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App Inventor 2 语音合成与语音唤醒教程 · App Inventor 2 中文网
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选择TTS引擎
when Screen1.Initialize() {
var 引擎列表 = 文本朗读器1.AvailableLanguages
Spinner_引擎.Elements = 引擎列表
}
when Spinner_引擎.AfterSelecting(选中项) {
文本朗读器1.Language = 选中项
}
语音识别
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字符串比较 · 组件速查 · App Inventor 2 中文网
...谜题，并判断用户输入的答案是否正确。显示随机消息从列表中随机选一项，并把它显示在标签上。展开列表使用代码块齿轮，为列表增加更多项目。
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摩尔斯电码 · 组件速查 · App Inventor 2 中文网
...输入和目标文本，再根据结果执行操作。显示随机消息从列表中随机选一项，并把它显示在标签上。展开列表使用代码块齿轮，为列表增加更多项目。
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终于不用拿复选框凑了：App Inventor 新组件「单选框」，问卷表单一个搞定 ...
...分隔填，比如 男,女,保密；
也可以在代码里设置「元素列表」；
勾选「横向排列」，选项排成一行，适合短选项。
用户点选后触发「选择完成时」事件，选中的文字在参数里。
▲ 横向排列的单选项（示意图）
案例...
Convert number strings with commas in pandas DataFrame to float
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If you're reading in from csv then you can use the thousands arg:
df.read_csv('foo.tsv', sep='\t', thousands=',')
This method is likely to be more efficient than performing the operation as a separate step.
You need to set the locale first:
In ...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 - App Invent...
...如下：
扫描蓝牙设备，代码如下：
扫描完成后，设备列表展示到“列表显示框”组件中：
点击列表中的目标设备（一般硬件文档会有说明，名称会有特别的标识），连接蓝牙设备的代码如下：蓝牙App控制硬件开始控制硬件相...
How to save a data.frame in R?
... take into account as well. I typically have a section of processing some .csv files and once I get them where I like them, I prefer to save them so I don't have to re-run that code every time I re-visit my project. So, preserving that work/tweaks to the structure is important to consider.
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SwipeRefresh 拓展：下拉刷新 · App Inventor 2 中文网
... 布局：要注册的垂直滚动布局
RegisterListView注册列表(列表)
把一个 ListView 注册为下拉刷新区域。
列表：要注册的 ListView 组件
CancelRefreshing取消刷新状态()
数据加载完成后调用，收起刷新指示圈。
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What is a domain specific language? Anybody using it? And in what way?
...ut do not fit the problem such as HTML that was used to define Data (XML). CSV is very useful, it fits most problems. JSON does not fit the ease of use portion, it is overkill that adds unnecessary complications were CSV works for most problem. We use EXCEL a lot for DSL, it works great for describi...
Best practice using NSLocalizedString
...ultiple sheets, and more).
In short, steps are: Google Spreadsheet --> CSV files --> Localizable.strings
Moreover, it also generates Localizables.swift, a struct that acts like interfaces to a key retrieval & decoding for you (You have to manually specify a way to decode String from key ...