Android learning notes: Custom common ListView/GridView to implement the ListAdapter class

In android learning, blood is often used for medicine to ListView, and you also need to customize View display to implement ListAdapter interface

Therefore, a common CommonAdapter class is written to simplify the implementation of ListAdapter. extract the parts that Adaapter dynamically implements Based on layout. interface. the static part is made into a common method, and later development will focus only on the binding of the layout part. simplified development.

CommonAdapter class

View Code public class CommonAdapter extends BaseAdapter {

Private int customXmlName;
Protected ViewHolderModel Holder = null;
Protected final List <Map <String, Object> list;
Private final Context context;

/*
* Constructor setting Context and Data Source
*/
Public CommonAdapter (ViewHolderModel vModel ){

CustomXmlName = com.gz h. search. R. layout. list_item;
This. context = vModel. context;
This. list = vModel. list;
This. Holder = vModel;
}

@ Override
Public int getCount (){
Return list. size ();
}

Public void setLayout_Name (int name ){
If (name <= 0 ){
Return;
}
CustomXmlName = name;
}

@ Override
Public Object getItem (int position ){
If (position <list. size ()){
Return list. get (position );
} Else {

Return null;
}
}

@ Override
Public long getItemId (int position ){

Return position;
}

Public void HolderModel (ViewHolderModel vModel ){
This. Holder = vModel;
}

@ Override
Public View getView (int position, View convertView, ViewGroup parent ){

If (convertView = null ){
ConvertView = LayoutInflater. from (context). inflate (customXmlName,
Null );
Holder. InitViewHoler (convertView );
ConvertView. setTag (Holder );

} Else {
Holder = (ViewHolderModel) convertView. getTag ();
}
Holder. SetViewHolerValues (convertView, position );
Return convertView;
}

}

CustomXmlName = com.gz h. search. R. layout. list_item: indicates the default layout.

Java Holder abstract base class corresponding to ViewHolderModel layout

 

View Code/* initialize ItemView
* Set View
*/
Interface IViewHolderController {
/*
* Initialization
*/
Void InitViewHoler (View convertView );

/*
* Set the display content
*/
Void SetViewHolerValues (View convertView, int position );
}

Public abstract class ViewHolderModel implements IViewHolderController {
Public ViewHolderModel Holder = null;
Protected List <Map <String, Object> list;
Protected Context context;

Public ViewHolderModel (Context context, List <Map <String, Object> list ){
This. context = context;
This. list = list;

}
}

You only need to implement the abstract class ViewHolderModel to complete the development of the custom Adapter.

Example:

Implementation: ViewHolderModel base class

 

 

Public class HolderView extends ViewHolderModel {

Private ImageView itemLeftImage;
Private TextView itemText;
Private ImageView itemRightImage;
Private Button itemButton;

Public HolderView (Context context, List <Map <String, Object> list ){
Super (context, list );

// TODO Auto-generated constructor stub
}

@ Override
Public void InitViewHoler (View convertView ){
HolderView viewHolder = (HolderView) Holder;
ViewHolder. itemLeftImage = (ImageView) convertView
. FindViewById (R. id. item_left );
ViewHolder. itemText = (TextView) convertView
. FindViewById (R. id. item_text );
ViewHolder. itemRightImage = (ImageView) convertView
. FindViewById (R. id. item_right );
ViewHolder. itemButton = (Button) convertView. findViewById (R. id. btnOK );
}

/*
* (Non-Javadoc)
*
* @ See
* Com.gz h. common. IViewHolderController # SetViewHolerValues (android. view.
* View, int)
*/
@ Override
Public void SetViewHolerValues (View convertView, int position ){
HolderView viewHolder = (HolderView) Holder;
Map <String, Object> item = list. get (position );

ViewHolder. itemLeftImage. setImageResource (Integer. parseInt (item. get (
"Left"). toString ()));
ViewHolder. itemText. setText (item. get ("Text"). toString ());
ViewHolder. itemRightImage. setImageResource (Integer. parseInt (item. get (
"Right"). toString ()));
ViewHolder. itemButton. setTag (position );

}
}