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App Inventor 2 数据可视化教程 - 折线图/曲线图/实时数据绘图 · App Inventor 2 中文网
...导入
// 先发起网络请求
Web客户端1.Get("https://api.example.com/data.json")
// 在 Web客户端1.收到内容 事件中
when Web客户端1.GotText(url, 响应代码, 响应类型, 响应内容) {
二维图表数据1.ImportFromWeb(Web客户端1, "time", "value")
}
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How to reliably guess the encoding between MacRoman, CP1252, Latin1, UTF-8, and ASCII
... annotation. Still an embarassing oversight not to have it in the standard API.
– Michael Borgwardt
Nov 16 '10 at 21:11
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Sanitizing strings to make them URL and filename safe?
...n in general
OWASP have a PHP implementation of their Enterprise Security API which among other things includes methods for safe encoding and decoding input and output in your application.
The Encoder interface provides:
canonicalize (string $input, [bool $strict = true])
decodeFromBase64 (strin...
How do I create a right click context menu in Java Swing?
... is a bit old - as are the answers (and the tutorial as well)
The current api for setting a popupMenu in Swing is
myComponent.setComponentPopupMenu(myPopupMenu);
This way it will be shown automagically, both for mouse and keyboard triggers (the latter depends on LAF). Plus, it supports re-using ...
What's the difference between SoftReference and WeakReference in Java?
...
Weak Reference
http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/ref/WeakReference.html
Principle: weak reference is related to garbage collection. Normally, object having one or more reference will not be eligible for garbage collection.
The above principle is not applicabl...
What is “lifting” in Scala?
...rovides unlift to help with construction of JSON serialisers:
import play.api.libs.json._
import play.api.libs.functional.syntax._
case class Location(lat: Double, long: Double)
implicit val locationWrites: Writes[Location] = (
(JsPath \ "lat").write[Double] and
(JsPath \ "long").write[Double...
Payment Processors - What do I need to know if I want to accept credit cards on my website? [closed]
... The payment gateway vendors provide a way to talk to the Internet Gateway API that you will communicate with. Most vendors provide HTTP or TCP/IP communication with their API. They will process the credit card information on your behalf. Two vendors are Authorize.Net and PayFlow Pro. The link I...
Android: Difference between Parcelable and Serializable?
...pose serialization mechanism. This class (and the corresponding Parcelable API for placing arbitrary objects into a Parcel) is designed as a high-performance IPC transport. As such, it is not appropriate to place any Parcel data in to persistent storage: changes in the underlying implementation of a...
Understanding implicit in Scala
...
Actions are explained on this page from the Play documentation (see also API docs). You are using
apply(block: (Request[AnyContent]) ⇒ Result): Action[AnyContent]
on the Action object (which is the companion to the trait of the same name).
So we need to supply a Function as the argument, wh...
Where should I put tags in HTML markup?
...using external scripts that support callbacks. Many third party JavaScript APIs now support non-blocking execution. Here is an example of loading the Google Maps API asynchronously.
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