Refactoring

app/src/main/java/eu/faircode/email/Helper.java

@@ -111,6 +111,7 @@ import java.text.DateFormat;
 import java.text.DecimalFormat;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Comparator;
 import java.util.Date;
 import java.util.List;
@@ -841,6 +842,55 @@ public class Helper {
         return result.toArray(new String[0]);
     }
 
+    static String getLocalizedAsset(Context context, String name) throws IOException {
+        if (name == null || !name.contains("."))
+            throw new IllegalArgumentException(name);
+
+        String[] list = context.getResources().getAssets().list("");
+        if (list == null)
+            throw new IllegalArgumentException();
+
+        List<String> names = new ArrayList<>();
+        String[] c = name.split("\\.");
+        List<String> assets = Arrays.asList(list);
+
+        List<Locale> locales = new ArrayList<>();
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N)
+            locales.add(Locale.getDefault());
+        else {
+            LocaleList ll = context.getResources().getConfiguration().getLocales();
+            for (int i = 0; i < ll.size(); i++)
+                locales.add(ll.get(i));
+        }
+
+        for (Locale locale : locales) {
+            String language = locale.getLanguage();
+            String country = locale.getCountry();
+            if ("en".equals(language) && "US".equals(country))
+                names.add(name);
+            else {
+                String localized = c[0] + "-" + language + "-r" + country + "." + c[1];
+                if (assets.contains(localized))
+                    names.add(localized);
+            }
+        }
+
+        for (Locale locale : locales) {
+            String prefix = c[0] + "-" + locale.getLanguage();
+            for (String asset : assets)
+                if (asset.startsWith(prefix))
+                    names.add(asset);
+        }
+
+        names.add(name);
+
+        String asset = names.get(0);
+        Log.i("Using " + asset +
+                " of " + TextUtils.join(",", names) +
+                " (" + TextUtils.join(",", locales) + ")");
+        return asset;
+    }
+
     static boolean containsWhiteSpace(String text) {
         return text.matches(".*\\s+.*");
     }