今天去官网看了一下ViewPager的滑动效果,google官方给出了两个sample,都是通过设置
ViewPager的setPageTransformer(boolean agr0, PageTransformer agr1);这个方法去设置的,但是在PageTransformer这个类里面都是用到了3.x系统以后才支持的api,附上官方源码 public class ZoomOutPageTransformer implements ViewPager.PageTransformer {
private static float MIN_SCALE = 0.85f;
private static float MIN_ALPHA = 0.5f; public 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 <= 1) { // [-1,1]
// Modify the default slide transition to shrink the page as well
float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
float vertMargin = pageHeight * (1 - scaleFactor) / 2;
float horzMargin = pageWidth * (1 - scaleFactor) / 2;
if (position < 0) {
view.setTranslationX(horzMargin - vertMargin / 2);
} else {
view.setTranslationX(-horzMargin + vertMargin / 2);
} // Scale the page down (between MIN_SCALE and 1)
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor); // Fade the page relative to its size.
view.setAlpha(MIN_ALPHA +
(scaleFactor - MIN_SCALE) /
(1 - MIN_SCALE) * (1 - MIN_ALPHA)); } else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
对于动画这一块,我还是不太熟悉,有没有人做过类似的东西呢。大家多交流~~~
ViewPager的setPageTransformer(boolean agr0, PageTransformer agr1);这个方法去设置的,但是在PageTransformer这个类里面都是用到了3.x系统以后才支持的api,附上官方源码 public class ZoomOutPageTransformer implements ViewPager.PageTransformer {
private static float MIN_SCALE = 0.85f;
private static float MIN_ALPHA = 0.5f; public 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 <= 1) { // [-1,1]
// Modify the default slide transition to shrink the page as well
float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
float vertMargin = pageHeight * (1 - scaleFactor) / 2;
float horzMargin = pageWidth * (1 - scaleFactor) / 2;
if (position < 0) {
view.setTranslationX(horzMargin - vertMargin / 2);
} else {
view.setTranslationX(-horzMargin + vertMargin / 2);
} // Scale the page down (between MIN_SCALE and 1)
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor); // Fade the page relative to its size.
view.setAlpha(MIN_ALPHA +
(scaleFactor - MIN_SCALE) /
(1 - MIN_SCALE) * (1 - MIN_ALPHA)); } else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
对于动画这一块,我还是不太熟悉,有没有人做过类似的东西呢。大家多交流~~~
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