Support EditorInfo#hintLocales in compat library.

This CL updates LatinIME's compatibility library so that we can access
EditorInfo#hintLocales without directly depending on unreleased SDK.

Bug: 22859862
Change-Id: I4ba7d294bc314002c3abf8842f097a4249783364

1 files changed, 14 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/compat/EditorInfoCompatUtils.java b/java/src/com/android/inputmethod/compat/EditorInfoCompatUtils.java
index 7eefa221a..43714829a 100644
--- a/java/src/com/android/inputmethod/compat/EditorInfoCompatUtils.java
+++ b/java/src/com/android/inputmethod/compat/EditorInfoCompatUtils.java
@@ -19,6 +19,7 @@ package com.android.inputmethod.compat;
 import android.view.inputmethod.EditorInfo;
 
 import java.lang.reflect.Field;
+import java.util.Locale;
 
 public final class EditorInfoCompatUtils {
     // Note that EditorInfo.IME_FLAG_FORCE_ASCII has been introduced
@@ -27,6 +28,8 @@ public final class EditorInfoCompatUtils {
             EditorInfo.class, "IME_FLAG_FORCE_ASCII");
     private static final Integer OBJ_IME_FLAG_FORCE_ASCII = (Integer) CompatUtils.getFieldValue(
             null /* receiver */, null /* defaultValue */, FIELD_IME_FLAG_FORCE_ASCII);
+    private static final Field FIELD_HINT_LOCALES = CompatUtils.getField(
+            EditorInfo.class, "hintLocales");
 
     private EditorInfoCompatUtils() {
         // This utility class is not publicly instantiable.
@@ -78,4 +81,15 @@ public final class EditorInfoCompatUtils {
         }
         return (action != null) ? flags + action : flags.toString();
     }
+
+    public static Locale getPrimaryHintLocale(final EditorInfo editorInfo) {
+        if (editorInfo == null) {
+            return null;
+        }
+        final Object localeList = CompatUtils.getFieldValue(editorInfo, null, FIELD_HINT_LOCALES);
+        if (localeList == null) {
+            return null;
+        }
+        return LocaleListCompatUtils.getPrimary(localeList);
+    }
 }