Backwards compatible PageTransformer

Question

I\'m trying to animate items in a ViewPager and the PageTransformer fits the bill. I want it to be backwards compatible to Android 2.2 so am using the support v4 library. Ho

Answer 1

As @mark.kedzierski said copied the ViewPager class from here and removed the if statement for the version (check below) and called it TransformableViewPager

public void setPageTransformer(boolean reverseDrawingOrder, PageTransformer transformer) {
    if (Build.VERSION.SDK_INT >= 11) {
        final boolean hasTransformer = transformer != null;
        final boolean needsPopulate = hasTransformer != (mPageTransformer != null);
        mPageTransformer = transformer;
        setChildrenDrawingOrderEnabledCompat(hasTransformer);
        if (hasTransformer) {
            mDrawingOrder = reverseDrawingOrder ? DRAW_ORDER_REVERSE : DRAW_ORDER_FORWARD;
        } else {
            mDrawingOrder = DRAW_ORDER_DEFAULT;
        }
        if (needsPopulate) populate();
    }
}

I also had to change all PageTransformer to ViewPager.PageTransformer. Then did the transformations in a custom PageTranformer like this,

if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.HONEYCOMB){
    // > 11 version
    view.setAlpha(0);
}
else
{
    // Nine Old Androids version
    ViewHelper.setAlpha(view, 0);
 }

Ithink proxy can also be used so you don't have to write the version check.This worked even for 2.2