how to implement Scroller in textview for auto scrolling?

Question

I have used scroller for auto scrolling, but it keeps on scrolling even when text gets over. I want to find the position and want to stop scrolling automatically, so thta text comes to its initial position as during text scrolling text gets over. How can i do this?

The code used for autoscrolling is:

public void Scroll()
{
    //text = (TextView) findViewById(R.id.TxtView);
    length = text.getLineCount();
    scroll.computeScrollOffset();
    text.setScroller(scroll);
    int a = text.getBottom();
    int b = text.getTop();
    //scroll.extendDuration(scroll.getFinalY());
    scroll.startScroll(scroll_x, scroll_y, 0, a, (500000)/ speedAmount);    
}

100rabh · Accepted Answer · 2010-11-30T06:22:43.490

1

Nikki

You need to check the source code here .

again text must comes to its initial position

for this use scrollTo(0, 0);

i want to find the position

use scroll.getCurrX();

want to stop scrolling automatically

use scroll.abortAnimation();

& you are done!:)

EDITED:

Nikki,I wrote a class derived from Android.Widget.TextView to customize a TextView in which text can be scrolled until text is finished & after finishing text comes back to initial position.All you need to do is create custom class as defined here & just override computeScroll () as below

public void computeScroll() {
super.computeScroll();

if (null == mSlr) return;

if (mSlr.isFinished() && (!mPaused)) {
scrollTo(0, 0);//scroll to initial position or whatever position you want it to scroll 
}
}

edited Nov 30 '10 at 06:22

answered Nov 29 '10 at 08:47

100rabh

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@Nikki Do you mean to scroll just once? You can use scroll.isFinished() to check whether scrolling text finished & then scroll.abortAnimation() . I hope I am in the right direction in helping you. – 100rabh Nov 29 '10 at 09:56
@Nikki I implemented the code & it worked for me.Let me rephrase your problem statement:You want a textview that scrolls until the end of the text & stops scrolling & then show you the text at initial position. – 100rabh Nov 29 '10 at 12:39
do you have used isfinished() after startscroll() or somewhere else as isfinished() not working after startscroll() – Nikki Nov 30 '10 at 03:52
what is mPaused variable mean – Nikki Nov 30 '10 at 06:44
@Nikki didn't you implemented the code at link http://bear-polka.blogspot.com/2009/01/scrolltextview-scrolling-textview-for.html.mPaused is defined there – 100rabh Nov 30 '10 at 08:36
you are extending text view while i am using as a part in my activity.Moreover, you are using horzontal scrolling and i am using vertical – Nikki Nov 30 '10 at 11:21
Nikki Did you checked startScroll method it has got options to scroll in any direction you wish so just change startScroll. – 100rabh Nov 30 '10 at 12:00
Nikki it seems that you need to rewrite the question to be more understandable & informative – 100rabh Dec 02 '10 at 05:59
@100rabh Hi, I've implemented the Scrolling Textview from the link [http://bear-polka.blogspot.in/2009/01/scrolltextview-scrolling-textview-for.html]. But, the textview scrolling is not smooth and appears shaky. Any idea how this can be resolved. – jasdmystery Jun 05 '13 at 07:06

score 0 · Answer 2 · answered Dec 01 '10 at 06:51

0

Your question inspired me to blog about this as I had similar problem just some days ago: http://b.ivity.asia/2010/12/01/extended-marquee-in-android/

I wanted to use a very custom Marquee effect, this class should be able to do the job for you.

answered Dec 01 '10 at 06:51

Sebastian Roth

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But i want to add vertical scrolling – Nikki Dec 02 '10 at 04:44

how to implement Scroller in textview for auto scrolling?

2 Answers2

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