You should use Handler.post() whenever you want to do operations on the UI thread. So let’s say you want to change a TextView‘s text in the callback. Because the callback is not running on the UI thread, you should use Handler.post(). In Android, as in many other UI frameworks, UI elements (widgets) can be only … Read more
In my experience calling this worked great! handler.removeCallbacksAndMessages(null); In the docs for removeCallbacksAndMessages it says… Remove any pending posts of callbacks and sent messages whose obj is token. If token is null, all callbacks and messages will be removed.
I do this to post a delayed runnable: myHandler.postDelayed(myRunnable, SPLASH_DISPLAY_LENGTH); And this to remove it: myHandler.removeCallbacks(myRunnable);
You have three protected methods in an AsyncTask that can interact with the UI. onPreExecute() runs before doInBackground() onPostExecute() runs after doInBackground() completes onProgressUpdate() this only runs when doInBackground() calls it with publishProgress() If in your case the Task runs for a lot longer than the 30 seconds you want to refresh you would want … 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
Short answer: they all run on the same thread. If instantiated from an Activity lifecycle callback, they all run on the main UI thread. Long answer: A thread may have a Looper, which contains a MessageQueue. In order to use this facility, you would have to create a Looper on the current thread by calling … Read more
You’re almost using postDelayed(Runnable, long) correctly, but just not quite. Let’s take a look at your Runnable. final Runnable r = new Runnable() { public void run() { handler.postDelayed(this, 1000); gameOver(); } }; When we call r.run(); the first thing it’s going to do is tell your handler to run the very same Runnable after … Read more
If whatever you are doing is “heavy” you should be doing it in a Thread. If you do not explicitly start it in its own thread, then it will run on the main (UI) thread which may be noticeable as jittery or slow to respond interface by your users. Interestingly when you are using a … Read more
This is a working example: HandlerThread ht = new HandlerThread(“MySuperAwesomeHandlerThread”); ht.start(); Handler h = new Handler(ht.getLooper()) { public void handleMessage(Message msg) { Log.d(TAG, “handleMessage ” + msg.what + ” in ” + Thread.currentThread()); }; }; for (int i = 0; i < 5; i++) { Log.d(TAG, “sending ” + i + ” in ” + … Read more
Only the parameterless constructor is deprecated, it is now preferred that you specify the Looper in the constructor via the Looper.getMainLooper() method. Use it for Java new Handler(Looper.getMainLooper()).postDelayed(new Runnable() { @Override public void run() { // Your Code } }, 3000); Use it for Kotlin Handler(Looper.getMainLooper()).postDelayed({ // Your Code }, 3000)