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使用照相机时老是弹出 error 201 : the camera d id not return an image ...
问题来自B站：https://message.bilibili.com/?spm_id_from=333.1007.0.0#/reply
解决方法：
1、很可能删除了 “Pictures“ 图片文件夹：/storage/emulated/0/Pictures，这个文件夹不能被相机组件自动创建。
2、官方确认这是一个bug，已修复。确认一下...
BrightnessTools 拓展：设置手机亮度的工具 · App Inventor 2 中文网
... 0 = 亮度变化，
1 = 自适应变化
brightness
Number (int)
返回当前亮度。
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【二进制】UrsAI2ByteArray 字节数组扩展：读写二进制数据，二进制文件读写...
来源：https://www.fun123.cn/reference/iot/bytearray.html
功能概述 字节数组扩展允许对存储的数据进行顺序和随机访问。随机访问的索引基址（第一个元素的索引）可以使用Base属性设置。可能的值为1（App Inventor中常用）或0（Java或C中常...
Imitate Facebook hide/show expanding/contracting Navigation Bar
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The solution given by @peerless is a great start, but it only kicks off an animation whenever ...
How can I delay a method call for 1 second?
Is there an easy way delay a method call for 1 second?
11 Answers
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How to detect the OS from a Bash script?
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21 Answers
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Debugging Scala code with simple-build-tool (sbt) and IntelliJ
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14 Answers
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How do I deep copy a DateTime object?
Now $date1 and $date2 contain the same date -- three years from now. I'd like to create two separate datetimes, one which is parsed from a string and one with three years added to it. Currently I've hacked it up like this:
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“var” or no “var” in JavaScript's “for-in” loop?
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Use var, it reduces the scope of the variable otherwise the variable looks up to the nearest c...