TrackPageIndicator trackPageIndicator = (TrackPageIndicator)findViewById(R.id.indicator);
trackPageIndicator.setViewPager(viewPager, new ArrayList<IGetSnapshot>());IGetSnapshot is a interface:
public interface IGetSnapshot{
View getOrgSnapshot(); //return the original view.
void getAftSnapshot(View orgView); //the view that will change by swipe the viewpager
}Gradle
compile 'andy.ayaseruri.trackpageindicator:lib:1.0.0'Maven
<groupId>andy.ayaseruri.trackpageindicator</groupId>
<artifactId>lib</artifactId>
<version>1.0.0</version>thanks to