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Listview tips:
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1.Don’t use wrap content.
       Never use wrap_content for a list view’s height attribute. A list is a scroll con-tainer, and by definition is infinitely large, so you should always let a ListView fill_parent (or let it otherwise expand itself, for example, using layout_weight).
2.Be careful with clickable list items .
       Generally, when you click a list item, the list item itself receives the clickevent—the
 view or container that’s the root element of the item layout. If you place a button inside  an item layout, the button steals the focus from the list item, which means while the button remains clickable, the list item itself can neither be focused nor clicked. You can mitigate this effect to at least let the entire list item be focusable again by setting  ListView.setItemsCanFocus(false), which will bring back the list highlight  when selecting that item. But any click handling must still be performed on a per-ele-ment basis inside your item layout.

3.Pay attention to getView performance
    List views can be performance killers. The getView method of an adapter is used to
render a list item and is called frequently. You should avoid doing expensive operations like view inflations, or at least cache them. Reuse views, and consider the ViewHolder pattern we introduced earlier.
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