i trying make imageview swiping images on touch motion, when motion next image, got error saying:
java.lang.nullpointerexception: attempt invoke virtual method 'void android.widget.imageview.setbackground(android.graphics.drawable.drawable)' on null object reference @ com.semicolon.www.slider.mainactivity.ontouchevent(mainactivity.java:48)
here code:
public class mainactivity extends actionbaractivity { imageswitcher switch; imageview image; float intialx; private cursor cursor; private int columnindex, position = 0; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); switch = (imageswitcher) findviewbyid(r.id.imageswitcher); image = (imageview) findviewbyid(r.id.image); } public boolean ontouchevent(motionevent event){ switch (event.getaction()) { case motionevent.action_down: intialx = event.getx(); break; case motionevent.action_up: float finalx = event.getx(); if (intialx > finalx) { drawable r = getresources().getdrawable(r.drawable.img2); image.setbackground(r); } break; } return false; } } so how can fix error , put image (or background) imageview?
try using viewpager instead of imageswitcher
http://developer.android.com/reference/android/support/v4/view/viewpager.html
