timertask

问题 I have tried multiple ways to have a single persistent timer update the ui in multiple activities, and nothing seems to work. I have tried an AsyncTask, a Handler, and a CountDownTimer. The code below does not execute the first Log.i statement.... Is there a better way to start the timer (which must be called from another class) in Main (which is the only persistent class)? public static void MainLawTimer() { MainActivity.lawTimer = new CountDownTimer(MainActivity.timeLeft, 1000) { public

问题 I'm trying to read an NDEF message from an NFC tag. The detection of the tag works correctly. For reading the NDEF data from the tag I'm running a TimerTask. The task polls the NDEF message from the tag with getNdefMessage() every 900 ms and updates the UI. The procedure works perfect until I remove the phone. Than the app freezes without a logcat error message. Does anyone have an idea why this happens? package com.example.infcdemo; import java.io.IOException; import java.util.Timer; import

问题 I need to Synchronize some tables between the App SQLite Database an a MS SQL Database hosted online. I already have a COLUMN (IsSync) on each table that allows me to know which ROWS are pending sync (i.e. SELECT * FROM Locations WHERE IsSync=0) The Locations table is one of the tables that I need to synchronize as soon as the table got updated/inserted. This table contains GPS Location data (Lat,Lng,Accuracy,Speed, etc) that is inserted EACH AND EVERY 3-4 SECONDS (15 records each minute).

问题 I have an app in which based on some click I start the timer using the TimerTask(). But I would also like to have support for multiple timers for multiple clicks. So if one timer is already working and another click is issued then it starts a separate timer thread and not just cancel the first one. Could someone please help? @Override public void onListItemClicked(int index, Map<String, Object> data) { timer = new Timer(); timer.schedule(new TimerTask() { int n = 0; @Override public void run(

问题 I want to make a simple program that counts seconds up until 100 using Java.Util.Timer The code below is the code I am using, however it simply prints all the numbers out at once without waiting a second between each one. How would I fix that? (Ordinarily I would use a thread.sleep but this is just proof of concept.) import java.util.Timer; import java.util.TimerTask; public class Main { static Timer timer = new Timer(); static int seconds = 0; public static void main(String[] agrs) { MyTimer

问题 I have a problem in my code can anyone help me? I need to make app play story like Messenger app I want to display a list of images and videos in viewpager automatically or manually I do it but I faced some problem First: when page of image is view and the next page play video the sound of video is playing when view the image because the pager load the next fragment i used mViewPager.setOffscreenPageLimit(0); but i didn't do any thing Second one: when I move manually from video to image the

问题 I am a newbie in android. I am developing an app in which a particular piece of code executes after every 5 seconds in background.To achieve this I am using a service with timer with a timer task in it. For sometime its working fine but after some indefinite my service is running but timer task stops automatically in android. Here is my code please help. Thanks in advance. public void onStart(Intent intent, int startid) { //this is the code for my onStart in service class int delay = 1000; //

问题 I suspect an exception could make the TimerTask stop running in which case I most likely need a second timetask to monitor that the first is still running? Update Thanks for the answers. I had inherited this code so a bit ignorant... I just saw that if I throw an uncaught exception in my job the TimerThread ceases to run forever. Run method of TimerThread showed that if an exception is thrown, my scheduled thread never runs again. public void run() { try { mainLoop(); } finally { // Someone

问题 How can one ensure that a task that is supposed to run for x amount of time on an android os be run for that x period without user manipulation of date and time? For example, if I want this timer to run for 24 hours solid and then advise the user that 24h has passed, even if the phone is off for an hour, the user then turns it back on and sets the system time forward 2 hours, this timer would still indicate when that solid 24 hour period had passed without the user manipulating the system

问题 How can one ensure that a task that is supposed to run for x amount of time on an android os be run for that x period without user manipulation of date and time? For example, if I want this timer to run for 24 hours solid and then advise the user that 24h has passed, even if the phone is off for an hour, the user then turns it back on and sets the system time forward 2 hours, this timer would still indicate when that solid 24 hour period had passed without the user manipulating the system