首先阅读这个。然后应用您自己的PageTransformer
实现。可以像这样:
public class DepthPageTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.5f;
private static final float MAX_SCALE = 0.8f;
private static final float MIN_FADE = 0.2f;
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
if (position < -1) {
view.setAlpha(MIN_FADE);
} else if (position < 0) {
view.setAlpha(1 + position * (1 - MIN_FADE));
view.setTranslationX(-pageWidth * MAX_SCALE * position);
ViewCompat.setTranslationZ(view, position);
float scaleFactor = MIN_SCALE
+ (MAX_SCALE - MIN_SCALE) * (1 - Math.abs(position));
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
} else if (position == 0) {
view.setAlpha(1);
view.setTranslationX(0);
view.setScaleX(MAX_SCALE);
ViewCompat.setTranslationZ(view, 0);
view.setScaleY(MAX_SCALE);
} else if (position <= 1) {
ViewCompat.setTranslationZ(view, -position);
view.setAlpha(1 - position * (1 - MIN_FADE));
view.setTranslationX(pageWidth * MAX_SCALE * -position);
float scaleFactor = MIN_SCALE
+ (MAX_SCALE - MIN_SCALE) * (1 - Math.abs(position));
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
} else {
view.setAlpha(MIN_FADE);
}
}
}
public class MyPager extends ViewPager {
public MyPager(Context context) {
this(context, null);
}
public MyPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected int getChildDrawingOrder(int childCount, int i) {
if(i == childCount - 1) {
return getCurrentItem();
} else {
return i >= getCurrentItem()? i + 1 : i;
}
}
}
ViewPager.setOffscreenPageLimit
设置为2或更多,如果屏幕上有更多可见页面。MyPager
和PagerAdapter的布局,就这些。 - artkoenig