public class 分派 { public static void main(String[] args) { Human man = new Man(); // 重写是 虚函数的源由（invokevirtual 所以对字段无效），看实际类型 即‘后者’ man.printCode(); // man.code是不是方法，所以输出是 Huma…

1. 定义NotificationListener Widget wrapWithNotify(Widget child){ return NotificationListener<ScrollNotification>( child: child, onNotification: handleNotification, ); } 2.…

import 'package:flutter/material.dart'; class CalendarWidget extends StatefulWidget { // 选择器范围 DateTime startTime; DateTime endTime; // 日期文本字体大小 TextStyle? style; // 头部 周文本样式 …

1. 调用处 import 'dart:async'; import 'package:flutter/material.dart'; import 'package:plano_flutter/helpers/router/flutter_binding.dart'; import 'package:plano_flutter/models/ev…

1. FlutterBoost源码 FlutterBoostApp->pop方法 Future<bool> pop( {String? uniqueId, Object? result, bool onBackPressed = false}) async { BoostContainer? container; if (uniqueI…

1. physics方式 ClampingScrollPhysics() 强制将滚动距离限制最大可滑动 2. 自定义ScrollBehavior class NoScrollBehaviorWidget extends ScrollBehavior { @override Widget buildViewportChrome(BuildContex…

1. FractionallySizedBox 通过更改width/heightFactor来实现类似滚动进度条 Row( children: [ Flexible( child: FractionallySizedBox( widthFactor: 1.0, child: Container( width: 20, height: 20, col…

1. Scroller public void fling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY, int maxY) {} public void startScrollBy(int dx,int dy) { mScro…

// val h = (img.width * 1.0f / img.drawable.intrinsicWidth * img.drawable.intrinsicHeight).toInt() // val animator = ValueAnimator.ofInt(img.height,h) public class LiveImageVi…

public class CustomImageView extends AppCompatImageView implements View.OnTouchListener { private float lastX, lastY; private int screenWidth, screenHeight; private int imageW…