in.srain.cube.views.list

Class ViewHolderBase<ItemDataType>

java.lang.Object

in.srain.cube.views.list.ViewHolderBase<ItemDataType>

Type Parameters:

ItemDataType - the generic type of the data in each item

public abstract class ViewHolderBase<ItemDataType>
extends java.lang.Object

As described in

http://developer.android.com/training/improving-layouts/smooth-scrolling.html

Using A View Holder in ListView getView() method is a good practice in using ListView;

This class encapsulate the base operate of a View Holder: createView / showData

Field Summary

Fields

Modifier and Type	Field and Description
protected android.view.View	mCurrentView
protected int	mLastPosition
protected int	mPosition

Constructor Summary

Constructors

Constructor and Description
ViewHolderBase()

Method Summary

Methods

Modifier and Type	Method and Description
abstract android.view.View	createView(android.view.LayoutInflater layoutInflater) create a view from resource Xml file, and hold the view that may be used in displaying data.
void	setItemData(int position, android.view.View view)
abstract void	showData(int position, ItemDataType itemData) using the held views to display data
boolean	stillHoldLastItemData() Check if the View Holder is still display the same data after back to screen.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

mLastPosition

protected int mLastPosition

mPosition

protected int mPosition

mCurrentView

protected android.view.View mCurrentView

Constructor Detail

ViewHolderBase

public ViewHolderBase()

Method Detail

createView

public abstract android.view.View createView(android.view.LayoutInflater layoutInflater)

create a view from resource Xml file, and hold the view that may be used in displaying data.

showData

public abstract void showData(int position,
            ItemDataType itemData)

using the held views to display data

setItemData

public void setItemData(int position,
               android.view.View view)

stillHoldLastItemData

public boolean stillHoldLastItemData()

Check if the View Holder is still display the same data after back to screen.

A view in a ListView or GridView may go down the screen and then back,

for efficiency, in getView() method, a convertView will be reused.

If the convertView is reused, View Holder will hold new data.