1，上周我们实现了简单的三阶贝塞尔曲线效果实例，今天是使用二阶贝塞尔曲线加动画实现的加入购物车效果，在码代码过程中出现了些问题，过一下和大家来探讨探讨，先看一下效果图
2,从上面的效果来看我们基本上可以把功能拆分为两个动画效果：+号图片按照曲线掉下（曲线的轨迹就是一个简单的贝塞尔曲线）、购物车图标从缩小到放大。知道了实现的原理我们开始我们功能的实现
- 实现基本基本布局、RecyclerView展示数据
从上面的效果我们可以得到，我们的布局是一个简单的RecyclerView和下面的RelativeLayout,布局文件如下：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:id="@+id/main_layout"tools:context="com.qianmo.beziershopcart.MainActivity"><android.support.v7.widget.RecyclerViewandroid:id="@+id/recycler"android:layout_width="match_parent"android:layout_height="match_parent"></android.support.v7.widget.RecyclerView><LinearLayoutandroid:id="@+id/shopping_cart_bottom"android:layout_width="match_parent"android:layout_height="50dp"android:layout_alignParentBottom="true"android:background="#fd383838"android:orientation="horizontal"></LinearLayout><FrameLayoutandroid:id="@+id/shopping_cart_layout"android:layout_width="60dp"android:layout_height="60dp"android:layout_alignParentBottom="true"android:layout_marginBottom="5dp"android:layout_marginLeft="35dp"android:background="@drawable/circle"android:clickable="true"><ImageViewandroid:id="@+id/shopping_cart"android:layout_width="35dp"android:layout_height="35dp"android:layout_gravity="center"android:src="@mipmap/ic_shopping_cart_white_24dp"/></FrameLayout>
</RelativeLayout>
添加Shop实体类、添加RecyclerView的Adapter
package com.qianmo.beziershopcart;/*** Created by wangjitao on 2017/4/10 0010.* E-Mail：543441727@qq.com*/public class ShopBean {private String title;private String price;private int count;public ShopBean(String title, String price, int count) {this.title = title;this.price = price;this.count = count;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getPrice() {return price;}public void setPrice(String price) {this.price = price;}public int getCount() {return count;}public void setCount(int count) {this.count = count;}
}
适配器
package com.qianmo.beziershopcart;import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;import java.util.List;/*** Created by Administrator on 2017/4/10 0010.* E-Mail：543441727@qq.com*/public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {private List<ShopBean> datas;private Context mContext;private ShopOnClickListtener mShopOnClickListtener;public MyAdapter(List<ShopBean> datas, Context mContext) {this.datas = datas;this.mContext = mContext;}@Overridepublic MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {return new ViewHolder(LayoutInflater.from(mContext).inflate(R.layout.item_shop_menu, parent, false));}@Overridepublic void onBindViewHolder(MyAdapter.ViewHolder holder, final int position) {holder.shop_name.setText(datas.get(position).getTitle());holder.shop_price.setText(datas.get(position).getPrice());holder.count.setText(datas.get(position).getCount() + "");holder.ic_add.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (mShopOnClickListtener != null) {mShopOnClickListtener.add(v, position);}}});holder.ic_reduce.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (mShopOnClickListtener != null) {mShopOnClickListtener.remove(v, position);}}});}@Overridepublic int getItemCount() {return datas == null ? 0 : datas.size();}public class ViewHolder extends RecyclerView.ViewHolder {TextView shop_name;TextView shop_price;TextView count;ImageView ic_add;ImageView ic_reduce;public ViewHolder(View itemView) {super(itemView);shop_name = (TextView) itemView.findViewById(R.id.tv_title);shop_price = (TextView) itemView.findViewById(R.id.tv_price);count = (TextView) itemView.findViewById(R.id.tv_count);ic_add = (ImageView) itemView.findViewById(R.id.iv_add);ic_reduce = (ImageView) itemView.findViewById(R.id.iv_remove);}}public ShopOnClickListtener getShopOnClickListtener() {return mShopOnClickListtener;}public void setShopOnClickListtener(ShopOnClickListtener mShopOnClickListtener) {this.mShopOnClickListtener = mShopOnClickListtener;}public interface ShopOnClickListtener {void add(View view, int position);void remove(View view, int position);}
}
在Activity中简单的添加数据
package com.qianmo.beziershopcart;import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Point;
import android.graphics.PointF;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.AccelerateInterpolator;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;import java.util.ArrayList;
import java.util.List;public class MainActivity extends AppCompatActivity implements MyAdapter.ShopOnClickListtener {private Context mContext = MainActivity.this;private RelativeLayout main_layout;private RecyclerView mRecyclerView;private ImageView mImageViewShopCat;private List<ShopBean> datas;private MyAdapter myAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {mRecyclerView = (RecyclerView) findViewById(R.id.recycler);mImageViewShopCat = (ImageView) findViewById(R.id.shopping_cart);main_layout = (RelativeLayout) findViewById(R.id.main_layout);initData();}private void initData() {datas = new ArrayList<>();datas.add(new ShopBean("面包", "1.00", 10));datas.add(new ShopBean("蛋挞", "1.00", 10));datas.add(new ShopBean("牛奶", "1.00", 10));datas.add(new ShopBean("肠粉", "1.00", 10));datas.add(new ShopBean("绿茶饼", "1.00", 10));datas.add(new ShopBean("花卷", "1.00", 10));datas.add(new ShopBean("包子", "1.00", 10));datas.add(new ShopBean("粥", "1.00", 10));datas.add(new ShopBean("炒饭", "1.00", 10));datas.add(new ShopBean("炒米粉", "1.00", 10));datas.add(new ShopBean("炒粿条", "1.00", 10));datas.add(new ShopBean("炒牛河", "1.00", 10));datas.add(new ShopBean("炒菜", "1.00", 10));datas.add(new ShopBean("淋菜", "1.00", 10));datas.add(new ShopBean("川菜", "1.00", 10));datas.add(new ShopBean("湘菜", "1.00", 10));datas.add(new ShopBean("粤菜", "1.00", 10));datas.add(new ShopBean("赣菜", "1.00", 10));datas.add(new ShopBean("东北菜", "1.00", 10));datas.add(new ShopBean("淋菜", "1.00", 10));datas.add(new ShopBean("川菜", "1.00", 10));datas.add(new ShopBean("湘菜", "1.00", 10));datas.add(new ShopBean("粤菜", "1.00", 10));datas.add(new ShopBean("赣菜", "1.00", 10));datas.add(new ShopBean("东北菜", "1.00", 10));mRecyclerView.setLayoutManager(new LinearLayoutManager(mContext));mRecyclerView.addItemDecoration(new RecyclerViewDivider(mContext, LinearLayoutManager.VERTICAL, 50, ContextCompat.getColor(mContext, R.color.colorAccent)));myAdapter = new MyAdapter(datas, mContext);mRecyclerView.setAdapter(myAdapter);myAdapter.setShopOnClickListtener(this);}@Overridepublic void add(final View view, int position) {Toast.makeText(mContext, "加", Toast.LENGTH_SHORT).show();}@Overridepublic void remove(View view, int position) {Toast.makeText(mContext, "减", Toast.LENGTH_SHORT).show();}
}
看一下我们的效果：
OK，大致的展示效果基本上是实现了
- 使用加入购物车效果
下面我们来实现贝塞尔曲线效果，首先获取两个数据点：一个是每次点击“+”号的坐标位置、一个是下面红色的购物车图标。控制点我打算取开始点的Y坐标和结束点的X坐标，那么怎么获取当前控件相对于整个屏幕的坐标呢，这里View里面有一个getLocationInWindow（）方法（这里要留心一下这个方法），然后不了解的同学可以搜索一下view.getLocationInWindow（int[] location）和view.getLocationOnScreen(int[] location)，方法的区别，这里我从网上偷了了一个图，如下：
getLocationInWindow是以B为原点的C的坐标getLocationOnScreen以A为原点
ok，这样我们看一下我们的贝塞尔三个坐标的初始化
@Overridepublic void add(final View view, int position) {//贝塞尔起始数据点int[] startPosition = new int[2];//贝塞尔结束数据点int[] endPosition = new int[2];//控制点int[] recyclerPosition = new int[2];view.getLocationInWindow(startPosition);mImageViewShopCat.getLocationInWindow(endPosition);PointF startF = new PointF();PointF endF = new PointF();PointF controllF = new PointF();startF.x = startPosition[0];startF.y = startPosition[1] ;endF.x = endPosition[0];endF.y = endPosition[1];controllF.y = startF.y;
}
继续，自定义差值器，我们按照贝塞尔的三阶公式来套，上一篇详细的介绍过了就不在废话了，这里不懂的话建议你去看一下我的上一篇博客，里面有详细的介绍
package com.qianmo.beziershopcart;import android.animation.TypeEvaluator;
import android.graphics.PointF;/*** Created by Administrator on 2017/4/10 0010.* E-Mail：543441727@qq.com*/public class BezierTypeEvaluator implements TypeEvaluator<PointF> {private PointF mControllPoint;public BezierTypeEvaluator(PointF mControllPoint) {this.mControllPoint = mControllPoint;}@Overridepublic PointF evaluate(float fraction, PointF startValue, PointF endValue) {PointF pointCur = new PointF();pointCur.x = (1 - fraction) * (1 - fraction) * startValue.x + 2 * fraction * (1 - fraction) * mControllPoint.x + fraction * fraction * endValue.x;pointCur.y = (1 - fraction) * (1 - fraction) * startValue.y + 2 * fraction * (1 - fraction) * mControllPoint.y + fraction * fraction * endValue.y;return pointCur;}
}
开启动画自动调用
@Overridepublic void add(final View view, int position) {//贝塞尔起始数据点int[] startPosition = new int[2];//贝塞尔结束数据点int[] endPosition = new int[2];view.getLocationInWindow(startPosition);mImageViewShopCat.getLocationInWindow(endPosition);PointF startF = new PointF();PointF endF = new PointF();PointF controllF = new PointF();startF.x = startPosition[0];startF.y = startPosition[1] ;endF.x = endPosition[0];endF.y = endPosition[1];controllF.x = endF.x;controllF.y = startF.y;ValueAnimator valueAnimator = ValueAnimator.ofObject(new BezierTypeEvaluator(controllF), startF, endF);valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {PointF pointF = (PointF) animation.getAnimatedValue();view.setX(pointF.x);view.setY(pointF.y);
// Log.i("wangjtiao", "viewF:" + view.getX() + "," + view.getY());}});valueAnimator .setDuration(800);valueAnimator .start();}
按照我们的思路，这个功能基本上是实现了，感觉很简单，又可以多了些时间去打两把王者农药了，看一下我们的效果图：
呃！！！我的动画呢？？？ ，看一下我们打印动画轨迹的效果
04-10 03:55:37.271 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:899.42816,608.6747
04-10 03:55:37.306 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:841.05066,615.05853
04-10 03:55:37.369 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:700.9506,644.04346
04-10 03:55:37.399 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:626.5742,669.1555
04-10 03:55:37.427 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:552.1316,703.05035
04-10 03:55:37.474 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:477.8907,747.9864
04-10 03:55:37.502 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:410.36102,801.63885
04-10 03:55:37.528 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:348.99896,864.93835
04-10 03:55:37.549 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:320.21585,901.0647
04-10 03:55:37.601 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:247.92773,1019.08307
04-10 03:55:37.629 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:210.69424,1104.1696
04-10 03:55:37.650 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:194.71275,1149.3108
04-10 03:55:37.672 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:180.81482,1194.8556
04-10 03:55:37.716 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:150.94038,1327.2924
04-10 03:55:37.744 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:138.87828,1409.5398
04-10 03:55:37.771 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:134.5641,1449.0864
04-10 03:55:37.799 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:129.06772,1518.4921
04-10 03:55:37.813 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:127.390335,1549.7286
04-10 03:55:37.852 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:125.646034,1600.0463
04-10 03:55:37.873 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:125.263214,1620.108
04-10 03:55:37.902 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:125.0176,1646.6577
04-10 03:55:37.932 29510-29510/com.qianmo.beziershopcart I/wangjtiao: viewF:125.0,1656.0
view的坐标一直在改变啊！思路上没什么问题啊，想了好久，会不会是因为这是RecyclerView的item的ImageView，是不是它不能超过它父控件的距离呢？（到最后我也没搞懂为什么不显示view，如果知道的同学请告知一下），姑且算是这个问题，那我们就每次都new一个ImageView，添加到主布局中，代码如下：
@Overridepublic void add(final View view, int position) {//贝塞尔起始数据点int[] startPosition = new int[2];//贝塞尔结束数据点int[] endPosition = new int[2];//控制点int[] recyclerPosition = new int[2];view.getLocationInWindow(startPosition);mImageViewShopCat.getLocationInWindow(endPosition);mRecyclerView.getLocationInWindow(recyclerPosition);PointF startF = new PointF();PointF endF = new PointF();PointF controllF = new PointF();startF.x = startPosition[0];startF.y = startPosition[1];endF.x = endPosition[0];endF.y = endPosition[1];controllF.x = endF.x;controllF.y = startF.y;Log.i("wangjtiao", "startF:" + startF.x + "," + startF.y);Log.i("wangjtiao", "endF:" + endF.x + "," + endF.y);Log.i("wangjtiao", "ControllF:" + endF.x + "," + controllF.y);Log.i("wangjtiao", "ControllF:" + recyclerPosition[0] + "," + recyclerPosition[1]);final ImageView imageView = new ImageView(this);main_layout.addView(imageView);imageView.setImageResource(R.mipmap.ic_add_circle_blue_700_36dp);imageView.getLayoutParams().width = getResources().getDimensionPixelSize(R.dimen.item_dish_circle_size);imageView.getLayoutParams().height = getResources().getDimensionPixelSize(R.dimen.item_dish_circle_size);imageView.setVisibility(View.VISIBLE);imageView.setX(startF.x);imageView.setY(startF.y);ValueAnimator valueAnimator = ValueAnimator.ofObject(new BezierTypeEvaluator(controllF), startF, endF);valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {PointF pointF = (PointF) animation.getAnimatedValue();imageView.setX(pointF.x);imageView.setY(pointF.y);Log.i("wangjtiao", "viewF:" + view.getX() + "," + view.getY());}});valueAnimator.setDuration(800);valueAnimator.start();}
效果如下：
？？这又是什么鬼，两个控制点出问题了？？既然控制点出问题了我们来看看我们控制点怎么得到的：view.getLocationInWindow（int[] location）和view.getLocationOnScreen(int[] location)，，感觉也没什么问题啊 我们打印一下我们的贝塞尔两个数据点和一个控制点
04-10 02:45:33.179 32056-32056/com.qianmo.beziershopcart I/wangjtiao: startF:1014.0,242.0
04-10 02:45:33.183 32056-32056/com.qianmo.beziershopcart I/wangjtiao: endF:125.0,1656.0
04-10 02:45:33.183 32056-32056/com.qianmo.beziershopcart I/wangjtiao: ControllF:125.0,242.0
ok，这里我们看不到我们的效果，我们将view.getLocationInWindow（int[] location）替换成view.getLocationOnScreen(int[] location)
04-10 02:40:44.161 27735-27735/com.qianmo.beziershopcart I/wangjtiao: startF:1014.0,242.0
04-10 02:40:44.161 27735-27735/com.qianmo.beziershopcart I/wangjtiao: endF:125.0,1656.0
04-10 02:45:33.183 32056-32056/com.qianmo.beziershopcart I/wangjtiao: ControllF:125.0,242.0
？？？为什么两次获取的坐标都是一样的，还有我们的上面动画为什么会偏差这个多，感觉这个高度貌似是我们的状态栏和标题栏的高度啊 ，为了验证我们的猜想，我们隐藏掉状态栏和标题栏试试
1 //获取当前窗体
2 final Window window = getWindow();
3 //隐藏状态栏
4 window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
5 //隐藏标题栏
6 requestWindowFeature(Window.FEATURE_NO_TITLE);
效果如下：
效果实现了，没问题，说明真的是这个问题，那view.getLocationInWindow（int[] location）按照别人博客里面说的就是取的相对坐标啊，我们获取一下我们主界面的mRecyclerView的坐标看看
04-10 02:45:33.183 32056-32056/com.qianmo.beziershopcart I/wangjtiao: ControllF:0,210
可以看到我们的标题栏+状态栏高度是210，但是我们起始点的坐标是（1014,242）这个有问题啊，应该是（1014,32）这样我们的动画才会在正确的起始位置和结束位置啊。带着我们的疑问，查了半天资料，终于在一个论坛发现了
因为你的代码显示的界面 contentView < window = screen
为什么会相等呢，因为此时的Window就是包含状态栏+contentView的大小
不是你认为的 contentView = window < screen
除非你的view是从dialog 或者 popupWindow 上显示，
这时候getLocationInWindow获得的值就是相对的坐标。
所以getLocationInWindow方法获取的是状态栏+contentView的大小，而不是我们以为的contentView的大小，知道了这里我们基本上就知道怎么解决这个问题了，只需要减去这个高度就可以了，我们可以直接减去mRecyclerView的Y坐标即可，代码如下：
@Overridepublic void add(final View view, int position) {//贝塞尔起始数据点int[] startPosition = new int[2];//贝塞尔结束数据点int[] endPosition = new int[2];//控制点int[] recyclerPosition = new int[2];view.getLocationInWindow(startPosition);mImageViewShopCat.getLocationInWindow(endPosition);mRecyclerView.getLocationInWindow(recyclerPosition);PointF startF = new PointF();PointF endF = new PointF();PointF controllF = new PointF();startF.x = startPosition[0];startF.y = startPosition[1] - recyclerPosition[1];endF.x = endPosition[0];endF.y = endPosition[1] - recyclerPosition[1];controllF.x = endF.x;controllF.y = startF.y;final ImageView imageView = new ImageView(this);main_layout.addView(imageView);imageView.setImageResource(R.mipmap.ic_add_circle_blue_700_36dp);imageView.getLayoutParams().width = getResources().getDimensionPixelSize(R.dimen.item_dish_circle_size);imageView.getLayoutParams().height = getResources().getDimensionPixelSize(R.dimen.item_dish_circle_size);imageView.setVisibility(View.VISIBLE);imageView.setX(startF.x);imageView.setY(startF.y);ValueAnimator valueAnimator = ValueAnimator.ofObject(new BezierTypeEvaluator(controllF), startF, endF);valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {PointF pointF = (PointF) animation.getAnimatedValue();imageView.setX(pointF.x);imageView.setY(pointF.y);Log.i("wangjtiao", "viewF:" + view.getX() + "," + view.getY());}});valueAnimator.setDuration(800);valueAnimator.start();}
看一下效果：
没问题了，这里的位置也没什么问题，再添加动画完成监听，移除刚刚new的ImageView
valueAnimator.addListener(new Animator.AnimatorListener() {@Overridepublic void onAnimationStart(Animator animation) {}@Overridepublic void onAnimationEnd(Animator animation) {imageView.setVisibility(View.GONE);main_layout.removeView(imageView);}@Overridepublic void onAnimationCancel(Animator animation) {}@Overridepublic void onAnimationRepeat(Animator animation) {}});
- 购物车图标从缩小到放大的实现
这个就很简单了，就是一个简单的属性动画，然后将上面这几个动画放在集合中，代码如下：
@Overridepublic void add(final View view, int position) {//贝塞尔起始数据点int[] startPosition = new int[2];//贝塞尔结束数据点int[] endPosition = new int[2];//控制点int[] recyclerPosition = new int[2];view.getLocationInWindow(startPosition);mImageViewShopCat.getLocationInWindow(endPosition);mRecyclerView.getLocationInWindow(recyclerPosition);PointF startF = new PointF();PointF endF = new PointF();PointF controllF = new PointF();startF.x = startPosition[0];startF.y = startPosition[1] - recyclerPosition[1];endF.x = endPosition[0];endF.y = endPosition[1] - recyclerPosition[1];controllF.x = endF.x;controllF.y = startF.y;final ImageView imageView = new ImageView(this);main_layout.addView(imageView);imageView.setImageResource(R.mipmap.ic_add_circle_blue_700_36dp);imageView.getLayoutParams().width = getResources().getDimensionPixelSize(R.dimen.item_dish_circle_size);imageView.getLayoutParams().height = getResources().getDimensionPixelSize(R.dimen.item_dish_circle_size);imageView.setVisibility(View.VISIBLE);imageView.setX(startF.x);imageView.setY(startF.y);ValueAnimator valueAnimator = ValueAnimator.ofObject(new BezierTypeEvaluator(controllF), startF, endF);valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {PointF pointF = (PointF) animation.getAnimatedValue();imageView.setX(pointF.x);imageView.setY(pointF.y);Log.i("wangjtiao", "viewF:" + view.getX() + "," + view.getY());}});ObjectAnimator objectAnimatorX = new ObjectAnimator().ofFloat(mImageViewShopCat, "scaleX", 0.6f, 1.0f);ObjectAnimator objectAnimatorY = new ObjectAnimator().ofFloat(mImageViewShopCat, "scaleY", 0.6f, 1.0f);objectAnimatorX.setInterpolator(new AccelerateInterpolator());objectAnimatorY.setInterpolator(new AccelerateInterpolator());AnimatorSet set = new AnimatorSet();set.play(objectAnimatorX).with(objectAnimatorY).after(valueAnimator);set.setDuration(800);set.start();}
最后的效果：
ok，这样就实现了我们的效果了，有没有很简单，二阶且三个点都是固定的贝塞尔还是很简单的嘛，github代码下载
但是这里还有个遗留的问题还是没搞懂，为什么RecyclerView的item的ImageView的动画效果不显示！！！！知道的同学请留言或者私信一下，感激（抱拳）了各位。。。