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I am trying to listen to the event when the HorizontalScrollView is scrolled. Tried this but it does not print anything.

HorizontalScrollView headerScrollView = new HorizontalScrollView(this); headerScrollView.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub Log.i("hv1",event.toString()); Log.i("hv1","HELLO"); return false; } });

The actual problem is, I want to scroll two HorizontalScrollView at a time..ie; both of them need to scroll simultaneously when atleast one of them scrolled. any workaround?

I used the answer below and then tried implementing this but I am not sure how I need to use the methods in the class.

TestHorizontalScrollView headerScrollView = (TestHorizontalScrollView) findViewById(R.id.headerHv);

Is this the way I need to point to the hsv element in the layout file?

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6 Answers 6

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28

You may want to try creating your own custom class that extends HorizontalScrollView and overriding the onScrollChanged() function as such

public class TestHorizontalScrollView extends HorizontalScrollView { public TestHorizontalScrollView(Context context) { super(context); } @Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { // TODO Auto-generated method stub Log.i("Scrolling", "X from ["+oldl+"] to ["+l+"]"); super.onScrollChanged(l, t, oldl, oldt); } }

This overriden function will catch all changes to the scroll position even when the view is not being touched. This should keep your scroll views in sync.

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8 Comments

thanks for that. Well, i have two listviews which i have wrapped with a horizontal scroll view individually. My requirement is, when either one of the list is scrolled, the also has to scroll at the same time. Please share if you have any ideas regarding the same. Thanks.
So would this be something like the default news and weather app on Android? You can scroll left / right between ListViews, except with two ListViews in view? I'm wondering if you can just combine the two ListViews into one, and separating the two sides with LinearLayouts. Trying to visualize it :)
hmm..i think you dint get it right..let me explain again with a better example, I need to design a table kinda thing which looks very similar to excel spreadsheet..the column headings are stored in one list and the content below is stored in one list(this will have several rows)...when the list(content) below is scrolled, the header should also scroll along with that..i need to have two seperate lists (header and content) as this kinda table would be a generic table and would be built during runtime with different headers and content...
Also, i tried this, but it does not work..something seems to be wrong for sure..kindly guide TestHorizontalScrollView headerScrollView = (TestHorizontalScrollView) findViewById(R.id.headerHv); please guide me as to how I use this class
I believe I had done what was provided above before. I will have to check later tonight. I can edit my post once I verify the solution. :)
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8

old question, but maybe helpful. You can do something like this:

scrollOne = (HorizontalScrollView)findViewById(R.id.horizontal_one); scrollTwo = (HorizontalScrollView)findViewById(R.id.horizontal_two); scrollTwo.setOnTouchListener(new OnTouchListener(){ @Override public boolean onTouch(View view, MotionEvent event) { // TODO Auto-generated method stub int scrollX = view.getScrollX(); int scrollY = view.getScrollY(); scrollOne.scrollTo(scrollX, scrollY); return false; } });
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7 Comments

Hey thank you for your answer. But when I am moving HorizontalScrollView again back to its original position, then first one is not moving with it...What am I missing?
I Think the problem is, that You havent set both scroll views to the listener. Do this example above with both horizontal scroll views, the scrollOne in this example needs also an onTouchListener and inside, move scrollTwo.
I am not getting your answer..I have updated my code here...can you tell me what am I missing
And, surely what I forgot, If You scroll any scrollView programmatically, You have to do this code where You scroll it. This above example only works in onTouch
hs2.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub int scrollX = v.getScrollX(); int curX = scrollX; hs1.scrollBy(scrollX, 0); return false; } });
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ScrollView with Listener, api < 23

write below in your code

MyHorizontalScrollView scrollView = (MyHorizontalScrollView)view.findViewById(R.id.scrollViewBrowse); scrollView.setOnScrollChangedListener(new MyHorizontalScrollView.OnScrollChangedListener() { @Override public void onScrollChanged(int l, int t, int oldl, int oldt) { } });

MyHorizontalScrollView

 public class MyHorizontalScrollView extends ScrollView { public OnScrollChangedListener mOnScrollChangedListener; public MyHorizontalScrollView(Context context) { super(context); } public MyHorizontalScrollView(Context context, AttributeSet attrs) { super(context, attrs); } public MyHorizontalScrollView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { super.onScrollChanged(l, t, oldl, oldt); if (mOnScrollChangedListener != null) { mOnScrollChangedListener.onScrollChanged(l, t, oldl, oldt); } } public void setOnScrollChangedListener(OnScrollChangedListener onScrollChangedListener){ this.mOnScrollChangedListener = onScrollChangedListener; } public interface OnScrollChangedListener{ void onScrollChanged(int l, int t, int oldl, int oldt); } }

* Xml file *

<MyHorizontalScrollView android:id="@+id/scrollViewBrowse" android:layout_width="match_parent" android:layout_height="fill_parent" android:background="@drawable/backgroung" android:padding="10dp"> </MyHorizontalScrollView>
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2

To Avoid the the Api Level Problem... follow this.

scrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() { @Override public void onScrollChanged() { int scrollY = scrollView.getScrollY(); int scrollX = scrollView.getScrollX(); if (scrollY > 500) { } else { } } });
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0

you can try this, i've tried so many ways, but none of them meet my needs, and then i tried to do it myself, and i succeed , and it seems good , it's smooth.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="match_parent" android:orientation="horizontal"> <ScrollView android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:orientation="horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content"> <com.szl.fundlistdemo.WrapContentListView android:id="@+id/left_lv" android:layout_width="100dp" android:layout_height="wrap_content" android:scrollbars="none"/> <HorizontalScrollView android:id="@+id/hscrollview" android:layout_width="wrap_content" android:layout_height="wrap_content"> <com.szl.fundlistdemo.WrapContentListView android:id="@+id/right_lv" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </HorizontalScrollView> </LinearLayout> </ScrollView> 

public class WrapContentListView extends ListView{ public WrapContentListView(Context context) { super(context); } public WrapContentListView(Context context, AttributeSet attrs) { super(context, attrs); } public WrapContentListView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, expandSpec); } }
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0

Based @Dipak's answer In kotlin:

binding.scrollList.viewTreeObserver.addOnScrollChangedListener { val X = binding.scrollList.scrollX val Y = binding.scrollList.scrollY }
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