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LEGO EV3 机器人传感器面板 · App Inventor 2 中文网
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颜色传感器
输出光线强度（0-100）或物体颜色代码
超声波传感器
测量距离（厘米/英寸）
红外传感器
接收红外遥控器消息
触碰传感器
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HTTP vs HTTPS performance
Are there any major differences in performance between http and https? I seem to recall reading that HTTPS can be a fifth as fast as HTTP. Is this valid with the current generation webservers/browsers? If so, are there any whitepapers to support it?
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How to get current foreground activity context in android?
Whenever my broadcast is executed I want to show alert to foreground activity.
14 Answers
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How to parse JSON in Java
I have the following JSON text. How can I parse it to get the values of pageName , pagePic , post_id , etc.?
34 Answers
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How to get the current time in Python
What is the module/method used to get the current time?
42 Answers
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Type List vs type ArrayList in Java [duplicate]
I understand that with (1), implementations of the List interface can be swapped. It seems that (1) is typically used in an application regardless of need (myself I always use this).
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Does every Core Data Relationship have to have an Inverse?
Let's say I have two Entity classes: SocialApp and SocialAppType
8 Answers
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What are the differences between “generic” types in C++ and Java?
Java has generics and C++ provides a very strong programming model with template s.
So then, what is the difference between C++ and Java generics?
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How to write to a file in Scala?
For reading, there is the useful abstraction Source . How can I write lines to a text file?
18 Answers
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How do ACID and database transactions work?
What is the relationship between ACID and database transaction?
8 Answers
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