Develop Reference

Viewpager inside Viewpager Scroll Issue

in my main activity i have a horizontal viewpager. Inside one of the fragment of the viewpager i have another vertical viewpager. Both works fine. But for the horizontal viewpager, i need to scroll from the edge of the screens. But i want it to be scrolled from anywhere in the screen.
my horizontal viewpager setup:
viewPager = (ViewPager) findViewById(R.id.viewpager);
adapterViewPager = new HorizontalViewPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapterViewPager);
viewPager.setCurrentItem(1);
horizontal viewpager adapter:
public class HorizontalViewPagerAdapter extends FragmentPagerAdapter {
private static int NUM_ITEMS = 3;
public HorizontalViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return MoreFragment.newInstance("Fragment MoreFragment", "HA HA HA");
case 1:
return NewsFragment.newInstance("Fragment 1", "HA HA HA");
case 2:
return WebViewFragment.newInstance("Fragment Webview", "HA HA HA");
default:
return null;
}
}
#Override
public int getCount() {
return NUM_ITEMS;
}
#Override
public CharSequence getPageTitle(int position) {
return "Tab " + position;
}
}
in my news fragment i have another viewpager.
viewPager = view.findViewById(R.id.shortpager);
adapterViewPager = new VerticalPagerAdapter(getActivity().getSupportFragmentManager(), newsList);
viewPager.setAdapter(adapterViewPager);
My vertical viewpager class:
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
super(context);
init();
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
// The majority of the magic happens here
setPageTransformer(true, new VerticalPageTransformer());
// The easiest way to get rid of the overscroll drawing that happens on the left and right
setOverScrollMode(OVER_SCROLL_NEVER);
}
/**
* Swaps the X and Y coordinates of your touch event.
*/
private MotionEvent swapXY(MotionEvent ev) {
float width = getWidth();
float height = getHeight();
float newX = (ev.getY() / height) * width;
float newY = (ev.getX() / width) * height;
ev.setLocation(newX, newY);
return ev;
}
#Override
public boolean onInterceptTouchEvent(MotionEvent ev){
boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
swapXY(ev); // return touch coordinates to original reference frame for any child views
return intercepted;
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
return super.onTouchEvent(swapXY(ev));
}
private class VerticalPageTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.75f;
#Override
public void transformPage(View view, float position) {
if (position <= -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 0) { // [-1,0]
// Use the default slide transition when moving to the left/top page
view.setAlpha(1);
ViewCompat.setElevation(view, 1);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
view.setTranslationY(0);
//set Y position to swipe in from top
float scaleFactor = MIN_SCALE + (1 - MIN_SCALE) * (1 - Math.abs(position));
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
} else if (position <= 1) { // [0,1]
view.setAlpha(1);
ViewCompat.setElevation(view, 2);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
view.setTranslationY(position * view.getHeight());
// Scale the page down (between MIN_SCALE and 1)
view.setScaleX(1);
view.setScaleY(1);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
}
vertical viewpager adapter:
public class VerticalPagerAdapter extends FragmentPagerAdapter {
private static int NUM_ITEMS = 3;
private final ArrayList<News> newsList;
public VerticalPagerAdapter(FragmentManager fm, ArrayList<News> newsList) {
super(fm);
this.newsList = newsList;
}
#Override
public Fragment getItem(int position) {
return ShortFragment.newInstance("Fragment 1", "HA HA HA", newsList.get(position));
}
#Override
public int getCount() {
return this.newsList.size();
}
#Override
public CharSequence getPageTitle(int position) {
return "Tab " + position;
}
}
Vertical viewpager scrolls smoothly. Currently for horizontal viewpager, i have to scroll from the edge of the screens. But i need to make it scrolled like the vertical one from anywhere in the screen.

Issue with your code is your VerticalViewPager
If you notice the code,
#Override
public boolean onInterceptTouchEvent(MotionEvent ev){
boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
swapXY(ev); // return touch coordinates to original reference frame for any child views
return intercepted;
}
Step-1, Call super with swapped gesture.
Step-2, Perform actions on vertical view pager with current gesture.
And if you specifically see the comment, // return touch coordinates to original reference frame for any child views this clearly tells that gesture is first consumed by child.
So in your vertical view pager since you are swapping the gestures, it is consuming the Horizontal Gesture even before passing it to the parent. Thats why your horizontal view pager do not get the gesture.
If you are using Vertical View Pager with any conflicting gesture implementation like ScrollView, Lists, RecyclerView, ViewPager, etc. use the one as in the link below. It is deprecated but works with all Gesture Conflicting Views.
https://github.com/kaelaela/VerticalViewPager

I had this issue and I resolved it by wrapping the viewpager in a Scrollview
<ScrollView
android:id="#+id/nested_scroll"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.viewpager2.widget.ViewPager2
android:id="#+id/view_pager"
android:nestedScrollingEnabled="false"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</ScrollView>

Scroll List View one item at time

Hello guys i would like to make my Listview like this, One item scroll at a time and smooth .
here what i've tried so far but no luck :(
Please help and thanks in advance
Custom ListView Class
public class SingleScrollListView extends ListView {
private boolean mSingleScroll = false;
private VelocityTracker mVelocity = null;
final private float mEscapeVelocity = 2000.0f;
final private int mMinDistanceMoved = 20;
private float mStartY = 0;
public SingleScrollListView(Context context) {
super(context);
}
public SingleScrollListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SingleScrollListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void setSingleScroll(boolean aSingleScroll) {
mSingleScroll = aSingleScroll;
}
public int getVerticalScrollOffset() {
return getFirstVisiblePosition();
}
#Override
public boolean dispatchTouchEvent(MotionEvent aMotionEvent) {
if (aMotionEvent.getAction() == MotionEvent.ACTION_DOWN) {
if (mSingleScroll && mVelocity == null)
mVelocity = VelocityTracker.obtain();
mStartY = aMotionEvent.getY();
return super.dispatchTouchEvent(aMotionEvent);
}
if (aMotionEvent.getAction() == MotionEvent.ACTION_UP) {
if (mVelocity != null) {
if (Math.abs(aMotionEvent.getY() - mStartY) > mMinDistanceMoved) {
mVelocity.computeCurrentVelocity(1000);
float velocity = mVelocity.getYVelocity();
if (aMotionEvent.getY() > mStartY) {
// always lock
if (velocity > mEscapeVelocity) {
smoothScrollToPosition(getFirstVisiblePosition());
} else {
// lock if over half way there
View view = getChildAt(0);
if (view != null) {
if (view.getBottom() >= getHeight() / 2)
smoothScrollToPosition(getFirstVisiblePosition());
else
smoothScrollToPosition(getFirstVisiblePosition() + 1);
}
}
} else {
if (velocity < -mEscapeVelocity)
smoothScrollToPosition(getFirstVisiblePosition() + 1);
else {
// lock if over half way there
View view = getChildAt(1);
if (view != null) {
if (view.getTop() <= getHeight() / 2)
smoothScrollToPosition(getFirstVisiblePosition() + 1);
else
smoothScrollToPosition(getFirstVisiblePosition());
}
}
}
}
mVelocity.recycle();
}
mVelocity = null;
if (mSingleScroll) {
if (Math.abs(aMotionEvent.getY() - mStartY) > mMinDistanceMoved)
return super.dispatchTouchEvent(aMotionEvent);
} else
return super.dispatchTouchEvent(aMotionEvent);
}
if (mSingleScroll) {
if (mVelocity == null) {
mVelocity = VelocityTracker.obtain();
mStartY = aMotionEvent.getY();
}
mVelocity.addMovement(aMotionEvent);
}
return super.dispatchTouchEvent(aMotionEvent);
}
}
Custom Adapter
private class CarListAdapter extends ArrayAdapter<CarList> {
public CarListAdapter() {
super(MainActivity.this, R.layout.list_view_layout, listArray);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View itemView = convertView;
if (itemView == null) {
itemView = getLayoutInflater().inflate(R.layout.list_view_layout, parent, false);
}
CarList data = listArray.get(position);
ImageView Image = (ImageView) itemView.findViewById(R.id.image_holder);
Image.setImageResource(data.getImageID());
return itemView;
}
}
List View Layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/image_holder"
android:layout_width="match_parent"
android:layout_height="400dp"
android:scaleType="centerCrop"
android:src="#drawable/car_1" />

I liked the UI of your app. For the Answer part I suggest you to use viewpager instead of ListView .
Which come to first real question how to make viewPager scroll vertical ?
Answer is :- override touch events and use use viewpager transformer to give illusion of vertical pager as described in this Answer.
I am just copying snippet here
/**
* Uses a combination of a PageTransformer and swapping X & Y coordinates
* of touch events to create the illusion of a vertically scrolling ViewPager.
*
* Requires API 11+
*
*/
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
super(context);
init();
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
// The majority of the magic happens here
setPageTransformer(true, new VerticalPageTransformer());
// The easiest way to get rid of the overscroll drawing that happens on the left and right
setOverScrollMode(OVER_SCROLL_NEVER);
}
private class VerticalPageTransformer implements ViewPager.PageTransformer {
#Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) { // [-1,1]
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
//set Y position to swipe in from top
float yPosition = position * view.getHeight();
view.setTranslationY(yPosition);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
/**
* Swaps the X and Y coordinates of your touch event.
*/
private MotionEvent swapXY(MotionEvent ev) {
float width = getWidth();
float height = getHeight();
float newX = (ev.getY() / height) * width;
float newY = (ev.getX() / width) * height;
ev.setLocation(newX, newY);
return ev;
}
#Override
public boolean onInterceptTouchEvent(MotionEvent ev){
boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
swapXY(ev); // return touch coordinates to original reference frame for any child views
return intercepted;
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
return super.onTouchEvent(swapXY(ev));
}
}
and it look like this
Now for second part of how to make textView used for cost is go up along with page swipe
You can use vertical view pager with textSwitcher
costNameSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
#Override
public android.view.View makeView() {
LayoutInflater inflater = LayoutInflater.from(getActivity());
TextView textView = (TextView) inflater.inflate(R.layout.offer_heading, null);
return textView;
}
});
costNameSwitcher.setInAnimation(getActivity(), R.anim.slide_in_up);
costNameSwitcher.setOutAnimation(getActivity(), R.anim.slide_out_up);
And on page switch change text in textswitcher like this
verticalViewPager
.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position,
float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
costNameSwitcher.setText("Some Cost");
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
Animations
slide_in_up
<?xml version="1.0" encoding="UTF-8"?>
<translate android:toYDelta="0%p" android:fromYDelta="100%p" android:duration="500" xmlns:android="http://schemas.android.com/apk/res/android"/>
slide_out_up
<?xml version="1.0" encoding="UTF-8"?>
<translate android:toYDelta="-100%p" android:fromYDelta="0%p" android:duration="500" xmlns:android="http://schemas.android.com/apk/res/android"/>
ViewPager with views
/**
* The Class slidingPagerAdapter.
*/
public class slidingPagerAdapter extends PagerAdapter {
private final List<HotOffer> listOfOffers;
private Context mContext;
private LayoutInflater mLayoutInflater;
/**
* Instantiates a new home slides pager adapter.
*
* #param context the context
* #param carousalImage
*/
public slidingPagerAdapter(Context context, List<HotOffer> carousalImage) {
mContext = context;
mLayoutInflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.listOfOffers = carousalImage;
}
#Override
public int getCount() {
return listOfOffers.size();
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == ((FrameLayout) object);
}
#Override
public Object instantiateItem(ViewGroup container, final int position) {
final View itemView = mLayoutInflater.inflate(R.layout.carousal_page, container,
false);
Picasso.with(mContext)
.load(listOfOffers.get(position).getImageUrl())
.networkPolicy(NetworkPolicy.OFFLINE)
.fit()
.centerCrop()
.into((ImageView) itemView
.findViewById(R.id.image), new Callback() {
#Override
public void onSuccess() {
}
#Override
public void onError() {
// Try again online if cache failed
Picasso.with(mContext)
.load(listOfOffers.get(position).getImageUrl())
.fit()
.centerCrop()
.into((ImageView) itemView
.findViewById(R.id.image));
}
});
container.addView(itemView);
return itemView;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((FrameLayout) object);
}
}
Showing little bit of next/previous view
// Disable clip to padding
viewPager.setClipToPadding(false);
// set padding manually, the more you set the padding the more you see of prev & next page
viewPager.setPadding(40, 0, 40, 0);
Result :-
You dont need to set left padding ie use
viewPager.setPadding(40, 0, 0, 0);

Why dont you use vertical scrollable viewpager with fragments for this purpose.
I am copying this answer here for your reference.
You can use a ViewPager.PageTransformer to give the illusion of a vertical ViewPager. To achieve scrolling with a vertical instead of a horizontal drag you will have to override ViewPager's default touch events and swap the coordinates of MotionEvents prior to handling them, e.g.:
/**
* Uses a combination of a PageTransformer and swapping X & Y coordinates
* of touch events to create the illusion of a vertically scrolling ViewPager.
*
* Requires API 11+
*
*/
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
super(context);
init();
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
// The majority of the magic happens here
setPageTransformer(true, new VerticalPageTransformer());
// The easiest way to get rid of the overscroll drawing that happens on the left and right
setOverScrollMode(OVER_SCROLL_NEVER);
}
private class VerticalPageTransformer implements ViewPager.PageTransformer {
#Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) { // [-1,1]
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
//set Y position to swipe in from top
float yPosition = position * view.getHeight();
view.setTranslationY(yPosition);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
/**
* Swaps the X and Y coordinates of your touch event.
*/
private MotionEvent swapXY(MotionEvent ev) {
float width = getWidth();
float height = getHeight();
float newX = (ev.getY() / height) * width;
float newY = (ev.getX() / width) * height;
ev.setLocation(newX, newY);
return ev;
}
#Override
public boolean onInterceptTouchEvent(MotionEvent ev){
boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
swapXY(ev); // return touch coordinates to original reference frame for any child views
return intercepted;
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
return super.onTouchEvent(swapXY(ev));
}
}
Of course you can tweak these settings as you see fit.

Android - Change padding for viewpager side pages

I need to create the following layout to my viewpager:
I'm using PageContainer:
public class PagerContainer extends FrameLayout implements ViewPager.OnPageChangeListener{
private ViewPager mPager;
boolean mNeedsRedraw = false;
public PagerContainer(Context context)
{
super(context);
init();
}
public PagerContainer(Context context, AttributeSet attrs)
{
super(context, attrs);
init();
}
public PagerContainer(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
init();
}
private void init()
{
// Disable clipping of children so non-selected pages are visible
setClipChildren(false);
// Child clipping doesn't work with hardware acceleration in Android
// 3.x/4.x
// You need to set this value here if using hardware acceleration in an
// application targeted at these releases.
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
#Override
protected void onFinishInflate()
{
try
{
mPager = (ViewPager) getChildAt(0);
mPager.setOnPageChangeListener(this);
} catch (Exception e)
{
throw new IllegalStateException("The root child of PagerContainer must be a ViewPager");
}
}
public ViewPager getViewPager()
{
return mPager;
}
private Point mCenter = new Point();
private Point mInitialTouch = new Point();
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
mCenter.x = w / 2;
mCenter.y = h / 2;
}
#Override
public boolean onTouchEvent(MotionEvent ev)
{
// We capture any touches not already handled by the ViewPager
// to implement scrolling from a touch outside the pager bounds.
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mInitialTouch.x = (int) ev.getX();
mInitialTouch.y = (int) ev.getY();
default:
ev.offsetLocation(mCenter.x - mInitialTouch.x, mCenter.y - mInitialTouch.y);
break;
}
return mPager.dispatchTouchEvent(ev);
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels)
{
// Force the container to redraw on scrolling.
// Without this the outer pages render initially and then stay static
if (mNeedsRedraw)
invalidate();
}
#Override
public void onPageSelected(int position)
{}
#Override
public void onPageScrollStateChanged(int state)
{
mNeedsRedraw = (state != ViewPager.SCROLL_STATE_IDLE);
}
`
And seting like this:
PagerContainer mContainer = (PagerContainer) mainView.findViewById(R.id.pagerContainer);
pager = mContainer.getViewPager();
pager.setOffscreenPageLimit(pagerAdapter.getCount());
pager.setPageMargin(getPx(20));
pager.setClipChildren(false);
But the side pages has the same size of the active page.
I've tried to use pager.setPageMargin but only sets margim between pages.
Can someone help me?

you need a PageTransfomer for that the changes the scale of the page on the left and on the right of the central one. When you implement the interface you'll be forced to implement the
public void transformPage (View page, float position) {
}
page is the current ViewPager's page, while float position is the position of page relative to the current center position of the pager. What you probably want is to change the scaleX and scaleY of page, when position is grater then 1 or less then -1. E.g.
public void transformPage (View page, float position) {
if (position > 1 || position < -1) {
ViewCompat.scaleX(page, 0.75f * paget.getWidth());
ViewCompat.scaleY(page, 0.75f * paget.getHeight());
} else if (position == 0) {
ViewCompat.scaleX(page, 1f);
ViewCompat.scaleY(page, 1f);
}
}
I have not the possibility to try it out so, please check for typo/cast.

SwipeRefreshLayout with vertical view pager to only refresh on the topmost fragment

I've tried to implement swiperefreshlayout in my code but it keeps refreshing the entire pager instead of just refreshing when i'm on the first Fragment i.e the 0th Fragment.
I tried setting refresh to false as shown, but the loader still appears, and doesn't reset when I go back to the 0th Fragment again.
On setting swiperefreshlayout.enable(false), I can't refresh it anywhere.
Can anyone suggest an alternative?
This is my XML file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/parentLinearLayout"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipe_refresh_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<lbbdapp.littleblackbook.com.littleblackbook.Support.VerticalViewPager
android:id="#+id/verticalViewPager"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</ScrollView>
</android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>
And this is my activity:
public class FeedActivity extends ActionBarActivity {
PageAdapter mPageAdapter;
ProgressBar mProgressBar;
ProgressDialog prog;
ViewPager pager;
String article_id;
private float x1, x2;
SwipeRefreshLayout mSwipeRefreshLayout;
ArrayList<FragmentObject> mObjectsDataList;
ArrayList<ArticleObject> mArticleDataList=new ArrayList<ArticleObject>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.feed_layout);
mObjectsDataList = new ArrayList<FragmentObject>();
DataFetcherTask myTask = new DataFetcherTask();
myTask.execute();
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
mSwipeRefreshLayout.setColorScheme(android.R.color.holo_blue_bright,
android.R.color.holo_blue_dark,
android.R.color.holo_purple,
android.R.color.darker_gray);
pager=(ViewPager)findViewById(R.id.verticalViewPager);
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
if(pager.getCurrentItem()==0) {
Log.wtf("current item is 0", "0");
mSwipeRefreshLayout.setRefreshing(true);
Log.wtf("Swiping", "Refreshing");
(new Handler()).postDelayed(new Runnable() {
#Override
public void run() {
mSwipeRefreshLayout.setRefreshing(false);
DataFetcherTask myTask = new DataFetcherTask();
myTask.execute();
}
}, 3000);
}
else{
mSwipeRefreshLayout.setRefreshing(false);
}
}
});
}
This is my vertical ViewPager:
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
super(context);
init();
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
// The majority of the magic happens here
setPageTransformer(true, new VerticalPageTransformer());
// The easiest way to get rid of the overscroll drawing that happens on the left and right
setOverScrollMode(OVER_SCROLL_NEVER);
}
private class VerticalPageTransformer implements ViewPager.PageTransformer {
#Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) { // [-1,1]
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
//set Y position to swipe in from top
float yPosition = position * view.getHeight();
view.setTranslationY(yPosition);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
/**
* Swaps the X and Y coordinates of your touch event.
*/
private MotionEvent swapXY(MotionEvent ev) {
float width = getWidth();
float height = getHeight();
float newX = (ev.getY() / height) * width;
float newY = (ev.getX() / width) * height;
ev.setLocation(newX, newY);
return ev;
}
#Override
public boolean onInterceptTouchEvent(MotionEvent ev){
boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
swapXY(ev); // return touch coordinates to original reference frame for any child views
return intercepted;
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
return super.onTouchEvent(swapXY(ev));
}
}

Instead of extending SwipeRefesh over ViewGroup use it inside the each Fragment of ViewPager.
Once this is resolved now you need to check scroll down gesture of ViewPager and SwipeRefresh.
public class NEWSwipeRefresh extends SwipeRefreshLayout {
private View mTargetView;
public NEWSwipeRefresh(Context context) {
this(context, null);
}
public NEWSwipeRefresh(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setTarget(View view) {
mTargetView = view;
}
#Override
public boolean canChildScrollUp() {
if (mTargetView instanceof YOURVIEW) {
final StaggeredGridView absListView = (YOURVIEW)mTargetView;
return absListView.getChildCount() > 0
&& (absListView.getFirstVisiblePosition() > 0 || absListView
.getChildAt(0).getTop() < absListView
.getPaddingTop());
} else {
return super.canChildScrollUp();
}
}
}
Normally swipe refresh returns -1 and it gives swipe gesture to it's parent now I have overridden it here for listview/gridview so that it can check for visible items, if it is on top then it will give swipe to parent or otherwise it will give it to children.

Well, I was trying to figure this out since few days and it's quite simple. Just put the SwipeRefreshLayout as the parent element of ViewPager and just disable the SwipeRefreshLayout on the particular fragment using OnPageChangeListener as follows:
// viewpager change listener
OnPageChangeListener viewPagerPageChangeListener = new OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
//for the 0th pos disable SwipeRefreshLayout;
if(position != 0){
swipeRefreshLayout.setEnabled(false);
}else swipeRefreshLayout.setEnabled(true);
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}};

Android view Pager flip more pages on swipe

I am using ViewPager with FragmentStatePageAdapter to show a number of views where user can go through. With current implementation only one page is changed at any single swipe. Instead I want to flip through multiple views based on user swipe. If swipe is long/fast i need to flip through multiple views and vice versa.
here is my current code
public class MyAdapter extends FragmentStatePagerAdapter
{
public MyAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
#Override
public int getCount() {
return 10;
}
#Override
public Fragment getItem(int position) {
return ItemFragment.init(position);
}
}
PageContainer class
public class PagerContainer extends FrameLayout implements ViewPager.OnPageChangeListener {
private ViewPager mPager;
boolean mNeedsRedraw = false;
public PagerContainer(Context context) {
super(context);
init();
}
public PagerContainer(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public PagerContainer(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
//Disable clipping of children so non-selected pages are visible
setClipChildren(false);
//Child clipping doesn't work with hardware acceleration in Android 3.x/4.x
//You need to set this value here if using hardware acceleration in an
// application targeted at these releases.
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
#Override
protected void onFinishInflate() {
try {
mPager = (ViewPager) getChildAt(0);
mPager.setOnPageChangeListener(this);
} catch (Exception e) {
throw new IllegalStateException("The root child of PagerContainer must be a ViewPager");
}
}
public ViewPager getViewPager() {
return mPager;
}
private Point mCenter = new Point();
private Point mInitialTouch = new Point();
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mCenter.x = w / 2;
mCenter.y = h / 2;
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
//We capture any touches not already handled by the ViewPager
// to implement scrolling from a touch outside the pager bounds.
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mInitialTouch.x = (int)ev.getX();
mInitialTouch.y = (int)ev.getY();
default:
ev.offsetLocation(mCenter.x - mInitialTouch.x, mCenter.y - mInitialTouch.y);
break;
}
return mPager.dispatchTouchEvent(ev);
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
//Force the container to redraw on scrolling.
//Without this the outer pages render initially and then stay static
if (mNeedsRedraw) invalidate();
}
#Override
public void onPageSelected(int position) { }
#Override
public void onPageScrollStateChanged(int state) {
mNeedsRedraw = (state != ViewPager.SCROLL_STATE_IDLE);
}
}
How can I do this in android?
Thanks

You can change the view by calling:
ViewPager.setCurrentItem(int index)
ViewPager.setCurrentItem(int index, bool animation)
You must handle the sliding commands yourself, but on a certain slide you cloud call setCurrentItem of the ViewPager. The setCurrentItem method also allows you to enable or disable animations.