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我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑"，手机一划车就...
周五晚上，儿子抱着他那辆吃灰半年的遥控车跑来问我："爸爸，能不能让手机控制它？我想躺在床上就能让它跑。"看着他期待的眼神，我决定用App Inventor 2的蓝牙组件试试。没想到两小时就搞定了，而且连接稳定性和操...
What's the opposite of 'make install', i.e. how do you uninstall a library in Linux?
...he other packages. This is (one of many reasons) why package managers were invented.
– Merlyn Morgan-Graham
May 10 '13 at 0:41
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App Inventor 2 能否实现后台推送通知？源码级深度调研 - App应用开发 - 清...
背景：微信群用户提问
AI2 能否实现类似 uni-push 的后台推送通知？手机开机不打开 App 就能自动读取云端数据。
以下是源码级深度调研结果。
一、推送通知的工作原理
系统级推送（真推送）
服务器 -> FCM/APNs 云...
财务计算器拓展：复利计算、平均值、中位数、众数、方差计算 - App Invento...
Financial Calculator Extension
精心打造的“财务计算器”扩展，为您的Android应用程序增添先进的财务和统计功能。此扩展让您能够执行广泛的财务计算，从简单利息和复利到净现值和投资回报率。它还使您能够进行基本的统计计算...
微博为什么限制140字(附短信70字限制考) - 闲聊区 - 清泛IT社区，为创新赋能！
问题的提出申请过那么多的微博，数申请网易微博的动机最不纯，因为它的字数限制不是传说中的140字，而是163个字。当年觉得很可爱，于是就注册了，之后再也没登录过。今天在人人网转发状态，提示我超过140字了，突然就好...
Difference between abstraction and encapsulation?
...by how they behave (among other abstraction patterns). Abstraction was not invented by computer science, it is ancient - hieroglyphs are abstractions, words are abstractions, thoughts are abstractions. Encapsulation is likewise ancient (underwear, armor, boxes). You may be trying to make these conce...
How to fluently build JSON in Java?
...n-lib:
http://json-lib.sourceforge.net/
Douglas Crockford is the guy who invented JSON; his Java library is here:
http://www.json.org/java/
It sounds like the folks at json-lib picked up where Crockford left off. Both fully support JSON, both use (compatible, as far as I can tell) JSONObject, ...
What is the best way to filter a Java Collection?
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Yeah, but I hate to reinvent the wheel, again, repeatedly. I'd rather find some utility library that does when I want.
– Kevin Wong
Sep 25 '08 at 18:18
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离线版启动超时，有报错日志 - App Inventor 2 离线版 - 清泛IT社区，为创新赋能！
web服务启动报错：
Picked up JAVA_TOOL_OPTIONS: "-Dfile.encoding=UTF-8"
Executing [D:\appinventor\AppInventor2\resources\app.asar.unpacked\OpenJDK\bin\java, --add-opens=java.base/java.lang=ALL-UNNAMED, -Xmx4G, --add-opens, java.base/java.net=ALL-UNNAMED, --add-opens, java.base/sun.ne...
“unpacking” a tuple to call a matching function pointer
...t's worth echoing Walter's answer and comments thereon: folk don't need to invent their own wheels anymore. Generating a sequence was so common that it was standardised in C++14 as std::integer_sequence<T, N> and the specialisation thereof for std::size_t, std::index_sequence<N> - plus t...