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ActionBar 拓展：溢出菜单 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...统菜单事件来实现自定义内容哦！
✅ 实现方法：使用 Screen 的 OptionsMenu 相关事件
App Inventor 提供了两个关键事件来操作右上角菜单：
1. 当屏幕创建菜单时：Screen.Initialize 或 Screen.CreateOptionsMenu
在这里你可以添加菜单项。
2...
GestureDetector 手势检测拓展：旋转、缩放和滑动手势检测，自定义手势识别...
...nvas 画布组件
拖入 RotationDetector 或 ScaleDetector 组件
在 Screen.Initialize 中调用 AddHandlerToCanvas(Canvas1) 绑定
滑动/点击（绑定到任意可视组件）：
拖入 SwipeDetector 组件
在 Screen.Initialize 中调用 AddHandler(组件) 绑定到任意可视组...
KeepScreenOn 拓展：保持屏幕常亮不息屏 · App Inventor 2 中文网
... 搜索 KeepScreenOn 拓展：保持屏幕常亮不息屏
KeepScreenOn 拓展
使用说明
属性
事件
方法
示例
« 返回首页
KeepScreenO...
语音导游 · App Inventor 2 中文网
...
10. 查看地点详情页
工程已经准备了第二个屏幕 LocationScreen。打开它，再切换到设计器，先观察这个屏幕已有的界面布局。
11. 认识地点屏幕布局
和伙伴一起辨认地点屏幕中的标签、图片、朗读器和返回按钮，想一想每个...
How to apply specific CSS rules to Chrome only?
...kit-min-device-pixel-ratio:0) {
div{top:10;}
}
/* Chrome 29+ */
@media screen and (-webkit-min-device-pixel-ratio:0)
and (min-resolution:.001dpcm) {
div{top:0;}
}
/* Chrome 22-28 */
@media screen and(-webkit-min-device-pixel-ratio:0) {
.selector {-chrome-:only(;
property:value;
...
Detecting that the browser has no mouse and is touch-only
...ing text) with a very different interface for touch (your finger hides the screen when you click) and mouse (relies heavily on hover preview).
How can I detect that my user has no mouse to present him the right interface? I plan to leave a switch for people with both mouse and touch (like some noteb...
AI2 Media Notification
... ist ein kleiner Trick notwendig. Im Beispiel wird im OnClick-Ereignis ein Screen mit der Bezeichnung Dummy geöffnet. Dieser Screen schließt sich unmittelbar im Ereignis Screen.Initialize selbst wieder: A little trick is necessary to bring the app to the foreground when the event is triggered. In...
Assign width to half available screen width declaratively
Is it possible to assign a widget width to half the available screen width, and do it using declarative xml?
5 Answers
...
Android static object lifecycle
I am creating event search application, we set search criteria from one screen populate in another screen then user can edit search criteria from 3rd screen and goes to 4th screen.
...
Twitter bootstrap 3 two columns full height
...perties which we added) and with ratio 1:3 (Navigation:Content) for medium screen widths and above - (due to bootstrap's default classes: col-md-3 and col-md-9)
NB:
1) In order not to mess up bootstrap's native column classes we add another class like no-float in the markup and only set display:...