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App Inventor 2 MenuSlide 拓展：滑动菜单效果 · App Inventor 2 中文网
...距；用户点击菜单项时，根据 index 切换页面内容：
when Screen1.Initialize() {
MenuSlide1.Count = 3
MenuSlide1.TextSize = 14
MenuSlide1.FontScale = 1
MenuSlide1.Gap = 16
MenuSlide1.Create(水平布局_菜单)
}
when MenuSlide1.OnClickCircleText(index, text) {
标签_...
App Inventor 2 项目合并工具：合并屏幕、合并素材、合并拓展 · App Inventor 2 中文网
...合并的屏幕、资源、拓展等。
注意：两边如果同时选中Screen1，会提醒将右边的屏幕改名后合并到最终的项目。
合并完成，保存 merged.aia 文件到本地。
合并完成验证
上面合并后的 merged.aia 导入到App Inventor 2...
Error 908: The permission RECORD_AUDIO has been denied · App Inventor 2 中文网
... been denied
报错截图
原因：Screen中请求”声音”权限后，弹出权限请求对话框，选择了拒绝导致的。
此时的麦克风权限是禁止的：
解决方法
打开App的设置，重新赋予麦克风的...
App Inventor 2 地图与电子围栏教程 - LocationSensor与地图组件 · App Inventor 2 中文网
...
显示地图并定位到指定位置
when Screen1.Initialize() {
Map1.CenterFromString = "39.9042,116.4074" // 北京天安门
Map1.ZoomLevel = 15
Map1.ShowUser = True
}
关联LocationSensor自动定位
when Screen1.Initialize() {
M...
Arduino101 按钮 · App Inventor 2 中文网
...回true，则调用TurnOn和TurnOff应该能正常工作。否则会通过Screen的ErrorOccurred事件报告错误。
ReadButtonState - 读取Arduino报告的按钮当前状态。成功时，将触发ButtonStateReceived事件。如果按钮状态发生变化，还会触发Pressed或Released...
Difference between SurfaceView and View?
... VSYNC is to consider it is as a timer that fire up every 16ms for a 60fps screen. In Android, all the normal view update (and display actually but I won't talk it today), is synchronized with VSYNC to achieve better smoothness. Now,back to the surfaceView, you can render it anytime as you wish. How...
App Inventor 2 SliderVertical 扩展：垂直的滑动条 · App Inventor 2 中文网
...扩展添加到项目后，把垂直滑块放在控制面板中：
when Screen1.Initialize() {
SliderVertical1.SliderVertical(垂直布局_滑块)
SliderVertical1.MinValue = 0
SliderVertical1.MaxValue = 100
SliderVertical1.ThumbPosition = 50
}
when SliderVertical1.PositionChanged(thumbPosi...
How to programmatically get iOS status bar height
...work connection) at the top of the iPhone/iPad is 20 pixels for non-retina screens and 40 pixels for retina screens, but to future proof my app I would like to be able to determine this without hard coding values. Is it possible to figure out the height of the status bar programmatically?
...
手机当上位机：用二进制协议和设备收发数据 · App Inventor 2 中文网
...p 就连接，点按钮把「读温湿度」命令拼好发出去。
when Screen1.Initialize() {
Socket客户端1.Connect()
}
when 按钮_读取.Click() {
var 帧 = 二进制1.AppendChecksum(二进制1.Build([165, 90, 1, 1]), "SUM8")
Socket客户端1.SendBytes(帧)
标签_发送.Text = joi...
Formula px to dp, dp to px android
...owever, the docs explain that this value is a rounded value, used with the screen 'buckets'. Eg. on my Nexus 10 it returns 2, where the real value would be 298dpi (real) / 160dpi (default) = 1.8625.
Depending on your requirements, you might need the exact transformation, which can be achieved like...