diff --git a/core/java/com/android/internal/inputmethod/InputMethodUtils.java b/core/java/com/android/internal/inputmethod/InputMethodUtils.java
index ac17cbe..742173b 100644
--- a/core/java/com/android/internal/inputmethod/InputMethodUtils.java
+++ b/core/java/com/android/internal/inputmethod/InputMethodUtils.java
@@ -1302,4 +1302,131 @@
             return enabledInputMethodAndSubtypes;
         }
     }
+
+    // For spell checker service manager.
+    // TODO: Should we have TextServicesUtils.java?
+    private static final Locale LOCALE_EN_US = new Locale("en", "US");
+    private static final Locale LOCALE_EN_GB = new Locale("en", "GB");
+
+    /**
+     * Returns a list of {@link Locale} in the order of appropriateness for the default spell
+     * checker service.
+     *
+     * <p>If the system language is English, and the region is also explicitly specified in the
+     * system locale, the following fallback order will be applied.</p>
+     * <ul>
+     * <li>(system-locale-language, system-locale-region, system-locale-variant) (if exists)</li>
+     * <li>(system-locale-language, system-locale-region)</li>
+     * <li>("en", "US")</li>
+     * <li>("en", "GB")</li>
+     * <li>("en")</li>
+     * </ul>
+     *
+     * <p>If the system language is English, but no region is specified in the system locale,
+     * the following fallback order will be applied.</p>
+     * <ul>
+     * <li>("en")</li>
+     * <li>("en", "US")</li>
+     * <li>("en", "GB")</li>
+     * </ul>
+     *
+     * <p>If the system language is not English, the following fallback order will be applied.</p>
+     * <ul>
+     * <li>(system-locale-language, system-locale-region, system-locale-variant) (if exists)</li>
+     * <li>(system-locale-language, system-locale-region) (if exists)</li>
+     * <li>(system-locale-language) (if exists)</li>
+     * <li>("en", "US")</li>
+     * <li>("en", "GB")</li>
+     * <li>("en")</li>
+     * </ul>
+     *
+     * @param systemLocale the current system locale to be taken into consideration.
+     * @return a list of {@link Locale}. The first one is considered to be most appropriate.
+     */
+    @VisibleForTesting
+    public static ArrayList<Locale> getSuitableLocalesForSpellChecker(
+            @Nullable final Locale systemLocale) {
+        final Locale systemLocaleLanguageCountryVariant;
+        final Locale systemLocaleLanguageCountry;
+        final Locale systemLocaleLanguage;
+        if (systemLocale != null) {
+            final String language = systemLocale.getLanguage();
+            final boolean hasLanguage = !TextUtils.isEmpty(language);
+            final String country = systemLocale.getCountry();
+            final boolean hasCountry = !TextUtils.isEmpty(country);
+            final String variant = systemLocale.getVariant();
+            final boolean hasVariant = !TextUtils.isEmpty(variant);
+            if (hasLanguage && hasCountry && hasVariant) {
+                systemLocaleLanguageCountryVariant = new Locale(language, country, variant);
+            } else {
+                systemLocaleLanguageCountryVariant = null;
+            }
+            if (hasLanguage && hasCountry) {
+                systemLocaleLanguageCountry = new Locale(language, country);
+            } else {
+                systemLocaleLanguageCountry = null;
+            }
+            if (hasLanguage) {
+                systemLocaleLanguage = new Locale(language);
+            } else {
+                systemLocaleLanguage = null;
+            }
+        } else {
+            systemLocaleLanguageCountryVariant = null;
+            systemLocaleLanguageCountry = null;
+            systemLocaleLanguage = null;
+        }
+
+        final ArrayList<Locale> locales = new ArrayList<>();
+        if (systemLocaleLanguageCountryVariant != null) {
+            locales.add(systemLocaleLanguageCountryVariant);
+        }
+
+        if (Locale.ENGLISH.equals(systemLocaleLanguage)) {
+            if (systemLocaleLanguageCountry != null) {
+                // If the system language is English, and the region is also explicitly specified,
+                // following fallback order will be applied.
+                // - systemLocaleLanguageCountry [if systemLocaleLanguageCountry is non-null]
+                // - en_US [if systemLocaleLanguageCountry is non-null and not en_US]
+                // - en_GB [if systemLocaleLanguageCountry is non-null and not en_GB]
+                // - en
+                if (systemLocaleLanguageCountry != null) {
+                    locales.add(systemLocaleLanguageCountry);
+                }
+                if (!LOCALE_EN_US.equals(systemLocaleLanguageCountry)) {
+                    locales.add(LOCALE_EN_US);
+                }
+                if (!LOCALE_EN_GB.equals(systemLocaleLanguageCountry)) {
+                    locales.add(LOCALE_EN_GB);
+                }
+                locales.add(Locale.ENGLISH);
+            } else {
+                // If the system language is English, but no region is specified, following
+                // fallback order will be applied.
+                // - en
+                // - en_US
+                // - en_GB
+                locales.add(Locale.ENGLISH);
+                locales.add(LOCALE_EN_US);
+                locales.add(LOCALE_EN_GB);
+            }
+        } else {
+            // If the system language is not English, the fallback order will be
+            // - systemLocaleLanguageCountry  [if non-null]
+            // - systemLocaleLanguage  [if non-null]
+            // - en_US
+            // - en_GB
+            // - en
+            if (systemLocaleLanguageCountry != null) {
+                locales.add(systemLocaleLanguageCountry);
+            }
+            if (systemLocaleLanguage != null) {
+                locales.add(systemLocaleLanguage);
+            }
+            locales.add(LOCALE_EN_US);
+            locales.add(LOCALE_EN_GB);
+            locales.add(Locale.ENGLISH);
+        }
+        return locales;
+    }
 }