How to manage activities in Android?

问题

I identified a problem in changing one activity using tab. In one tab activity I'm adding data to my SQLite database, and in the other tab activity I am displaying them using listview(array adapter). But when I come back to add data after adding new items to SQLite, the newly added records are not updated in my listview.

How do I fix this?

回答1:

You seem to be pulling the list data from a DB. Is there a reason why you are using an ArrayAdapter instead of a CursorAdapter?

Anyway, you should call notifyDataSetChanged() on your list adapter when the data has changed so it can refresh the view.

回答2:

you can add code to update your listview (via notifyDataSetChanged or some such) by overriding the onResume() method in your activity which is called whenever the activity is brought back to the foreground. See http://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle

来源：https://stackoverflow.com/questions/3324467/how-to-manage-activities-in-android