import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.View;
public class ReadViewPager extends ViewPager
{public ReadViewPager(Context context){super(context);}public ReadViewPager(Context context, AttributeSet attrs){super(context, attrs);setAnima();}public void setAnima(){setPageTransformer(true, new PageTransformer(){private static final float MIN_SCALE = 0.75f;@Overridepublic void transformPage(View view, float position){int pageWidth = view.getWidth();int pageHeight =view.getHeight();if (position < -1){// [-Infinity,-1)// This page is way off-screen to the left.view.setAlpha(0);}else if (position <= 0){// [-1,0]// Use the default slide transition when moving to the left pageview.setAlpha(1);view.setTranslationX(0);view.setScaleX(1);view.setScaleY(1);}else if (position <= 1){// (0,1]// Fade the page out.view.setAlpha(1 - position);
//
//                    // Counteract the default slide transition
//                    view.setAlpha(1);view.setTranslationX(pageWidth * -position);
//
//                    // Scale the page down (between MIN_SCALE and 1)float scaleFactor = MIN_SCALE+ (1 - MIN_SCALE) * (1 - Math.abs(position));view.setScaleX(scaleFactor);view.setScaleY(scaleFactor);}else{// (1,+Infinity]// This page is way off-screen to the right.view.setAlpha(0);}}});}
}

// PagerAdapter只缓存三张要显示的图片，如果滑动的图片超出了缓存的范围，就会调用这个方法，将图片销毁//在这里不能重写
//    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {////        super.destroyItem(container, position, object);
//    }

setPageTransformer(true, new PageTransformer() {private static final float MIN_SCALE = 0.75f;@Overridepublic void transformPage(View view, float position) {int pageWidth = view.getWidth();int pageHeight =view.getHeight();if (position < -1) { // [-Infinity,-1)// This page is way off-screen to the left.view.setAlpha(0);} else if (position <= 0) { // [-1,0]// Use the default slide transition when moving to the left pageview.setAlpha(1);view.setTranslationX(0);view.setScaleX(1);view.setScaleY(1);} else if (position <= 1) { // (0,1]// Fade the page out.
//                    view.setAlpha(1 - position);
//
//                    // Counteract the default slide transitionview.setAlpha(1);view.setTranslationX(pageWidth * -position);
//
//                    // Scale the page down (between MIN_SCALE and 1)
//                    float scaleFactor = MIN_SCALE
//                            + (1 - MIN_SCALE) * (1 - Math.abs(position));
//                    view.setScaleX(scaleFactor);
//                    view.setScaleY(scaleFactor);
} else { // (1,+Infinity]// This page is way off-screen to the right.view.setAlpha(0);}}});