我们使用FutureBuilder来异步获取时间戳,并在获取完成后显示结果。 getCurrentTimestamp函数使用DateTime.now()获取当前时间对象,然后通过millisecondsSinceEpoch属性获取自Unix纪元(1970年1月1日00:00:00 UTC)以来的毫秒数,即当前时间的时间戳。
Epoch timestamp or Unix timestamp is a long number in milliseconds to refer to a time of a day. It is the Count of milliseconds elapsed since 1970-01-01 PST. #How to get the Current Epoch Timestamp in Dart/Flutter Dart provides theDateTimeclass to provide Date and Time-related functions...
fieldType == FieldType.timestamp) { sql += " "; sql += field.fieldName; sql += " TIMESTAMP DEFAULT CURRENT_TIMESTAMP "; } if (field.notNull) { sql += " NOT NULL "; } nCount++; if (nCount < fieldList.length) { sql += ","; } }); sql += ")"; print("create...
'engineEnterTimestampMicros': engineEnterTimestampMicros, }; ... traceInfo['timeToFrameworkInitMicros'] = timeToFrameworkInitMicros; ... traceInfo['timeToFirstFrameRasterizedMicros'] = firstFrameRasterizedTimestampMicros - engineEnterTimestampMicros; ... traceInfo['timeToFirstFrameMicros'] = time...
然后运行flutter pub get来安装插件。 使用插件 1. 导入插件 import'package:ultimate_milliseconds/ultimate_milliseconds.dart'; 2. 获取当前时间戳 intcurrentTimestamp=UltimateMilliseconds.now();print('当前时间戳: $currentTimestamp'); 3. 将时间戳转换为日期时间 ...
onPressed: () {/// 获取相关的 ChangeNotifier 对象varmyModel = context.read<_MyModel>();/// 调用此对象的方法后(且此方法内有 notifyListeners() 的调用)就会走到 Consumer<T>,然后重绘 Consumer<T> 内的 WidgetmyModel.add("${currentTimestamp()}");/// 如果你不想走到 Consumer<T> 重绘,可以...
System.load(lib.getAbsolutePath()); }else{ System.loadLibrary("flutter"); } } longinitTimeMillis = SystemClock.uptimeMillis() - initStartTimestampMillis; nativeRecordStartTimestamp(initTimeMillis);//[见小节2.7] } 该方法的主要工作是:
onPressed: ()async{vardir =awaitgetApplicationDocumentsDirectory();///根据文件路径实例化 File 对象finalfile = File('${dir.path}/data.txt');///在指定的文件写入指定内容的文本,文件不存在则创建,文件存在则重写awaitfile.writeAsString("hello${currentTimestamp()}", encoding: utf8); ...
length - maxframes); } //如果有原始帧回调函数,则执行 if (orginalCallback != null) { orginalCallback(timings); } } double get fps { int sum = 0; for (FrameTiming timing in lastFrames) { //计算渲染耗时 int duration = timing.timestampInMicroseconds(FramePhase.rasterFinish) - timing....
x = config.getCurrentPosition().dx; y = config.getCurrentPosition().dy; } void updatePosition(Duration timeStamp) { setState(() { var tempX = config.getOffset().dx; var tempY = config.getOffset().dy; if (tempX < 0) { tempX = 0; ...