Asynctask in android download from api

Bundle; import android. Log; import android. View; import android. OnClickListener; import android. Button; import android.

However the example currently has problems with possible memory leaks app crash if there was a screen rotation shortly before the async task finished. PDF - Download Android for free. Previous Next. 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. Please sir how can I use Async Task to display an image or a progress bar while another activity loads?

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. But you did really great. Below you can download code, see final output and follow step by step explanation of the example:.

Download Code. Step 5: Open AndroidManifest. Is it mandatory to write the MyAsynctask class in the same file as MyActivity? If I use a separate file for MyAsynctask, will there be any problem memory leakage, for example? Tutorial is great. Everything is ok, but displaying data is very,very slow. I do not know why. Thank you for tutorial. You can consider buying server because it is very cheap. Go for 3 year plan and always buy in offer. Actually you can go one more step down: Executors.

Thank you for this! It helped me a lot when calling server API calls. But what if I want to show some updating progress bars? Add a comment. How to show percentage when background stuff called? This solution has several drawbacks. First, the thread keeps a reference to the activity, this might leak the context and crash the app. Second, we cannot use this from a fragment. Third, we cannot update progress of the background task, Fourth, there is no way to cancel the thread.

Finally, it creates many boilerplate code in the app. Your code does not even compile Because the first one is like you call a constructor and pass an array initializer, triggering a compiler error. Son Truong I have solutions for three of your four problems. First, WeakReference can be used to prevent leak. Second, you can absolutely use this inside fragments via getActivity. Fourth, you can cancel at any time using Executer and Future. Show 1 more comment.

Sergey Sergey Do you have any suggestions on how to implement the onProgressUpdate as well using the kotlin coroutines? Adnanhaider I am afraid it is not. Undefinedfunction executeAsyncTask is an extension function on CoroutineScope , you can create your own CoroutineScope and call executeAsyncTask on it. Show 3 more comments. Stidgeon 2, 8 8 gold badges 19 19 silver badges 28 28 bronze badges. Create a new Abstract class AsyncTaskCoroutine which takes input parameter and output parameter datatypes of-course these parameters are optional : import kotlinx.

Dispatchers import kotlinx. GlobalScope import kotlinx. Kumar Kumar 87 1 1 silver badge 4 4 bronze badges. Thanks — Darksymphony. Darksymphony I completely disagree with you, question is old in terms of using Java. If you are still using Java for Android, you need to rethink your choice. He wrote a very good alternative for AsynTask. Someone lazy came with Kotlin and forced it to android devs with it's funny commands : Maybe one day I will rethink.

But as long as we have a choice, I'll stay with Java — Darksymphony. Should work without any real problems. TheincredibleJan yes you are right, but works not without including Kotlin dependencies — Darksymphony. So, what's now? I heard Coroutines had "easy entry". Does that mean its easy to breach? I actually wrote two Medium stories about it: AsyncTas is deprecated now what AsyncTas is deprecated now what part 2 The first one is with Java and a workaround with Runnable, the second is a Kotlin and coroutines solution.