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：

效果图：

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