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https://bbs.tsingfun.com/thread-1531-1-1.html 

App Inventor 2 文本.合并字符串引号问题 - App Inventor 2 文网 - 清...

...,应该间还有两个引号。你可以验证一下。 经测试,确如此: 问:那有办法去掉吗? 答: 问:就是我只想去掉开头引号,但是我不想去掉引号 答:那就只能判断文本第一个字符是否是引号,再截取...
https://bbs.tsingfun.com/thread-1583-1-1.html 

appinventor2 生成APP没有标题栏? - App Inventor 2 文网 - 清泛IT社区,为创新赋能!

AI伴侣: 编译apk后: 基本确定是ai2或者Android系统bug,可能是部分机型/安卓系统版本才会出现,不过官方目前还没修复。 https://community.appinventor.mi ... reated-app/100233/6 目前可以通过选择“经典模式”主题,临时规避该问...
https://www.tsingfun.com/it/ai2/2718.html 

App Inventor 2 如何比较两个日期/时间? - App Inventor 2 文网 - 清泛...

App Inventor 2 如何比较两个日期/时间?利用计时器组件相关方法:比较两个日期/时间对象毫秒数,具体请参见文档:https://www.fun123.cn/reference/ ... tml#Clock.GetMillis即时时间获取方法:1、日期/时间选择...利用计时器组件相关...
https://bbs.tsingfun.com/thread-1788-1-1.html 

有没有关于CRC校验扩展? - App Inventor 2 拓展 - 清泛IT社区,为创新赋能!

...进行二进制运算功能有限,可不可以开发一个进行CRC校验扩展,这样做工业网络控制就简单得多。这个需求比较通用,应该是有现成 CRC 拓展,我稍后找一下再上传{:8_384:}参考:https://community.appinventor.mit.edu/t/can-someone-help-me-r...
https://bbs.tsingfun.com/thread-1806-1-1.html 

各位大佬,用蓝牙bleWriteBytes模块发送到单片机能进断但是没数据,是...

各位大佬,用蓝牙bleWriteBytes模块发送到单片机能进断但是没数据,是什么原因 函数用法没有问题,数据应该是发送到了蓝牙设备,至于为什么没数据,需要自行打印内容进行一步步排查。建议提供更详细描述信息以及...
https://bbs.tsingfun.com/thread-1858-1-1.html 

app inventor如何实现手机熄屏和打开屏幕 - App Inventor 2 拓展 - 清泛I...

想通过app上按钮来实现开关屏幕息屏/条件触发开屏可以参考这个拓展,调整手机屏幕亮度拓展,请自行研究一下,谢谢 https://bbs.tsingfun.com/thread-1862-1-1.html 保持屏幕常亮不息屏参考这个拓展: https://bbs.tsingfun.com/thread-1861...
https://bbs.tsingfun.com/thread-2561-1-1.html 

AppInventor2画布坐标原点是哪里? - App应用开发 - 清泛IT社区,为创新赋能!

Q:AppInventor2画布坐标原点在哪里,是心吗? A:画布左上边缘是 0,0 原点。
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static allocation in java - heap, stack and permanent generation

I have been lately reading a lot on memory allocation schemes in java, and there have been many doubts as I have been reading from various sources. I have collected my concepts, and I would request to go through all of the points and comment on them. I came to know that memory allocation is JVM spec...
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How do I initialize a byte array in Java?

I have to store some constant values (UUIDs) in byte array form in java, and I'm wondering what the best way to initialize those static arrays would be. This is how I'm currently doing it, but I feel like there must be a better way. ...
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Java serialization: readObject() vs. readResolve()

The book Effective Java and other sources provide a pretty good explanation on how and when to use the readObject() method when working with serializable Java classes. The readResolve() method, on the other hand, remains a bit of a mystery. Basically all documents I found either mention only one o...