[android] Add function to get all android system languages

Signed-off-by: gekeleda <git@davidgekeler.eu>

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

@@ -1,11 +1,16 @@
 package app.organicmaps.sdk.util;
 
 import android.content.Context;
+import android.content.res.Resources;
+import android.os.Build;
+import android.os.LocaleList;
 import android.text.TextUtils;
 import android.view.inputmethod.InputMethodManager;
 import android.view.inputmethod.InputMethodSubtype;
 import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Locale;
 
 public class Language
@@ -33,6 +38,36 @@ public class Language
     return lang;
   }
 
+  @Keep
+  @SuppressWarnings("unused")
+  @NonNull
+  public static String[] getSystemLocales()
+  {
+    List<String> result = new ArrayList<>();
+
+    // Check for Android version high enough to support Locale Preference list
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
+    {
+      // Gets user language preference list, on system level - app-specific changes are not applied
+      // (For that a Context object would be necessary)
+      LocaleList list = Resources.getSystem().getConfiguration().getLocales();
+      for (int i = 0; i < list.size(); i++)
+      {
+        String lang = list.get(i).toString();
+        if (lang.startsWith("in"))
+          lang = "id";
+        if (lang.startsWith("iw"))
+          lang = "he";
+        result.add(lang);
+      }
+    }
+    else
+    {
+      result.add(Locale.getDefault().toString());
+    }
+    return result.toArray(new String[0]);
+  }
+
   // After some testing on Galaxy S4, looks like this method doesn't work on all devices:
   // sometime it always returns the same value as getDefaultLocale()
   @NonNull