This contains many parts of the main fragment for an app I did that has an autoscrolling horizontal view pager on top of a list, very similar to Marvel. The reason I wanted to share this is because I think it is directly transferrable to solve some of the issues with the promo pager on the main screen. Notice the GestureDetector that is used. Th…

AllStoriesFragment.java

private static GestureDetector GESTURE_DETECTOR;

private static final long HEADLINE_SCROLL_DELAY = 5000;

private Timer mAutoScroller;

private ViewPager mHeadlinePager;

private HeadlineAdapter mHeadlineAdapter;

private static final long refreshInterval = 300 * 1000;

@Override
public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	if (GESTURE_DETECTOR == null) {
		GESTURE_DETECTOR = new GestureDetector(getActivity(), new PagerScrollDetector());
	}
}

/**
 * Activity Lifecycle Methods
 */
@Override
public void onActivityCreated(Bundle savedInstanceState) {
	super.onActivityCreated(savedInstanceState);
	// Take part in populating the action bar menu
	setHasOptionsMenu(true);

	// Setup the headline view
	if (mHeadlinePager == null) {
		mHeadlinePager = new ViewPager(getActivity());
	}

	mHeadlineAdapter = new HeadlineAdapter(getActivity(), null);
	mHeadlinePager.setAdapter(mHeadlineAdapter);

	// This is a really stupid hack and seems inefficient.  onActivityCreated(Bundle) is called whenever
	// the fragment is reattached to the Activity (tab reselected), so we get an IllegalStateException if
	// we don't set the list adapter to null first.
	setListAdapter(null);
	getListView().addHeaderView(mHeadlinePager);

	final float scale = getActivity().getResources().getDisplayMetrics().density;
	final float height = getActivity().getResources().getDimension(R.dimen.headline_height);

	AbsListView.LayoutParams params = new AbsListView.LayoutParams(
		AbsListView.LayoutParams.MATCH_PARENT,
		(int) (height * scale + 0.5f));
	mHeadlinePager.setLayoutParams(params);

	mHeadlinePager.setOnTouchListener(new View.OnTouchListener() {
		@Override
		public boolean onTouch(View v, MotionEvent event) {
			boolean result = v.onTouchEvent(event);

			// Stop the auto scrolling if the user manually scrolls
			if (mAutoScroller != null) {
				mAutoScroller.cancel();
				mAutoScroller = null;
			}

			if (GESTURE_DETECTOR.onTouchEvent(event)) {
				v.getParent().requestDisallowInterceptTouchEvent(true);
			} else {
				v.getParent().requestDisallowInterceptTouchEvent(false);
			}
			return result;
		}
	});

	mAdapter = new StoryAdapter(getActivity(), null);
	setListAdapter(mAdapter);

	getActivity().getSupportLoaderManager().initLoader(HEADLINE_LIST, null, this);
}

public void onDetach() {
	super.onDetach();
	setListAdapter(null);
}

@Override
public void onResume() {
	super.onResume();

	// Restart the timer
	if (mAutoScroller == null) {
		mAutoScroller = new Timer();
		mAutoScroller.scheduleAtFixedRate(new AutoScrollTimerTask(), 
				HEADLINE_SCROLL_DELAY, HEADLINE_SCROLL_DELAY);
	}

	// Refresh the stories
	updateStories(false);
}

@Override
public void onPause() {
	super.onPause();
	setRefreshButtonState(false);
	// Cancel the load stories task
	if (mLoadStoriesTask != null) {
		mLoadStoriesTask.cancel(true);
		mLoadStoriesTask = null;
	}
	// Cancel the timer
	if (mAutoScroller != null) {
		mAutoScroller.cancel();
		mAutoScroller = null;
	}
}

/**
 * Menu handling
 */
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
	inflater.inflate(R.menu.main_list, menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
	switch (item.getItemId()) {
		case R.id.refresh:
			updateStories(true);
			return true;
		default:
			return super.onOptionsItemSelected(item);
	}
}

/**
 * Data Updating Methods
 */

private void updateStories(boolean force) {
	// If we have no stories, update the cursors
	if (mLoadStoriesTask == null && force || 
			System.currentTimeMillis() - lastUpdateTime > refreshInterval) {
		// Look for new stories
		mLoadStoriesTask = new LoadStoriesTask();
		mLoadStoriesTask.execute();
	}
}

/**
 * Creates a story cursor and adapter and sets it
 * as the list adapter.
 */
final static String[] STORY_PROJECTION = {
	BaseColumns._ID,
	StoryColumns.GUID,
	StoryColumns.TYPE,
	StoryColumns.TITLE,
	StoryColumns.THUMB,
	StoryColumns.DATE,
	StoryColumns.CATEGORY_BADGE_COLOR,
	StoryColumns.CATEGORY_NAME,
	StoryColumns.AUTHOR
};

final static String[] HEADLINE_PROJECTION = {
	BaseColumns._ID,
	StoryColumns.GUID,
	StoryColumns.TYPE,
	StoryColumns.TITLE,
	StoryColumns.CATEGORY_BADGE_COLOR,
	StoryColumns.CATEGORY_NAME,
	StoryColumns.IMAGE
};

final static String STORY_SELECT = Story.TYPE + " = " + StoryType.GENERAL;
final static String HEADLINE_SELECT = Story.TYPE + " = " + StoryType.HEADLINE;

@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
	String select = null;
	String[] projection = null;
	switch (id) {
		case STORY_LIST:
			projection = STORY_PROJECTION;
			select = STORY_SELECT;
			break;
		case HEADLINE_LIST:
			projection = HEADLINE_PROJECTION;
			select = HEADLINE_SELECT;
			break;
	}

	return new CursorLoader(getActivity(), Story.CONTENT_URI, projection, select, 
			null, Story.DEFAULT_SORT);
}

@Override
public void onLoadFinished(Loader loader, Cursor data) {
	switch(loader.getId()) {
		case STORY_LIST:
			mAdapter.swapCursor(data);
			break;
		case HEADLINE_LIST:
			mHeadlineAdapter.swapCursor(data);
			break;
	}
}

@Override
public void onLoaderReset(Loader loader) {
	switch (loader.getId()) {
		case STORY_LIST:
			mAdapter.swapCursor(null);
			break;
		case HEADLINE_LIST:
			mHeadlineAdapter.swapCursor(null);
			break;
	}
}

// Return false if we're scrolling in the x direction
class PagerScrollDetector extends SimpleOnGestureListener {
	@Override
	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
		return true;
	}
}

class AutoScrollTimerTask extends TimerTask {
	@Override
	public void run() {
		getActivity().runOnUiThread(new Runnable() {
			@Override
			public void run() {
				if (mHeadlinePager != null) {
					int count = mHeadlineAdapter.getCount();

					if (count > 0) {
						int current = mHeadlinePager.getCurrentItem();
						mHeadlinePager.setCurrentItem((current + 1) % count, true);
					}
				}
			}
		});
	}
}

gistfile1.txt

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