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高质量的客户端引导动画效果

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介绍:

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.
            }
        }
    }

运行效果: