大约有 3,774 项符合查询结果（耗时：0.0090秒） [XML]
GestureDetect 扩展：手势检测扩展，识别滑动、点击和长按手势 · App Inventor 2 中文网
...木块处理各种手势事件
配置示例
在 Screen1.Initialize 事件中：
当 Screen1.初始化
设置 GestureDetect1.布局 为 HorizontalArrangement1
事件
OnSwipeUp 上滑(组件)
当用户在指定组件上执行上滑手势时...
Android, ListView IllegalStateException: “The content of the adapter has changed but ListView did no
...
Here is my case specific code for others to refer.
My loader on the main screen loads the phone book contacts into my data sources in the background.
@Override
public Void loadInBackground() {
Log.v(TAG, "Init loadings contacts");
synchronized (SingleTonProvider.getInstanc...
App Inventor 2 Enhance 拓展：界面增强扩展（颜色渐变、边距、圆角、透明...
...签，将布局传给 Enhance 的背景、边框和间距积木：
when Screen1.Initialize() {
KevinkunEnhance1.SetBgColor(垂直布局_卡片, "#FAFAFA", 0)
KevinkunEnhance1.SetRoundCorner(垂直布局_卡片, 16)
KevinkunEnhance1.SetBorder(垂直布局_卡片, 1, "#DDDDDD")
KevinkunEnhanc...
Arduino 101 实验04 - 温湿度传感器，做一块环境看板 · App Inventor 2 中文网
...地区的气候调整。
第 4 步：收尾
when Screen1.BackPressed() {
Arduino101Humidity1.StopTemperatureUpdates()
Arduino101Humidity1.StopHumidityUpdates()
BluetoothLE1.Disconnect()
}
五、排错表
现象
原因与...
MLKitLanguageId 拓展：离线语言识别 · App Inventor 2 中文网
...e":0.01}]
三、文本很短时调低阈值
when Screen1.Initialize() {
LangId1.ConfidenceThreshold = 0.2
}
属性
ConfidenceThreshold
置信度阈值，0～1，默认 0.5。低于这个值就当作「识别不出来」。
文本很短时可...
手电筒使用指导 · App Inventor 2 中文网
...
按钮文字随状态变化，打开 App 时显示正确状态：
when Screen1.Initialize() {
更新按钮()
}
when 按钮_开关.Click() {
手电筒1.Toggle()
更新按钮()
}
procedure 更新按钮() {
if 手电筒1.IsOn() {
按钮_开关.Text = "关闭手电筒"
按钮_开...
How to create a multiline UITextfield?
...ar app makes View with placeholder and word wrap for notes at event adding screen ?
– Gennadiy Ryabkin
Dec 9 '14 at 11:24
3
...
场景自适应（AdaptiveExperience）使用指导 · App Inventor 2 中文网
...幕时，将同名事件的处理合并到一个事件积木中。
when Screen1.Initialize() {
AdaptiveExperience1.RefreshScene()
标签1.Text = AdaptiveExperience1.GetSceneJson()
}
案例二：选择响应式文字
when 按钮1.Click() {
标签1.Text = AdaptiveExper...
Detect Retina Display
...OS devices, you need to check if the device is running iOS4+ and if the [UIScreen mainScreen].scale property is equal to 2.0. You CANNOT assume a device is running iOS4+ if the scale property exists, as the iPad 3.2 also contains this property.
On an iPad running iOS3.2, scale will return 1.0 in 1...
二维码生成使用指导 · App Inventor 2 中文网
...
案例三：彩色二维码与出错提示
when Screen1.Initialize() {
二维码生成1.BlackColor = &HFF1565C0
二维码生成1.WhiteColor = &HFFFFFFFF
}
when 按钮1.Click() {
二维码生成1.GenerateQRCode(文本输入框1.Text, 图像1)
}
when 二维码生成1....