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Thursday, November 17, 2016

Use Handler for Android Timer

//run Runnable every 100ms


private Handler handler = new Handler();
handler.postDelayed(runnable, 100);


private Runnable runnable = new Runnable() {
   @Override
   public void run() {
      /* do what you need to do */
      foobar();
      /* and here comes the "trick" */
      handler.postDelayed(this, 100);
   }
};



Android Timer Java

Android handle Timer

Well, after programming a while for Android I got in touch with some things that are different from usual Java. I already mentioned that before, when I decided to start writing about my experiences with Android: Android & Memory (Leaks) ;) This time I’d like to write a bit about Timer and TimerTask and why you shouldn’t use them… While coding for a project I noticed that updating the gui out of a TimerTask didn’t work everytime and specially didn’t work good. Actually it basically never worked and at first I just couldn’t figure what was going on. I put some debugging stuff in the timers and everything seemed to be fine, as the debug messages appeared in the Log. Still: the gui wasn’t affected at all :oogle: So I started with some research and found a lot of people with same effects but just few answers (kind of get used to that ^^). So after some time I found an article on Android Developers: Updating the UI from a Timer. The author is describing a kind of similar problem to mine but still not the same. Anyway, he’s also talking about “The Android way” which basically says: Timer(Tasks) are bad! Do it the Android way: Use a Handler :) Interesting idea so I gave it a try and now it works perfectly . Java for Android, Second Edition: - Hasil Google Books https://books.google.co.id/books?isbn=1771970251 - Terjemahkan laman ini Budi Kurniawan - 2015 - ‎Computers Most of the time, it is used to process messages and schedule a task to run at a future time. ... runs on the thread that created it, which in most cases would be the UI thread. As such, you should not schedule a longrunning task with a Handler ... Multithreading and Concurrency - Java Programming Tutorial https://www3.ntu.edu.sg/home/.../java/j5e_multithreading.html Terjemahkan laman ini 2.2 Example 2: Still Unresponsive UI with Thread ... The term "concurrency" refers to doing multiple tasks at the same time. Java ... The stop-button handler sets the stop flag; while the start-button handler checks if stop flag has been set before ... Android timer? How? - Stack Overflow stackoverflow.com/questions/4597690/android-timer-how Terjemahkan laman ini 4 Jan 2011 - ok since this isn't cleared up yet there are 3 simple ways to handle this. Below is an ... Timer; import java.util. ... Handler; import android.os. Timer | Android Developers https://developer.android.com/reference/java/util/Timer.html Terjemahkan laman ini Java 5.0 introduced the java.util.concurrent package and one of the concurrency utilities therein is the ScheduledThreadPoolExecutor which is a thread pool for ... CountDownTimer | Android Developers https://developer.android.com/.../android/.../CountDownTimer.... Terjemahkan laman ini java.lang.Object. ↳, android.os.CountDownTimer. Schedule a countdown until a time in ... Start the countdown. Inherited methods. From class
SELANJUTNYA- Use Handler for Android Timer

Sunday, November 13, 2016

How to for each the hashmap in Java

HashMap<String, HashMap> selects = new HashMap<String, HashMap>();
for(Map.Entry<String, HashMap> entry : selects.entrySet()) {
    String key = entry.getKey();
    HashMap value = entry.getValue();

    // do what you have to do here
    // In your case, an other loop.
}
How to loop a Map in Java - Mkyong.com https://www.mkyong.com/java/how-to-loop-a-map-in-java/ 25 Jun 2010 - Map map = new HashMap(); map.put("1", "Jan"); ... getValue()); } //Java 8 only, forEach and Lambda map. 4 example to Iterate over HashMap, Hashtable or any Map in Java javarevisited.blogspot.com/.../how-to-traverse-or-loop-hashma... There are multiple way to iterate, traverse or loop through Map, HashMap or TreeMap in Java and we all familiar of either all of those or some of those. But to my ... How to Iterate Over a Map in Java www.sergiy.ca/how-to-iterate-over-a-map-in-java/ Since all maps in Java implement Map interface, following techniques will work for any map implementation ( HashMap , TreeMap , LinkedHashMap , Hashtable ...
SELANJUTNYA- How to for each the hashmap in Java