Yet another getView called multiple times
The problem was in the Layout of the ListView.
The parameter layout_width
was set to wrap_content
when I changed it to fill_parent
the problem disappeared...
getView() Called multiple times for same position
It's normal that the index 0 view is requested multiple times. It is needed for measure/layout purposes.
You can put a debugger breakpoint in getView()
to learn why the adapter getView()
was called in each case by observing the call stack.
Make sure your ListView
is not in a layout that requires multiple measure/layout passes, such as LinearLayout
with weights or RelativeLayout
with complex constraints.
Make your getView()
return a view as quickly as possible for performance reasons.
custom listview adapter getView method being called multiple times, and in no coherent order
This is not an issue, there is absolutely no guarantee on the order in which getView()
will be called nor how many times. In your particular case you are doing the worst thing possible with a ListView
by giving it a height=wrap_content
. This forces ListView
to measure a few children out of the adapter at layout time, to know how big it should be. This is what provides ListView
with the convertViews
you see passed to getView()
even before you scroll.
Adapter getView is called multiple times with position 0
Okay, I figured out the issue by expanding ListView as much possible. Meaning to say, giving a dynamic full height so that all item becomes visible.
I followed the below solution:
Calculate the size of a list view or how to tell it to fully expand
Getview Called multiple times in android
Make your listview height equal to fill_parent and try it again..
Yet Another ListView custom adapter getView called way too many times
Turns out the culprit was in the ListFragment onCreate. Dynamically setting the ListFragment's root LinearLayout to width of 0 was causing the issue. Commenting this out fixed the adapter problem.
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
inflater.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ViewGroup mRootView = (ViewGroup) inflater.inflate(R.layout.masonry_list, container, false);
if(model != null && model.getFragmentWeight() != 0)
{
mRootView.setLayoutParams(new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, model.getFragmentWeight()));
}
return mRootView;
}
Listview - Getview called multiple times
I think its not about textview.
The getView is always called multiple times. If you have 10 items on the screen to be shown, the getView going to be called 15 times, because the android creating views that are not on the screen. It`s good, because when the user start scrolling, it is not going to lagging.
After the user left the item, the view get`s recycle and reused by the adapter. Lets say, you have a list with 10000000 item, but you have 5 item on the screen at all time. In this case - to save power, and improve performance - the android going to create 10 list item, and this 10 item is going to recylce and refresh by content.
ViewHolder pattern
Please read this and use this patter to improve your code performance:
http://developer.android.com/training/improving-layouts/smooth-scrolling.html
Google about ListView:
http://developer.android.com/guide/topics/ui/layout/listview.html
Tutorials:
http://developer.xamarin.com/guides/android/user_interface/working_with_listviews_and_adapters/
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