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Example:

var testTrad = PinyinHelper.getPinyin('乾淨', format: PinyinFormat.WITH_TONE_MARK);
print(testTrad);
var testSimpl = PinyinHelper.getPinyin('干净', format: PinyinFormat.WITH_TONE_MARK);
print(testSimpl);

Output:

qián jìng
gān jìng

demo:

import 'package:lpinyin/lpinyin.dart';

main() {
  print(PinyinHelper.getPinyin('李四',separator: ''));
  print(PinyinHelper.getPinyin('小李',separator: ''));
  print(PinyinHelper.getPinyin('王五',separator: ''));
}

output:

李si
xiaoli
wangwu

像 "a,b" 这种会报错，中间是英文逗号，我试了中文逗号，句号，英文句号等都可以，唯独英文逗号不行，这么什么问题？

The following RangeError was thrown while handling a gesture:
RangeError (index): Invalid value: Valid value range is empty: 0

When the exception was thrown, this was the stack:
#0 _StringBase.[] (dart:core-patch/string_patch.dart:252:55)
#1 PinyinHelper.getShortPinyin. (package:lpinyin/src/pinyin_helper.dart:51:21)

这个功能是尚未开发吗？

separator为""的情况下，拼音会少了最后一个字母

return (sb.toString().endsWith(separator)
? sb.toString().substring(0, sb.toString().length - 1)
: sb.toString());

想用来做内容的繁简转换，但是没有找到介绍里面说的 “简繁体中文转换” 的方法？

flutter can't import lpinyin.dart，error as below:

Try correcting the name to the name of an existing getter, or defining a getter or field named 'PinyinHelper'.
String pinyin = PinyinHelper.getPinyinE(user.userName);
^^^^^^^^^^^^
Unhandled exception:
FileSystemException(uri=org-dartlang-untranslatable-uri:package%3Alpinyin%2Flpinyin.dart; message=StandardFileSystem only supports file:*
and data:* URIs)
#0 StandardFileSystem.entityForUri (package:front_end/src/api_prototype/standard_file_system.dart:33:7)

#1 asFileUri (package:vm/kernel_front_end.dart:601:37)

#2
FrontendCompiler._outputDependenciesDelta (package:vm/frontend_server.dart:401:39)

#3 FrontendCompiler.compile (package:vm/frontend_server.dart:375:
13)

#4 _FlutterFrontendCompiler.compile (package:frontend_ser
ver/server.dart:31:22)

#5 starter (package:frontend_server/s
erver.dart:128:27)

#6 main (file:///C:/b/s/w/ir/k/src/flutter/frontend_ser
ver/bin/starter.dart:8:30)

#7 _startIsolate. (
dart:isolate-patch/isolate_patch.dart:299:32)
#8 _RawReceivePortImpl._handleMessage (dart:i
solate-patch/isolate_patch.dart:172:12)

Hello!

Is it possible to convert a pinyin string using numbers to the one with tone marks?

ni3hao3 => nǐhǎo

Thank you for the help!