Java tutorial
//package com.java2s; import android.text.TextUtils; import java.util.regex.Pattern; public class Main { public static boolean isMobileValid(String mobile) { if (TextUtils.isEmpty(mobile) || !TextUtils.isDigitsOnly(mobile)) { return false; } return Pattern.matches("^(\\+86)?(1[3-9][0-9])\\d{8}$", mobile); } }