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ComponentGroup 组件组扩展：监控内容变化和批量启用禁用组件 · App Inventor 2 中文网
... Button
按钮
Switch
开关
Slider
滑块
Spinner
下拉选择器
DatePicker
日期选择器
ContactPicker
联系人选择器
PhoneNumberPicker
电话号码选...
App Inventor 2 悬浮通知与导航栏教程 - NotificationStyle与Navbar扩展 · App Inventor 2 中文网
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概述
通知系统
通知渠道（Android 8+必需）
基本通知
大文本通知
带操作按钮的通知
进度条通知
底部导航栏
已有文档
配置导航栏
常见问题
Q1: Android ...
Eclipse: Set maximum line length for auto formatting?
...t the profile. Under the Line Wrapping tab is the primary option for line width (Maximum line width:). In the Comments tab you have a separate option Maximum line width for comments:, which will also need to be changed to affect comment wrapping.
You will need to make your own profile to make these...
When exactly is it leak safe to use (anonymous) inner classes?
I have been reading some articles on memory leaks in Android and watched this interesting video from Google I/O on the subject .
...
What C++ Smart Pointer Implementations are available?
...erhaps one of the originals it suffered from first draft syndrome only providing limited garbage collection facilities. The first downside being that it calls delete upon destruction making them unacceptable for holding array allocated objects (new[]). It takes ownership of the pointer so two auto p...
Java EE 6 @javax.annotation.ManagedBean vs. @javax.inject.Named vs. @javax.faces.ManagedBean
...ey made JSF managed beans and another container for JSF beans and they considered it a mature DI container, but still it was not complete and mature container.
After that Gavin King and some other nice guys ;) made CDI which is the most mature DI container I've seen. CDI (inspired by Seam2, Guice a...
UnicodeDecodeError when redirecting to file
...to the ubiquitous UTF-8, but this is incorrect terminology, as Unicode provides multiple encodings).
In summary, computers need to internally represent characters with bytes, and they do so through two operations:
Encoding: characters → bytes
Decoding: bytes → characters
Some encodings canno...
My Understanding of HTTP Polling, Long Polling, HTTP Streaming and WebSockets
...
There are more differences than the ones you have identified.
Duplex/directional:
Uni-directional: HTTP poll, long poll, streaming.
Bi-direcitonal: WebSockets, plugin networking
In order of increasing latency (approximate):
WebSockets
Plugin networking
HTTP streaming
...
Why does Python code run faster in a function?
... (LOAD_GLOBAL), which is a true dict search involving a hash and so on. Incidentally, this is why you need to specify global i if you want it to be global: if you ever assign to a variable inside a scope, the compiler will issue STORE_FASTs for its access unless you tell it not to.
By the way, glob...
App Inventor 2 OCR文字识别教程 - 百度云与本地识别方案 · App Inventor 2 中文网
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1. 获取API Key
访问 https://cloud.baidu.com/doc/OCR/index.html
创建应用，获取 API Key 和 Secret Key
通用文字识别每月免费1000次
2. 获取Access Token
global 百度API_KEY = "your-api-key"
global 百度SECRET_KEY =...