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https://bbs.tsingfun.com/thread-2634-1-1.html 

为什么“Screen1.初始化”方法报错? - App应用开发 - 清泛IT社区,为创新赋能!

Q:为什么“Screen1.初始化”方法报错? A:可以点击红色叉叉查看报错具体原因。不过这里一看就是方法重复定义导致。也就是有两个这个方法,去掉一个就行了。
https://bbs.tsingfun.com/thread-2655-1-1.html 

有没有滑动选择框拓展? - App Inventor 2 拓展 - 清泛IT社区,为创新赋能!

Q: 有类似这种滑动选择相关拓展吗?
https://bbs.tsingfun.com/thread-2656-1-1.html 

WheelView:滚轮选择框扩展 - App Inventor 2 拓展 - 清泛IT社区,为创新赋能!

...ny strings.original code from WheelView: 效果类似android4.0以上原生DatePicker 18Thanks @wildcontrol to sponsor this extensionDemo picture:this demo used 3 extensionsAll the blocks 来源:https://wangsk789.github.io/wheelview/ 更多滚轮拓展见:https://www.fun123.cn/reference/ .....
https://bbs.tsingfun.com/thread-2693-1-1.html 

AppInventor2如何请求MANAGE_EXTERNAL_STORAGE权限? - App应用开发 - 清泛...

...目录访问权限,文件需要保存在根目录任意位置,不是APP私有目录 [hide]A:权限名称换成:MANAGE_EXTERNAL_STORAGE 内部会拼成完整安卓权限包名:android.permission.MANAGE_EXTERNAL_STORAGE 在2个事件中输出信息查看权限授权是否成功...
https://bbs.tsingfun.com/thread-2702-1-1.html 

app inventor 2 有HexToString组件吗? - App Inventor 2 中文网 - 清泛IT社区,为创新赋能!

同这篇帖子《什么是 Hex 编码方式?》:https://bbs.tsingfun.com/thread-2700-1-1.html 使用 ByteArray 拓展 ToHex 方法可以实现将无符号数字转换为其十六进制表示。
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Writing string to a file on a new line every time

...se file.write(str(a)+'\n') – 未来陆家嘴顶尖投资人 May 4 '17 at 6:43 ...
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How to convert a string to utf-8 in Python

...rying to print unicode and was getting �s. – 智障人 Feb 7 '16 at 17:53 How to you convert u back to a str form...
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ViewPager.setOffscreenPageLimit(0) doesn't work as expected

...protected boolean isVisible; /** * 在这里实现Fragment数据缓加载. * @param isVisibleToUser */ @Override public void setUserVisibleHint(boolean isVisibleToUser) { super.setUserVisibleHint(isVisibleToUser); if(getUserVisibleHint()) { ...
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计算统计特征(正态分布)函数及实例 - C/C++ - 清泛网 - 专注C/C++及内核技术

...def _UTILITY_STDEV_H_ #define _UTILITY_STDEV_H_ /* * 计算统计特征函数 */ #define _USE_MATH_DEFINES #include <algorithm> #include <math.h> #include <float.h> #include <crtdbg.h> #include <vector> struct StdevInfo { static const double MAX_VAR; double _ave; //doub...
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How can I validate a string to only allow alphanumeric characters in it?

...o true for "letters" other than a-zA-Z. For example, Japanese あ, Chinese , Korean 한 etc are considered to be Unicode "letters". If this is your intention, then fine, but judging from the various regex expressions in the other answers, this is likely not what most considered to be alpha[numeri...