Android--adapter

Android--adapter

2. Basic concepts

   Adapter (adapter), which transforms the interface of a class into an interface that the client expects, so that two classes that would otherwise not work together because of an interface mismatch can work together. Obviously , the existence of Adapter is to cooperate with the two different parts, so that they can coordinate their work. In Android ,Adapter is the link between the foreground UI and the underlying data, and the relationship between them can be expressed as.

3. Common Adapter

   Adapter itself is just an interface, it derives ListAdapter and the Spinneradapter two sub-interfaces, where ListAdapter to be Abslistview provides list items, while Spinneradapter to be Absspinner provides list items. The inheritance relationship of the Adapter interface and its implementation class is as shown.

    

         These are more commonly used adapter

　　

　　

1. Arrayadapter<t>	any type (T) Array Adapter
   baseadapt Er	< Span style= "font-family: the song Body;" It implements the common base class adapter so it applies To listview ( interface Span style= "Font-family:times New Roman;" >) and spinner ( Span style= "font-family: the song Body;" > by implementing the specified spinneradapter interface
   cursorada Pter	< Span style= "font-family: the song Body;" > cursor The data exposed to control
   headerviewlistadapter	listview Header Span style= "font-family: the song Body;" > control
   ListAdapter	extends the Adapter , is Listviewts_ a bridge between list data
   Resourcecursoradapter	created in XML defined in the file. views
   simpleada Pter	< Span style= "font-family: the song Body;" The static data is mapped to xml file defined It's very powerful.
   simplecursoradapter	cursor columns in the map to xml of the file definition textview imageview
   Spinneradapter	extends the Adapter , is Spinnerts_ the bridge between data
   Wrapperlistadapter	include a different list Adapter the list Adapter

Android--adapter