import 'dart:convert' as convert;
///判斷為空
bool StrIsEmpty(dynamic object) {
if (object == null) return true;
if (object == []) return true;
if (object == '') return true;
if (object == 'null') return true;
if (object == '(null)') return true;
if (object == '<null>') return true;
if (object is String && object.isEmpty) {
return true;
} else if (object is List && object.isEmpty) {
return true;
} else if (object is Map && object.isEmpty) {
return true;
}
return false;
}
///判斷為非空
bool StrIsNotEmpty(dynamic object) {
bool isEmpty = StrIsEmpty(object);
return isEmpty==false;
}
//轉(zhuǎn)為bool值
bool BoolValue(dynamic obj, {bool defaultBool = false}) {
if(obj is bool){
return obj;
}
return defaultBool;
}
//轉(zhuǎn)為字符串
String StrValue(dynamic obj){
if(obj==null || obj=='null' || obj=='<null>' || obj=='(null)' || obj=='[]' || obj=='{}'){
return '';
}
if ((obj is int) || (obj is double) || (obj is Map) || (obj is List)){
return obj.toString();
}
if (obj is bool) {
if(obj==true){
return 'true';
} else {
return 'false';
}
}
if(obj is String){
return obj;
}
return obj.toString();
//String轉(zhuǎn)int
// String a = '33';
// int b = int.parse(a);
}
//轉(zhuǎn)為int整型字符串
String IntegerStrValue(dynamic obj){
if(obj==null || obj=='null' || obj=='<null>' || obj=='(null)' || obj=='[]' || obj=='{}'){
return '0';
}
if (obj is bool) {
if(obj==true){
return '1';
} else {
return '0';
}
}
if(obj is int) {
return '$obj';
}
String objStr = StrValue(obj);
//double或者double類型的字符串不能直接用int.tryParse()
///如dart：int ?rateParseInt = int.tryParse('4.0');===>null
///即不能用: int ?num = int.tryParse(objStr);
///可以使用num中轉(zhuǎn)，將String類型轉(zhuǎn)為int類型
num ?resNum = num.tryParse(objStr);
int resInt = resNum?.toInt()??0;
return resInt.toString();
}
//轉(zhuǎn)為double浮點(diǎn)型字符串
String DoubleStrValue(dynamic obj){
if(obj==null || obj=='null' || obj=='<null>' || obj=='(null)' || obj=='[]' || obj=='{}'){
return '0';
}
if (obj is bool) {
if(obj==true){
return '1';
} else {
return '0';
}
}
String objStr = StrValue(obj);
double ?num = double.tryParse(objStr);
if(num is double) {
return num.toString();
}
return '0';
}
//轉(zhuǎn)為價(jià)格：1，1.1， 1.01; pNum：精度
String PriceStrValue(obj, {int pNum=2}){
if(StrIsEmpty(obj)){
return '0';
}
if(obj==null || obj=='null' || obj=='<null>' || obj=='(null)' || obj=='[]' || obj=='{}'){
return '0';
}
if (obj is bool) {
if(obj==true){
return '1';
} else {
return '0';
}
}
double p_getDoubleByValueStr(String valueStr) {
return double.tryParse(valueStr) ?? 0;
}
//doubleStr：1表現(xiàn)的可能為1.000000000001或者0.000000000009
//String doubleStr = DoubleStrValue(obj);
//浮點(diǎn)型
double objDouble = DynamicToDouble(obj);//p_getDoubleByValueStr(doubleStr);
//判斷負(fù)數(shù)
bool hasFu= objDouble<0;
//四舍五入保留兩位小數(shù)
String objString = '';
if(hasFu){ //負(fù)號(hào)需要提前
objString = "-${objDouble.abs().toStringAsFixed(pNum)}";
} else {
objString =objDouble.toStringAsFixed(pNum);
}
if(objString.contains('.')==false){
return objString;
}
if(objString.contains('.')){
List<String> temp=objString.split('.');
String v0= temp[0];
String v1 = temp[1];
if(pNum>5){//5位以上的全顯示
return '${v0}.${v1}';
}
String v1_a = v1;
if(v1_a.endsWith('00000')){
int k = v1_a.lastIndexOf('00000');
v1_a = v1_a.substring(0,k);
}
if(v1_a.endsWith('0000')){
int k = v1_a.lastIndexOf('0000');
v1_a = v1_a.substring(0,k);
}
if(v1_a.endsWith('000')){
int k = v1_a.lastIndexOf('000');
v1_a = v1_a.substring(0,k);
}
if(v1_a.endsWith('00')){
int k = v1_a.lastIndexOf('00');
v1_a = v1_a.substring(0,k);
}
if(v1_a.endsWith('0')){
int k = v1_a.lastIndexOf('0');
v1_a = v1_a.substring(0,k);
}
if(StrIsEmpty(v1_a)){
return v0;
}
return '${v0}.${v1_a}';
}
return objString;
}
//輸入框文字去掉空白
String TFSearchStr(dynamic txt){
String needStr = StrValue(txt).trim();
return needStr;
}
//字符串相等
bool StrIsEqual(dynamic obj1, dynamic obj2){
if(obj1==obj2){
return true;
}
return false;
}
StrThreeConnect(dynamic obj1, dynamic obj2, dynamic obj3) {
return '$obj1$obj2$obj3';
}
List JsonStrToList(dynamic obj){
if(StrIsEmpty(obj)){
return [];
}
if(!(obj is String)){
return [];
}
List list = DynamicTolist(convert.jsonDecode(obj));
return list;
}
Map JsonStrToMap(dynamic obj){
if(StrIsEmpty(obj)){
return {};
}
if(!(obj is String)){
return {};
}
Map map = DynamicTomap(convert.jsonDecode(obj));
return map;
}
String ObjToJsonStr(dynamic obj){
if((obj is Map) || (obj is List)){
return convert.jsonEncode(obj);
}
return StrValue(obj);
}
//將map中的key的json字符串轉(zhuǎn)化為json對(duì)象
dynamic MapJsonvalueToObject(dynamic map, String key, {int defaultType=0}){
dynamic defaultValue = {};
if(defaultType==0){//轉(zhuǎn)為Map
defaultValue = {};
} else if(defaultType==1){//轉(zhuǎn)為L(zhǎng)ist
defaultValue = [];
} else if(defaultType==2){//轉(zhuǎn)為String
defaultValue = '';
}
if(map==null || key==null || key.length<1){
return defaultValue;
}
Map myMap = map as Map;
if(myMap.keys.length<1){
return defaultValue;
}
if(myMap.containsKey(key) == false){
return defaultValue;
}
if((myMap[key] is String) == false){
return defaultValue;
}
return convert.jsonDecode(myMap[key])??defaultValue;
}
//獲取map 的 key 對(duì)應(yīng) 任意類型的value
dynamic MapValueobj(dynamic map, dynamic key){
if(!(map is Map)){
return '';
}
if(StrIsEmpty(key)){
return '';
}
Map myMap = map as Map;
if(myMap.keys.isEmpty){
return '';
}
if(myMap.containsKey(key) == false){
return '';
}
return myMap[key];
}
//獲取map 的 key 對(duì)應(yīng) List類型的value
List MapValuelist(dynamic map, dynamic key){
dynamic org = MapValueobj(map, key);
if(org is List) {
return org;
}
return [];
}
//獲取map 的 key 對(duì)應(yīng) Map類型的value
Map MapValuemap(dynamic map, dynamic key){
dynamic org = MapValueobj(map, key);
if(org is Map) {
return org;
}
return {};
}
//獲取map 的 key 對(duì)應(yīng) int類型的value
int MapValueint(dynamic map, dynamic key){
if(!(map is Map)){
return 0;
}
if(StrIsEmpty(key)){
return 0;
}
Map myMap = map as Map;
if(myMap.keys.length<1){
return 0;
}
if(myMap.containsKey(key) == false){
return 0;
}
var res = myMap[key];
if(res is int){
return res;
}
if(res is double){
return res.toInt();
}
if(res is String){
//double或者double類型的字符串不能直接用int.tryParse()
///如dart：int ?rateParseInt = int.tryParse('4.0');===>null
///即不能用: int ?num = int.tryParse(objStr);
///可以使用num中轉(zhuǎn)，將String類型轉(zhuǎn)為int類型
num ?resNum = num.tryParse(res);
int resInt = resNum?.toInt()??0;
return resInt;
}
return 0;
}
//獲取map 的 key 對(duì)應(yīng) bool類型的value
bool MapValuebool(dynamic map, dynamic key,{bool defaultBool = false}){
if(!(map is Map)){
return defaultBool;
}
if(StrIsEmpty(key)){
return defaultBool;
}
Map myMap = map as Map;
if(myMap.keys.length<1){
return defaultBool;
}
if(myMap.containsKey(key) == false){
return defaultBool;
}
var res = myMap[key];
if(res is bool){
return res;
}
if(res == 1){
return true;
}
if(res == 0){
return false;
}
return defaultBool;
}
//獲取list數(shù)組的index下標(biāo)對(duì)應(yīng)的元素
dynamic ListValueAtIndex(dynamic list, int index, {String defaultValue=''}){
if(!(list is List && list.isNotEmpty)){
return defaultValue;
}
if(index>list.length-1){
return defaultValue;
}
return (list as List)[index];
}
//獲取map 的 key 對(duì)應(yīng) String類型的value
String MapValueStr(dynamic map, dynamic key){
if(!(map is Map)){
return '';
}
if(StrIsEmpty(key)){
return '';
}
Map myMap = map as Map;
if(myMap.keys.isEmpty){
return '';
}
if(myMap.containsKey(key) == false){
return '';
}
dynamic obj = myMap[key];
if(obj==null || obj=='null' || obj=='<null>' || obj=='(null)' || obj=='[]' || obj=='{}'){
return '';
}
if ((obj is int) || (obj is double) || (obj is Map) || (obj is List)){
return obj.toString();
}
if (obj is bool) {
if(obj==true){
return 'true';
} else {
return 'false';
}
}
if(obj is String){
return obj;
}
return obj.toString();
}
//獲取map 的 key 對(duì)應(yīng) double類型的value
double MapValuedouble(dynamic map, dynamic key){
if(!(map is Map)){
return 0;
}
if(StrIsEmpty(key)){
return 0;
}
Map myMap = map as Map;
if(myMap.keys.length<1){
return 0;
}
if(myMap.containsKey(key) == false){
return 0;
}
var res = myMap[key];
if(res is double){
return res;
}
if(res is int){
return res.toDouble();
}
if(res is String){
if(double.tryParse(res) is double){
return double.tryParse(res)??0;
}
return 0;
}
return 0;
}
//數(shù)據(jù)轉(zhuǎn)化為int
int DynamicToInt(dynamic count) {
if (StringUtils.isEmpty(count)) {
return 0;
} else if (count is double) {
return count.toInt();
} else if (count is String) {
//double或者double類型的字符串不能直接用int.tryParse()
///如dart：int ?rateParseInt = int.tryParse('4.0');===>null
///即不能用: int ?num = int.tryParse(objStr);
///可以使用num中轉(zhuǎn)，將String類型轉(zhuǎn)為int類型
num ?resNum = num.tryParse(count);
int resInt = resNum?.toInt()??0;
return resInt;
} else if (count is int) {
return count;
} else {
return 0;
}
}
//數(shù)據(jù)轉(zhuǎn)化為list(隱式轉(zhuǎn)為顯式)
List DynamicTolist(dynamic count) {
if (StrIsEmpty(count)) {
return [];
} else if (count is List) {
return count;
}
return [];
}
//數(shù)據(jù)轉(zhuǎn)化為Map(隱式轉(zhuǎn)為顯式)
Map DynamicTomap(dynamic count) {
if (StrIsEmpty(count)) {
return {};
} else if (count is Map) {
return count;
}
return {};
}
//數(shù)據(jù)轉(zhuǎn)化為double
double DynamicToDouble(dynamic count) {
if (StringUtils.isEmpty(count)) {
return 0;
} else if (count is double) {
return count;
} else if (count is String) {
double t = double.tryParse(count) ?? 0;
return t;
} else if (count is int) {
return count.toDouble();
} else {
return 0;
}
}
//數(shù)據(jù)轉(zhuǎn)化為bool
bool DynamicToBool(dynamic count, {bool defaultValue=false}) {
if (StringUtils.isEmpty(count)) {
return defaultValue;
}
if (count is bool) {
return count;
}
if (count is String) {
if(count=='true'){
return true;
}
if(count=='false'){
return false;
}
}
if (count==1) {
return true;
}
return defaultValue;
}
//獲取map 的 key 對(duì)應(yīng)逗號(hào)(splitStr)拼接的url(字符串)數(shù)組
List MapValueUrlsByCommastr(dynamic map, dynamic key, {String splitStr = ','}){
String imgsStr = MapValueStr(map, key);
if(StrIsEmpty(imgsStr)){
return [];
}
dynamic spliArr = imgsStr.split(splitStr);
if(spliArr is List && (spliArr as List).isNotEmpty){
return spliArr as List;
}
return [];
}
//獲取map 的 key 對(duì)應(yīng)Map<String, dynamic>數(shù)組的url數(shù)組
List GetImageUrlsOfMap(dynamic infoMap, String key, {String picKey='filePath'}){
List imageUrls = [];
if(!StrIsEmpty(MapValueobj(infoMap, key))){
for(dynamic obj in infoMap[key]){
if(!StrIsEmpty(MapValueStr(obj, picKey))){
imageUrls.add(MapValueStr(obj, picKey));
}
}
}
return imageUrls;
}
//從逗號(hào)"," 拼接的字符串中轉(zhuǎn)化為包含url的數(shù)組
List GetUrlsByStr(dynamic imgObj, {String flag=','}){
String imgStrs = StrValue(imgObj);
if(StrIsEmpty(imgStrs)){
return [];
}
dynamic tmp = imgStrs.split(flag);
List needArr = [];
if(tmp is List && tmp.isNotEmpty) {
needArr.addAll(tmp);
}
return needArr;
}
//從"/" 拼接的字符串中轉(zhuǎn)化為包含url的數(shù)組
List GetListByStr(dynamic imgObj, {String flag='/'}){
String imgStrs = StrValue(imgObj);
if(StrIsEmpty(imgStrs)){
return [];
}
dynamic tmp = imgStrs.split(flag);
List needArr = [];
if(tmp is List && tmp.isNotEmpty) {
needArr.addAll(tmp);
}
return needArr;
}
//價(jià)格金額顯示處理:將字符串轉(zhuǎn)為0.00的形式
String PriceValue(dynamic obj){
if(obj==null || obj=='null' || obj=='<null>' || obj=='(null)' || obj=='[]' || obj=='{}' || obj==''){
return '0.00';
}
//int long double 等number類型都可以調(diào)用toStringAsFixed
if ((obj is int) || (obj is double)){
String priceStr = obj.toStringAsFixed(2);
return priceStr;
}
if(obj is String){
double price = double.tryParse(obj)??0;
String priceStr = price.toStringAsFixed(2);
return priceStr;
}
return obj.toString();
}
///檢測(cè)Map 的 某個(gè)key 對(duì)應(yīng)的value不是空(空值)數(shù)組----=== MapValuelist(map, key).isNotEmpty
bool MapValueForKeyIsNotNilArr({required dynamic map, required String key}) {
//return true不是空(空值)數(shù)組; false 是空;
if(StringUtils.isEmpty(key)){
return false;
}
if((map is Map)==false){
return false;
}
if((map as Map).containsKey(key)==false){
return false;
}
if(((map as Map)[key] is List)==false){
return false;
}
if(((map as Map)[key] as List).length>0){
return true;
}
return false;
}
Flutter 常用函數(shù)
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【社區(qū)內(nèi)容提示】社區(qū)部分內(nèi)容疑似由AI輔助生成，瀏覽時(shí)請(qǐng)結(jié)合常識(shí)與多方信息審慎甄別。
平臺(tái)聲明：文章內(nèi)容（如有圖片或視頻亦包括在內(nèi)）由作者上傳并發(fā)布，文章內(nèi)容僅代表作者本人觀點(diǎn)，簡(jiǎn)書(shū)系信息發(fā)布平臺(tái)，僅提供信息存儲(chǔ)服務(wù)。
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