Java tutorial
/* * * MIT License * * Copyright (c) 2017 Alibaba Group * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * */ package com.tmall.ultraviewpager.transformer; import android.support.v4.view.ViewPager; import android.view.View; /** * Created by mikeafc on 15/12/3. */ public class UltraScaleTransformer implements ViewPager.PageTransformer { private static final float MIN_SCALE = 0.75f; @Override public void transformPage(View page, float position) { final int pageWidth = page.getWidth(); final float scaleFactor = MIN_SCALE + (1 - MIN_SCALE) * (1 - Math.abs(position)); if (position < 0) { // [-1,0] // Scale the page down (between MIN_SCALE and 1) page.setScaleX(scaleFactor); page.setScaleY(scaleFactor); } else if (position == 0) { page.setScaleX(1); page.setScaleY(1); } else if (position <= 1) { // (0,1] // Scale the page down (between MIN_SCALE and 1) page.setScaleX(scaleFactor); page.setScaleY(scaleFactor); } } }