belongs to Maven artifact androidx.legacy:legacy-support-v13:1.0.0-alpha1

FragmentPagerAdapter

public abstract class FragmentPagerAdapter
extends PagerAdapter

java.lang.Object
   ↳ androidx.viewpager.widget.PagerAdapter
     ↳ androidx.legacy.app.FragmentPagerAdapter


This class is deprecated.
Use FragmentPagerAdapter instead.

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:

public class FragmentPagerSupport extends Activity {
    static final int NUM_ITEMS = 10;

    MyAdapter mAdapter;

    ViewPager mPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_pager);

        mAdapter = new MyAdapter(getFragmentManager());

        mPager = (ViewPager)findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);

        // Watch for button clicks.
        Button button = (Button)findViewById(R.id.goto_first);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mPager.setCurrentItem(0);
            }
        });
        button = (Button)findViewById(R.id.goto_last);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mPager.setCurrentItem(NUM_ITEMS-1);
            }
        });
    }

    public static class MyAdapter extends FragmentPagerAdapter {
        public MyAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public int getCount() {
            return NUM_ITEMS;
        }

        @Override
        public Fragment getItem(int position) {
            return ArrayListFragment.newInstance(position);
        }
    }

    public static class ArrayListFragment extends ListFragment {
        int mNum;

        /**
         * Create a new instance of CountingFragment, providing "num"
         * as an argument.
         */
        static ArrayListFragment newInstance(int num) {
            ArrayListFragment f = new ArrayListFragment();

            // Supply num input as an argument.
            Bundle args = new Bundle();
            args.putInt("num", num);
            f.setArguments(args);

            return f;
        }

        /**
         * When creating, retrieve this instance's number from its arguments.
         */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            mNum = getArguments() != null ? getArguments().getInt("num") : 1;
        }

        /**
         * The Fragment's UI is just a simple text view showing its
         * instance number.
         */
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
            View tv = v.findViewById(R.id.text);
            ((TextView)tv).setText("Fragment #" + mNum);
            return v;
        }

        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            setListAdapter(new ArrayAdapter<String>(getActivity(),
                    android.R.layout.simple_list_item_1, Cheeses.sCheeseStrings));
        }

        @Override
        public void onListItemClick(ListView l, View v, int position, long id) {
            Log.i("FragmentList", "Item clicked: " + id);
        }
    }
}

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical" android:padding="4dip"
        android:gravity="center_horizontal"
        android:layout_width="match_parent" android:layout_height="match_parent">

    <androidx.viewpager.widget.ViewPager
            android:id="@+id/pager"
            android:layout_width="match_parent"
            android:layout_height="0px"
            android:layout_weight="1">
    </androidx.viewpager.widget.ViewPager>

    <LinearLayout android:orientation="horizontal"
            android:gravity="center" android:measureWithLargestChild="true"
            android:layout_width="match_parent" android:layout_height="wrap_content"
            android:layout_weight="0">
        <Button android:id="@+id/goto_first"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:text="@string/first">
        </Button>
        <Button android:id="@+id/goto_last"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:text="@string/last">
        </Button>
    </LinearLayout>
</LinearLayout>

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:drawable/gallery_thumb">

    <TextView android:id="@+id/text"
        android:layout_width="match_parent" android:layout_height="wrap_content"
        android:gravity="center_vertical|center_horizontal"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="@string/hello_world"/>

    <!-- The frame layout is here since we will be showing either
    the empty view or the list view.  -->
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_weight="1" >
        <!-- Here is the list. Since we are using a ListActivity, we
             have to call it "@android:id/list" so ListActivity will
             find it -->
        <ListView android:id="@android:id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:drawSelectorOnTop="false"/>

        <!-- Here is the view to show if the list is emtpy -->
        <TextView android:id="@android:id/empty"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="No items."/>

    </FrameLayout>

</LinearLayout>

Summary

Inherited constants

Public constructors

FragmentPagerAdapter(FragmentManager fm)

This constructor is deprecated. Use FragmentPagerAdapter instead.

Public methods

void destroyItem(ViewGroup container, int position, Object object)

This method is deprecated. Use FragmentPagerAdapter instead.

void finishUpdate(ViewGroup container)

This method is deprecated. Use FragmentPagerAdapter instead.

abstract Fragment getItem(int position)

This method is deprecated. Use FragmentPagerAdapter instead.

long getItemId(int position)

This method is deprecated. Use FragmentPagerAdapter instead.

Object instantiateItem(ViewGroup container, int position)

This method is deprecated. Use FragmentPagerAdapter instead.

boolean isViewFromObject(View view, Object object)

This method is deprecated. Use FragmentPagerAdapter instead.

void restoreState(Parcelable state, ClassLoader loader)

This method is deprecated. Use FragmentPagerAdapter instead.

Parcelable saveState()

This method is deprecated. Use FragmentPagerAdapter instead.

void setPrimaryItem(ViewGroup container, int position, Object object)

This method is deprecated. Use FragmentPagerAdapter instead.

void startUpdate(ViewGroup container)

This method is deprecated. Use FragmentPagerAdapter instead.

Inherited methods

Public constructors

FragmentPagerAdapter

FragmentPagerAdapter (FragmentManager fm)

This constructor is deprecated.
Use FragmentPagerAdapter instead.

Parameters
fm FragmentManager

Public methods

destroyItem

void destroyItem (ViewGroup container, 
                int position, 
                Object object)

This method is deprecated.
Use FragmentPagerAdapter instead.

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 finishUpdate(ViewGroup).

Parameters
container ViewGroup: The containing View from which the page will be removed.

position int: The page position to be removed.

object Object: The same object that was returned by PagerAdapter.instantiateItem(View, int).

finishUpdate

void finishUpdate (ViewGroup container)

This method is deprecated.
Use FragmentPagerAdapter instead.

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.

Parameters
container ViewGroup: The containing View which is displaying this adapter's page views.

getItem

Fragment getItem (int position)

This method is deprecated.
Use FragmentPagerAdapter instead.

Return the Fragment associated with a specified position.

Parameters
position int

Returns
Fragment

getItemId

long getItemId (int position)

This method is deprecated.
Use FragmentPagerAdapter instead.

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 int: Position within this adapter

Returns
long Unique identifier for the item at position

instantiateItem

Object instantiateItem (ViewGroup container, 
                int position)

This method is deprecated.
Use FragmentPagerAdapter instead.

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 finishUpdate(ViewGroup).

Parameters
container ViewGroup: The containing View in which the page will be shown.

position int: The page position to be instantiated.

Returns
Object Returns an Object representing the new page. This does not need to be a View, but can be some other container of the page.

isViewFromObject

boolean isViewFromObject (View view, 
                Object object)

This method is deprecated.
Use FragmentPagerAdapter instead.

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

Parameters
view View: Page View to check for association with object

object Object: Object to check for association with view

Returns
boolean true if view is associated with the key object object

restoreState

void restoreState (Parcelable state, 
                ClassLoader loader)

This method is deprecated.
Use FragmentPagerAdapter instead.

Restore any instance state associated with this adapter and its pages that was previously saved by saveState().

Parameters
state Parcelable: State previously saved by a call to saveState()

loader ClassLoader: A ClassLoader that should be used to instantiate any restored objects

saveState

Parcelable saveState ()

This method is deprecated.
Use FragmentPagerAdapter instead.

Save any instance state associated with this adapter and its pages that should be restored if the current UI state needs to be reconstructed.

Returns
Parcelable Saved state for this adapter

setPrimaryItem

void setPrimaryItem (ViewGroup container, 
                int position, 
                Object object)

This method is deprecated.
Use FragmentPagerAdapter instead.

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. This method will not be invoked when the adapter contains no items.

Parameters
container ViewGroup: The containing View from which the page will be removed.

position int: The page position that is now the primary.

object Object: The same object that was returned by PagerAdapter.instantiateItem(View, int).

startUpdate

void startUpdate (ViewGroup container)

This method is deprecated.
Use FragmentPagerAdapter instead.

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

Parameters
container ViewGroup: The containing View which is displaying this adapter's page views.