FragmentStatePagerAdapter implementation backed by Cursor data set.

CursorPagerAdapter.java

import android.app.Fragment;
import android.app.FragmentManager;
import android.database.Cursor;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

import universum.studios.android.pager.adapter.FragmentStatePagerAdapter;

/**
 * @author Martin Albedinsky
 */
public class CursorPagerAdapter extends FragmentStatePagerAdapter {

	@SuppressWarnings("unused")
	private static final String TAG = "CursorPagerAdapter";

	public interface PageFragment {

		void setPageId(long id);

		long getPageId();
	}

	private Cursor cursor;
	private int idColumnIndex;

	public CursorPagerAdapter(@NonNull FragmentManager fragmentManager) {
		super(fragmentManager);
	}

	public void changeCursor(@Nullable Cursor cursor) {
		final Cursor oldCursor = this.cursor;
		this.cursor = cursor;
		if (cursor != null && !cursor.isClosed()) {
			this.idColumnIndex = cursor.getColumnIndexOrThrow("_id");
		}
		notifyDataSetChanged();
		if (oldCursor != null && !oldCursor.isClosed()) {
			oldCursor.close();
		}
	}

	private boolean isCursorValid() {
		return cursor != null && !cursor.isClosed();
	}

	@Override
	public int getCount() {
		return isCursorValid() ? cursor.getCount() : 0;
	}

	@Override
	public long getItemId(int position) {
		return position >= 0 && position < getCount() && cursor.moveToPosition(position) ?
				cursor.getLong(idColumnIndex) :
				super.getItemId(position);
	}

	@Override
	public int getItemPosition(Object object) {
		if (object instanceof PageFragment && isCursorValid() && cursor.moveToFirst()) {
			final long pageId = ((PageFragment) object).getPageId();
			do {
				if (pageId == cursor.getLong(idColumnIndex)) {
					return cursor.getPosition();
				}
			} while (cursor.moveToNext());
		}
		return POSITION_NONE;
	}

	@NonNull
	@Override
	public Fragment getItem(int position) {
		if (!isCursorValid() || !cursor.moveToPosition(position)) {
			throw new IllegalStateException("Cannot present data from invalid cursor!");
		}
		// todo: instantiate your PageFragment implementation here and supply it all necessary data
		// todo: from the cursor including the corresponding page id as:
		// todo: PageFragment.setPageId(cursor.getLong(idColumnIndex));
		return new Fragment();
	}
}