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<h1 class="post-title">在Android上实现无限翻页轮播动画效果</h1>
<section class="post-meta">
<!-- <a href='/'>Tao He</a> -->
<time class="post-date" datetime="2017-07-12">12 Jul 2017</time>
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on
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<p>最近在工作中遇到一个需求，要求在一个Dialog的标题上显示两行字，但是这行字如果同时出现的话会非常难看，设计出了套方案，类似无限翻页轮播这两行字，要有翻书的效果。
刚开始实现的时候，动画的效果也出来了，但是拿去给设计验收的时候设计总感觉怪怪的，始终达不到设计最终想要的结果。后来通过好多次的调试和验证，发现问题出现在两个
View的动画播放时序和旋转轴的问题上，解决了这两个问题后再拿去给设计看的时候，一切都完美了。 现在这个比较好的设计也已上线， 也因为这个调试和验证的过程感觉对
Android动画的一些细节碰触的较多，所以写下此文记录下这个过程。</p>
<h4 id="基本原理">基本原理</h4>
<p>通过<code class="language-plaintext highlighter-rouge">ObjectAnimation</code>操作<code class="language-plaintext highlighter-rouge">View</code>的<code class="language-plaintext highlighter-rouge">RotationY</code>属性，再利用动态改变<code class="language-plaintext highlighter-rouge">PivotY</code>的值和动画播放时序的不同来模拟出无限翻页轮播的动画效果</p>
<h4 id="objectanimation">ObjectAnimation</h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>
// 上面的View翻下去的动画
private static ObjectAnimator aboveViewPageDownAnim;
// 下面的View翻上去的动画
private static ObjectAnimator belowViewPageUpAnim;
// 上面的View翻上去的动画
private static ObjectAnimator aboveViewPageUpAnim;
// 下面的View翻下去的动画
private static ObjectAnimator belowViewPageDownAnim;
</code></pre></div></div>
<h4 id="关键的常量">关键的常量</h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>// 翻页动画的播放时长
private static int pageUpDownDurition = 500;
// 翻下播放结束前100翻上就开始播放
private static int pageUpBeforeDownEnd = 400;
// 翻上播放完后停留时间
private static int belowViewStayInterval = 800;
// 在Y轴底部翻转
private static int pageUpPivotY = 100;
// 在Y近顶部的位置翻转
private static int pageDownPivotY = 70;
</code></pre></div></div>
<h4 id="具体实现">具体实现</h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>
public static void startPageUpDownAnimation(final View aboveView, final View belowView) {
aboveViewPageDownAnim = ObjectAnimator.ofPropertyValuesHolder(aboveView,
PropertyValuesHolder.ofFloat(View.ROTATION_X, 0, 90));
aboveViewPageDownAnim.setDuration(pageUpDownDurition);
aboveViewPageDownAnim.setInterpolator(new LinearInterpolator());
aboveViewPageDownAnim.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
aboveView.setPivotY(pageDownPivotY);
belowView.setVisibility(View.GONE);
belowView.postDelayed(new Runnable() {
@Override
public void run() {
belowViewPageUpAnim.start();
}
}, pageUpBeforeDownEnd);
}
@Override
public void onAnimationEnd(Animator animator) {
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
belowViewPageUpAnim = ObjectAnimator.ofPropertyValuesHolder(belowView,
PropertyValuesHolder.ofFloat(View.ROTATION_X, -90, 0));
belowViewPageUpAnim.setDuration(pageUpDownDurition);
belowViewPageUpAnim.setInterpolator(new LinearInterpolator());
belowViewPageUpAnim.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
belowView.setVisibility(View.VISIBLE);
belowView.setPivotY(pageUpPivotY);
}
@Override
public void onAnimationEnd(Animator animator) {
belowView.postDelayed(new Runnable() {
@Override
public void run() {
belowViewPageDownAnim.start();
}
}, belowViewStayInterval);
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
belowViewPageDownAnim = ObjectAnimator.ofPropertyValuesHolder(belowView,
PropertyValuesHolder.ofFloat(View.ROTATION_X, 0, 90));
belowViewPageDownAnim.setDuration(pageUpDownDurition);
belowViewPageDownAnim.setInterpolator(new LinearInterpolator());
belowViewPageDownAnim.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
belowView.setPivotY(pageDownPivotY);
aboveView.setVisibility(View.GONE);
aboveView.postDelayed(new Runnable() {
@Override
public void run() {
aboveViewPageUpAnim.start();
}
}, pageUpBeforeDownEnd);
}
@Override
public void onAnimationEnd(Animator animator) {
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
aboveViewPageUpAnim = ObjectAnimator.ofPropertyValuesHolder(aboveView,
PropertyValuesHolder.ofFloat(View.ROTATION_X, -90, 0));
aboveViewPageUpAnim.setDuration(pageUpDownDurition);
aboveViewPageUpAnim.setInterpolator(new LinearInterpolator());
aboveViewPageUpAnim.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
aboveView.setVisibility(View.VISIBLE);
aboveView.setPivotY(pageUpPivotY);
}
@Override
public void onAnimationEnd(Animator animator) {
aboveView.postDelayed(new Runnable() {
@Override
public void run() {
aboveViewPageDownAnim.start();
}
}, belowViewStayInterval);
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
aboveViewPageDownAnim.start();
}
</code></pre></div></div>
<p>其实这个实现已经是一个基本比较通用的翻页动画了，不仅可以用于TextView，ImageView应该也没有问题。</p>
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