am.util.viewpager.adapter

类 FragmentRemovePagerAdapter

java.lang.Object

PagerAdapter

am.util.viewpager.adapter.FragmentRemovePagerAdapter

public abstract class FragmentRemovePagerAdapter
extends PagerAdapter

Implementation of PagerAdapter that represents each page as a Fragment that is persistently kept in the fragment manager as long as the user can return to the page.

This version of the pager is best for use when there are a handful of typically more static fragments to be paged through, such as a set of tabs. The fragment of each page the user visits will be kept in memory, though its view hierarchy may be destroyed when not visible. This can result in using a significant amount of memory since fragment instances can hold on to an arbitrary amount of state. For larger sets of pages, consider FragmentStatePagerAdapter.

When using FragmentPagerAdapter the host ViewPager must have a valid ID set.

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

Here is an example implementation of a pager containing fragments of lists:

The R.layout.fragment_pager resource of the top-level fragment is:

The R.layout.fragment_pager_list resource containing each individual fragment's layout is:

构造器概要

构造器

构造器和说明
FragmentRemovePagerAdapter(FragmentManager fm)

方法概要

限定符和类型	方法和说明
void	destroyItem(android.view.ViewGroup container, int position, Object object)
void	finishUpdate(android.view.ViewGroup container)
abstract Fragment	getItem(int position) Return the Fragment associated with a specified position.
long	getItemId(int position) Return a unique identifier for the item at the given position.
Object	instantiateItem(android.view.ViewGroup container, int position)
boolean	isViewFromObject(android.view.View view, Object object)
void	removeAll() Remove all item
void	restoreState(android.os.Parcelable state, ClassLoader loader)
android.os.Parcelable	saveState()
void	setPrimaryItem(android.view.ViewGroup container, int position, Object object)
void	startUpdate(android.view.ViewGroup container)

从类继承的方法 java.lang.Object

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

构造器详细资料

FragmentRemovePagerAdapter

public FragmentRemovePagerAdapter(FragmentManager fm)

方法详细资料

getItem

public abstract Fragment getItem(int position)

Return the Fragment associated with a specified position.

startUpdate

public void startUpdate(android.view.ViewGroup container)

instantiateItem

public Object instantiateItem(android.view.ViewGroup container,
                              int position)

destroyItem

public void destroyItem(android.view.ViewGroup container,
                        int position,
                        Object object)

setPrimaryItem

public void setPrimaryItem(android.view.ViewGroup container,
                           int position,
                           Object object)

finishUpdate

public void finishUpdate(android.view.ViewGroup container)

isViewFromObject

public boolean isViewFromObject(android.view.View view,
                                Object object)

saveState

public android.os.Parcelable saveState()

restoreState

public void restoreState(android.os.Parcelable state,
                         ClassLoader loader)

getItemId

public long getItemId(int position)

Return a unique identifier for the item at the given position.

The default implementation returns the given position. Subclasses should override this method if the positions of items can change.

参数:

position - Position within this adapter

返回:

Unique identifier for the item at position

removeAll

public void removeAll()

Remove all item