A Looper is a message handling loop: it reads and processes items from a MessageQueue. The Looper class is usually used in conjunction with a HandlerThread (a subclass of Thread). A Handler is a utility class that facilitates interacting with a Looper—mainly by posting messages and Runnable objects to the thread’s MessageQueue. When a Handler … Read more
Handler is better than TimerTask. The Java TimerTask and the Android Handler both allow you to schedule delayed and repeated tasks on background threads. However, the literature overwhelmingly recommends using Handler over TimerTask in Android (see here, here, here, here, here, and here). Some of reported problems with TimerTask include: Can’t update the UI thread … Read more
I don’t understand exactly what your code is trying to do, but you can make variables available in any event handler using the advantages of function closures: function addClickHandler(elem, arg1, arg2) { elem.addEventListener(‘click’, function(e) { // in the event handler function here, you can directly refer // to arg1 and arg2 from the parent function … Read more
See par’s answer for another and more up to date solution UINavigationController animations are run with CoreAnimation, so it would make sense to encapsulate the code within CATransaction and thus set a completion block. Swift: For swift I suggest creating an extension as such extension UINavigationController { public func pushViewController(viewController: UIViewController, animated: Bool, completion: @escaping … Read more
You can use: Handler handler = new Handler() handler.postDelayed(new Runnable()) Or you can use: handler.removeCallbacksAndMessages(null); Docs public final void removeCallbacksAndMessages (Object token) Added in API level 1 Remove any pending posts of callbacks and sent messages whose obj is token. If token is null, all callbacks and messages will be removed. Or you could also … Read more
It works fine but is it the “right” approach and is there better alternative? I hold onto the Throwable or Exception in the AsyncTask instance itself and then do something with it in onPostExecute(), so my error handling has the option of displaying a dialog on-screen.
You probably want to look into the observer pattern. Here’s some sample code to get yourself started: import java.util.*; // An interface to be implemented by everyone interested in “Hello” events interface HelloListener { void someoneSaidHello(); } // Someone who says “Hello” class Initiater { private List<HelloListener> listeners = new ArrayList<HelloListener>(); public void addListener(HelloListener toAdd) … Read more
If you want the click handler to work for an element that gets loaded dynamically, then you set the event handler on a parent object (that does not get loaded dynamically) and give it a selector that matches your dynamic object like this: $(‘#parent’).on(“click”, “#child”, function() {}); The event handler will be attached to the … Read more
var module = angular.module(‘testApp’, []) .directive(‘onFinishRender’, function ($timeout) { return { restrict: ‘A’, link: function (scope, element, attr) { if (scope.$last === true) { $timeout(function () { scope.$emit(attr.onFinishRender); }); } } } }); Notice that I didn’t use .ready() but rather wrapped it in a $timeout. $timeout makes sure it’s executed when the ng-repeated elements … Read more
How about something like this: class MyActivity extends Activity { Worker mWorker; static class Worker extends AsyncTask<URL, Integer, Long> { MyActivity mActivity; Worker(MyActivity activity) { mActivity = activity; } @Override protected Long doInBackground(URL… urls) { int count = urls.length; long totalSize = 0; for (int i = 0; i < count; i++) { totalSize += … Read more