Android实现卡片翻转动画

最近项目上用到了卡片的翻转效果，大致研究了下，也参考了网上的一些Demo，简单实现如下：
activity_main.xml<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/card_main_container"
android:layout_height="match_parent"
android:layout_width="match_parent">

<include layout="@layout/activity_card_back"/>

<include layout="@layout/activity_card_front"/>
</FrameLayout>可以看出，用到了两个布局activity_card_back.xml<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/card_back_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:layout_marginRight="@dimen/activity_horizontal_margin"
android:layout_marginBottom="@dimen/activity_vertical_margin"
android:background="@drawable/shape_card_back_bg"
android:orientation="vertical">

<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="背面"
android:textSize="30sp"/>
</LinearLayout>activity_card_front.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/card_font_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:layout_marginRight="@dimen/activity_horizontal_margin"
android:layout_marginBottom="@dimen/activity_vertical_margin"
android:background="@drawable/shape_card_front_bg"
android:orientation="vertical">

<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="正面"
android:textSize="30sp"/>
</LinearLayout>

附上自定义的图片：
shape_card_back_bg.xml<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="30dp"/>
<solid android:color="@android:color/holo_red_light"/>
</shape>shape_card_front_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="30dp"/>
<solid android:color="@android:color/darker_gray"/>
</shape>

主要的逻辑如下：

package com.jackie.flipanimationdemo;

import android.animation.Animator;
import android.animation.AnimatorInflater;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private FrameLayout mCardMainContainer;
private LinearLayout mCardFontContainer, mCardBackContainer;

private AnimatorSet mRightOutAnimatorSet, mLeftInAnimatorSet;

private boolean mIsShowBack = false;  //是否显示背面

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

initView();
initEvent();
}

private void initView() {
mCardMainContainer = (FrameLayout) findViewById(R.id.card_main_container);
mCardFontContainer = (LinearLayout) findViewById(R.id.card_font_container);
mCardBackContainer = (LinearLayout) findViewById(R.id.card_back_container);

setAnimators(); // 设置动画
setCameraDistance(); // 设置镜头距离
}

private void initEvent() {
mCardMainContainer.setOnClickListener(this);
}

private void setAnimators() {
mRightOutAnimatorSet = (AnimatorSet) AnimatorInflater.loadAnimator(this, R.animator.anim_right_out);
mLeftInAnimatorSet = (AnimatorSet) AnimatorInflater.loadAnimator(this, R.animator.anim_left_in);

// 设置点击事件
mRightOutAnimatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
mCardMainContainer.setClickable(false);
}
});

mLeftInAnimatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
mCardMainContainer.setClickable(true);
}
});
}

private void setCameraDistance() {
int distance = 16000;
float scale = getResources().getDisplayMetrics().density * distance;
mCardFontContainer.setCameraDistance(scale);
mCardBackContainer.setCameraDistance(scale);
}

private void flipCard() {
if (!mIsShowBack) {  // 正面朝上
mRightOutAnimatorSet.setTarget(mCardFontContainer);
mLeftInAnimatorSet.setTarget(mCardBackContainer);
mRightOutAnimatorSet.start();
mLeftInAnimatorSet.start();
mIsShowBack = true;
} else { // 背面朝上
mRightOutAnimatorSet.setTarget(mCardBackContainer);
mLeftInAnimatorSet.setTarget(mCardFontContainer);
mRightOutAnimatorSet.start();
mLeftInAnimatorSet.start();
mIsShowBack = false;
}
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.card_main_container:
flipCard();
break;
}
}
}

用到一些动画的资源：anim_left_in.xml<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<!--消失-->
<objectAnimator
android:duration="0"
android:propertyName="alpha"
android:valueFrom="1.0"
android:valueTo="0.0"/>

<!--旋转-->
<objectAnimator
android:duration="@integer/anim_length"
android:propertyName="rotationY"
android:valueFrom="-180"
android:valueTo="0"/>

<!--出现-->
<objectAnimator
android:duration="0"
android:propertyName="alpha"
android:startOffset="@integer/anim_half_length"
android:valueFrom="0.0"
android:valueTo="1.0"/>
</set>anim_right_out.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<!--旋转-->
<objectAnimator
android:duration="@integer/anim_length"
android:propertyName="rotationY"
android:valueFrom="0"
android:valueTo="180"/>

<!--消失-->
<objectAnimator
android:duration="0"
android:propertyName="alpha"
android:startOffset="@integer/anim_half_length"
android:valueFrom="1.0"
android:valueTo="0.0"/>
</set>

用到了属性动画，为了兼容性，别忘了如下配置：



效果图如下：