Notifydatasetchanged not working

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For an ArrayAdapter , notifyDataSetChanged only works if you use the add , insert , remove , and clear on the Adapter. When an ArrayAdapter is constructed, it holds the reference for the List that was passed in. If you were to pass in a List that was a member of an Activity, and change that Activity member later, the ArrayAdapter is still holding a reference to the original List. The Adapter does not know you changed the List in the Activity. Your choices are: Use the functions of the ArrayAdapter to modify the underlying List add , insert , remove , clear , etc. Re-create the ArrayAdapter with the new List data. Uses a lot of resources and garbage collection.

Notifydatasetchanged not working

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I want to change background of fragment which is on viewpager but it shows effect after fragment moves. Is there any solution for this problem? The text was updated successfully, but these errors were encountered:. What does "it shows effect after fragment moves. Do you mean, you can't change background of view even if calling notifyDataSetChanged and swipe view pager 2, 3 times?

Notifydatasetchanged not working

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I have a adapter extends AbstractExpandableItemAdapter in fragment, and put List from outside, this data instance was only in adapter. I provide a public method in adapter to update data, but it doesn't work after data show in logcat. The text was updated successfully, but these errors were encountered:. I hava update my code like below like MyAddRemoveExpandableItemAdapter , and parents are all show but children all are not expand, how can i make it all expand default by some method just like notifyDataSetChanged?

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Re-create the ArrayAdapter with the new List data. I understand the cause of the problem. Comment Reblog Subscribe Subscribed. When an ArrayAdapter is constructed, it holds the reference for the List that was passed in. If you were to pass in a List that was a member of an Activity, and change that Activity member later, the ArrayAdapter is still holding a reference to the original List. Copy link. Is there any solution for this problem? Already have an account? You switched accounts on another tab or window. Making a method that recreate items in adapter. Do you mean, you can't change background of view even if calling notifyDataSetChanged and swipe view pager 2, 3 times? No matter whether using this library or not, if you want recreating fragment on calling notifyDataSetChanged , you have to override getItemPosition method of adapter and return appropriate value. I want to change background of fragment which is on viewpager but it shows effect after fragment moves. Skip to content.

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If you were to pass in a List that was a member of an Activity, and change that Activity member later, the ArrayAdapter is still holding a reference to the original List. Could you show me a sample code to reproduce the problem? Do you mean, you can't change background of view even if calling notifyDataSetChanged and swipe view pager 2, 3 times? The text was updated successfully, but these errors were encountered:. Create your own class derived from BaseAdapter and ListAdapter that allows changing of the underlying List data structure. Already on GitHub? This library supports 'notifyDataSetChanged' only for changing order of items or size of list. Sign in to comment. Sign me up. Is there any solution for this problem? Using event bus or content-provider, make activity post Changing background color event , and handle it in fragment to change view's behavior.