Add util class for plurals

Bug: 199230228
Test: make
Change-Id: I5756846dcd10f17520afcc34bf23de0a45a2bcb9

core/java/android/util/PluralsMessageFormatter.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.util;
+
+import android.annotation.NonNull;
+import android.annotation.StringRes;
+import android.content.res.Resources;
+import android.icu.text.MessageFormat;
+
+import java.util.Map;
+
+/**
+ * Helper class for easier formatting of ICU {@link android.icu.text.MessageFormat} syntax.
+ * @hide
+ */
+public class PluralsMessageFormatter {
+    /**
+     * Formatting the ICU {@link android.icu.text.MessageFormat} syntax
+     *
+     * @param resources the {@link android.content.res.Resources}
+     * @param arguments the mapping of argument names and values
+     * @param messageId the string resource id with {@link android.icu.text.MessageFormat} syntax
+     * @return the formatted result
+     */
+    public static String format(@NonNull Resources resources,
+            Map<String, Object> arguments,
+            @StringRes int messageId) {
+        return new MessageFormat(resources.getString(messageId)).format(arguments);
+    }
+}