话不多说,直接进入正题
//int ---> hex
String _intToHex(int num) {
String hexString = num.toRadixString(16);
return hexString;
}
推荐使用_hexToInt2
方法转换
//hex ---> int 更简单,加上了容错处理(感谢 @"坐了整个春夏秋冬" 小伙伴的反馈)
int? _hexToInt2(String hex) {
int? val;
if(hex.toUpperCase().contains("0X")){
String desString = hex.substring(2);
val = int.tryParse("0x$desString");
}else {
val = int.tryParse("0x$hex");
}
return val;
}
//hex ---> int
int _hexToInt(String hex) {
int val = 0;
int len = hex.length;
for (int i = 0; i < len; i++) {
int hexDigit = hex.codeUnitAt(i);
if (hexDigit >= 48 && hexDigit <= 57) {
val += (hexDigit - 48) * (1 << (4 * (len - 1 - i)));
} else if (hexDigit >= 65 && hexDigit <= 70) {
// A..F
val += (hexDigit - 55) * (1 << (4 * (len - 1 - i)));
} else if (hexDigit >= 97 && hexDigit <= 102) {
// a..f
val += (hexDigit - 87) * (1 << (4 * (len - 1 - i)));
} else {
throw new FormatException("Invalid hexadecimal value");
}
}
return val;
}
//int ---> 指定长度的hex (如指定长度为6的情况,0x000001 0x001234, 0xefab23)
String _intToFormatHex(int num) {
String hexString = num.toRadixString(16);
print("hexString=$hexString");
String formatString = hexString.padLeft(6, "0");
print("formatHexString=$formatString");
return formatString;
}
点击一下floatingActionButton,测试结果如下:
image.png
完整代码如下:
import 'package:flutter/material.dart';
// import 'package:flutter_app_log_test/zz_log.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("widget.title"),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
String a = _intToHex(998);
int b = _hexToInt(a);
int k = int.parse("0x" +a);
print("a=$a");
print("b=$b");
print("k=$k");
String c = _intToFormatHex(998);
print("c=$c");
print("-----------下面是_hexToInt2---------------");
int? i = _hexToInt2("0x" +a);
print("i=$i");
int? n = _hexToInt2("0X" +a);
print("n=$n");
int? p = _hexToInt2("0Xx22222" +a);
print("p=$p");
},
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
//int ---> hex
String _intToHex(int num) {
String hexString = num.toRadixString(16);
return hexString;
}
//hex ---> int
int _hexToInt(String hex) {
int val = 0;
int len = hex.length;
for (int i = 0; i < len; i++) {
int hexDigit = hex.codeUnitAt(i);
if (hexDigit >= 48 && hexDigit <= 57) {
val += (hexDigit - 48) * (1 << (4 * (len - 1 - i)));
} else if (hexDigit >= 65 && hexDigit <= 70) {
// A..F
val += (hexDigit - 55) * (1 << (4 * (len - 1 - i)));
} else if (hexDigit >= 97 && hexDigit <= 102) {
// a..f
val += (hexDigit - 87) * (1 << (4 * (len - 1 - i)));
} else {
throw new FormatException("Invalid hexadecimal value");
}
}
return val;
}
//hex ---> int 更简单,加上了容错处理(感谢 @"坐了整个春夏秋冬" 小伙伴的反馈)
int? _hexToInt2(String hex) {
int? val;
if(hex.toUpperCase().contains("0X")){
String desString = hex.substring(2);
val = int.tryParse("0x$desString");
}else {
val = int.tryParse("0x$hex");
}
return val;
}
//int ---> 指定长度的hex (如指定长度为6的情况,0x000001 0x001234, 0xefab23)
String _intToFormatHex(int num) {
String hexString = num.toRadixString(16);
print("hexString=$hexString");
String formatString = hexString.padLeft(6, "0");
print("formatHexString=$formatString");
return formatString;
}
}
结尾
今天的分享先到这里了,后续会分享更多的干货,欢迎点赞,加关注了,祝君好运!!
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