Chrome Custom Tabs</string>
     <string name="pref_title_hide_follow_button">Hide compose button while scrolling</string>
+    <string name="pref_title_language">Language</string>
     <string name="pref_title_status_filter">Timeline filtering</string>
     <string name="pref_title_status_tabs">Tabs</string>
     <string name="pref_title_show_boosts">Show boosts</string>

app/src/main/res/xml/preferences.xml

@@ -21,6 +21,14 @@
             android:icon="@drawable/ic_emoji_24dp"
             android:title="@string/emoji_style" />
 
+        <ListPreference
+            android:defaultValue="default"
+            android:entries="@array/language_entries"
+            android:entryValues="@array/language_values"
+            android:key="language"
+            android:summary="%s"
+            android:title="@string/pref_title_language" />
+
         <ListPreference
             android:defaultValue="medium"
             android:entries="@array/status_text_size_names"