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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...
...情可查看发布日志。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，且代码块中的屏幕名自...
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...
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?
...
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...
select、poll、epoll之间的区别总结[整理] - C/C++ - 清泛网 - 专注C/C++及内核技术
...很多时也很大
（3）select支持的文件描述符数量太小了，默认是1024
2 poll实现
poll的实现和select非常相似，只是描述fd集合的方式不同，poll使用pollfd结构而不是select的fd_set结构，其他的都差不多。
关于select和poll的实现分析，可...
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).
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开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
...便用户灵活管理客户端的连接与访问。数据集成Mosquitto 默认通过 MQTT 客户端消息订阅方式实现外部系统对数据的消费。此外，Mosquitto 提供了多个 Mosquitto 之间的数据桥接能力，可以用于多个 broker 之间的分布式部署与数据打通。...