该ViewPager和正常的ViewPager的使用方式是一样的,只不过是垂直滑动的。
下面是这个ViewPager的代码
/**
* 垂直滑动的ViewPager
*/
public class VerticalViewPager extends ViewPager { public VerticalViewPager(Context context) {
this(context, null);
} public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
} @Override
public boolean canScrollHorizontally(int direction) {
return false;
} @Override
public boolean canScrollVertically(int direction) {
return super.canScrollHorizontally(direction);
} private void init() {
setPageTransformer(true, new VerticalPageTransformer());
setOverScrollMode(View.OVER_SCROLL_NEVER);
} @Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final boolean toIntercept = super.onInterceptTouchEvent(flipXY(ev));
flipXY(ev);
return toIntercept;
} @Override
public boolean onTouchEvent(MotionEvent ev) {
final boolean toHandle = super.onTouchEvent(flipXY(ev));
flipXY(ev);
return toHandle;
} private MotionEvent flipXY(MotionEvent ev) {
final float width = getWidth();
final float height = getHeight();
final float x = (ev.getY() / height) * width;
final float y = (ev.getX() / width) * height;
ev.setLocation(x, y);
return ev;
} private static final class VerticalPageTransformer implements ViewPager.PageTransformer {
@Override
public void transformPage(View view, float position) {
final int pageWidth = view.getWidth();
final int pageHeight = view.getHeight();
if (position < -1) {
view.setAlpha(0);
} else if (position <= 1) {
view.setAlpha(1);
view.setTranslationX(pageWidth * -position);
float yPosition = position * pageHeight;
view.setTranslationY(yPosition);
} else {
view.setAlpha(0);
}
}
}
}