[android] Enable init and detection change of system locale

Signed-off-by: Gonzalo Pesquero <gpesquero@yahoo.es>

android/app/src/main/cpp/app/organicmaps/util/Language.cpp

@@ -1,4 +1,5 @@
 #include "android/app/src/main/cpp/app/organicmaps/core/jni_helper.hpp"
+#include "platform/measurement_utils.hpp"
 #include "platform/preferred_languages.hpp"
 
 extern "C"
@@ -9,4 +10,10 @@ Java_app_organicmaps_util_Language_nativeNormalize(JNIEnv *env, jclass type, jst
   std::string locale = languages::Normalize(jni::ToNativeString(env, lang));
   return jni::ToJavaString(env, locale);
 }
+
+JNIEXPORT void JNICALL
+Java_app_organicmaps_util_Language_nativeRefreshSystemLocale(JNIEnv *, jclass)
+{
+  measurement_utils::RefreshSystemLocale();
+}
 }

android/app/src/main/java/app/organicmaps/MwmApplication.java

@@ -4,7 +4,10 @@ import static app.organicmaps.location.LocationState.LOCATION_TAG;
 
 import android.app.Activity;
 import android.app.Application;
+import android.content.BroadcastReceiver;
 import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.os.Handler;
@@ -41,6 +44,7 @@ import app.organicmaps.settings.StoragePathManager;
 import app.organicmaps.sound.TtsPlayer;
 import app.organicmaps.util.Config;
 import app.organicmaps.util.ConnectionState;
+import app.organicmaps.util.Language;
 import app.organicmaps.util.SharedPropertiesUtils;
 import app.organicmaps.util.StorageUtils;
 import app.organicmaps.util.ThemeSwitcher;
@@ -89,6 +93,8 @@ public class MwmApplication extends Application implements Application.ActivityL
   @Nullable
   private WeakReference<Activity> mTopActivity;
 
+  private BroadcastReceiver mLocaleChangeReceiver;
+
   @UiThread
   @Nullable
   public Activity getTopActivity()
@@ -213,6 +219,22 @@ public class MwmApplication extends Application implements Application.ActivityL
     Config.setStoragePath(writablePath);
     Config.setStatisticsEnabled(SharedPropertiesUtils.isStatisticsEnabled(this));
 
+    // Force native system locale initialization at app start-up.
+    Language.nativeRefreshSystemLocale();
+
+    // Setup BroadcastReceiver to receive changes of system locale.
+    mLocaleChangeReceiver = new BroadcastReceiver()
+    {
+      @Override
+      public void onReceive(Context context, Intent intent)
+      {
+        // Refresh the native c++ system locale.
+        Language.nativeRefreshSystemLocale();
+      }
+    };
+
+    registerReceiver(mLocaleChangeReceiver, new IntentFilter(Intent.ACTION_LOCALE_CHANGED));
+
     mPlatformInitialized = true;
     Logger.i(TAG, "Platform initialized");
   }

android/app/src/main/java/app/organicmaps/util/Language.java

@@ -58,4 +58,7 @@ public class Language
 
   @NonNull
   public static native String nativeNormalize(@NonNull String locale);
+
+  @NonNull
+  public static native void nativeRefreshSystemLocale();
 }