How to scroll discretely in recylcer view with gridlayoutmanager?












0















I'm using a recyclerView with GridLayoutManager and I've set it to scroll horizontally. i want it to scroll discretely. This is how its displaying when i launch it.



Current display



and when i scroll it even a little bit it should keep scrolling until the next item is completely visible aka discretely and not stop before that . it should look like this.



like this



and it should end like this.
Not like this



How can i scroll discretely like that ? Any guidance or help would be highly appreciated!!










share|improve this question























  • what do you mean by scroll discretely?

    – Suraj Vaishnav
    Nov 23 '18 at 9:36






  • 1





    There is a technique called SnapHelper which scrolls discretely. Refere this link blog.mindorks.com/using-snaphelper-in-recyclerview-fc616b6833e8

    – Ashish Kudale
    Nov 23 '18 at 9:47











  • @AshishKudale.. Yeah got it. Thanks mate

    – Muhammad Abdullah
    Nov 24 '18 at 5:56
















0















I'm using a recyclerView with GridLayoutManager and I've set it to scroll horizontally. i want it to scroll discretely. This is how its displaying when i launch it.



Current display



and when i scroll it even a little bit it should keep scrolling until the next item is completely visible aka discretely and not stop before that . it should look like this.



like this



and it should end like this.
Not like this



How can i scroll discretely like that ? Any guidance or help would be highly appreciated!!










share|improve this question























  • what do you mean by scroll discretely?

    – Suraj Vaishnav
    Nov 23 '18 at 9:36






  • 1





    There is a technique called SnapHelper which scrolls discretely. Refere this link blog.mindorks.com/using-snaphelper-in-recyclerview-fc616b6833e8

    – Ashish Kudale
    Nov 23 '18 at 9:47











  • @AshishKudale.. Yeah got it. Thanks mate

    – Muhammad Abdullah
    Nov 24 '18 at 5:56














0












0








0








I'm using a recyclerView with GridLayoutManager and I've set it to scroll horizontally. i want it to scroll discretely. This is how its displaying when i launch it.



Current display



and when i scroll it even a little bit it should keep scrolling until the next item is completely visible aka discretely and not stop before that . it should look like this.



like this



and it should end like this.
Not like this



How can i scroll discretely like that ? Any guidance or help would be highly appreciated!!










share|improve this question














I'm using a recyclerView with GridLayoutManager and I've set it to scroll horizontally. i want it to scroll discretely. This is how its displaying when i launch it.



Current display



and when i scroll it even a little bit it should keep scrolling until the next item is completely visible aka discretely and not stop before that . it should look like this.



like this



and it should end like this.
Not like this



How can i scroll discretely like that ? Any guidance or help would be highly appreciated!!







android user-interface horizontal-scrolling






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 23 '18 at 9:17









Muhammad AbdullahMuhammad Abdullah

308




308













  • what do you mean by scroll discretely?

    – Suraj Vaishnav
    Nov 23 '18 at 9:36






  • 1





    There is a technique called SnapHelper which scrolls discretely. Refere this link blog.mindorks.com/using-snaphelper-in-recyclerview-fc616b6833e8

    – Ashish Kudale
    Nov 23 '18 at 9:47











  • @AshishKudale.. Yeah got it. Thanks mate

    – Muhammad Abdullah
    Nov 24 '18 at 5:56



















  • what do you mean by scroll discretely?

    – Suraj Vaishnav
    Nov 23 '18 at 9:36






  • 1





    There is a technique called SnapHelper which scrolls discretely. Refere this link blog.mindorks.com/using-snaphelper-in-recyclerview-fc616b6833e8

    – Ashish Kudale
    Nov 23 '18 at 9:47











  • @AshishKudale.. Yeah got it. Thanks mate

    – Muhammad Abdullah
    Nov 24 '18 at 5:56

















what do you mean by scroll discretely?

– Suraj Vaishnav
Nov 23 '18 at 9:36





what do you mean by scroll discretely?

– Suraj Vaishnav
Nov 23 '18 at 9:36




1




1





There is a technique called SnapHelper which scrolls discretely. Refere this link blog.mindorks.com/using-snaphelper-in-recyclerview-fc616b6833e8

– Ashish Kudale
Nov 23 '18 at 9:47





There is a technique called SnapHelper which scrolls discretely. Refere this link blog.mindorks.com/using-snaphelper-in-recyclerview-fc616b6833e8

– Ashish Kudale
Nov 23 '18 at 9:47













@AshishKudale.. Yeah got it. Thanks mate

– Muhammad Abdullah
Nov 24 '18 at 5:56





@AshishKudale.. Yeah got it. Thanks mate

– Muhammad Abdullah
Nov 24 '18 at 5:56












1 Answer
1






active

oldest

votes


















0














I have used SnapHelper in my project, just make a class in your util package and do like this.



public class MySnapHelper extends LinearSnapHelper {

private OrientationHelper verticalHelper, horizontalHelper;

public MySnapHelper() {

}

@Override
public void attachToRecyclerView(@Nullable RecyclerView recyclerView)
throws IllegalStateException {
super.attachToRecyclerView(recyclerView);
}

@Override
public int calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager,
@NonNull View targetView) {
int out = new int[2];

if (layoutManager.canScrollHorizontally()) {
out[0] = distanceToStart(targetView, getHorizontalHelper(layoutManager));
} else {
out[0] = 0;
}

if (layoutManager.canScrollVertically()) {
out[1] = distanceToStart(targetView, getVerticalHelper(layoutManager));
} else {
out[1] = 0;
}
return out;
}

@Override
public View findSnapView(RecyclerView.LayoutManager layoutManager) {

if (layoutManager instanceof LinearLayoutManager) {

if (layoutManager.canScrollHorizontally()) {
return getStartView(layoutManager, getHorizontalHelper(layoutManager));
} else {
return getStartView(layoutManager, getVerticalHelper(layoutManager));
}
}

return super.findSnapView(layoutManager);
}

private int distanceToStart(View targetView, OrientationHelper helper) {
return helper.getDecoratedStart(targetView) - helper.getStartAfterPadding();
}

private View getStartView(RecyclerView.LayoutManager layoutManager,
OrientationHelper helper) {

if (layoutManager instanceof LinearLayoutManager) {
int firstChild = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();

boolean isLastItem = ((LinearLayoutManager) layoutManager)
.findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1;

if (firstChild == RecyclerView.NO_POSITION || isLastItem) {
return null;
}

View child = layoutManager.findViewByPosition(firstChild);

if (helper.getDecoratedEnd(child) >= helper.getDecoratedMeasurement(child) / 2
&& helper.getDecoratedEnd(child) > 0) {
return child;
} else {
if (((LinearLayoutManager) layoutManager).findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1) {
return null;
} else {
return layoutManager.findViewByPosition(firstChild + 1);
}
}
}

return super.findSnapView(layoutManager);
}

private OrientationHelper getVerticalHelper(RecyclerView.LayoutManager layoutManager) {
if (verticalHelper == null) {
verticalHelper = OrientationHelper.createVerticalHelper(layoutManager);
}
return verticalHelper;
}

private OrientationHelper getHorizontalHelper(RecyclerView.LayoutManager layoutManager) {
if (horizontalHelper == null) {
horizontalHelper = OrientationHelper.createHorizontalHelper(layoutManager);
}
return horizontalHelper;
}


}



and then just attach it with your recyclerview like this:



SnapHelper mySnapHelper = new MySnapHelper ();
mySnapHelper.attachToRecyclerView(mRecyclerView);





share|improve this answer
























  • Thank you so much. This was exactly what i needed. Highly Appreciated :)

    – Muhammad Abdullah
    Nov 24 '18 at 5:55











  • Please vote up if you found it helpful for you

    – Taha wakeel
    Nov 25 '18 at 10:35











  • Already done...

    – Muhammad Abdullah
    Nov 25 '18 at 21:05











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1 Answer
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0














I have used SnapHelper in my project, just make a class in your util package and do like this.



public class MySnapHelper extends LinearSnapHelper {

private OrientationHelper verticalHelper, horizontalHelper;

public MySnapHelper() {

}

@Override
public void attachToRecyclerView(@Nullable RecyclerView recyclerView)
throws IllegalStateException {
super.attachToRecyclerView(recyclerView);
}

@Override
public int calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager,
@NonNull View targetView) {
int out = new int[2];

if (layoutManager.canScrollHorizontally()) {
out[0] = distanceToStart(targetView, getHorizontalHelper(layoutManager));
} else {
out[0] = 0;
}

if (layoutManager.canScrollVertically()) {
out[1] = distanceToStart(targetView, getVerticalHelper(layoutManager));
} else {
out[1] = 0;
}
return out;
}

@Override
public View findSnapView(RecyclerView.LayoutManager layoutManager) {

if (layoutManager instanceof LinearLayoutManager) {

if (layoutManager.canScrollHorizontally()) {
return getStartView(layoutManager, getHorizontalHelper(layoutManager));
} else {
return getStartView(layoutManager, getVerticalHelper(layoutManager));
}
}

return super.findSnapView(layoutManager);
}

private int distanceToStart(View targetView, OrientationHelper helper) {
return helper.getDecoratedStart(targetView) - helper.getStartAfterPadding();
}

private View getStartView(RecyclerView.LayoutManager layoutManager,
OrientationHelper helper) {

if (layoutManager instanceof LinearLayoutManager) {
int firstChild = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();

boolean isLastItem = ((LinearLayoutManager) layoutManager)
.findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1;

if (firstChild == RecyclerView.NO_POSITION || isLastItem) {
return null;
}

View child = layoutManager.findViewByPosition(firstChild);

if (helper.getDecoratedEnd(child) >= helper.getDecoratedMeasurement(child) / 2
&& helper.getDecoratedEnd(child) > 0) {
return child;
} else {
if (((LinearLayoutManager) layoutManager).findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1) {
return null;
} else {
return layoutManager.findViewByPosition(firstChild + 1);
}
}
}

return super.findSnapView(layoutManager);
}

private OrientationHelper getVerticalHelper(RecyclerView.LayoutManager layoutManager) {
if (verticalHelper == null) {
verticalHelper = OrientationHelper.createVerticalHelper(layoutManager);
}
return verticalHelper;
}

private OrientationHelper getHorizontalHelper(RecyclerView.LayoutManager layoutManager) {
if (horizontalHelper == null) {
horizontalHelper = OrientationHelper.createHorizontalHelper(layoutManager);
}
return horizontalHelper;
}


}



and then just attach it with your recyclerview like this:



SnapHelper mySnapHelper = new MySnapHelper ();
mySnapHelper.attachToRecyclerView(mRecyclerView);





share|improve this answer
























  • Thank you so much. This was exactly what i needed. Highly Appreciated :)

    – Muhammad Abdullah
    Nov 24 '18 at 5:55











  • Please vote up if you found it helpful for you

    – Taha wakeel
    Nov 25 '18 at 10:35











  • Already done...

    – Muhammad Abdullah
    Nov 25 '18 at 21:05
















0














I have used SnapHelper in my project, just make a class in your util package and do like this.



public class MySnapHelper extends LinearSnapHelper {

private OrientationHelper verticalHelper, horizontalHelper;

public MySnapHelper() {

}

@Override
public void attachToRecyclerView(@Nullable RecyclerView recyclerView)
throws IllegalStateException {
super.attachToRecyclerView(recyclerView);
}

@Override
public int calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager,
@NonNull View targetView) {
int out = new int[2];

if (layoutManager.canScrollHorizontally()) {
out[0] = distanceToStart(targetView, getHorizontalHelper(layoutManager));
} else {
out[0] = 0;
}

if (layoutManager.canScrollVertically()) {
out[1] = distanceToStart(targetView, getVerticalHelper(layoutManager));
} else {
out[1] = 0;
}
return out;
}

@Override
public View findSnapView(RecyclerView.LayoutManager layoutManager) {

if (layoutManager instanceof LinearLayoutManager) {

if (layoutManager.canScrollHorizontally()) {
return getStartView(layoutManager, getHorizontalHelper(layoutManager));
} else {
return getStartView(layoutManager, getVerticalHelper(layoutManager));
}
}

return super.findSnapView(layoutManager);
}

private int distanceToStart(View targetView, OrientationHelper helper) {
return helper.getDecoratedStart(targetView) - helper.getStartAfterPadding();
}

private View getStartView(RecyclerView.LayoutManager layoutManager,
OrientationHelper helper) {

if (layoutManager instanceof LinearLayoutManager) {
int firstChild = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();

boolean isLastItem = ((LinearLayoutManager) layoutManager)
.findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1;

if (firstChild == RecyclerView.NO_POSITION || isLastItem) {
return null;
}

View child = layoutManager.findViewByPosition(firstChild);

if (helper.getDecoratedEnd(child) >= helper.getDecoratedMeasurement(child) / 2
&& helper.getDecoratedEnd(child) > 0) {
return child;
} else {
if (((LinearLayoutManager) layoutManager).findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1) {
return null;
} else {
return layoutManager.findViewByPosition(firstChild + 1);
}
}
}

return super.findSnapView(layoutManager);
}

private OrientationHelper getVerticalHelper(RecyclerView.LayoutManager layoutManager) {
if (verticalHelper == null) {
verticalHelper = OrientationHelper.createVerticalHelper(layoutManager);
}
return verticalHelper;
}

private OrientationHelper getHorizontalHelper(RecyclerView.LayoutManager layoutManager) {
if (horizontalHelper == null) {
horizontalHelper = OrientationHelper.createHorizontalHelper(layoutManager);
}
return horizontalHelper;
}


}



and then just attach it with your recyclerview like this:



SnapHelper mySnapHelper = new MySnapHelper ();
mySnapHelper.attachToRecyclerView(mRecyclerView);





share|improve this answer
























  • Thank you so much. This was exactly what i needed. Highly Appreciated :)

    – Muhammad Abdullah
    Nov 24 '18 at 5:55











  • Please vote up if you found it helpful for you

    – Taha wakeel
    Nov 25 '18 at 10:35











  • Already done...

    – Muhammad Abdullah
    Nov 25 '18 at 21:05














0












0








0







I have used SnapHelper in my project, just make a class in your util package and do like this.



public class MySnapHelper extends LinearSnapHelper {

private OrientationHelper verticalHelper, horizontalHelper;

public MySnapHelper() {

}

@Override
public void attachToRecyclerView(@Nullable RecyclerView recyclerView)
throws IllegalStateException {
super.attachToRecyclerView(recyclerView);
}

@Override
public int calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager,
@NonNull View targetView) {
int out = new int[2];

if (layoutManager.canScrollHorizontally()) {
out[0] = distanceToStart(targetView, getHorizontalHelper(layoutManager));
} else {
out[0] = 0;
}

if (layoutManager.canScrollVertically()) {
out[1] = distanceToStart(targetView, getVerticalHelper(layoutManager));
} else {
out[1] = 0;
}
return out;
}

@Override
public View findSnapView(RecyclerView.LayoutManager layoutManager) {

if (layoutManager instanceof LinearLayoutManager) {

if (layoutManager.canScrollHorizontally()) {
return getStartView(layoutManager, getHorizontalHelper(layoutManager));
} else {
return getStartView(layoutManager, getVerticalHelper(layoutManager));
}
}

return super.findSnapView(layoutManager);
}

private int distanceToStart(View targetView, OrientationHelper helper) {
return helper.getDecoratedStart(targetView) - helper.getStartAfterPadding();
}

private View getStartView(RecyclerView.LayoutManager layoutManager,
OrientationHelper helper) {

if (layoutManager instanceof LinearLayoutManager) {
int firstChild = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();

boolean isLastItem = ((LinearLayoutManager) layoutManager)
.findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1;

if (firstChild == RecyclerView.NO_POSITION || isLastItem) {
return null;
}

View child = layoutManager.findViewByPosition(firstChild);

if (helper.getDecoratedEnd(child) >= helper.getDecoratedMeasurement(child) / 2
&& helper.getDecoratedEnd(child) > 0) {
return child;
} else {
if (((LinearLayoutManager) layoutManager).findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1) {
return null;
} else {
return layoutManager.findViewByPosition(firstChild + 1);
}
}
}

return super.findSnapView(layoutManager);
}

private OrientationHelper getVerticalHelper(RecyclerView.LayoutManager layoutManager) {
if (verticalHelper == null) {
verticalHelper = OrientationHelper.createVerticalHelper(layoutManager);
}
return verticalHelper;
}

private OrientationHelper getHorizontalHelper(RecyclerView.LayoutManager layoutManager) {
if (horizontalHelper == null) {
horizontalHelper = OrientationHelper.createHorizontalHelper(layoutManager);
}
return horizontalHelper;
}


}



and then just attach it with your recyclerview like this:



SnapHelper mySnapHelper = new MySnapHelper ();
mySnapHelper.attachToRecyclerView(mRecyclerView);





share|improve this answer













I have used SnapHelper in my project, just make a class in your util package and do like this.



public class MySnapHelper extends LinearSnapHelper {

private OrientationHelper verticalHelper, horizontalHelper;

public MySnapHelper() {

}

@Override
public void attachToRecyclerView(@Nullable RecyclerView recyclerView)
throws IllegalStateException {
super.attachToRecyclerView(recyclerView);
}

@Override
public int calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager,
@NonNull View targetView) {
int out = new int[2];

if (layoutManager.canScrollHorizontally()) {
out[0] = distanceToStart(targetView, getHorizontalHelper(layoutManager));
} else {
out[0] = 0;
}

if (layoutManager.canScrollVertically()) {
out[1] = distanceToStart(targetView, getVerticalHelper(layoutManager));
} else {
out[1] = 0;
}
return out;
}

@Override
public View findSnapView(RecyclerView.LayoutManager layoutManager) {

if (layoutManager instanceof LinearLayoutManager) {

if (layoutManager.canScrollHorizontally()) {
return getStartView(layoutManager, getHorizontalHelper(layoutManager));
} else {
return getStartView(layoutManager, getVerticalHelper(layoutManager));
}
}

return super.findSnapView(layoutManager);
}

private int distanceToStart(View targetView, OrientationHelper helper) {
return helper.getDecoratedStart(targetView) - helper.getStartAfterPadding();
}

private View getStartView(RecyclerView.LayoutManager layoutManager,
OrientationHelper helper) {

if (layoutManager instanceof LinearLayoutManager) {
int firstChild = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();

boolean isLastItem = ((LinearLayoutManager) layoutManager)
.findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1;

if (firstChild == RecyclerView.NO_POSITION || isLastItem) {
return null;
}

View child = layoutManager.findViewByPosition(firstChild);

if (helper.getDecoratedEnd(child) >= helper.getDecoratedMeasurement(child) / 2
&& helper.getDecoratedEnd(child) > 0) {
return child;
} else {
if (((LinearLayoutManager) layoutManager).findLastCompletelyVisibleItemPosition()
== layoutManager.getItemCount() - 1) {
return null;
} else {
return layoutManager.findViewByPosition(firstChild + 1);
}
}
}

return super.findSnapView(layoutManager);
}

private OrientationHelper getVerticalHelper(RecyclerView.LayoutManager layoutManager) {
if (verticalHelper == null) {
verticalHelper = OrientationHelper.createVerticalHelper(layoutManager);
}
return verticalHelper;
}

private OrientationHelper getHorizontalHelper(RecyclerView.LayoutManager layoutManager) {
if (horizontalHelper == null) {
horizontalHelper = OrientationHelper.createHorizontalHelper(layoutManager);
}
return horizontalHelper;
}


}



and then just attach it with your recyclerview like this:



SnapHelper mySnapHelper = new MySnapHelper ();
mySnapHelper.attachToRecyclerView(mRecyclerView);






share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 23 '18 at 10:12









Taha wakeelTaha wakeel

896




896













  • Thank you so much. This was exactly what i needed. Highly Appreciated :)

    – Muhammad Abdullah
    Nov 24 '18 at 5:55











  • Please vote up if you found it helpful for you

    – Taha wakeel
    Nov 25 '18 at 10:35











  • Already done...

    – Muhammad Abdullah
    Nov 25 '18 at 21:05



















  • Thank you so much. This was exactly what i needed. Highly Appreciated :)

    – Muhammad Abdullah
    Nov 24 '18 at 5:55











  • Please vote up if you found it helpful for you

    – Taha wakeel
    Nov 25 '18 at 10:35











  • Already done...

    – Muhammad Abdullah
    Nov 25 '18 at 21:05

















Thank you so much. This was exactly what i needed. Highly Appreciated :)

– Muhammad Abdullah
Nov 24 '18 at 5:55





Thank you so much. This was exactly what i needed. Highly Appreciated :)

– Muhammad Abdullah
Nov 24 '18 at 5:55













Please vote up if you found it helpful for you

– Taha wakeel
Nov 25 '18 at 10:35





Please vote up if you found it helpful for you

– Taha wakeel
Nov 25 '18 at 10:35













Already done...

– Muhammad Abdullah
Nov 25 '18 at 21:05





Already done...

– Muhammad Abdullah
Nov 25 '18 at 21:05


















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