Mega Code Archive
Adapter that simply returns row views from a list
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//package pl.ppsoft.fixlang.common;
import java.util.ArrayList;
import java.util.List;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
/**
* Adapter that simply returns row views from a list.
*
* If you supply a size, you must implement newView(), to
* create a required view. The adapter will then cache these
* views.
*
* If you supply a list of views in the constructor, that
* list will be used directly. If any elements in the list
* are null, then newView() will be called just for those
* slots.
*
* Subclasses may also wish to override areAllItemsEnabled()
* (default: false) and isEnabled() (default: false), if some
* of their rows should be selectable.
*
* It is assumed each view is unique, and therefore will not
* get recycled.
*
* Note that this adapter is not designed for long lists. It
* is more for screens that should behave like a list. This
* is particularly useful if you combine this with other
* adapters (e.g., SectionedAdapter) that might have an
* arbitrary number of rows, so it all appears seamless.
*/
public class ListViewAdapter extends BaseAdapter {
private List<View> views=null;
/**
* Constructor creating an empty list of views, but with
* a specified count. Subclasses must override newView().
*/
public ListViewAdapter(int count) {
super();
views=new ArrayList<View>(count);
for (int i=0;i<count;i++) {
views.add(null);
}
}
/**
* Constructor wrapping a supplied list of views.
* Subclasses must override newView() if any of the elements
* in the list are null.
*/
public ListViewAdapter(List<View> views) {
super();
this.views=views;
}
/**
* Get the data item associated with the specified
* position in the data set.
* @param position Position of the item whose data we want
*/
@Override
public Object getItem(int position) {
return(views.get(position));
}
/**
* How many items are in the data set represented by this
* Adapter.
*/
@Override
public int getCount() {
return(views.size());
}
/**
* Returns the number of types of Views that will be
* created by getView().
*/
@Override
public int getViewTypeCount() {
return(getCount());
}
/**
* Get the type of View that will be created by getView()
* for the specified item.
* @param position Position of the item whose data we want
*/
@Override
public int getItemViewType(int position) {
return(position);
}
/**
* Are all items in this ListAdapter enabled? If yes it
* means all items are selectable and clickable.
*/
@Override
public boolean areAllItemsEnabled() {
return(false);
}
/**
* Returns true if the item at the specified position is
* not a separator.
* @param position Position of the item whose data we want
*/
@Override
public boolean isEnabled(int position) {
return true;
}
/**
* Get a View that displays the data at the specified
* position in the data set.
* @param position Position of the item whose data we want
* @param convertView View to recycle, if not null
* @param parent ViewGroup containing the returned View
*/
@Override
public View getView(int position, View convertView,
ViewGroup parent) {
View result=views.get(position);
if (result==null) {
result=newView(position, parent);
views.set(position, result);
}
return(result);
}
/**
* Get the row id associated with the specified position
* in the list.
* @param position Position of the item whose data we want
*/
@Override
public long getItemId(int position) {
return(position);
}
/**
* Create a new View to go into the list at the specified
* position.
* @param position Position of the item whose data we want
* @param parent ViewGroup containing the returned View
*/
protected View newView(int position, ViewGroup parent) {
throw new RuntimeException("You must override newView()!");
}
}
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