一.效果图

二.布局文件

activity_main.xml布局中

left_item.xml布局中

在right_item.xml布局中

在rigth_item_child.xml

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 Listresult) {

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 Listresult) {

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{

private Context mcontext;

private Listlist = new ArrayList<>();

public LeftAdapter(Context mcontext) {

this.mcontext = mcontext;

}

public void setList(Listresult) {

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{

private Context mcontext;

private ListlistChild;

public RightChildAdapter(Context mcontext, ListlistChild) {

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{

private Context mcontext;

private Listlist = new ArrayList<>();

public RightAdapter(Context mcontext) {

this.mcontext = mcontext;

}

public void setList(Listresult) {

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

Listlistchild = 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);

}

}

}