Android仿京东商品分类

一.效果图

二.布局文件
activity_main.xml布局中

<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"
    android:orientation="horizontal"
    tools:context=".activity.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:overScrollMode="always"
        android:id="@+id/left_recycler"
        android:layout_width="100dp"
        android:layout_height="match_parent" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/right_recycler"
        android:fadingEdge="vertical"
        android:layout_marginLeft="5dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

left_item.xml布局中

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <RelativeLayout
        android:id="@+id/layout"
        android:layout_width="match_parent"
        android:layout_height="50dp">

        <TextView
            android:id="@+id/left_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="djzjfvn z" />

        <View
            android:layout_width="match_parent"
            android:layout_height="1px"
            android:background="#999999" />
    </RelativeLayout>
</LinearLayout>

在right_item.xml布局中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="5dp">

    <TextView
        android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:textSize="25sp"
        android:text="jdzhfbvzj" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycleview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/name"
        android:layout_marginTop="10dp" />
</RelativeLayout>

在rigth_item_child.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <ImageView
        android:id="@+id/image"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="szdjfhbnvzfl" />
</LinearLayout>

在MainActivity.java中

public class MainActivity extends AppCompatActivity implements ILeftview, IRightview {

    private RecyclerView left_recycler;
    private RecyclerView right_recycler;
    private LeftPresenter leftPresenter;
    private RightPresenter rightPresenter;
    private LeftAdapter leftAdapter;
    private RightAdapter rightAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控件
        init();

        leftPresenter.showLeft();
        rightPresenter.showRight(1);
    }

    private void init() {
        left_recycler = (RecyclerView) findViewById(R.id.left_recycler);
        right_recycler = (RecyclerView) findViewById(R.id.right_recycler);
        leftPresenter = new LeftPresenter(this);
        rightPresenter = new RightPresenter(this);
    }

    @Override
    public void successLf(final List<LeftBean.DataBean> result) {
        runOnUiThread(new Runnable() {

            @Override
            public void run() {
                leftAdapter = new LeftAdapter(MainActivity.this);
                //布局
                LinearLayoutManager linearLayoutManager = new LinearLayoutManager(MainActivity.this);
                linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
                left_recycler.setLayoutManager(linearLayoutManager);
                left_recycler.setAdapter(leftAdapter);

                result.get(0).setClick(true);//默认第一个选中
                leftAdapter.setList(result);

                //点击左侧实现右侧商品信息展示
                leftAdapter.setOnItemLeftClckListener(new LeftAdapter.OnItemLeftClckListener() {
                    @Override
                    public void onItemLeftClck(int position) {
                        //让左右联动起来的
                        int cid = result.get(position).getCid();
                        rightPresenter.showRight(cid);

                        //当点击时显示当前条目的背景和文字的颜色
                        for (int i = 0; i < result.size(); i++) {
                            if (position == i) {
                                result.get(i).setClick(true);

                            } else {
                                result.get(i).setClick(false);
                            }
                        }
                        //更新视图(必须有)
                        leftAdapter.notifyDataSetChanged();
                    }
                });
            }
        });
    }

    @Override
    public void failerLf(String msg) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(MainActivity.this, "获取失败", Toast.LENGTH_SHORT).show();
            }
        });
    }


    @Override
    public void successRh(final List<RightBean.DataBean> result) {
        runOnUiThread(new Runnable() {

            @Override
            public void run() {
                rightAdapter = new RightAdapter(MainActivity.this);
                //布局
                LinearLayoutManager linearLayoutManager = new LinearLayoutManager(MainActivity.this);
                linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
                right_recycler.setLayoutManager(linearLayoutManager);
                right_recycler.setAdapter(rightAdapter);
                rightAdapter.setList(result);
            }
        });
    }

    @Override
    public void failerRh(String msg) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(MainActivity.this, "获取失败", Toast.LENGTH_SHORT).show();
            }
        });

    }
}

在LeftAdapter中

public class LeftAdapter extends RecyclerView.Adapter<LeftAdapter.MyViewHolder> {
    private Context mcontext;
    private List<LeftBean.DataBean> list = new ArrayList<>();
    public LeftAdapter(Context mcontext) {
        this.mcontext = mcontext;
    }

    public void setList(List<LeftBean.DataBean> result) {
        this.list = result;
        notifyDataSetChanged();
    }

    @Override
    public LeftAdapter.MyViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(mcontext).inflate(R.layout.left_item, viewGroup, false);
        return new MyViewHolder(view);
    }


    @Override
    public void onBindViewHolder(LeftAdapter.MyViewHolder myViewHolder, final int position) {
        myViewHolder.left_name.setText(list.get(position).getName());


        //判断点击与不点击的背景
        if (list.get(position).isClick()) {
            myViewHolder.mlayout.setBackgroundColor(Color.parseColor("#d43c3c"));
            myViewHolder.left_name.setTextColor(Color.parseColor("#FFFFFF"));
        } else {
            myViewHolder.mlayout.setBackgroundColor(Color.parseColor("#FFFFFF"));
            myViewHolder.left_name.setTextColor(Color.parseColor("#222222"));
        }
    }

    @Override
    public int getItemCount() {
        return list.size();
    }


    class MyViewHolder extends RecyclerView.ViewHolder {

        private final RelativeLayout mlayout;
        private final TextView left_name;

        public MyViewHolder(View itemView) {
            super(itemView);
            mlayout = itemView.findViewById(R.id.layout);
            left_name = itemView.findViewById(R.id.left_name);

            //点击条目
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onItemLeftClckListener.onItemLeftClck(getLayoutPosition());
                }
            });
        }
    }

    //接口回调
    public interface OnItemLeftClckListener {
        void onItemLeftClck(int position);
    }

    private OnItemLeftClckListener onItemLeftClckListener;

    public void setOnItemLeftClckListener(OnItemLeftClckListener onItemLeftClckListener) {
        this.onItemLeftClckListener = onItemLeftClckListener;
    }
}

在RightChildAdapter中

public class RightChildAdapter extends RecyclerView.Adapter<RightChildAdapter.MyViewHolder> {

    private Context mcontext;
    private List<RightBean.DataBean.ListBean> listChild;

    public RightChildAdapter(Context mcontext, List<RightBean.DataBean.ListBean> listChild) {
        this.mcontext = mcontext;
        this.listChild = listChild;
    }

    @NonNull
    @Override
    public RightChildAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(mcontext).inflate(R.layout.rigth_item_child, viewGroup, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RightChildAdapter.MyViewHolder myViewHolder, int i) {
        myViewHolder.mtitle.setText(listChild.get(i).getName());
        Picasso.with(mcontext).load(listChild.get(i).getIcon()).into(myViewHolder.mIamge);
    }

    @Override
    public int getItemCount() {
        return listChild.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView mtitle;
        ImageView mIamge;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            mIamge = (ImageView) itemView.findViewById(R.id.image);
            mtitle = (TextView) itemView.findViewById(R.id.title);
        }
    }
}

在RightAdapter

public class RightAdapter extends RecyclerView.Adapter<RightAdapter.MyViewHolder> {
    private Context mcontext;
    private List<RightBean.DataBean> list = new ArrayList<>();

    public RightAdapter(Context mcontext) {
        this.mcontext = mcontext;
    }

    public void setList(List<RightBean.DataBean> result) {
        this.list=result;
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public RightAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(mcontext).inflate(R.layout.right_item, viewGroup, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RightAdapter.MyViewHolder myViewHolder, int i) {
        myViewHolder.mname.setText(list.get(i).getName());
        //写下面recycler视图
        List<RightBean.DataBean.ListBean> listchild = this.list.get(i).getList();
        RightChildAdapter rightChildAdapter = new RightChildAdapter(mcontext, listchild);
        GridLayoutManager gridLayoutManager = new GridLayoutManager(mcontext, 3);
        myViewHolder.mRecyclerView.setLayoutManager(gridLayoutManager);
        myViewHolder.mRecyclerView.setAdapter(rightChildAdapter);
    }

    @Override
    public int getItemCount() {
        return list.size();
    }


    class MyViewHolder extends RecyclerView.ViewHolder {
        RecyclerView mRecyclerView;
        TextView mname;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            mname = (TextView) itemView.findViewById(R.id.name);
            mRecyclerView = (RecyclerView) itemView.findViewById(R.id.recycleview);
        }
    }
}