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NSNotificationCenter addObserver in Swift
...
It's the same as the Objective-C API, but uses Swift's syntax.
Swift 4.2 & Swift 5:
NotificationCenter.default.addObserver(
self,
selector: #selector(self.batteryLevelChanged),
name: UIDevice.batteryLevelDidChangeNotification,
object: n...
Does anyone have benchmarks (code & results) comparing performance of Android apps written in Xamari
...es, each one with its own application :
- Basic “Hello World”
- REST API
- JSON Serialization/Deserialization
- Photo Loading
- SQL Database Insert and Get All
Each test is repeted several times, the graphs show the average results.
Hello World
Rest API
Set of tests aimed at measuri...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...in the same set of functionality as Android application program interface (API) does, and its components cannot be modified for programmers’ special needs.
Due to the large number of user requests for new components, App Inventor has released a new feature called “App Inventor extensions”, wh...
How to scale threads according to CPU cores?
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Look at the example here: java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/… It will tell you a more streamlined way to create and manage the thread pool... It may seem more complicated at first, but as with most things, it's more complicated because if it was simpler yo...
How to enable/disable bluetooth programmatically in android
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Android BluetoothAdapter docs say it has been available since API Level 5. API Level 5 is Android 2.0.
You can try using a backport of the Bluetooth API (have not tried it personally): http://code.google.com/p/backport-android-bluetooth/
...
ASP.NET MVC Controller Naming Pluralization
...For example, a UsersController makes sense if you design your routes like /api/users (all users) and /api/users/{userId} (single user)
– Levi Fuller
Mar 1 '18 at 23:14
...
Angular HttpPromise: difference between `success`/`error` methods and `then`'s arguments
...enience method when you don't need to chain call nor work with the promise API (for example, in routing).
In short:
.then() - full power of the promise API but slightly more verbose
.success() - doesn't return a promise but offeres slightly more convienient syntax
...
How to check edittext's text is email address or not?
...checks that field contains a valid domain name ( always passes the test in API Level < 8 )
ipAddress: checks that the field contains a valid ip address
webUrl: checks that the field contains a valid url ( always passes the test in API Level < 8 )
nocheck: It does not check anything. (Default)
...
How can I assign an ID to a view programmatically?
...ew.
Query these child views using placeholder.findViewById(convenientInt);
API 17 introduced View.generateViewId() which allows you to generate a unique ID.
If you choose to keep references to your views around, be sure to instantiate them with getApplicationContext() and be sure to set each refe...
Android gradle: buildtoolsVersion vs compileSdkVersion
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compileSdkVersion is the API version of Android that you compile against.
buildToolsVersion is the version of the compilers (aapt, dx, renderscript compiler, etc...) that you want to use. For each API level (starting with 18), there is a matching .0...