App教程 帮助 应用介绍 做一个趣味App，模拟打字机效果，在屏幕上一个一个汉字蹦出，同时播放打字机的音效，非常有趣，小朋友们快来试试吧！ 打字机效果视频教程1 / 3 打字机效果视频教程2 / 3 打...

问：怎么选择并打开一个文本文件？有例子吗 答复： [hide] 使用“数据存储组件” -> "文件管理器"组件。 思路如下： 问：这个文件管理器只能打开已经上传的文件，我想打开手机上的某一个文本文件并读...

问：App Inventor如何取文本每一个字符进行运算？ 答： [hide]1、拿出文本的长度，进行循环，然后用文本.截取方法，拿出每一个字符，比如某个字母'a'。 文档：https://www.fun123.cn/reference/blocks/text.html#segment 2、要看具体的每个...

在做BLE蓝牙显示app。蓝牙端一个数据一个数据的发送，但是显示的时候后一个会覆盖上一个 无法将接收的数据全部罗列出来，而且显示的还有问题，有时候显示一个，有时候显示3个数据。求解！！使用列表显示框组件，详见文...

GridCtrl 控件FAQ目录GridCtrlEx控件FAQ.. 11. 一个固定用法... 12. 可以控制单元格是否可以编辑... 33. 在选定一个单元格时，选择整行... 34. 说明... 目录 1. 一个固定用法... 1 2. 可以控制单元格是否可以编辑... 3 3. 在选定一个单元格...

... reader is to be able to read the book without having to crane the neck. A screen is typically not placed at the distance of a book, which means more characters per line can be used while keeping within the limits of the maximum eye angle. Also, code isn't read as much as it is perused, making this ...

...d:name=".YourActivity" android:configChanges="orientation" android:screenOrientation="portrait"/> Let me explain: With android:configChanges="orientation" you tell Android that you will be responsible of the changes of orientation. android:screenOrientation="portrait" you set the defa...

I know that Activities are designed to represent a single screen of my application, while Fragments are designed to be reusable UI layouts with logic embedded inside of them. ...

...e, but which is always roughly square) and display it so that it fills the screen horizontally, and stretches vertically to maintain the aspect ratio of the image, on any screen size. Here is my (non-working) code. It stretches the image horizontally, but not vertically, so it is squashed... ...

... Unfortunately not very helpful for me, it messes up the screen and I have to press Ctrl-L... which is even more annoying than pressing space. – Johan Kotlinski May 20 '09 at 23:59 ...