This simple program illustrates the basic parts of implementing and scheduling a task to be executed by a timer thread. Sometimes, timer threads aren't the only threads that can prevent a program from exiting when expected. The following modification of Reminder adds beeping, which requires us to also add a call to the System. Significant changes are in highlighted. You can find the source code in ReminderBeep. When you execute it, you see the following output our comments about timing are shown in italics : Task scheduled.
Here are all the Timer methods you can use to schedule repeated executions of tasks: schedule TimerTask tasklong delaylong period schedule TimerTask taskDate timelong period scheduleAtFixedRate TimerTask tasklong delaylong period scheduleAtFixedRate TimerTask taskDate firstTimelong period When scheduling a task for repeated execution, you should use one of the schedule methods when smoothness is important and a scheduleAtFixedRate method when time synchronization is more important.
For example, the AnnoyingBeep program uses the schedule method, which means that the annoying beeps will all be at least 1 second apart. If one beep is late for any reason, all subsequent beeps will be delayed. The timer tasks we've shown have been very simple. They do almost nothing and refer only to data that either can be safely accessed from multiple threads or is private to the timer task. However, if your timer implementation depends on shared resources, such as data used by other places in your program, you need to be careful.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm developing an Android 2. I need something what works like NSTimer.
And then you receive these broadcasts via broadcast receiver.Xhemter pic atas tilam laki
Note that this will need to be registered ether in your application manifest or via context. Broadcast Receiver.
Calling a method repeatedly for every 1 min
You can please try this code to call the handler every 15 seconds via onResume and stop it when the activity is not visible, via onPause.
The downside of this is that you have to architect polling your data in a different way. However, there are a lot of benefits to the Reactive Programming way:. Please check out RxJava. It has a high learning curve but it will make handling asynchronous calls in Android so much easier and cleaner.Hilti vs bosch
Here I used a thread in onCreate an Activity repeatly, timer does not allow everything in some cases Thread is the solution. Learn more. How to run a method every X seconds Ask Question.Alabanzas cristianas de adoracion viejitas
Asked 7 years, 9 months ago. Active 5 months ago. Viewed k times. What do you recommend me? VansFannel VansFannel 39k 90 90 gold badges silver badges bronze badges. Define "the best one". In what way do you want it to be the best?
I don't know which method fits better with NSTimer. VansFannel How long of an interval are you wanting? I've updated the question with details about what I'm trying to do.
This question: stackoverflow. Active Oldest Votes. This really depends on how long apart you need to run the function.Android Tutorial: Update TextView Every Second. Timer
Jug6ernaut Jug6ernaut 7, 2 2 gold badges 23 23 silver badges 26 26 bronze badges. Why different suggestions depending on the time delay? Efficiency, In the AlarmManager docs it states that it should not be used for any small interval repetitive task. For normal timing operations ticks, timeouts, etc it is easier and much more efficient to use Handler.
But, I need to run a method in the same Activity that has launch the AlarmManager.Periodically your Android application might need to perform a task, such as checking a server for updates. The AlarmManager class enables the scheduling of repeated alarms that will run at set points in the future.
The AlarmManager is given a PendingIntent to fire whenever an alarm is scheduled. The first corresponds to the time since system boot and the second to UTC time.
Understand the Activity Lifecycle
Below is a list of the different alarm type variations available. If the device is asleep, it fires when the device is next awake. It wakes up the device if it is asleep. RTC — Fires the pending intent at a specified time. If the device is asleep, it will not be delivered until the next time the device wakes up. Deciding on the alarm to use depends on the requirements of the task at hand.
How to extend screen lock timeout?
Time elapsed is suitable for setting alarms that should fire based on the passage of time, for instance regularly checking a server for changes. If you want to run a task dependent on the current locale, then the real time clock will be more suitable. Note that elapsed time is usually the better choice. If the user changes their time settings or moves to a new locale, the change might cause some unexpected behaviour in the app.
If you set a specific time for an app to sync with a server, the server could be overwhelmed when all instances of the app hit at the same time. Code for this project can be found at this Git Repo. Create a new Android project. For the view, create two buttons that will start and stop the periodic operations. Create a class that inherits from BroadcastReceiver. In the onReceive method, which is called when the BroadcastReceiver is receiving an Intent broadcast, we will set up the code that runs our task.
In AlarmReceiver. We then need to register the BroadcastReceiver in the manifest file. Declare the AlarmReceiver in the manifest file. In MainActivity. The PendingIntent will be used to set and cancel the alarms. In onCreate we create an Intent that references our broadcast receiver class and uses it in our PendingIntent. We then include the method that will set up the recurring alarms. Once set, the alarm will fire every 10 seconds. We used the setRepeating method to set up a recurring alarm, but setInexactRepeating could also be used.
How can I loop that time function on the onCreate every 5 seconds. I want to execute time function in onCreate every 5 seconds. Learn more. How to loop or execute a function every 5 seconds on Android Ask Question. Asked 4 years, 2 months ago. Active 1 month ago. Viewed 21k times. Roc Boronat 7, 2 2 gold badges 28 28 silver badges 43 43 bronze badges. Chong Chong 1 1 gold badge 1 1 silver badge 6 6 bronze badges. Active Oldest Votes. Christian Stengel Christian Stengel 2 2 silver badges 10 10 bronze badges.
Try to do like this! It should work. Nik Nik 2 2 gold badges 10 10 silver badges 21 21 bronze badges. If it's helpful to you don't forget to upvote this answer. Behzad F94 Behzad F94 51 3 3 bronze badges. Although the code might help and work, please also add an explanation to your answer and how it solves the question's issue. Here's a simple way to do it in Kotlin. Roc Boronat Roc Boronat 7, 2 2 gold badges 28 28 silver badges 43 43 bronze badges.
Sign up or log in Sign up using Google. Sign up using Facebook.I want to call some function indefinitely when app is in foreground as well as in background. I need this because I am developing a reminder app, so it should continuously check for active reminders and notify the user on specified time.
For background I tried background fetch but it calls the function on its own time not by specified time. You should use local notifications for this.
Read this. On iOS you can't poll things or run code in the background except in very limited circumstances, and this isn't one of them. So the approach you were looking for just isn't allow. On Android it's allowed, but it's just a bad idea for battery life reasons. You want notifications instead.
Actually I am using local notification to remind user about their tasks. But to trigger that notification I need something to run in background forever, of-course I read in many places that it is bad to call function in background forever, but I wonder for a reminder app it is necessary right or am I missing something? But in my case I want to check active reminders in local db sqlite for every 1 minute and sync with server for every 5 minutes to get latest data.
If I found the way to trigger for every 1 minute I would use counter for 5 minutes sync. Using local notification I could set repeat interval for every 1 minute, but how I would be able to check my local db for active reminder using this? In Android we did this using AlarmManager to trigger the intent service for every 1 minute and it checks our local db for active reminders.
How to achieve this in iOS or what type of background service I can implement other than background fetch? I tried below functions in notification object. What it does actually? I just want to know is it possible to call some function for every x minute using Notification as I did above. I got this idea from below thread. That's in objective c, I didn't understand much, but just tried. Please someone help me to solve this InvokeOnMainThread has nothing to do with notifications.
That method is defined on NSObject the base class for all Objective-C classesand that method is just used to run code on the main thread. It doesn't run the code at an interval.Pinjaman peribadi kuala lumpur
It just runs it once. The answer given in the StackOverflow post is wrong. When your app goes into the background you have a small amount of time to finish what you're doing, and then your app is just suspended all code stops running. Timers don't fire, and threads stop making progress. Local notifications don't run code. You can schedule a notification at a certain time to show something to the user, but you can't run code unless your app is already in the foreground.
I think you need to step back from the solution you have in mind and look at what your actual use case is. You're making a reminders app, so you need to remind people of things at certain times.
You don't need to run code in the background for that. The notification API lets you schedule an alert at a given time. If someone sets a reminder for 2PM on Tuesday then you can create and schedule an alert notification to appear at 2PM on Tuesday, and the OS will take care of showing that alert at the right time.Every Android developer, at one point or another, needs to deal with threads in their application.
The main thread is responsible for dispatching events to the appropriate user interface widgets as well as communicating with components from the Android UI toolkit. To keep your application responsive, it is essential to avoid using the main thread to perform any operation that may end up keeping it blocked. Network operations and database calls, as well as loading of certain components, are common examples of operations that one should avoid in the main thread.
When they are called in the main thread, they are called synchronously, which means that the UI will remain completely unresponsive until the operation completes. For this reason, they are usually performed in separate threads, which thereby avoids blocking the UI while they are being performed i. Android provides many ways of creating and managing threads, and many third-party libraries exist that make thread management a lot more pleasant. However, with so many different approaches at hand, choosing the right one can be quite confusing.
In this article, you will learn about some common scenarios in Android development where threading becomes essential and some simple solutions that can be applied to those scenarios and more.
AsyncTask is the most basic Android component for threading. It is worth noting that even something as simple as screen rotation can cause the activity to be destroyed. Loaders are the solution for the problem mentioned above.
Loaders can automatically stop when the activity is destroyed, and can also restart themselves after the activity is recreated. You will learn more about CursorLoader later in this article. Service is a component that is useful for performing long or potentially long operations without any UI. Service runs in the main thread of its hosting process; the service does not create its own thread and does not run in a separate process unless you specify otherwise.
With Serviceit is your responsibility to stop it when its work is complete by calling either the stopSelf or the stopService method. Like ServiceIntentService runs on a separate thread, and stops itself automatically after it completes its work. Sometimes you may want to send an API request to a server without needing to worry about its response.Vivo y55s msm8917 firmware
Since this involves making a request over the network, you should do it from a thread other than the main thread. However, AsyncTask and loaders are both dependent on the lifecycle of the activity. This means you will either need to wait for the call to execute and try to prevent the user from leaving the activity, or hope that it will execute before the activity is destroyed. It will therefore be able to continue with the network call even after the activity is destroyed.
However, since a service will begin running on the UI thread, you will still need to manage threading yourself.
You will also need to make sure that the service is stopped once the network call is complete. Moreover, IntentService stops itself automatically, so there is no need to manually manage it, either.
This use case is probably a bit more common. For example, you may want to invoke an API in the back-end and use its response to populate fields on the screen. Trying to get data out of a Service or an IntentService into the main UI thread would make things very complex. At first blush, AsyncTask or loaders would appear to be the obvious solution here. They are easy to use—simple and straightforward.
Moreover, error handling becomes a major chore with these components.Today we will look into Android AsyncTask. We will develop an Android example application that performs an abstract AsyncTask in background. Android AsyncTask is an abstract class provided by Android which gives us the liberty to perform heavy tasks in the background and keep the UI thread light thus making the application more responsive.
Android application runs on a single thread when launched. Due to this single thread model tasks that take longer time to fetch the response can make the application non-responsive. To avoid this we use android AsyncTask to perform the heavy tasks in background on a dedicated thread and passing the results back to the UI thread. Hence use of AsyncTask in android application keeps the UI thread responsive at all times.
The time in seconds is passed as a parameter to the class and a ProgressDialog is displayed for the given amount of time. The images given below are the outputs produced by the project where the time set by the user is 5 seconds. This brings an end to the tutorial. You can download the final Android AsyncTask Project from the below link. Is there any possibility of returning an object from Async Task and using the attributes of that object in my main activity?
Hello ,Goodevening Your stuff is best it helps me a lot but i just have one doubt plz give me a solution for it. I have a question. I have created a project. I must that two asyntask methods need work at same time on the project. But I can not do with asyntask. What can you advise me? Thanks for the answer. I want to bind the sqlite DB with the frot end using AsyncTask can please help me do this?
This is offline project.
I searched google docs asynctask but it makes me more confused.
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