IT. Expert System.

Android Reference

FragmentPagerAdapter

android.support.v4.app

Class FragmentPagerAdapter

java.lang.Object
- android.support.v4.view.PagerAdapter
- - android.support.v4.app.FragmentPagerAdapter

```
public abstract class FragmentPagerAdapter
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 PagerAdapter.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:

Field Summary
- Fields inherited from class android.support.v4.view.PagerAdapter
  POSITION_NONE, POSITION_UNCHANGED

Constructor Summary

Constructors
Constructor and Description

FragmentPagerAdapter(FragmentManager fm)

Constructors
Constructor and Description
`FragmentPagerAdapter(FragmentManager fm)`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`destroyItem(ViewGroup container, int position, Object object)` Remove a page for the given position.
`void`	`finishUpdate(ViewGroup container)` Called when the a change in the shown pages has been completed.
`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(ViewGroup container, int position)` Create the page for the given position.
`boolean`	`isViewFromObject(View view, Object object)` Determines whether a page View is associated with a specific key object as returned by `PagerAdapter.instantiateItem(ViewGroup, int)`.
`void`	`restoreState(Parcelable state, ClassLoader loader)` Restore any instance state associated with this adapter and its pages that was previously saved by `PagerAdapter.saveState()`.
`Parcelable`	`saveState()` Save any instance state associated with this adapter and its pages that should be restored if the current UI state needs to be reconstructed.
`void`	`setPrimaryItem(ViewGroup container, int position, Object object)` Called to inform the adapter of which item is currently considered to be the "primary", that is the one show to the user as the current page.
`void`	`startUpdate(ViewGroup container)` Called when a change in the shown pages is going to start being made.

Methods inherited from class android.support.v4.view.PagerAdapter
destroyItem, finishUpdate, getCount, getItemPosition, getPageTitle, getPageWidth, instantiateItem, notifyDataSetChanged, setPrimaryItem, startUpdate

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FragmentPagerAdapter
```
public FragmentPagerAdapter(FragmentManager fm)
```
- Method Detail
  - getItem
```
public abstract Fragment getItem(int position)
```
    Return the Fragment associated with a specified position.
  - startUpdate
```
public void startUpdate(ViewGroup container)
```
    Description copied from class: PagerAdapter
    
    Called when a change in the shown pages is going to start being made.
    
    Overrides:
    
    startUpdate in class PagerAdapter
    
    Parameters:
    container - The containing View which is displaying this adapter's page views.
  - instantiateItem
```
public Object instantiateItem(ViewGroup container,
                     int position)
```
    Description copied from class: PagerAdapter
    
    Create 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 PagerAdapter.finishUpdate(ViewGroup).
    
    Overrides:
    
    instantiateItem in class PagerAdapter
    
    Parameters:
    container - The containing View in which the page will be shown.
    position - The page position to be instantiated.
    
    Returns:
    Returns an Object representing the new page. This does not need to be a View, but can be some other container of the page.
  - destroyItem
```
public void destroyItem(ViewGroup container,
               int position,
               Object object)
```
    Description copied from class: PagerAdapter
    
    Remove 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 PagerAdapter.finishUpdate(ViewGroup).
    
    Overrides:
    
    destroyItem in class PagerAdapter
    
    Parameters:
    container - The containing View from which the page will be removed.
    position - The page position to be removed.
    object - The same object that was returned by PagerAdapter.instantiateItem(View, int).
  - setPrimaryItem
```
public void setPrimaryItem(ViewGroup container,
                  int position,
                  Object object)
```
    Description copied from class: PagerAdapter
    
    Called to inform the adapter of which item is currently considered to be the "primary", that is the one show to the user as the current page.
    
    Overrides:
    
    setPrimaryItem in class PagerAdapter
    
    Parameters:
    container - The containing View from which the page will be removed.
    position - The page position that is now the primary.
    object - The same object that was returned by PagerAdapter.instantiateItem(View, int).
  - finishUpdate
```
public void finishUpdate(ViewGroup container)
```
    Description copied from class: PagerAdapter
    
    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.
    
    Overrides:
    
    finishUpdate in class PagerAdapter
    
    Parameters:
    container - The containing View which is displaying this adapter's page views.
  - isViewFromObject
```
public boolean isViewFromObject(View view,
                       Object object)
```
    Description copied from class: PagerAdapter
    
    Determines whether a page View is associated with a specific key object as returned by PagerAdapter.instantiateItem(ViewGroup, int). This method is required for a PagerAdapter to function properly.
    
    Specified by:
    
    isViewFromObject in class PagerAdapter
    
    Parameters:
    view - Page View to check for association with object
    object - Object to check for association with view
    
    Returns:
    true if view is associated with the key object object
  - saveState
```
public Parcelable saveState()
```
    Description copied from class: PagerAdapter
    
    Save any instance state associated with this adapter and its pages that should be restored if the current UI state needs to be reconstructed.
    
    Overrides:
    
    saveState in class PagerAdapter
    
    Returns:
    Saved state for this adapter
  - restoreState
```
public void restoreState(Parcelable state,
                ClassLoader loader)
```
    Description copied from class: PagerAdapter
    
    Restore any instance state associated with this adapter and its pages that was previously saved by PagerAdapter.saveState().
    
    Overrides:
    
    restoreState in class PagerAdapter
    
    Parameters:
    state - State previously saved by a call to PagerAdapter.saveState()
    loader - A ClassLoader that should be used to instantiate any restored objects
  - 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.
    
    Parameters:
    position - Position within this adapter
    
    Returns:
    Unique identifier for the item at position

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IT. Expert System.

Android Reference

FragmentPagerAdapter

Class FragmentPagerAdapter

Field Summary

Fields inherited from class android.support.v4.view.PagerAdapter

Constructor Summary

Method Summary

Methods inherited from class android.support.v4.view.PagerAdapter

Methods inherited from class java.lang.Object

Constructor Detail

FragmentPagerAdapter

Method Detail

getItem

startUpdate

instantiateItem

destroyItem

setPrimaryItem

finishUpdate

isViewFromObject

saveState

restoreState

getItemId

Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)

SQL

HTML

PHP

CSS

Java Script

MYSQL

JQUERY

VBS

REGEX

C

C++

C#

Design patterns

RFC (standard status)

RFC (proposed standard status)

RFC (draft standard status)

RFC (informational status)

RFC (experimental status)

RFC (best current practice status)

RFC (historic status)

RFC (unknown status)

IT dictionary