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将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
...这些代码块的教程可以在此处找：
端口、接线和API
作为参考，前右电机是端口10，前左是端口11，后右是端口12，后左是端口13。超声波传感器已连接到端口36，亮度传感器设置为使用TwiMaster 1。
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How can I show ellipses on my TextView if it is greater than the 1 line?
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The way it worked for me on multiple devices / APIs was programmatically like this (where tv is your TextView):
if (tv.getLineCount() > 1) {
int lineEndIndex = tv.getLayout().getLineEnd(0);
String text = tv.getText().subSequence(0, lineEndIndex - 3...
Returning 'IList' vs 'ICollection' vs 'Collection'
...m confused about which collection type that I should return from my public API methods and properties.
6 Answers
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How would I run an async Task method synchronously?
...ften when they are not necessary. With MVC in particular, some ASP.NET/MVC APIs do assume that they have an AspNetSynchronizationContext, so this particular hack won't work if you're calling those APIs.
– Stephen Cleary
Jan 23 '14 at 12:33
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Get current clipboard content? [closed]
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Use the new clipboard API, via navigator.clipboard. It can be used like this:
navigator.clipboard.readText()
.then(text => {
console.log('Pasted content: ', text);
})
.catch(err => {
console.error('Failed to read clipboard cont...
Google Maps zoom control is messed up
I use the Google Maps API (v.3) to show a map with a couple of markers. I recently noticed that the control used to zoom the map is messed up (it wasn't always like this). I have no idea what the cause is.
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Why should I use Restify?
I had the requirement to build up a REST API in node.js and was looking for a more light-weight framework than express.js which probably avoids the unwanted features and would act like a custom-built framework for building REST APIs. Restify from its intro is recommended for the same case.
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Remove padding or margins from Google Charts
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By adding and tuning some configuration options listed in the API documentation, you can create a lot of different styles. For instance, here is a version that removes most of the extra blank space by setting the chartArea.width to 100% and chartArea.height to 80% and moving the legend...
Is “Java Concurrency In Practice” still valid? [closed]
...od software design and engineering than updates on the latest and greatest API's. This book has been indispensable, and I am glad that I got it before I had decided to write even a single line of concurrent code. It's probably saved me countless hours.
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How do I check which version of NumPy I'm using?
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This is not the public API, numpy.__version__ is.
– David Cournapeau
Nov 22 '11 at 10:10
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