Home/ Questions/Q 7643207
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-31T09:23:24+00:00

I’ve got an app that uses ListActivity to give users a list of actions.

  • 0

I’ve got an app that uses ListActivity to give users a list of actions. When they click one I use an Intent to launch a separate activity.

My problem is that the actions that the app performs take about 20 seconds to finish, and since I don’t want the user to receive that nasty ANR dialog, I tried to use AsyncTask to present them with a loading screen in the mean time. I tried using setContentView(R.layout.loading); on onPreExecute(), but it throws a NullPointerException which as far as I have figured out is due to the fact that loading.xml is not “a ListView whose ID is android.R.id.list“.

So what can I do now? How can I show that loading screen? Is there a way around this pretty annoying situation? Any help would be greatly appreciated. Thanks!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I am not sure exactly what your use case is; you have a list of items that are populated immediately, and upon selecting one an action is taken? The action that is taken is to launch another Activity which performs background processing?

    Or does it take that long to populate the list of actions?

    If the former, you can use an AsyncTask for the long-running activity instead of an Intent to launch another Activity: in the callback you get for the click on the item in question, you would create the AsyncTask, and in doInBackground you would perform the long-running activity, with onPostExecute refreshing or manipulating your list as necessary.

    Another thing to consider is using a dialog box to show a loading screen, if the loading is required to happen before you launch a new Activity.

    If you can further describe your use case, I can help you more.

    • 0