listview（ListView）.docVIP

listview（ListView） First, in the development of Android ListView is a common component, it to vertical list displayed in the form of specific content, and according to the length of adaptive data display. Two in the list, each line is a item item display needs three a list of elements: 1.ListVeiw is used to display a list of View. 2. adapter is used to map data into the ListView medium. 3. specific data will be mapped strings, images, or basic components. Three, according to the type of adapter list, the list is divided into four types, ArrayAdapter, SimpleAdapter, SimpleCursorAdapter and universal BaseAdapter 1.ArrayAdapter is the most simple, can only display a line of words. ListView = new ListView (this); ListView.setAdapter (New ArrayAdapterStringthis, android.R.layout.simple_expandable_list_item_1, getData) ()); SetContentView (listView); The structure of the ArrayAdapter requires three parameters, followed by this, the layout file (note layout file described here is a list of every line layout, android.R.layout.simple_list_item_1 layout file is defined system only shows a line of text data source (a List set). 2.SimpleAdapter has extended the best, you can customize a variety of effects. You can put on ImageView (picture), you can also put on Button (button), CheckBox (check box) and so on. Can be directly inherited from ListActivity, ListActivity and general Activity is not much difference, different is the display of the ListView to do a lot of optimization shows. SimpleAdapter adapter SimpleAdapter (this = new, (getData), R.layout.vlist, New String[]{title, info, img}, tablename New int[]{R.id.title, R.id.info, R.id.img}); resource reference SetListAdapter (adapter); The use of simpleAdapter data are generally composed of HashMap List, each line of each section corresponds to the ListView of the list. Each key mapping the HashMap data into the layout file on the corresponding ID component. Because there is no corresponding file system layout is available,