最近在公司比较闲,中午点外卖的时候突然发现订餐页面还可以，正好没事情做~ 于是准备仿照（饿了么）写一个~ 

下面上效果图

1、滑动联动的效果

2、订餐效果

恩，大致功能都完成了~

下面开始上代码

 

一、布局

布局比较简单，左右各一个ListView，这里我用到一个开源项目 PinnedHeaderListView

https://github.com/JimiSmith/PinnedHeaderListView 

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rel_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.Toolbar xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:layout_alignParentTop="true"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/toolbar"
        android:orientation="horizontal"
        android:paddingBottom="48dp">

        <ListView
            android:id="@+id/my_listview"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="@color/gray002"
            android:scrollbars="none" />

        <com.lly.order.view.PinnedHeaderListView
            android:id="@+id/pinnedListView"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="3"
            android:background="@android:color/white" />
    </LinearLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:layout_alignParentBottom="true"
        android:background="#4E4E4E">

        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="32dp"
            android:layout_height="32dp"
            android:layout_centerVertical="true"
            android:layout_marginLeft="8dp"
            android:src="@mipmap/icon_cart" />

        <TextView
            android:id="@+id/tv_nm"
            android:layout_width="16dp"
            android:layout_height="16dp"
            android:layout_alignTop="@+id/imageView2"
            android:layout_toLeftOf="@+id/textView4"
            android:layout_toStartOf="@+id/textView4"
            android:background="@mipmap/cemara_bg_timer_red"
            android:gravity="center"
            android:text=""
            android:textColor="@color/white"
            android:textSize="12sp"
            android:visibility="gone" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="16dp"
            android:layout_toRightOf="@+id/imageView2"
            android:text="¥0"
            android:textColor="@color/white"
            android:textSize="21sp" />


        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="8dp"
            android:text="¥30起送"
            android:textColor="@color/gray006"
            android:textSize="18sp" />
    </RelativeLayout>

</RelativeLayout>

 

然后填充数据~ 我这里用的假数据，创建一个实体

package com.lly.order.entity;

import java.util.List;

public class FoodEntity {

    private List<category> categoryList;

    public List<category> getCategoryList() {
        return categoryList;
    }

    public void setCategoryList(List<category> categoryList) {
        this.categoryList = categoryList;
    }


    public static class category {
        private String name;
        private List<foodbean> foodbeans;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public List<foodbean> getFoodbeans() {
            return foodbeans;
        }

        public void setFoodbeans(List<foodbean> foodbeans) {
            this.foodbeans = foodbeans;
        }


        public static class foodbean {
            private String dishes;
            private int count;

            public int getCount() {
                return count;
            }

            public void setCount(int count) {
                this.count = count;
            }

            public String getDishes() {
                return dishes;
            }

            public void setDishes(String dishes) {
                this.dishes = dishes;
            }
        }
    }

}

添加数据

 

//获取数据
    private void getData() {
        List<FoodEntity.category.foodbean> foodbeanList;
        int num = 0;
        for (int i = 0; i < 8; i++) { //三种类型
            num++;
            FoodEntity.category category = new FoodEntity.category();
            category.setName("类型" + i);
            foodbeanList = new ArrayList<>();
            int random = new Random().nextInt(6) + 3;//随机
            for (int j = 0; j < random; j++) {
                num++;
                FoodEntity.category.foodbean foodbean = new FoodEntity.category.foodbean();
                foodbean.setDishes("鲍鱼" + j);
                foodbeanList.add(foodbean);
            }
            category.setFoodbeans(foodbeanList);
            categories.add(category);
            location.put(i, num);
        }
    }

 

 

然后就是setAdapter啥的，具体不贴代码了，这里说一下怎么联动的
首先 监听pinnedHeaderListView的滑动事件 setOnScrollListener

 

 pinnedHeaderListView.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {

            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                int section = testSectionedAdapter.getSectionForPosition(firstVisibleItem);//获取当前的head
                if (mSection != section) {
                    mCateGoryAdapter.setIndex(section);
                    mSection = section;
                }
            }
        });

    }

首先获取head的位置，然后传入分类的Adapter

  /**
     * 设置当前的位置
     *
     * @param mIndex
     */
    public void setIndex(int mIndex) {
        this.mIndex = mIndex;
        notifyDataSetChanged();
    }

在getView方法中判断

 

  if (position == mIndex) {
            convertView.setBackgroundColor(mContext.getResources().getColor(R.color.white));
        } else {
            convertView.setBackgroundColor(mContext.getResources().getColor(R.color.gray002));
        }

 

   就可以滑动的时候，左边列表更新了

 

        //点击事件
        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                if (position == 0) {
                    pinnedHeaderListView.setSelection(0);
                } else {
                    pinnedHeaderListView.setSelection(location.get(position - 1));

                }
                mCateGoryAdapter.setIndex(position);
            }
        });

 

       location 是一个MAP 里面保存着head的位置，在getData里面就是 i 的值

      //保存head的位置
    private HashMap<Integer, Integer> location = new HashMap<>();

 

菜品添加效果的实现的实现方式,

 

    点击添加按钮然后滑出的效果，仔细 观察其实是平移加旋转，下面帖代码

   

       PropertyValuesHolder p1 = PropertyValuesHolder.ofFloat("translationX", viewHolder.imgbtn_add.getX(), 0f);
       PropertyValuesHolder p2 = PropertyValuesHolder.ofFloat("rotation", 0, 720);
       ObjectAnimator.ofPropertyValuesHolder(viewHolder.imgbtn_cancle, p1, p2).setDuration(Duration).start();
       PropertyValuesHolder pp1 = PropertyValuesHolder.ofFloat("translationX", (viewHolder.imgbtn_add.getX() -      viewHolder.tv_number.getX()), 0f);
       PropertyValuesHolder pp2 = PropertyValuesHolder.ofFloat("rotation", 0, 360);
       ObjectAnimator ObjectAnimator1 = ObjectAnimator.ofPropertyValuesHolder(viewHolder.tv_number, pp1, pp2);
       ObjectAnimator1.setStartDelay(50);//延迟
        ObjectAnimator1.setDuration(Duration);
       ObjectAnimator1.start();

 就是把 “-” 和 数量 2个view从添加按钮的位置移动到本身的位置，且进行旋转
 

当然还有收回去的效果,就在把值换一下就行了,然后监听动画执行完毕，把按钮隐藏就行了

 

 丢到购物车效果的实现，这里我差不多花了一下午时间，才弄好.......

  开始我在ListView item里面写了一个View 然后准备移动到指定的位置（购物车）,发现移动范围只能在item里面......一想发现自己2B了,View只能在父容器里面移动

  恩，所以要在跟布局中写动画了，下面说一下实现过程

 1、获取点击item的坐标，这里是获取屏幕的绝对坐标

 

int[] location = new int[2];
viewHolder.imgbtn_add.getLocationOnScreen(location)

通过写一个接口，通过回调的方式到Activity

 

    public interface onItemClickLocation {
        public void onLocation(int x, int y);
    }

 

然后在Activity拿到坐标

 

 public void onLocation(final int x, final int y) {
        //生成一个View
        final ImageView img_view = new ImageView(this);
        img_view.setImageResource(R.mipmap.food_button_add);
        relativeLayout.addView(img_view);
        //把View的位置移动到和点击的一个位置
        img_view.setX(x);
        img_view.setY(y - 48);//-48

        // 计算位移
        float endX = imageViewX - x;
        float endY = imageViewY - y;

        //执行位移和透明度动画
        TranslateAnimation translateAnimationx = new TranslateAnimation(0, endX, 0, 0);
        translateAnimationx.setInterpolator(new LinearInterpolator());//匀速
        img_view.setAnimation(translateAnimationx);


        TranslateAnimation translateAnimationY = new TranslateAnimation(0, 0, 0, endY);
        translateAnimationY.setInterpolator(new AccelerateInterpolator());
        translateAnimationY.setStartOffset(50);
        img_view.setAnimation(translateAnimationY);

        AlphaAnimation alphaAnimation = new AlphaAnimation(1f, 0.1f);
        img_view.setAnimation(alphaAnimation);

        AnimationSet set = new AnimationSet(false);
        set.setFillAfter(false);
        set.addAnimation(translateAnimationY);
        set.addAnimation(translateAnimationx);
        set.addAnimation(alphaAnimation);
        set.setDuration(500);// 动画的执行时间
        img_view.startAnimation(set);

        set.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {

            }

            @Override
            public void onAnimationEnd(Animation animation) {
                setTextNum();
                relativeLayout.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        relativeLayout.removeView(img_view);
                    }
                }, 100);
            }

            @Override
            public void onAnimationRepeat(Animation animation) {

            }
        });
    }

 

动画执行完之后，然后remove掉View，我这里延迟是因为view可能没有立马执行完onDrawa方法，这时候remove会报错

代码量不多,理清楚思路就好了~