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"?>
<RelativeLayout
xmlns: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.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
<LinearLayout
android: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>
<FrameLayout
android: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">
<ImageView
android: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;
}
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new ViewHolder(LayoutInflater.from(mContext).inflate(R.layout.item_shop_menu, parent, false));
}
@Override
public 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() {
@Override
public void onClick(View v) {
if (mShopOnClickListtener != null) {
mShopOnClickListtener.add(v, position);
}
}
});
holder.ic_reduce.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mShopOnClickListtener != null) {
mShopOnClickListtener.remove(v, position);
}
}
});
}
@Override
public 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;
@Override
protected 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);
}
@Override
public void add(final View view, int position) {
Toast.makeText(mContext, "加", Toast.LENGTH_SHORT).show();
}
@Override
public 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
@Override
public 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;
}
@Override
public 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
@Override
public 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() {
@Override
public 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：
@Override
public 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() {
@Override
public 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：
@Override
public 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() {
@Override
public 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() {
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
imageView.setVisibility(View.GONE);
main_layout.removeView(imageView);
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public 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：
@Override
public 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() {
@Override
public 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。。。