How to Programmatically Scroll a ScrollView to Bottom

Question

I've a problem I can't solve: inside a ScrollView I only have a LinearLayout. By a user action I'm programmatically adding 2 TextView on this LinearLayout, but by the default the scroll keeps on the top. Since I controll the user action, I should be easy to scroll to the bottom with something like:

ScrollView scroll = (ScrollView) this.findViewById(R.id.scroll); scroll.scrollTo(0, scroll.getBottom()); 

But actually not. Because immediately after adding this two new elements getBottom() still returns the previous two. I tried to refresh the state invoking refreshDrawableState(), but I doesn't work.

Do you have any idea how could I get the actual bottom of a ScrollView after adding some elements?

Answer 1

You need to use the message queue or else it won't work. Try this:

scrollView.post(new Runnable() {     @Override     public void run() {         scrollView.fullScroll(ScrollView.FOCUS_DOWN);     } }); 

This is what worked for me.

Answer 2

This doesn't actually answer your question. But it's an alternative which pretty much does the same thing.

Instead of Scrolling to the bottom of the screen, change the focus to a view which is located at the bottom of the screen.

That is, Replace:

scroll.scrollTo(0, scroll.getBottom()); 

with:

Footer.requestFocus(); 

Make sure you specify that the view, say 'Footer' is focusable.

android:focusable="true" android:focusableInTouchMode="true"