listening to scroll events horizontalscrollview android

Question

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?

Answer 1

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.

Answer 2

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;
        }

    });

Answer 3

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>

Answer 4

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 {

            }
        }
    });

Answer 5

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);
}
}

Answer 6

Based @Dipak's answer In kotlin:

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