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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