android ViewPager - detect page scroll state

Question

I have a ViewPager with a Listener:

viewpager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageSelected(int arg0) { } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { if (position == 0) { tv.setText("first Item"); } else tv.setText(titleStringArray[position]); } @Override public void onPageScrollStateChanged(int arg0) { } });

What I need: tv is a TextView above the ViewPager, currently the text changes as soon as the user has moved the page (even very little movement is registered). I want to change the text ONLY if the page was moved to left or right by 50% or above. Any suggestions?

it seems to me that you're trying to do some type of title on your pages. So why not use the PagerTitleStrip?? developer.android.com/reference/android/support/v4/view/… It could make a lot of stuff easier for you. Ps.: I'm posting as a comment because I'm aware that I'm not answering your question, but supplying possible alternatives. — Budius
– Budius, Commented Feb 21, 2013 at 12:35
Thanks. Yeah I know about the titleStrip, but my ViewPager is just 60dp x 200dp, so in that case that really doesn't matter if I use a TitleStrip or just a TextView — Droidman
– Droidman, Commented Feb 21, 2013 at 13:11

Amir · Accepted Answer · 2015-09-08 13:07:19Z

I solved as follows,

Initialize variable.

static int mPageLastScreen=0;

then add if statement in onPageScrolled method.

viewPager.setOnPageChangeListener(new OnPageChangeListener() { public void onPageScrollStateChanged(int state) {} public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { if(mPageLastScreen!=position) { Log.d("page scrolled", "Page scrolled"); mPageLastScreen=position; } } public void onPageSelected(int position) {} });

I know it is Late reply. Hope it helps someone:)

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