The ScrollView does not provide a method to scroll to a specific list item - but it does provide the methods scrollTo({x, y, animated}) . If your list items are of equal height, you can use them to implement scrolling to a specific item by calling scrollTo({y:itemIndex * ROW_HEIGHT}) .
NestedScrollView is just like ScrollView , but it supports acting as both a nested scrolling parent and child on both new and old versions of Android. Nested scrolling is enabled by default.
In order to place multiple views in the scroll view, one needs to make a view group(like LinearLayout) as a direct child and then we can define many views inside it. A ScrollView supports Vertical scrolling only, so in order to create a horizontally scrollable view, HorizontalScrollView is used.
private final void focusOnView(){
your_scrollview.post(new Runnable() {
@Override
public void run() {
your_scrollview.scrollTo(0, your_EditBox.getBottom());
}
});
}
The answer of Sherif elKhatib can be greatly improved, if you want to scroll the view to the center of the scroll view. This reusable method smooth scrolls the view to the visible center of a HorizontalScrollView.
private final void focusOnView(final HorizontalScrollView scroll, final View view) {
new Handler().post(new Runnable() {
@Override
public void run() {
int vLeft = view.getLeft();
int vRight = view.getRight();
int sWidth = scroll.getWidth();
scroll.smoothScrollTo(((vLeft + vRight - sWidth) / 2), 0);
}
});
}
For a vertical ScrollView
use
...
int vTop = view.getTop();
int vBottom = view.getBottom();
int sHeight = scroll.getBottom();
scroll.smoothScrollTo(((vTop + vBottom - sHeight) / 2), 0);
...
This works well for me :
targetView.getParent().requestChildFocus(targetView,targetView);
public void RequestChildFocus (View child, View focused)
child - The child of this ViewParent that wants focus. This view will contain the focused view. It is not necessarily the view that actually has focus.
focused - The view that is a descendant of child that actually has focus
In my opinion the best way to scroll to a given rectangle is via View.requestRectangleOnScreen(Rect, Boolean)
. You should call it on a View
you want to scroll to and pass a local rectangle you want to be visible on the screen. The second parameter should be false
for smooth scrolling and true
for immediate scrolling.
final Rect rect = new Rect(0, 0, view.getWidth(), view.getHeight());
view.requestRectangleOnScreen(rect, false);
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