[移动开发]【移动应用开发】实验3Fragment

一、实验目的
熟练掌握基于Fragment的Android APP的界面实现技术。
二、实验内容
在实验2实现的APP的基础上，使用Fragment使得APP能够根据不同分辨率的设备自动呈现单屏或双屏模式。
三、实验要求
1.实现上述的基本功能要求。在此基础上，可以进一步优化界面，也可以进一步添加其他功能。
2.实验报告提交内容：
1）结合系统界面（截图）介绍APP功能；
2）核心实现代码（Java或Kotlin代码）和布局文件等。
四、APP功能
一、动态加载布局，根据分辨率调整布局。平板为双页模式，在左侧面板上显示商品列表，右侧面板上显示商品详情；手机为单页模式，先是商品列表，点进具体商品后切换活动到商品详情。
二、平板模式：最初仅显示左侧商品列表，点开具体商品后在右侧展示所对应的商品详情，此处商品图片和对应的价格仅选用了两种，点开详情后右下角会展示购物车等功能按钮，此按钮图标为动态调整的。



三、手机模式：具体实现的功能与实验二类似。

五、核心实现代码

Goods（实体类）

public class Goods {
    private int imageId;
    private double price;
    private String name;
    private String content;
    public int getImageId() {
        return imageId;}
    public void setImageId(int imageId) {
        this.imageId = imageId;}
    public double getPrice() {
        return price;}
    public void setPrice(double price) {
        this.price = price;}
    public String getName(){
        return  name;}
    public void setName(String name){
        this.name=name; }
    public  String getContent(){
        return content;}
    public void setContent(String content){
        this.content=content;}
}

Goods_content_frag.xml（商品详情界面）

<?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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#fff"
    >
    <LinearLayout
        android:id="@+id/visibility_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:visibility="invisible">
        <RelativeLayout
            android:id="@+id/header_xiangqing"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:background="#f9f4f4">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:text="商品详情页"
                android:textColor="#000"
                android:textSize="18sp" />
            <ImageView
                android:layout_width="35dp"
                android:layout_height="35dp"
                android:id="@+id/back_icons"
                android:layout_alignParentLeft="true"
                android:layout_centerVertical="true"
                android:layout_marginLeft="8dp"
                android:background="@mipmap/back_icons"
                />
        </RelativeLayout>
        <TextView
            android:id="@+id/zt"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:layout_below="@id/header_xiangqing"
            android:background="#979696" />
        <ImageView
            android:id="@+id/goods_imageID"
            android:layout_width="match_parent"
            android:layout_height="300dp"
            android:layout_below="@+id/zt" />
        <TextView
            android:id="@+id/zt2"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:layout_below="@id/goods_imageID"
            android:background="#979696" />
        <TextView
            android:id="@+id/goods_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/zt2"
            android:layout_alignParentStart="true"
            android:layout_marginLeft="8dp"
            android:layout_marginTop="9dp"
            android:textColor="#000"
            android:textSize="20sp" />
        <TextView
            android:id="@+id/goods_price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/goods_name"
            android:layout_alignParentStart="true"
            android:layout_marginLeft="8dp"
            android:layout_marginTop="9dp"
            android:textColor="#f00"
            android:textSize="22sp" />
        <TextView
            android:id="@+id/xian1"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:layout_below="@id/goods_price"
            android:layout_marginTop="8dp"
            android:background="#c7c5c5" />
        <TextView
            android:id="@+id/bai"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/xian1"
            android:layout_alignStart="@+id/goods_price"
            android:layout_marginTop="15dp"
            android:text="白条"
            tools:layout_marginLeft="7dp" />
        <TextView
            android:id="@+id/bai_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/bai"
            android:layout_alignBottom="@+id/bai"
            android:layout_marginStart="18dp"
            android:layout_marginTop="5dp"
            android:layout_toEndOf="@+id/bai"
            android:text="【白条支付】首单立减5元(优惠以登录后为准)"
            android:textColor="#000" />
        <TextView
            android:id="@+id/xian2"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:layout_below="@id/xian1"
            android:layout_marginTop="20dp"
            android:background="#c7c5c5" />
        <TextView
            android:id="@+id/ling"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/xian2"
            android:layout_marginLeft="7dp"
            android:layout_marginTop="12dp"
            android:text="商品详情" />
        <TextView
            android:id="@+id/goods_content"
            android:layout_width="400dp"
            android:layout_height="110dp"
            android:layout_below="@id/xian2"
            android:layout_marginLeft="7dp"
            android:layout_marginTop="12dp"
            android:layout_toRightOf="@id/ling"
            android:textSize="20sp" />
        <TextView
            android:id="@+id/xian3"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:layout_below="@id/goods_content"
            android:layout_marginTop="10dp"
            android:background="#c7c5c5" />
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:id="@+id/button_btn_xiangqing"
            android:background="#fff"
            android:layout_alignParentBottom="true"
            android:layout_alignParentStart="true">
            <RadioButton
                android:layout_width="70dp"
                android:layout_height="match_parent"
                android:text="购物车"
                android:button="@null"
                android:id="@+id/add_cars_icons"
                android:drawableTop="@drawable/add_cars_icons"
                android:layout_alignParentTop="true"
                android:gravity="center"
                android:textSize="11sp"
                android:layout_toStartOf="@+id/add_cars" />
            <RadioButton
                android:layout_width="70dp"
                android:layout_height="match_parent"
                android:text="关注"
                android:id="@+id/guans"
                android:button="@null"
                android:textSize="11sp"
                android:drawableTop="@drawable/guans"
                android:layout_alignParentTop="true"
                android:gravity="center"
                android:layout_toStartOf="@+id/add_cars_icons" />
            <RadioButton
                android:layout_width="70dp"
                android:layout_height="match_parent"
                android:text="店铺"
                android:id="@+id/shopbutton"
                android:textSize="11sp"
                android:button="@null"
                android:drawableTop="@drawable/shopbutton"
                android:layout_alignParentTop="true"
                android:gravity="center"
                android:layout_toStartOf="@+id/guans" />
            <RadioButton
                android:layout_width="70dp"
                android:layout_height="match_parent"
                android:text="联系卖家"
                android:id="@+id/kefus"
                android:textSize="11sp"
                android:button="@null"
                android:drawableTop="@drawable/kefus"
                android:layout_alignParentTop="true"
                android:gravity="center"
                android:layout_toStartOf="@+id/shopbutton" />
            <Button
                android:layout_width="120dp"
                android:layout_height="match_parent"
                android:id="@+id/add_cars"
                android:layout_alignParentRight="true"
                android:background="#f00"
                android:text="加入购物车"
                android:textColor="#fff"
                android:gravity="center"
                android:textSize="16sp"
                />
        </RelativeLayout>
        <TextView
            android:layout_width="match_parent"
            android:layout_height="2dp"
            android:id="@+id/kong_xiangqing"
            android:layout_above="@id/button_btn_xiangqing"
            android:background="#b9b8b8"
            />
    </LinearLayout>
</RelativeLayout>

GoodsContentFragment

public class GoodsContentFragment extends Fragment {
    private View view;
    private RadioButton addcar;
    private RadioButton shopbutton;
    private RadioButton guanzhu;
    private RadioButton kefus;
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view=inflater.inflate(R.layout.goods_content_frag,container,false);
        return view;
    }
    public void refresh(String goodsName,String goodsContent,int imageID,double price)//将商品详情显示在界面上
    {
        //绘制按钮栏
        addcar = (RadioButton) view.findViewById(R.id.add_cars_icons);
        Drawable drawableaddcar = getResources().getDrawable(R.drawable.add_cars_icons);
        drawableaddcar.setBounds(0, 0, 69, 69);//第一0是距左右边距离，第二0是距上下边距离，第三69长度,第四宽度
        addcar.setCompoundDrawables(null, drawableaddcar, null, null);//只放上面
//此处省略剩余三个按钮的布置
        
        View visibilityLayout=view.findViewById(R.id.visibility_layout);
        visibilityLayout.setVisibility(View.VISIBLE);
        ImageView goodsImage=(ImageView) view.findViewById(R.id.goods_imageID);
        TextView goodsPriceText=(TextView) view.findViewById(R.id.goods_price);
        goodsImage.setImageResource(imageID);
        goodsPriceText.setText(String.valueOf(price));
        TextView goodsNameText=(TextView) view.findViewById(R.id.goods_name);
        TextView goodsContentText=(TextView) view.findViewById(R.id.goods_content);
        goodsNameText.setText(goodsName);
        goodsContentText.setText(goodsContent);
    }
}

activity_goods_content.xml（实现单页模式下布局）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context="com.example.shoplist.GoodsContentActivity">
    <fragment
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:name="com.example.shoplist.GoodsContentFragment"
        android:id="@+id/goods_content_fragment"/>
</LinearLayout>
goods_name_frag.xml(商品列表布局)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/goods_name_recycler_view"/>
</LinearLayout>

goods_item.xml（子项布局）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <ImageView
        android:id="@+id/goods_image"
        android:layout_width="150dp"
        android:layout_height="150dp"/>
    <TextView
        android:id="@+id/goods_name"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="40dp"
        android:textSize="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/goods_price"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="30dp"
        android:textSize="20dp"
        android:textColor="#FF5809"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <TextView
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="3dp"
        android:textSize="20dp"
        android:text="￥"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

GoodsContentActivity

public class GoodsContentActivity extends AppCompatActivity {
    public static void actionStart(Context context,String goodsName, String goodsContent,int imageID,double price)
    {
        Intent intent=new Intent(context, GoodsContentActivity.class);
        intent.putExtra("goods_imageID",imageID);
        intent.putExtra("goods_price",price);
        intent.putExtra("goods_name",goodsName);
        intent.putExtra("goods_content",goodsContent);
        context.startActivity(intent);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {//通过intent获得传入的商品详情
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_goods_content);
        int imageID=getIntent().getIntExtra("goods_imageID",0);
        double price=getIntent().getDoubleExtra("goods_price",0.00);
        String goodsName=getIntent().getStringExtra("goods_name");
        String goodsContent=getIntent().getStringExtra("goods_content");
        GoodsContentFragment goodsContentFragment=(GoodsContentFragment) getSupportFragmentManager().findFragmentById(R.id.goods_content_fragment);
        goodsContentFragment.refresh(goodsName,goodsContent,imageID,price);//调用reflesh方法让数据显示
    }
}

GoodsNameFragment（展示商品列表）

public class GoodsNameFragment extends Fragment {
    private boolean isTwoPane;
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {//加载goods_name_frag布局
        View view=inflater.inflate(R.layout.goods_name_frag,container,false);
        RecyclerView newsTitleRecyclerView=(RecyclerView) view.findViewById(R.id.goods_name_recycler_view);
        LinearLayoutManager layoutManager=new LinearLayoutManager(getActivity());
        newsTitleRecyclerView.setLayoutManager(layoutManager);
        GoodsAdapter adapter=new GoodsAdapter(getGoods());
        newsTitleRecyclerView.setAdapter(adapter);

        return view;
    }
    private List<Goods> getGoods() {//初始化商城数据
        List<Goods> goodsList=new ArrayList<>();
        for(int i=1;i<=50;i++)
        {
            Goods goods=new Goods();
            if(i%2==1) {
                goods.setImageId(R.mipmap.goods1);
                goods.setPrice(10.0);
            }
            else {
                goods.setImageId(R.mipmap.goods2);
                goods.setPrice(40.0);
            }
            goods.setName("Goods"+i);
            goods.setContent(getRandomLengthContent("GoodsContent"+i+"."));
            goodsList.add(goods);
        }
        return goodsList;
    }
    private String getRandomLengthContent(String content) {//随机生成商品详情的长度
        Random random=new Random();
        int length=random.nextInt(20)+1;
        StringBuilder builder=new StringBuilder();
        for(int i=0;i<length;i++)
        {
            builder.append(content);
        }
        return builder.toString();
    }
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {//通过在活动中是否嫩找到一个id为R.id.goods_content_layout的View来判断当前模式
        super.onActivityCreated(savedInstanceState);
        if(getActivity().findViewById(R.id.goods_content_layout)!=null)
        {
            isTwoPane=true;
        }
        else
        {
            isTwoPane=false;
        }
    }

    class GoodsAdapter extends RecyclerView.Adapter<GoodsAdapter.ViewHolder> {//适配器，此处写为内部类可直接访问GoodsNameFragment变量，如isTwoPane
        private List<Goods> mGoodsList;
        class ViewHolder extends RecyclerView.ViewHolder {
            ImageView goodsImage;
            TextView goodsNameText;
            TextView goodsPriceText;
            public ViewHolder(View view) {
                super(view);
                goodsImage=(ImageView)view.findViewById(R.id.goods_image);
                goodsNameText = (TextView) view.findViewById(R.id.goods_name);
                goodsPriceText = (TextView) view.findViewById(R.id.goods_price);
            }
        }
        public GoodsAdapter(List<Goods> goodsList) {
            mGoodsList = goodsList;
        }
        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.goods_item, parent, false);
            final ViewHolder holder = new ViewHolder(view);
            view.setOnClickListener(new View.OnClickListener() {//点击事件
                @Override
                public void onClick(View v) {
                    Goods goods = mGoodsList.get(holder.getAdapterPosition());
                    if (isTwoPane) {//判断单双页模式
                        GoodsContentFragment newsContentFragment = (GoodsContentFragment) getFragmentManager().findFragmentById(R.id.goods_content_fragment);
                        newsContentFragment.refresh(goods.getName(), goods.getContent(),goods.getImageId(),goods.getPrice());
                    } else {
                        GoodsContentActivity.actionStart(getActivity(), goods.getName(), goods.getContent(),goods.getImageId(),goods.getPrice());
                    }
                }
            });
            return holder;
        }
        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {
            Goods goods = mGoodsList.get(position);
            holder.goodsImage.setImageResource(goods.getImageId());
            holder.goodsNameText.setText(goods.getName());
            holder.goodsPriceText.setText(String.valueOf(goods.getPrice()));
        }
        public int getItemCount() {
            return mGoodsList.size();
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
    tools:context="com.example.shoplist.MainActivity">
    <fragment
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/goods_name_fragment"
        android:name="com.example.shoplist.GoodsNameFragment"/>
</FrameLayout>

activity_main.xml（sw600dp）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">
    <fragment
        android:id="@+id/goods_name_fragment"
        android:name="com.example.shoplist.GoodsNameFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1.5" />
    <FrameLayout
        android:id="@+id/goods_content_layout"
        android:layout_weight="3"
        android:layout_width="0dp"
        android:layout_height="match_parent">
    <fragment
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/goods_content_fragment"
        android:name="com.example.shoplist.GoodsContentFragment"/>
    </FrameLayout>
</LinearLayout>