[Settings] Support phone number talkback

Support phone number talkback in about phone UI pages.

Bug: 182923869
Test: local, junit
Change-Id: I159827070a954dee13230ff7cf6de81dbbaa7545

src/com/android/settings/deviceinfo/PhoneNumberUtil.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2021 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 com.android.settings.deviceinfo;
+
+import android.text.Spannable;
+import android.text.SpannableStringBuilder;
+import android.text.Spanned;
+import android.text.TextUtils;
+import android.text.style.TtsSpan;
+
+import java.util.Arrays;
+import java.util.stream.IntStream;
+
+/**
+ * Helper class to detect format of phone number.
+ */
+public class PhoneNumberUtil {
+
+    /**
+     * Convert given text to support phone number talkback.
+     * @param text given
+     * @return converted text
+     */
+    public static CharSequence expandByTts(CharSequence text) {
+        if ((text == null) || (text.length() <= 0)
+            || (!isPhoneNumberDigits(text))) {
+            return text;
+        }
+        Spannable spannable = new SpannableStringBuilder(text);
+        TtsSpan span = new TtsSpan.DigitsBuilder(text.toString()).build();
+        spannable.setSpan(span, 0, spannable.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+        return spannable;
+    }
+
+    /**
+     * Check if given text may contains a phone id related numbers.
+     * (ex: phone number, IMEI, ICCID)
+     * @param text given
+     * @return true when given text is a phone id related number.
+     */
+    private static boolean isPhoneNumberDigits(CharSequence text) {
+        long textLength = (long)text.length();
+        return (textLength == text.chars()
+                .filter(c -> isPhoneNumberDigit(c)).count());
+    }
+
+    private static boolean isPhoneNumberDigit(int c) {
+        return ((c >= (int)'0') && (c <= (int)'9'))
+            || (c == (int)'-') || (c == (int)'+')
+            || (c == (int)'(') || (c == (int)')');
+    }
+}