开发日记：时间线对比 datesDiffen({ required String timeinfo, }) { String timeshow; DateTime time = DateTime.fromMillisecondsSinceEpoch(int.parse(timeinfo + '000')); DateTime localtime = DateTime.now(); Duration difftime = localtime.difference(time); int timeday = difftime.inDays; int timehour = difftime.inHours; int timemill = difftime.inMinutes; int timesecd = difftime.inSeconds; if (timeday > 0) { timeshow = '$timeday天前'; } else if (timehour > 0) { timeshow = '$timehour小时前'; } else if (timemill > 0) { timeshow = '$timemill分前'; } else if (timesecd > 0) { timeshow = '$timesecd秒前'; } else { timeshow = '刚刚'; } return timeshow; }

Dart开发基础：数字类型（num）常用方法 补充：toStringAsFixed(保留位数)一，部分属性用法一（figureA）int figureA = -93;是否为负数print(figureA.isNegative);figureA是否是有限的print(figureA.isFinite);figureA是否正无穷大或负无穷大 print(figureA.isInfinite);用法二（figureB）double figureB = 64.742;返回figureB的符号，-1.0:值小于0、+1.0:值大于0、-0.0/0.0/NaN:值是其本身print(figureB.sign);返回figureB运行时的类型print(figureB.runtimeType);返回figureB的哈希码print(figureB.hashCode);用法三（figureC）int figureC = 13;figureC是否为奇数print(figureC.isOdd);figureC是否为偶数print(figureC.isEven);返回figureC所占存储位print(figureC.bitLength);二，常用方法用法一（figureA）int figureA = -93;返回figureA的绝对值print(figureA.abs());返回figureA的字符串print(figureA.toString());用法二（figureB）double figureB = 64.742;返回figureB的整数值print(figureB.toInt());返回figureB的双精度值print(figureB.toDouble());返回大于figureB的双精度值print(figureB.ceilToDouble());返回小于figureB的双精度值print(figureB.floorToDouble());返回figureB四舍五入的双精度值print(figureB.roundToDouble());返回figureB保留几位小数的字符串print(figureB.toStringAsFixed(2));返回figureB保留几位小数后精确结果的字符串print(figureB.toStringAsPrecision(3));用法三（figureC）int figureC = 31;figureC对比其他整数，0:相同、1:大于、-1:小于print(figureC.compareTo(20));将figureC控制在指定区间的整数print(figureC.clamp(20, 25)); 返回figureC转换成指定基数(进制)的字符串print(figureC.toRadixString(16));用法四（figureD）int figureD = 12;返回figureD与其他整数的最大公约数print(figureD.gcd(18));返回figureDg与其他整数的截取余数print(figureD.remainder(18));返回figureD几次幂值的字符串print(figureD.toStringAsExponential(2));1 abs 返回数字的绝对值。2 ceil 返回不小于该数字的最小整数。3 compareTo 将此与其他数字进行比较。4 floor 返回不大于当前数字的最大整数。5 remainder 除以两个数后，返回截断的余数。6 round 返回最接近当前数字的整数。7 toDouble 返回数字的double等效值。8 toInt 返回数字的int等效值。9 toString 返回数字的字符串等效表示形式。10 truncate 丢弃小数位后返回一个整数。

弹窗样式 firstIntoKol() { showDialog( context: context, builder: (context) => SafeArea( child: Dialog( alignment: Alignment.center, backgroundColor: Colors.transparent, elevation: 0, insetAnimationCurve: Curves.easeInToLinear, child: Column( children: [ Container( width: 400.w, height: 600.h, decoration: BoxDecoration( color: appcolor.white, borderRadius: BorderRadius.circular(12), ), child: Column( crossAxisAlignment: CrossAxisAlignment.start, children: [ Padding( padding: EdgeInsets.only(left: 16.w, right: 16.w, top: 12.h), child: Text( apptext.whatkol, style: TextStyle( fontWeight: FontWeight.bold, fontSize: 15.sp), ), ), SizedBox( height: 3.h, ), Padding( padding: EdgeInsets.only(left: 16.w, right: 16.w), child: Column( crossAxisAlignment: CrossAxisAlignment.start, children: apptext.kolques.map((e) => Text('$e')).toList(), ), ), SizedBox( height: 8.h, ), ], ), ), SizedBox( height: 20.h, ), GestureDetector( onTap: () { Get.back(); }, child: Container( alignment: Alignment.center, width: 35.w, height: 35.h, child: Image.asset( 'assets/logo/chose.png', color: appcolor.white, ), ), ), ], ), ), ), ); }

隐藏安卓模拟器的虚拟键 1.找到指定的AVD模拟器的配置文件，一般路径如下：用户根目录/.android/avd/模拟器名字.avd/config.ini2.将下面两个属性改为yes即可hw.dPad=yeshw.mainKeys=yes3.重启模拟器

Android常用权限 <uses-permission android:name="android.permission.VIBRATE"/> <uses-permission android:name="android.permission.READ_PHONE_STATE" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />