最近有个关于通讯录开发的需求，需求很简单：根据手机号码查询姓名。之前有获取通讯录列表的代码如下：

/*** 获取本机手机联系人列表* * @author yinbiao* @date 2016-4-5 上午11:03:48* @param context* @return*/public synchronized static List<MocamContact> getLocalPhoneContacts(Context context) {String[] projection = { Phone.DISPLAY_NAME, Phone.NUMBER };List<MocamContact> list = new ArrayList<MocamContact>();ContentResolver resolver = context.getContentResolver();// 获取手机联系人Cursor cursor = resolver.query(Phone.CONTENT_URI, projection, null, null, null);if (cursor != null) {while (cursor.moveToNext()) {// 得到手机号码String phoneNumber = cursor.getString(cursor.getColumnIndex(Phone.NUMBER));// 如果不是正確的手機號碼 跳过当前循环if (!isMobileNomber(phoneNumber)) {continue;}// 得到联系人名称String name = cursor.getString(cursor.getColumnIndex(Phone.DISPLAY_NAME));MocamContact contact = new MocamContact(phoneNumber, name);list.add(contact);}cursor.close();}return list;}

/*** 判断是否是正确的手机号码* * @author yinbiao* @date 2016-4-6 下午3:17:17* @param mobileNumber* @return*/public static boolean isMobileNomber(String mobileNumber) {if (TextUtils.isEmpty(mobileNumber)) {return false;}Pattern p = Pattern.compile("^((13[0-9])|(15[^4,\\D])|(18[0,5-9]))\\d{8}$");Matcher m = p.matcher(mobileNumber);return m.matches();}

实现该需求，我只需要拿到手机号码，然后去 Phone.CONTENT_URI表查询姓名字段即可，so 代码如下：

/*** 根据手机号码查询联系人姓名* * @author yinbiao* @date 2016-4-6 上午9:29:42* @param context* @param phoneNum* @return*/public synchronized static String getDisplayNameByPhone(Context context, String phoneNum) {String displayName = null;ContentResolver resolver = context.getContentResolver();Cursor cursor = resolver.query(Phone.CONTENT_URI, projection, Phone.NUMBER + "=?",new String[]{phoneNum}, null);if (cursor != null) {while (cursor.moveToNext()) {displayName = cursor.getString(cursor.getColumnIndex(Phone.DISPLAY_NAME));if (!TextUtils.isEmpty(displayName)) {break;}}}return displayName;}

是不是比较简单？但是  坑  出现了，真机调试中，根据手机号码怎么都查询不到姓名，反复检查代码没有发现问题所在，百思不得其解。

然后反其道行之，写了一个根据姓名查询手机号码的demo，代码如下：

       public synchronized static String getPhoneByName(Context context, String name) {String displayName = null;ContentResolver resolver = context.getContentResolver();Cursor cursor = resolver.query(Phone.CONTENT_URI, projection, Phone.DISPLAY_NAME + "=?",new String[]{name}, null);if (cursor != null) {while (cursor.moveToNext()) {displayName = cursor.getString(cursor.getColumnIndex(Phone.NUMBER));if (!TextUtils.isEmpty(displayName)) {break;}}}return displayName;}

然后输入通讯录中的某一个联系人姓名进行查询，得到了手机号码显示：

仔细一看，数据库中存的手机号码中间居然有空格，终于知道了问题的原因，这下好改了，只需要查询是，给手机号码中间特定的位置插入空格就OK，查资料发现有些系统没有空格，有些系统中间加的是横线 “-”；所以将代码做如下改动：

/*** 根据手机号码查询联系人姓名* * @author yinbiao* @date 2016-4-6 上午9:29:42* @param context* @param phoneNum(传入纯数字手机号码)* @return*/public synchronized static String getDisplayNameByPhone1(Context context, String phoneNum) {String displayName = null;String phone1 = new StringBuffer(phoneNum.subSequence(0, 3)).append(" ").append(phoneNum.substring(3, 7)).append(" ").append(phoneNum.substring(7, 11)).toString();String phone2 = new StringBuffer(phoneNum.subSequence(0, 3)).append("-").append(phoneNum.substring(3, 7)).append("-").append(phoneNum.substring(7, 11)).toString();ContentResolver resolver = context.getContentResolver();Cursor cursor = resolver.query(Phone.CONTENT_URI, projection, Phone.NUMBER + " in(?,?,?)", new String[] {phoneNum, phone1, phone2 }, null);if (cursor != null) {while (cursor.moveToNext()) {displayName = cursor.getString(cursor.getColumnIndex(Phone.DISPLAY_NAME));if (!TextUtils.isEmpty(displayName)) {break;}cursor.close();}}return displayName;}

再次运行，输入11位手机号码，正确显示该号码对应的联系人姓名。