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App Inventor 2 复制屏幕功能，误删组件的“后悔药”，界面设计更便捷 - Ap...
...可查看发布日志。
下面演示一下屏幕的复制效果：
1、Screen1屏幕上有若干组件、及一个SQLite拓展：
2、点击工具栏上的“复制屏幕”按钮，输入新屏幕名称：
3、复制后的Screen2：
4、代码块也一并成功复制，且代码块中...
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...
How to add a touch event to a UIView?
... the handler for a UIPanGestureRecognizer for dragging the view around the screen.
– Nathan Eror
May 15 '12 at 17:10
5
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What is the benefit of using Fragments in Android, rather than Views?
...pe mode on a phone: e.g. you show the list of items and the details on one screen. on a phone or in portrait mode you just show one part.
Another use case are reusable views. So if you have some views that are visible on different activities and also perform some actions you could put this behavio...
How to get the browser viewport dimensions?
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different screen size variables/solutions live test: ryanve.com/lab/dimensions
– Alex Pandrea
Jun 4 '19 at 11:34
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How to take emulator screenshots using Eclipse?
I need to take screenshots of an android application running on an emulator in Eclipse Galileo.
6 Answers
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Why not use tables for layout in HTML? [closed]
...rements.
Another thing. Table layout makes automated parsing of websites (screen scraping) much harder. This might sound trivial because, after all, who does it? I was surprised myself. Screen scraping can help a lot if the service in question doesn't offer a WebService alternative to access its da...
How do I disable orientation change on Android?
... that I just would like to use in portrait mode, so I have defined
android:screenOrientation="portrait" in the manifest XML. This works OK for the HTC Magic phone (and prevents orientation changes on other phones as well).
...
How to use UIScrollView in Storyboard
..., I've found a very easy way to put contents into scrollviews that are 'offscreen'. Tested with XCode 5 & iOS 7. You can do this almost entirely in Storyboard, using 2 small tricks/workarounds :
Drag a viewcontroller onto your storyboard.
Drag a scrollView on this viewController, for the demo ...
Explaining difference between automaticallyAdjustsScrollViewInsets, extendedLayoutIncludesOpaqueBars
...
Starting in iOS7, the view controllers use full-screen layout by default. At the same time, you have more control over how it lays out its views, and that's done with those properties:
edgesForExtendedLayout
Basically, with this property you set which sides of your view ...