Android long polling tutorial

Android long polling tutorial

In this tutorial we will show how to create a Java Service in an Android application that will poll a server every 10 seconds and how to get a response. There are a number of ways we can fetch data from the server. Many of them are not suitable for a task of polling a server very often. For the purpose of this application we chose a combination of a Service and an AsyncTask.

The reason for us to use an AsyncTask in addition to a Service is that Service blocks the main thread in Android apps. It is also not allowed to perform network operations on a main thread in Android.

This will result in a android. NetworkOnMainThreadException exception. To start and stop the Service in your Activity or other places call startService and stopService methods:. Android Handler is a class that will help us to schedule messages every 10 seconds. You may also have heard about an AlarmManager. It is not advised to use AlarmManager for time intervals less than a couple of minutes. Here is a simple basic Android AsyncTask class example.

It has a doInBackground method that will dispatch a request to the server and a onPostExecute method that will receive the server response. Inside the run method of SyncService create a new AsyncTAsk each time the server should receive a request:. Currently you have JavaScript disabled. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. Click here for instructions on how to enable JavaScript in your browser.

Android: how to poll server every 10 seconds By Freyalast updated July 16, Android: how to poll server every 10 seconds was last modified: July 16th, by Freya. How to upload files from Android App to server. Android notification large icon from vector xml. Ugly code: The Law of Demeter. Java volatile vs atomic variables. Too many functions in Java code.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Requests from an application to a server, which does not immediately have any result data, will 'block' from a return for a period of time.

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This mechanism benefits applications as they will consume less bandwidth and have to do less processing than if they had to repeatedly poll the server. The design of long polling will depend upon whether you need it to run in background as well. I dont think long polling is really necesarry as it will keep on running and keep using the data think about a socket based chat app.

Try to look at XMPP. Just a thought. Learn more.

What is HTTP Long Polling?

Asked 5 years, 5 months ago. Active 8 months ago. Viewed 3k times.

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AndroSco AndroSco 1, 2 2 gold badges 25 25 silver badges 53 53 bronze badges. When you used a search engine to search for "long polling"what did you learn? When you used a search engine to search for "long polling" androidwhat did you learn? Long polling means you have to constantly ping the server for new messages or reports in your scenario. I can give you an app that does that but depends on your scenario. CommonsWare many sites blicked my country ips Iranso i can not reach them, and same linkes was not usefull to me.

BackStabber hehehe Long polling means you have to constantly ping the server for new message you made my day Active Oldest Votes. BackStabber BackStabber 13 13 bronze badges. Can you please explain. How we do the long polling in Android. The client side implementation. Means we get data continuous. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.Alright, real-time was exaggerated, I just need to update the display value every second.

The long-polling technique see also: push technology jumped to my mind at first.

android long polling tutorial

While a true push is not possible without the server side support, one can however emulate it using recursive ajax call with normal http request but with slower frequency. The code above will work. But the real requirement was that the old long-polling need to be stopped and start a new long polling immediately with new parameter when clicking on a new button or new folder or something.

I used the jquery plugin fancytree to build a tree structure, and when I click on the tree element, I will get the title of the element which is the parameter of the long-polling call. You will see that the lastClicked variable will never be cleared within the longPolling function, unless another click event starts.

In fact, I hate so many global variables. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. This site uses Akismet to reduce spam. Learn how your comment data is processed. This article focuses mainly on solving 3 problems: Apply long-polling technique using jquery ajax function. Share this: Twitter Facebook.

Android: how to poll server every 10 seconds

Like this: Like Loading Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:. Email required Address never made public. Name required. Post to Cancel. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: Cookie Policy.The web has become so dynamic that it's weird to have to refresh anything anymore. We expect instant feedback from whatever application we are using and whatever action we are taking on the application.

Polls adopt realtime technologies to give the owners live updates. This has become a major feature in top social media platforms and it is most essential when you need to perform quick surveys. Popular services like Twitter have adopted polls as a part of their services and it works well to gather user sentiments and thoughts. In this tutorial, you will learn how to build a realtime poll. We will be using Kotlin, Flask and Pusher Channels. By the time we are done, we will have an application that looks like this:.

Create a new project and follow the wizard to set it up. Name your app RealtimePolls. The company domain affects the package name. We will set the domain to com. Choose your minimum SDK. API 19 Android 4. Continue with the EmptyActivity template chosen for you, and finish the wizard.

Log in to your Pusher dashboard. Your dashboard should look like this:. Create a new Channels app. You can easily do this by clicking the big Create new Channels app card at the bottom right. When you create a new app, you are provided with keys. Keep them safe as you will soon need them. Go to your Firebase console and create a new project. When you get to the console, click the Add project card to initialize the app creation wizard.

Add the name of your project.

Build an Android poll app with push notifications

Read and accept the terms of conditions. After this, you will be directed to the project overview screen. Choose the Add Firebase to your Android app option. The next screen will require the package name of your app.

An easy way to get the package name of your app is from your AndroidManifest. Another place you can find this is your app-module build. Look out for the applicationId value. When you enter the package name and click Register app. Next, download your google-services.

After you have downloaded the file, you can skip the rest of the process. Next, log in to the new Pusher dashboardin here we will create a Pusher Beams instance.Parked: PubSub queuing with long-polling subscribers not bound to http.

A lightweight JavaScript client for browser-based and Node-based Cettia applications. A http long polling comet implementation for nodejs and browser. An example clinic patient queue application using server push, Vaadin 8 and Java EE 7. A sample project demonstrating how to handle long operations while the user can still navigate across other parts of the application. Search contents of very large files with long-polling, using ASP.

NET Core 2. Add a description, image, and links to the long-polling topic page so that developers can more easily learn about it. Curate this topic. To associate your repository with the long-polling topic, visit your repo's landing page and select "manage topics. Learn more. Skip to content. Here are 46 public repositories matching this topic Language: All Filter by language. Sort options.

Star 2. Code Issues Pull requests. Reverse proxy for realtime web services. Star 1. Python Socket.Thus, there was no mechanism for…. Thus, there was no mechanism for the server to independently send, or push, data to the client without the client first making a request. To overcome this deficiency, Web app developers can implement a technique called HTTP long polling, where the client polls the server requesting new information.

The server holds the request open until new data is available. Once available, the server responds and sends the new information. When the client receives the new information, it immediately sends another request, and the operation is repeated. This effectively emulates a server push feature. A simple diagram below:. When looking at HTTP long polling with the goal of streaming data, PubNub is a low-latency and low-overhead realtime Web app communication environment, and features the ability to send messages to a single client, client groups and all clients.

Instead of relying solely on HTTP long polling for realtime messaging, a protocol agnostic approach is beneficial. PubNub automatically chooses the best protocols and frameworks depending on environment, latency, etc. Any server or client code wanting to communicate makes a single API call to publish or subscribe to data channels. The code is identical between clients and servers, making implementation much simpler than using HTTP long polling.

What are WebSockets - How is it different from HTTP?

In terms of connection management, the network handles network redundancy, routing topology, loading balancing, failover, and channel access. Additionally, PubNub offers core building blocks for building realtime into your application. Please fill in the form below and we will get back to you within 24 hours. You need to enable JavaScript to run this app.

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Thanks for subscribing! Get ready for some great content. As usage grows, how will you orchestrate your realtime backend? When mobile devices rapidly switch between WiFi and cellular networks or lose connections, and the IP address changes, does long polling automatically re-establish connections?It is a very simple example of a purely native application, with no Java source code.

In the absence of any Java source, the Java compiler still creates an executable stub for the virtual machine to run. The stub serves as a wrapper for the actual, native program, which is located in the. The app itself simply renders a color onto the entire screen, and then changes the color partly in response to movement that it detects. An app with only native code must not specify an Android API level lower than 9, which introduced the NativeActivity framework class.

The following line declares android:hasCode as falseas this app has only native code—no Java. Finally, the manifest specifies android:value as the name of the shared library to be built, minus the initial lib and the.

Next, it lists the external libraries for the build system to use in building the binary. The -l link-against option precedes each library name.

The final line tells the build system to build this static library. For more information about the Android. The following includes correspond to the libraries, both shared and static, enumerated in Android. It also serves as a wrapper that simplifies handling of NativeActivity callbacks. Next, the program handles events queued by the glue library. The event handler follows the state structure. The application prepares to start monitoring the sensors, using the APIs in sensor.

Next, a loop begins, in which the application polls the system for messages sensor events. When a match occurs, the message is sent to the handler for execution.

android long polling tutorial

Once the queue is empty, and the program exits the polling loop, the program calls OpenGL to draw the screen. Content and code samples on this page are subject to the licenses described in the Content License. Home Guides Reference Samples Downloads.

android long polling tutorial

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