Android Adapter Simple Introduction to _android

Adapter in Android are useful when customizing display lists, such as Simpleadapter, whose constructors are:
Public Simpleadapter (context context, list> data, int resource, string[] from, int[] to)
The meaning of its various parameters:
1.context, context, simpleadapter Associated view, is generally the current activity,this
2.data, generic list, such as Arraylist,map or HashMap
3.resource, resource file, a r.layout, is the layout to display
4.from, an array, a key-value pair in the map.
A unique int-type identifier formed by a named ID in a 5.to,layout XML file
Like what:
Define a list in a listactivity:
list> people= new arraylist> ();
Map m=new HashMap ();
M.put ("name", "Tom");
M.put ("Age", "20");
People.add (m);
...
Simpleadapter adapter = new Simpleadapter (This,
(list>) feets, R.layout.main,
New string[] {"Name", "Age"}, new int[] {r.id.name,r.id.age});
Setlistadapter (adapter);
which
R.id.name,r.id.age is the two textview that are defined in an XML layout file to display name and age. There should be a ListView in the layout file. Or it can be defined in the program.
Also, note that you do not need to set the Setcontentview in Listactivity and the system is automatically loaded.