效果图如下：
1.activity_main.xml
class="brush:java;gutter:true;"><?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rly_bezier_curve_shopping_cart"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<FrameLayout
android:id="@+id/fly_bezier_curve_shopping_cart"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:paddingRight="30dp"
android:layout_alignParentStart="true">
<ImageView
android:id="@+id/iv_bezier_curve_shopping_cart"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_gravity="right"
android:src="@drawable/menu_shop_car_selected" />
<TextView
android:id="@+id/tv_bezier_curve_shopping_cart_count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/white"
android:background="@drawable/corner_view"
android:text="0"
android:layout_gravity="right"/>
</FrameLayout>
<ListView
android:id="@+id/lv_bezier_curve_shopping_cart"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/fly_bezier_curve_shopping_cart"/>
</RelativeLayout>
menu_shop_car_selected.png
corner_view.xml
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="@color/red" /> <corners android:radius="10dp" /> <padding android:left="5dp" android:top="1dp" android:right="5dp" android:bottom="1dp" /> </shape>
2.adapter_shopping_cart_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_marginBottom="1dp"
android:layout_height="wrap_content"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<ImageView
android:id="@+id/iv_shopping_cart_item"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_centerVertical="true"
android:src="@mipmap/ic_launcher"/>
<TextView
android:id="@+id/tv_shopping_cart_item"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="购 买"
android:textSize="16sp"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"/>
</RelativeLayout>
3.MainActivity
public class MainActivity extends AppCompatActivity { // 购物车父布局 private RelativeLayout mShoppingCartRly; // 购物车列表显示 private ListView mShoppingCartLv; // 购物数目显示 private TextView mShoppingCartCountTv; // 购物车图片显示 private ImageView mShoppingCartIv; // 购物车适配器 private GoodsAdapter mGoodsAdapter; // 数据源（购物车商品图片） private ArrayList<GoodsModel> mData; // 贝塞尔曲线中间过程点坐标 private float[] mCurrentPosition = new float[2]; // 路径测量 private PathMeasure mPathMeasure; // 购物车商品数目 private int goodsCount = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // findView mShoppingCartLv = (ListView) findViewById(R.id.lv_bezier_curve_shopping_cart); mShoppingCartCountTv = (TextView) findViewById(R.id.tv_bezier_curve_shopping_cart_count); mShoppingCartRly = (RelativeLayout) findViewById(R.id.rly_bezier_curve_shopping_cart); mShoppingCartIv = (ImageView) findViewById(R.id.iv_bezier_curve_shopping_cart); // 是否显示购物车商品数目 isShowCartGoodsCount(); // 添加数据源 addData(); // 设置适配器 setAdapter(); } private void setAdapter() { // 初始化适配器 mGoodsAdapter = new GoodsAdapter(this, mData); // 设置适配器监听 mGoodsAdapter.setCallBackListener(new GoodsAdapter.CallBackListener() { @Override public void callBackImg(ImageView goodsImg) { // 添加商品到购物车 addGoodsToCart(goodsImg); } }); // 设置适配器 mShoppingCartLv.setAdapter(mGoodsAdapter); } private void addGoodsToCart(ImageView goodsImg) { // 创造出执行动画的主题goodsImg（这个图片就是执行动画的图片,从开始位置出发,经过一个抛物线（贝塞尔曲线）,移动到购物车里） final ImageView goods = new ImageView(this); goods.setImageDrawable(goodsImg.getDrawable()); RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(100, 100); mShoppingCartRly.addView(goods, params); // 得到父布局的起始点坐标（用于辅助计算动画开始/结束时的点的坐标） int[] parentLocation = new int[2]; mShoppingCartRly.getLocationInWindow(parentLocation); // 得到商品图片的坐标（用于计算动画开始的坐标） int startLoc[] = new int[2]; goodsImg.getLocationInWindow(startLoc); // 得到购物车图片的坐标(用于计算动画结束后的坐标) int endLoc[] = new int[2]; mShoppingCartIv.getLocationInWindow(endLoc); // 开始掉落的商品的起始点：商品起始点-父布局起始点+该商品图片的一半 float startX = startLoc[0] - parentLocation[0] + goodsImg.getWidth() / 2; float startY = startLoc[1] - parentLocation[1] + goodsImg.getHeight() / 2; // 商品掉落后的终点坐标：购物车起始点-父布局起始点+购物车图片的1/5 float toX = endLoc[0] - parentLocation[0] + mShoppingCartIv.getWidth() / 5; float toY = endLoc[1] - parentLocation[1]; // 开始绘制贝塞尔曲线 Path path = new Path(); // 移动到起始点（贝塞尔曲线的起点） path.moveTo(startX, startY); // 使用二阶贝塞尔曲线：注意第一个起始坐标越大，贝塞尔曲线的横向距离就会越大，一般按照下面的式子取即可 path.quadTo((startX + toX) / 2, startY, toX, toY); // mPathMeasure用来计算贝塞尔曲线的曲线长度和贝塞尔曲线中间插值的坐标，如果是true，path会形成一个闭环 mPathMeasure = new PathMeasure(path, false); // 属性动画实现（从0到贝塞尔曲线的长度之间进行插值计算，获取中间过程的距离值） ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, mPathMeasure.getLength()); valueAnimator.setDuration(500); // 匀速线性插值器 valueAnimator.setInterpolator(new LinearInterpolator()); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { // 当插值计算进行时，获取中间的每个值， // 这里这个值是中间过程中的曲线长度（下面根据这个值来得出中间点的坐标值） float value = (Float) animation.getAnimatedValue(); // 获取当前点坐标封装到mCurrentPosition // boolean getPosTan(float distance, float[] pos, float[] tan) ： // 传入一个距离distance(0<=distance<=getLength())，然后会计算当前距离的坐标点和切线，pos会自动填充上坐标，这个方法很重要。 // mCurrentPosition此时就是中间距离点的坐标值 mPathMeasure.getPosTan(value, mCurrentPosition, null); // 移动的商品图片（动画图片）的坐标设置为该中间点的坐标 goods.setTranslationX(mCurrentPosition[0]); goods.setTranslationY(mCurrentPosition[1]); } }); // 开始执行动画 valueAnimator.start(); // 动画结束后的处理 valueAnimator.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { // 购物车商品数量加1 goodsCount ++; isShowCartGoodsCount(); mShoppingCartCountTv.setText(String.valueOf(goodsCount)); // 把执行动画的商品图片从父布局中移除 mShoppingCartRly.removeView(goods); } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } }); } private void isShowCartGoodsCount(){ if (goodsCount == 0){ mShoppingCartCountTv.setVisibility(View.GONE); }else { mShoppingCartCountTv.setVisibility(View.VISIBLE); } } private void addData() { // 初始化数据源 mData = new ArrayList<>(); // 添加数据源 GoodsModel goodsModel = new GoodsModel(); goodsModel.setmGoodsBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.goods_one)); mData.add(goodsModel); goodsModel = new GoodsModel(); goodsModel.setmGoodsBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.goods_two)); mData.add(goodsModel); goodsModel = new GoodsModel(); goodsModel.setmGoodsBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.goods_three)); mData.add(goodsModel); } }
4.GoodsAdapter
1 public class GoodsAdapter extends BaseAdapter{ 2 3 // 数据源（购物车商品图片） 4 private ArrayList<GoodsModel> mData; 5 // 布局 6 private LayoutInflater mLayoutInflater; 7 // 回调监听 8 private CallBackListener mCallBackListener; 9 10 public GoodsAdapter(Context context, ArrayList<GoodsModel> mData){ 11 mLayoutInflater = LayoutInflater.from(context); 12 this.mData = mData; 13 } 14 15 @Override 16 public int getCount() { 17 return mData != null ? mData.size(): 0; 18 } 19 20 @Override 21 public Object getItem(int i) { 22 return mData != null ? mData.get(i): null; 23 } 24 25 @Override 26 public long getItemId(int i) { 27 return i; 28 } 29 30 @Override 31 public View getView(int i, View view, ViewGroup viewGroup) { 32 ViewHolder viewHolder; 33 if (view == null){ 34 view = mLayoutInflater.inflate(R.layout.adapter_shopping_cart_item, null); 35 viewHolder = new ViewHolder(view); 36 view.setTag(viewHolder); 37 }else { 38 // 复用ViewHolder 39 viewHolder = (ViewHolder) view.getTag(); 40 } 41 42 // 更新UI 43 if (i < mData.size()) 44 viewHolder.updateUI(mData.get(i)); 45 return view; 46 } 47 48 class ViewHolder{ 49 // 显示商品图片 50 private ImageView mShoppingCartItemIv; 51 52 public ViewHolder(View view){ 53 // findView 54 mShoppingCartItemIv = (ImageView) view.findViewById(R.id.iv_shopping_cart_item); 55 // onClick 56 view.findViewById(R.id.tv_shopping_cart_item).setOnClickListener( 57 new View.OnClickListener() { 58 @Override 59 public void onClick(View view) { 60 if (mShoppingCartItemIv != null && mCallBackListener != null) 61 mCallBackListener.callBackImg(mShoppingCartItemIv); 62 } 63 }); 64 } 65 66 public void updateUI(GoodsModel goods){ 67 if (goods != null 68 && goods.getmGoodsBitmap() != null 69 && mShoppingCartItemIv != null) 70 mShoppingCartItemIv.setImageBitmap(goods.getmGoodsBitmap()); 71 } 72 } 73 74 public void setCallBackListener(CallBackListener mCallBackListener){ 75 this.mCallBackListener = mCallBackListener; 76 } 77 78 public interface CallBackListener{ 79 void callBackImg(ImageView goodsImg); 80 } 81 82 }
5.GoodsModel
public class GoodsModel {
// 商品图
private Bitmap mGoodsBitmap;
public Bitmap getmGoodsBitmap() {
return mGoodsBitmap;
}
public void setmGoodsBitmap(Bitmap mGoodsBitmap) {
this.mGoodsBitmap = mGoodsBitmap;
}
}
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