Scrollview not scrolling down completely

Question

I'm building a chat-like application that displays text the user inputs to the screen using a scrollview. What I'm doing is auto-scrolling the scrollview down as more text is appended to the screen. I'm using

 ScrollView my_scrollview = (ScrollView) findViewById(R.id.scroller);
 my_scrollview.fullScroll(ScrollView.FOCUS_DOWN);

This seems to work, although for some reason, because the keyboard is usually on screen while chatting, when the scrollview scrolls down it doesn't completely - the newest textview added is not displayed (you'll have to manually scroll down to the newest one). How do I go about fixing this?

Best solutions is https://stackoverflow.com/a/34866634/3496570 — Zar E Ahmer, Jun 22 '18 at 12:53

Malfunction · Accepted Answer · 2018-10-18T07:36:23.477

41

I looked around, and found that some other people have run into the same problem.

I solved this problem using this piece of code:

final ScrollView scrollView = (ScrollView) findViewById(R.id.scroll_view);
scrollView.post(new Runnable() {
    public void run() {
        scrollView.fullScroll(View.FOCUS_DOWN);
    }
});

Hopefully this can help somebody out there!

edited Oct 18 '18 at 07:36

answered Feb 15 '13 at 15:20

Malfunction

1,324
4
15
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2

Did not work at first, then used "postDelayed" as suggested in a comment to the other answer. – G B Nov 02 '16 at 12:05

score 15 · Answer 2 · answered Aug 03 '13 at 20:36

Its late but may help some one with this issue.. It takes around 200 miniseconds to add the last element and update it for a scrollView so this will surely work.

void scrollDown()
{
    Thread scrollThread = new Thread(){
        public void run(){
            try {
                sleep(200);
                ChatActivity.this.runOnUiThread(new Runnable() {
                    public void run() {
                        myScrollView.fullScroll(View.FOCUS_DOWN);
                    }    
                });
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    };
    scrollThread.start();
}

Just call scrollDown(); after adding element to scrollView.

You could also use `my_scrollview.postDelayed(new Runnable(){...}, 200)` — Wirling, May 04 '15 at 12:13

score 2 · Answer 3 · answered Sep 27 '21 at 20:50

2

Did it this way on Xamarin Android project:

var scrollView = FindViewById<ScrollView>(Resource.Id.scrolview); 

scrollView.Post(() =>
{
    scrollView.FullScroll(FocusSearchDirection.Down);
});

Thanks to OP.

answered Sep 27 '21 at 20:50

Renato Wong

61
7

score 0 · Answer 4 · answered Oct 17 '18 at 20:00

0

        @Override
        public void onClick(View v) {

            scview_ashora = findViewById(R.id.scview_ashora);
            scview_ashora.fullScroll(ScrollView.FOCUS_DOWN);

            scview_ashora.postDelayed(new Runnable() {
                @Override
                public void run() {
                    //replace this line to scroll up or down
                    scview_ashora.fullScroll(ScrollView.FOCUS_DOWN);
                }
            }, 1000000L);


        }
    });

answered Oct 17 '18 at 20:00

king.web2116

1
1

2

Welcome to SO! Code-only answers are discouraged here, as they provide no insight into how the problem was solved. Please update your solution with an explanation of how your code solves the problem at hand :) – Joel Oct 17 '18 at 20:21

Scrollview not scrolling down completely

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