Menu
In the documentation on AsyncTask it gives the following as a rule related to threading:
- The task can be executed only once (an exception will be thrown if a second execution is attempted.)
All this means is that you have to create a new instance of the class every time you want to use it, right? In other words, it must be done like this:
new DownloadFilesTask().execute(url1, url2, url3); new DownloadFilesTask().execute(url4, url5, url6); Or conversely, you can NOT do the following:
DownloadFilesTask dfTask = new DownloadFilesTask(); dfTask.execute(url1, url2, url3); dfTask.execute(url4, url5, url6); Can someone verify this is an accurate interpretation?
I realize I pretty much just answered this for myself as I was typing this out... But it wasn't immediately obvious to me so I think this would be useful to have posted nonetheless.
864
Limitation Of AsyncTask There is a limit of how many tasks can be run simultaneously. Since AsyncTask uses a thread pool executor with max number of worker threads (128) and the delayed tasks queue has fixed size 10. If you try to execute more than 138 AsyncTasks the app will crash with java.
In summary, the three most common issues with AsyncTask are: Memory leaks. Cancellation of background work. Computational cost.
If you start an AsyncTask inside an Activity and you rotate the device, the Activity will be destroyed and a new instance will be created. But the AsyncTask will not die. It will go on living until it completes. And when it completes, the AsyncTask won't update the UI of the new Activity.
Methods of AsyncTaskwe can directly comminicate background operation using on doInBackground() but for the best practice, we should call all asyncTask methods . doInBackground(Params) − In this method we have to do background operation on background thread.
Can someone verify this is an accurate interpretation?
That is a very accurate interpretation.
63
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
