DetailActivity.java 文件源码

private void setUpViewPager(ArrayList<Photo> photos) {
    viewPager = (ViewPager) findViewById(R.id.pager);
    viewPager.setAdapter(new DetailViewPagerAdapter(this, photos, sharedElementCallback));
    viewPager.setCurrentItem(initialItem);

    viewPager.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
        @Override
        public void onLayoutChange(View v, int left, int top, int right, int bottom,
                                   int oldLeft, int oldTop, int oldRight, int oldBottom) {
            if (viewPager.getChildCount() > 0) {
                viewPager.removeOnLayoutChangeListener(this);
                startPostponedEnterTransition();
            }
        }
    });

    viewPager.setPageMargin(getResources().getDimensionPixelSize(
            com.example.android.unsplash.base.R.dimen.padding_mini));
    viewPager.setPageMarginDrawable(R.drawable.page_margin);
}