高质量的客户端引导动画效果
高质量的客户端引导动画效果
《高质量的客户端引导动画效果》，高仿500px客户端欢迎页面。
主要实现，通过ViewPager加载每一个fragment.创建一个引导页adapter即GuideAdapter，
设置viewpager缓存页数,默认的缓存一页,因为引导页共有4页,所以设置缓存3页,
这样所以page在滑动过程中不会重新创建，每一个fragment切换的时候通过HKTransformer动画实现效果。
代码来源：https://github.com/hanks-zyh/500px-guideview
部分内容如下：
/**
* by Hanks
*/
class HKTransformer implements ViewPager.PageTransformer {
@Override
public void transformPage(View view, float position) {
if (fragment00.getView() == view) {
Log.i("", "view: " + view + "position= " + position);
currentPosition = position;
}
blurringView.invalidate();
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
} else if (position <= 0) { // [-1,0]
// Use the default slide transition when moving to the left page
} else if (position <= 1) { // (0,1]
// Fade the page out.
float p = Math.abs(position);
float f = (1 - p);
Log.i("", "p= " + p);
// p : 1~0
// f : 0~1
iv_final_photo.setPivotY(0f);
iv_final_photo.setPivotX(iv_final_photo.getWidth() / 2);
if (-1 < currentPosition && currentPosition <= 0) {
// A ~ B 界面的动画
iv_initial_phone.setTranslationY(-600 * f);
iv_initial_phone.setScaleX(0.5f * p + 0.5f);
iv_initial_phone.setScaleY(0.5f * p + 0.5f);
iv_device.setScaleX(1 + 2 * f);
if (p > 0.5 && p <= 1) {
iv_device.setAlpha(2 * p - 1);
} else {
iv_device.setAlpha(0f);
}
ll_comments.setTranslationY(800 * p);
ll_comments.setAlpha(f);
ll_comments.setScaleX(2 - f);
ll_comments.setScaleY(2 - f);
ll_rows.setTranslationY(-1000 - 500 * p);
ll_rows.setAlpha(0.5f);
iv_final_photo.setTranslationY(-1000 - 500 * p);
iv_final_photo.setAlpha(0.5f);
tv_avatar_you.setTranslationY(-300);
tv_register.setTranslationY(300);
} else if (-2 < currentPosition && currentPosition <= -1) {
// B ~ C 界面的动画
iv_initial_phone.setTranslationY(-600 + -300 * f);
ll_comments.setAlpha(p);
ll_rows.setTranslationY(-1000 * p);
ll_rows.setAlpha(0.5f + 0.5f * f);
iv_final_photo.setTranslationY(-1000 * p);
iv_final_photo.setAlpha(0.5f + 0.5f * f);
tv_avatar_you.setTranslationY(-300);
tv_register.setTranslationY(300);
} else if (-3 < currentPosition && currentPosition <= -2) {
// C ~ D 界面的动画
iv_final_photo.setScaleX(1 + 3 * f); //1~3
iv_final_photo.setScaleY(1 + 3 * f); //1~3
for (int i = 0; i < ll_rows.getChildCount(); i++) {
View child = ll_rows.getChildAt(i);
child.setAlpha(p);
if (i % 2 == 0) {
child.setTranslationX(100 * f);
} else {
child.setTranslationX(-100 * f);
}
}
tv_avatar_you.setTranslationY(-300 + 300 * f);
tv_register.setTranslationY(300 - 300 * f);
}
} else { // (1,+Infinity]
// This page is way off-screen to the right.
}
}
}
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