me.tatarka.shard.pager

Class ShardPagerAdapter

java.lang.Object

PagerAdapter

me.tatarka.shard.pager.ShardPagerAdapter

public abstract class ShardPagerAdapter
extends PagerAdapter

Implementation of PagerAdapter that represents each page as a Shard.

Subclasses only need to implement getItem(int) and #getCount() to have a working adapter.

ViewPager#getOffscreenPageLimit() number of shards will be kept in memory. Otherwise their state will be saved and the shard destroyed. The current shard will be in the resumed state and all other shards will be in the started state. You must override getItemPosition(Shard) if you want to be able to dynamically change the contents on a #notifyDataSetChanged().

Constructor Summary

Constructors

Constructor and Description
ShardPagerAdapter(Context context)
ShardPagerAdapter(ShardOwner owner)

Method Summary

Modifier and Type	Method and Description
void	destroyItem(ViewGroup container, int position, java.lang.Object object)
abstract Shard	getItem(int position)
int	getItemPosition(java.lang.Object object)
int	getItemPosition(Shard shard) Called when the host view is attempting to determine if an item's position has changed.
java.lang.Object	instantiateItem(ViewGroup container, int position)
boolean	isViewFromObject(View view, java.lang.Object object)
void	restoreState(Parcelable state, java.lang.ClassLoader loader)
Parcelable	saveState()
void	setPrimaryItem(ViewGroup container, int position, java.lang.Object object)

Methods inherited from class java.lang.Object

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

Constructor Detail

ShardPagerAdapter

public ShardPagerAdapter(Context context)

ShardPagerAdapter

public ShardPagerAdapter(ShardOwner owner)

Method Detail

instantiateItem

public java.lang.Object instantiateItem(ViewGroup container,
                                        int position)

destroyItem

public void destroyItem(ViewGroup container,
                        int position,
                        java.lang.Object object)

getItemPosition

public final int getItemPosition(java.lang.Object object)

getItemPosition

public int getItemPosition(Shard shard)

Called when the host view is attempting to determine if an item's position has changed. Returns #POSITION_UNCHANGED if the position of the given item has not changed or #POSITION_NONE if the item is no longer present in the adapter.

The default implementation assumes that items will never change position and always returns #POSITION_UNCHANGED.

Parameters:

shard - Shard representing an item, previously returned by a call to #instantiateItem(View, int).

Returns:

shard's new position index from [0, #getCount()), #POSITION_UNCHANGED if the object's position has not changed, or #POSITION_NONE if the item is no longer present.

setPrimaryItem

public void setPrimaryItem(ViewGroup container,
                           int position,
                           java.lang.Object object)

getItem

public abstract Shard getItem(int position)

isViewFromObject

public final boolean isViewFromObject(View view,
                                      java.lang.Object object)

restoreState

public void restoreState(Parcelable state,
                         java.lang.ClassLoader loader)

saveState

public Parcelable saveState()