Listview optimization scheme

1. If the custom adapter is used, check whether the contentview parameter passed in by the method is null in the getview method. If it is null, create the contentview and return it, if it is not null, use it directly. Create as few views as possible in this method.

2. Set tag (settag () for contentview and input a viewholder object to cache the data to be displayed, so that the image data can be asynchronously loaded.

3. If the listview needs to display a large number of items, it is necessary to consider paging loading. For example, if you want to display a total of 100 or more items, we can consider loading 20 items first and loading the next 20 items when the user pulls them to the bottom of the list.

Listview optimization scheme