[Payments] Format and validate phone number by using libphonenumber

chrome/android/java/src/org/chromium/chrome/browser/autofill/PhoneNumberUtil.java

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.autofill;
+
+import android.text.Editable;
+import android.text.TextWatcher;
+
+import org.chromium.base.ThreadUtils;
+import org.chromium.base.annotations.JNINamespace;
+
+/**
+ * Android wrapper of i18n::phonenumbers::PhoneNumberUtil which provides convenient methods to
+ * format and validate phone number.
+ */
+@JNINamespace("autofill")
+public class PhoneNumberUtil {
+    private static PhoneNumberUtil sPhoneNumberUtil;
+
+    /** Phone number formatter to monitor changes so as to format it dynamically */
+    public class Formatter implements TextWatcher {
+        /** Indicates the change was caused by ourselves. */
+        private boolean mSelfChange = false;
+
+        @Override
+        public void afterTextChanged(Editable s) {
+            if (mSelfChange) return;
+
+            String formatedNumber = sPhoneNumberUtil.format(s.toString());
+            mSelfChange = true;
+            s.replace(0, s.length(), formatedNumber, 0, formatedNumber.length());
+            mSelfChange = false;
+        }
+
+        @Override
+        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
+
+        @Override
+        public void onTextChanged(CharSequence s, int start, int before, int count) {}
+    }
+
+    private final long mPhoneNumberUtilAndroid;
+    private PhoneNumberUtil() {
+        mPhoneNumberUtilAndroid = nativeInit();

[Mathieu, 2017/03/10 20:42:51]

As mentioned, consider removing the class from the C++ side and calling Format
and Parse directly 

[gogerald1, 2017/03/10 23:17:36]

Done.

+    }
+
+    public static PhoneNumberUtil getInstance() {
+        ThreadUtils.assertOnUiThread();
+        if (sPhoneNumberUtil == null) {
+            sPhoneNumberUtil = new PhoneNumberUtil();
+        }
+        return sPhoneNumberUtil;
+    }
+
+    /**
+     * Gets a formatter to monitor phone number changes so as to format it dynamically.
+     *
+     * @return The formatter.
+     */
+    public Formatter getFormatter() {
+        return new Formatter();
+    }
+
+    /**
+     * Formats the given phone number.
+     *
+     * @param phoneNumber The given phone number.
+     * @return formatted phone number.
+     */
+    public String format(String phoneNumber) {
+        return nativeFormat(mPhoneNumberUtilAndroid, phoneNumber);
+    }
+
+    /**
+     * Checks whether the given phone number is valid.
+     *
+     * @param phoneNumber The given phone number.
+     * @return True if the given number is valid, otherwise return false.
+     */
+    public boolean isValidNumber(String phoneNumber) {
+        return nativeIsValidNumber(mPhoneNumberUtilAndroid, phoneNumber);
+    }
+
+    private native long nativeInit();
+    private native String nativeFormat(long nativePhoneNumberUtilAndroid, String phoneNumber);
+    private native boolean nativeIsValidNumber(
+            long nativePhoneNumberUtilAndroid, String phoneNumber);
+}