Android: how to check if a View inside of ScrollView is visible?

This works:

Rect scrollBounds = new Rect(); scrollView.getHitRect(scrollBounds); if (imageView.getLocalVisibleRect(scrollBounds)) {     // Any portion of the imageView, even a single pixel, is within the visible window } else {     // NONE of the imageView is within the visible window } 

Use View#getHitRect instead of View#getDrawingRect on the view you're testing. You can use View#getDrawingRect on the ScrollView instead of calculating explicitly.

Code from View#getDrawingRect:

 public void getDrawingRect(Rect outRect) {         outRect.left = mScrollX;         outRect.top = mScrollY;         outRect.right = mScrollX + (mRight - mLeft);         outRect.bottom = mScrollY + (mBottom - mTop);  } 

Code from View#getHitRect:

public void getHitRect(Rect outRect) {         outRect.set(mLeft, mTop, mRight, mBottom); } 

If you want to detect that the view is FULLY visible:

private boolean isViewVisible(View view) {     Rect scrollBounds = new Rect();     mScrollView.getDrawingRect(scrollBounds);      float top = view.getY();     float bottom = top + view.getHeight();      if (scrollBounds.top < top && scrollBounds.bottom > bottom) {         return true;     } else {         return false;     } } 

This extension help detect view fully visible.
It also work if your View is a child of child of ... of ScrollView (eg: ScrollView -> LinearLayout -> ContraintLayout -> ... -> YourView).

fun ScrollView.isViewVisible(view: View): Boolean {     val scrollBounds = Rect()     this.getDrawingRect(scrollBounds)     var top = 0f     var temp = view     while (temp !is ScrollView){         top += (temp).y         temp = temp.parent as View     }     val bottom = top + view.height     return scrollBounds.top < top && scrollBounds.bottom > bottom } 

Note

1) view.getY() and view.getX() return the x,y value to FIRST PARENT.

2) Here is example about how getDrawingRect will return Link

My Solution is use NestedScrollView Scroll element:

    final Rect scrollBounds = new Rect();     scroller.getHitRect(scrollBounds);      scroller.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {         @Override         public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {              if (myBtn1 != null) {                  if (myBtn1.getLocalVisibleRect(scrollBounds)) {                     if (!myBtn1.getLocalVisibleRect(scrollBounds)                             || scrollBounds.height() < myBtn1.getHeight()) {                         Log.i(TAG, "BTN APPEAR PARCIALY");                     } else {                         Log.i(TAG, "BTN APPEAR FULLY!!!");                     }                 } else {                     Log.i(TAG, "No");                 }             }          }     }); }