ViewPager show prochaine et avant la rubrique prévisualisation sur l'écran

Enfin, je l'ai fait 🙂 j'ai modifier cette réponse Android - Carrousel comme widget qui affiche une partie de la gauche et de la droite des éléments

Vous pouvez regarder ce code.

//pager settings
pager.setClipToPadding(false);
pager.setPageMargin(24);
pager.setPadding(48, 8, 48, 8);
pager.setOffscreenPageLimit(3);
pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
Log.i("", "onPageScrolled: " + position);
CampaignPagerFragment sampleFragment = (CampaignPagerFragment) ((CampaignPagerAdapter) pager.getAdapter()).getRegisteredFragment(position);
float scale = 1 - (positionOffset * RATIO_SCALE);
//Just a shortcut to findViewById(R.id.image).setScale(scale);
sampleFragment.scaleImage(scale);
if (position + 1 < pager.getAdapter().getCount()) {
sampleFragment = (CampaignPagerFragment) ((CampaignPagerAdapter) pager.getAdapter()).getRegisteredFragment(position + 1);
scale = positionOffset * RATIO_SCALE + (1 - RATIO_SCALE);
sampleFragment.scaleImage(scale);
}
}
@Override
public void onPageSelected(int position) {
Log.i("", "onPageSelected: " + position);
}
@Override
public void onPageScrollStateChanged(int state) {
Log.i("", "onPageScrollStateChanged: " + state);
if (state == ViewPager.SCROLL_STATE_IDLE) {
CampaignPagerFragment fragment = (CampaignPagerFragment) ((CampaignPagerAdapter) pager.getAdapter()).getRegisteredFragment(pager.getCurrentItem());
fragment.scaleImage(1);
if (pager.getCurrentItem() > 0) {
fragment = (CampaignPagerFragment) ((CampaignPagerAdapter) pager.getAdapter()).getRegisteredFragment(pager.getCurrentItem() - 1);
fragment.scaleImage(1 - RATIO_SCALE);
}
if (pager.getCurrentItem() + 1 < pager.getAdapter().getCount()) {
fragment = (CampaignPagerFragment) ((CampaignPagerAdapter) pager.getAdapter()).getRegisteredFragment(pager.getCurrentItem() + 1);
fragment.scaleImage(1 - RATIO_SCALE);
}
}
}
});

---

//PagerAdapter
public class CampaignPagerAdapter extends FragmentStatePagerAdapter {
SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>();
public CampaignPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return 5;
}
@Override
public Fragment getItem(int position) {
return new CampaignPagerFragment();
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
Fragment fragment = (Fragment) super.instantiateItem(container, position);
registeredFragments.put(position, fragment);
return fragment;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
registeredFragments.remove(position);
super.destroyItem(container, position, object);
}
public Fragment getRegisteredFragment(int position) {
return registeredFragments.get(position);
}
}

ex: https://github.com/mrleolink/SimpleInfiniteCarousel..

Bonjour, Une chose qui manque
sampleFragment.scaleImage(à l'échelle);
C'est une méthode créée dans CampaignPagerFragment et de l'échelle du fragment rootView..

e.g public void scaleImage(float scaleX)
{
rootView.setScaleY(scaleX);
rootView.invalidate();
}

viewPager.setPageMargin(100);
viewPager.setPageTransformer(false, new ViewPager.PageTransformer()
{
@Override
public void transformPage(View page, float position)
{
int pageWidth = viewPager.getMeasuredWidth() -
viewPager.getPaddingLeft() - viewPager.getPaddingRight();
int pageHeight = viewPager.getHeight();
int paddingLeft = viewPager.getPaddingLeft();
float transformPos = (float) (page.getLeft() -
(viewPager.getScrollX() + paddingLeft)) / pageWidth;
int max = pageHeight / 10;
if (transformPos < -1)
{
//[-Infinity,-1)
//This page is way off-screen to the left.
page.setAlpha(0.5f);//to make left transparent
page.setScaleY(0.7f);
}
else if (transformPos <= 1)
{
//[-1,1]
page.setScaleY(1f);
}
else
{
//(1,+Infinity]
//This page is way off-screen to the right.
page.setAlpha(0.5f);//to make right transparent
page.setScaleY(0.7f);
}
}
});