CODEWITHSUNDEEP
android
user3062224
user3062224

Reputation: 21

Android ViewPager, Fragment, and AsyncTask

First and foremost:

*I have Fragment classes which serve as a class for each page in the viewPager.

*Each fragment class has its own AsyncTask.

My problem here is that the AsyncTask's of each fragment class are called at once when the class that has the ViewPager is called. I know because in each of the AsyncTask's onPreExecute() i put a ProgressDialog. I am expecting that every time I swipe and go to another page, that should be time when the AsyncTask of each of the fragment class will load, not on the first page all at once.

I tried putting the AsyncTask.execute() on the onActivityCreated(Bundle) but still nothing changes.

Also, every time I swipe pages, the ProgressDialog inside the AsyncTask's onPreExecute() shows up. I placed a Log in every onPreExecute() but surprisingly it prints one time only ever since theviewPager` is called.

Upvotes: 0

Views: 392

Answers (1)

Sanders
Sanders

Reputation: 448

If you want each AsyncTask started only when your Fragment is visible, you must execute it from either the Fragment's onStart() or onResume() method. The reason they're all being called at the same time is because a Fragment's onActivityCreated() is called when the parent Activity is created, not when the Fragment is visible. Take a look at the lifecycle of a Fragment to see when it would be most appropriate to execute your AsyncTask.

Additionally, since you are using Fragments, I would highly suggest using a Loader as opposed to an AsyncTask. They are much easier to manage alongside of a Fragment.

Upvotes: 1

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