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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...
OnCreateOptionsMenu() not called in Fragment
.... Thank you for sharing this! I had this exact problem because I'm using Kotlin and many times you don't have to do findViewById, etc... to get the view you need.
– DWndrer
Sep 16 '18 at 2:54
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技术人员如何创业《一》—— 产品及想法 - 资讯 - 清泛网 - 专注C/C++及内核技术
...源优势（哈佛）。其实他这个php网站我想现在很多学过web编程的都可以制造出来，有几个能做成facebook呢？
在《中国合伙人》中也有个场景，成东青因为在外面开小班被大学辞退了。最后一堂课时改变了原有的讲课风格，原来...
Android dismiss keyboard
...
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...
How to disable an Android button?
...
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
add a comment
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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)
}
...
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()
share
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How do I change the android actionbar title and icon
... @JoseManuelAbarcaRodríguez Thank you, that's what was missing for me. In Kotlin: supportActionBar?.setDisplayShowTitleEnabled(true) then supportActionBar?.title = "your title". And it has to be done in onResume, not in onCreate, when creating the activity with startActivity.
–...