GridPagerAdapter

OPTION_DISABLE_PARALLAX

public static final int OPTION_DISABLE_PARALLAX

Disables zooming and parallax scrolling of the background.

Constant Value: 1 (0x00000001)

PAGE_DEFAULT_OPTIONS

public static final int PAGE_DEFAULT_OPTIONS

Default background options. Parallax scrolling is enabled.

Constant Value: 0 (0x00000000)

BACKGROUND_NONE

public static final Drawable BACKGROUND_NONE

This value indicates that no background should drawn. See getBackgroundForRow(int) and getBackgroundForPage(int, int) for specific effects.

POSITION_NONE

public static final Point POSITION_NONE

POSITION_UNCHANGED

public static final Point POSITION_UNCHANGED

GridPagerAdapter

public GridPagerAdapter ()

destroyItem

public abstract void destroyItem (ViewGroup container, 
                int row, 
                int column, 
                Object object)

Removes a page for the given position. The adapter is responsible for removing the view from its container, although it only must ensure this is done by the time it returns from finishUpdate(ViewGroup).

finishUpdate

public void finishUpdate (ViewGroup container)

Called when the a change in the shown pages has been completed. At this point you must ensure that all of the pages have actually been added or removed from the container as appropriate.

getBackgroundForPage

public Drawable getBackgroundForPage (int row, 
                int column)

Provides content to be displayed as background for a specific page.

The return value BACKGROUND_NONE indicates that there is no page-specific background. and the row background should be used (if any).

The return value of this method can be cached. notifyPageBackgroundChanged(int, int) may be used to invalidate a previously returned value. getBackgroundForPage(int, int) will then be called to request the new value when necessary.

getBackgroundForRow

public Drawable getBackgroundForRow (int row)

Provides content to be displayed as the default background for all pages on the given row.

The return value BACKGROUND_NONE causes no background to be displayed, except for those applied by getBackgroundForPage(int, int).

The return value of this method can be cached. notifyRowBackgroundChanged(int) may be used to invalidate a previously returned value. getBackgroundForRow(int) will then be called to request the new value when necessary.

getColumnCount

public abstract int getColumnCount (int row)

Returns the maximum number of columns for each row. The number of columns may vary by row.

getCurrentColumnForRow

public int getCurrentColumnForRow (int row, 
                int currentColumn)

Returns the column to arrive at when navigating vertically to the specified row.

The default implementation simply returns 0.

getItemPosition

public Point getItemPosition (Object object)

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 all items have been removed and always returns POSITION_NONE. This causes all fragments to be detached and re-attached as needed.

getOptionsForPage

public int getOptionsForPage (int row, 
                int column)

Provides a set of features to apply to a page background. The return value should be a combination of one or more of the following, combined via bitwise-or:

• OPTION_DISABLE_PARALLAX

getRowCount

public abstract int getRowCount ()

Returns the number of rows available.

instantiateItem

public abstract Object instantiateItem (ViewGroup container, 
                int row, 
                int column)

Creates the page for the given position. The adapter is responsible for adding the view to the container given here, although it only must ensure this is done by the time it returns from finishUpdate(ViewGroup)

isViewFromObject

public abstract boolean isViewFromObject (View view, 
                Object object)

Determines whether a page View is associated with a specific key object as returned by instantiateItem(ViewGroup, int, int). This method is required for a PagerAdapter to function properly.

notifyDataSetChanged

public void notifyDataSetChanged ()

This method should be called by the application if the data backing this adapter has changed and associated views should update.

notifyPageBackgroundChanged

public void notifyPageBackgroundChanged (int row, 
                int column)

This method should be called if the value returned by getBackgroundForPage(int, int) or options returned by getOptionsForPage(int, int) change. Any cached value are removed and the the new value will be requested when necessary.

notifyRowBackgroundChanged

public void notifyRowBackgroundChanged (int row)

This method should be called if the value returned by getBackgroundForRow(int) changes. Any cached value is removed and the the new value will be requested when necessary.

registerDataSetObserver

public void registerDataSetObserver (DataSetObserver observer)

Register an observer to receive callbacks related to the adapter's data changing.

restoreState

public void restoreState (Parcelable savedState, 
                ClassLoader classLoader)

Restores the previously saved state of this adapter.

saveState

public Parcelable saveState ()

Saves the current state of this adapter.

setCurrentColumnForRow

public void setCurrentColumnForRow (int row, 
                int currentColumn)

Called to inform the adapter of which column is now current for the given row. This information could be stored and used to implement getCurrentColumnForRow(int, int). The default implementation does nothing.

startUpdate

public void startUpdate (ViewGroup container)

Called when a change in the shown pages is going to start being made.

unregisterDataSetObserver

public void unregisterDataSetObserver (DataSetObserver observer)

Unregister an observer from callbacks related to the adapter's data changing.

applyItemPosition

protected void applyItemPosition (Object object, 
                Point position)

Called after getItemPosition(Object) to allow superclasses to update their internal bookkeeping if a subclass has overridden getItemPosition(Object).