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DaffyMenu 扩展:弹出菜单扩展,为组件添加弹出式菜单功能 · App Inventor 2 中文网
... 教育 中文教育版 各版本对比 App上架指南 入门必读 IoT专题 AI2拓展 Aia Store 关于 关于我们 发布日志 服务条款 ...
做了个购物清单App后,我才真正搞懂App Inventor 2的变量 - App应用开发 - ...
...的积木能做出真正好用的App"。
复盘感悟
变量是编程的地基。App Inventor 2把变量简化为5种积木块——初始化全局、初始化局部(do)、初始化局部(return)、取值、设置值——看起来简单,但每个都有其使用场景:
- 全局变...
Android dismiss keyboard
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Here's a Kotlin solution (mixing the various answers in thread)
Create an extension function (perhaps in a common ViewHelpers class)
fun Activity.dismissKeyboard() {
val inputMethodManager = getSystemService( Context.INPUT_METHO...
Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
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第一个变量 ProgID 表示Real-Time Data 服务器(RTD Server)的编程标识符 (ProgID)。Server 变量指示运行RTD Server的计算机的名称;如果RTD Server在本地运行,则可以将此变量设置为空字符串或将其忽略。其他变量只表示发送到RTD Server的...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
...使用厂商提供的App进行IO口控制,也可以使用App Inventor 2 编程实现控制IO口电平的高/低,对应LED的开/关。
3、App Inventor 2 开发自己的蓝牙App
主要用到 BlueToothLE 拓展,点此查看中文文档。BLE蓝牙的特点是无需配对,设备被扫描...
How to disable an Android button?
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In Kotlin, if you refer the Button View with id then, enable/disable button as like
layout.xml
<Button
android:id="@+id/btn_start"
android:layout_width="100dp"
android:layout_height="50dp"
android:text="@stri...
How to check if my string is equal to null?
... return true;
}
else {
return false;
}
Updated
For Kotlin we check if the string is null or not by following
return myString.isNullOrEmpty() // Returns `true` if this nullable String is either `null` or empty, false otherwise
return myString.isEmpty() // Returns `true` if th...
Programmatically go back to the previous fragment in the backstack
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requireActivity().onBackPressed() for Kotlin
– Ayxan Haqverdili
Jul 10 at 10:35
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How to build sources jar with gradle
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The Kotlin DSL equivalent would be:
tasks {
val sourcesJar by creating(Jar::class) {
dependsOn(JavaPlugin.CLASSES_TASK_NAME)
classifier = "sources"
from(java.sourceSets["main"].allSource)
}
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Calling a Fragment method from a parent Activity
...gment.<specific_function_name>();
Update:
For those who are using Kotlin
var fragment = supportFragmentManager.findFragmentById(R.id.frameLayoutCW) as WebViewFragment
fragment.callAboutUsActivity()
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