timertask | 易学教程

TimerTask not executing?

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问题 Here is my timer class, This class is designed to constantly update a timer in a view. However, when I run the app the first toast message is displayed to the screen but the second one is never reached (the timerTask's "run" method is never executed). I know that this is probably something simple that I am doing wrong. If anyone could steer me in the right direcion that would be great. public class MyTimer { static Timer _timerTask = new Timer(); static int totalSeconds = 1, hour = 0, min = 0

Android Timer Task doesn't wait for the scheduled delayed time

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问题 The timer task doesn't wait for the scheduled delayed time. I want to delay the network check by 10 seconds,but it performs the action within few seconds without waiting.Any help would be appreciated. int i = 0; public void timertask() { while(i < 5){ Handler handler = new Handler(); handler.postDelayed(new Runnable() { public void run() { if(isNetworkConnected()) // Some method to check net connection { download(); //Method to download } } }, 10000); System.out.println("i = "+i); i++; } }

how to handle a queue in android?? java

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问题 I need to know, how to handle a queue in android java code. I want to fire some method when queue is not empty. Can anyone give advice about this… Currently I have implemented a timer task. This class frequently sees the queue status. When queue is not empty it will fire the method. I want to know have any alternative ways to do this.. public class GSMLocationTask extends TimerTask { Handler TDGetDeviceLocHandler; int myLatitude, myLongitude; int cid; int lac; double latitude; double

Android - Timer not running in perodic intervals when app is in locked or sleep state

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问题 In my android project I have periodic task to update API for every 60 seconds for that i am using TimerTask everything is working fine when app is in background or foreground when app is in locked state or sleep state timer milliseconds is lagging every minute, such as first api timing is 10.00. 00 second api timing is 10.01. 05 for every count milliseconds is getting increased I have tried Work Manager but my perodic interval is 60 Sec,I need an answer which runs perodic Jobs for every 60

Building thinking time delay with time based tasks?

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问题 I have this meter job for which I need to build some think time between certain HTTP Requests. But during those thinking time I still need to send a keep alive request on specific interval. For example: User login get some profile information. Then he start to do some work. each unit of work is delayed by some random delay varying from 1 to 30 minutes. During that time we still need to send to there server a ImAlive request at fix interval (like 5 minutes). Once the thinking time is expired

Moving JPanels using TimerTask

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问题 So I have set up a Java GUI like the one pictured below (apologies for horribly painted recreation): Layout for Java GUI All of the JPanels are equal size (not shown well in the drawing). What I'm trying to do is make it so that when I am doing something with the progress bars (I.E reading some text files in), the JPanels will cycle through. As in the red one will go to the bottom, the orange one will go to the top, and thus keep going in this cycle. I'd like them to change every half second

Showing Timer in android

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问题 My objective is to display a simple timer clock on my screen where it starts from 20 and goes on decreasing and when it becomes 0 I want to start an action. How to achieve this ? Thanks in advance 回答1: I don't know how you want to display it but you can do this also just by taking a TextView and keep changing its Text every second. static int i = 20; new CountdownTimer(20000, 1000) { public void onTick(long millisUntilFinished) { i = i-1; mTextField.setText(String.valuOf(i)); } public void

Timer schedule vs scheduleAtFixedRate?

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问题 public class MyTimerTask extends TimerTask{ @Override public void run() { int i = 0; try { Thread.sleep(100000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("Run Me ~" + ++i); System.out.println("Test"); } } Case 1 :- TimerTask task = new MyTimerTask(); Timer timer = new Timer(); timer.schedule(task, 1000,6000); // line 1 System.out.println("End"); // here is bebug point. My Expectation of schedule() method (as per my understanding given in javadocs where each

When a Java TimerTask is scheduled in a Timer, is it already “executing”?

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问题 I would like to clarify something about TimerTask. When you have the code below: timer.schedule(task, 60000); where the task is scheduled to run in the next 1 minute, is the task object already executing? because somewhere in my code I called task.cancel() but it seems that the call doesn't prevent task to be executed. I even logged the return value from the call and it returns false. I came about my question when I read the documentation for the cancel method: Cancels the TimerTask and

How to Stop Timer Android

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following is my code: In MainActivity.class private OnCheckedChangeListener alert_on_off_listener = new OnCheckedChangeListener(){ public void onCheckedChanged(RadioGroup groupname, int CheckedButtonId) { if(CheckedButtonId==R.id.radiobutton_on){ Toast.makeText(getApplicationContext(), "radio on", Toast.LENGTH_LONG).show(); alert_on = true; display_alert(); } else{ alert_on = false; } } }; public void display_alert(){ int delay = 10000; Timer timer =new Timer(); timer.scheduleAtFixedRate(new TimerTask() { public void run() { Intent myIntent = new Intent(HoraWatchActivity.this,MyService.class);