Q：APP Inventor 空字符串怎么表示？ A：文本下的字符串，不填写任何内容，就是空字符串。 详见文档：https://www.fun123.cn/reference/blocks/text.html#string

Q：如何设置App不随着屏幕旋转而旋转？ A：Screen1 的属性中设置屏幕方向为“锁定竖屏”就可以啦！ 学习到了！！

Q：电脑上的文件如何拷贝到模拟器中？ A：文件拷贝的具体步骤如下（这里以mumu模拟器为例展示，其他的模拟器也都是大同小异）：模拟器菜单，文件传输功能：打开模拟器与电脑的共享目录：将想要传输的文件拷贝到共享目...

Q：AppInventor2画布的坐标原点在哪里，是中心吗？ A：画布的左上边缘是 0,0 原点。

Q：AppInventor2画布拖动事件中 起点、前点、当前点，都是啥意思？ A： 起点：第一次触摸屏幕的位置。 前点：最后一次拖动前的位置。 当前点：当前拖动后最新的位置。 详见中文文档：https://www.fun123.cn/reference/ ... html#Canvas...

...of a branch, it's rather like finding a needle in a haystack. You can find all the commits that don't appear to be referenced any more- git fsck --unreachable will do this for you- but that will include commits that you threw away after a git commit --amend, old commits on branches that you rebased ...

... That looked like just what I was after to disable all my input fields but, although it blocks them from mouse events, they can still be accessed and changed using keyboard tab – Ken Oct 20 '15 at 15:18 ...

I wonder, what's the easiest way to delete a directory with all its files in it? 33 Answers ...

...database DROP – delete objects from the database TRUNCATE – remove all records from a table, including all spaces allocated for the records are removed COMMENT – add comments to the data dictionary RENAME – rename an object DML DML is short name of Data Manipulation Lang...

I have two directories with the same list of files. I need to compare all the files present in both the directories using the diff command. Is there a simple command line option to do it, or do I have to write a shell script to get the file listing and then iterate through them? ...