仿京东分类页面
activity_main.xml：
左侧竖向的RecyclerView条目——left_rv_item.xml：
ExpandableListView的父布局——elv_parent_item.xml：
ExpandableListView的子布局(其实就是一个RecyclerView)——elv_child_item.xml：
ExpandableListView的子布局的条目 —— elv_child_rv_item.xml：
首先是model层：
package com.example.dell.dianshang7.mvp.model;
import com.example.dell.dianshang7.OkhttpUtils;
import java.util.HashMap;
import java.util.Map;
/**
* Created by DELL on 2018/6/28.
*/
public class Model {
private OkhttpUtils instance;
public void startListView(int cid, final IModelInterface iModelInterface){
instance = OkhttpUtils.getInstance();
instance.doGet("https://www.zhaoapi.cn/product/getCatagory", new OkhttpUtils.OkCallback() {
@Override
public void onResponse(String json) {
if(iModelInterface != null){
iModelInterface.onLeftResponse(json);
}
}
@Override
public void onFailure(Exception e) {
if(iModelInterface != null){
iModelInterface.onLeftFailure(e);
}
}
});
Map map = new HashMap<>();
map.put("cid",cid+"");
instance.doPost("https://www.zhaoapi.cn/product/getProductCatagory", map, new OkhttpUtils.OkCallback() {
@Override
public void onResponse(String json) {
if(iModelInterface != null){
iModelInterface.onRightResponse(json);
}
}
@Override
public void onFailure(Exception e) {
if(iModelInterface != null){
iModelInterface.onRightFailure(e);
}
}
});
}
public interface IModelInterface{
void onLeftResponse(String json);
void onLeftFailure(Exception e);
void onRightResponse(String json);
void onRightFailure(Exception e);
}
}
presenter层：
package com.example.dell.dianshang7.mvp.presenter;
import com.example.dell.dianshang7.mvp.model.Model;
import com.example.dell.dianshang7.mvp.view.iview.IViewInterface;
/**
* Created by DELL on 2018/6/28.
*/
public class Presenter {
private Model model;
IViewInterface mIViewInterface;
public Presenter(IViewInterface iViewInterface){
mIViewInterface = iViewInterface;
model = new Model();
}
public void startListView(int cid){
model.startListView(cid, new Model.IModelInterface() {
@Override
public void onLeftResponse(String json) {
if(mIViewInterface != null){
mIViewInterface.onLeftResponse(json);
}
}
@Override
public void onLeftFailure(Exception e) {
if(mIViewInterface != null){
mIViewInterface.onLeftFailure(e);
}
}
@Override
public void onRightResponse(String json) {
if(mIViewInterface != null){
mIViewInterface.onRightResponse(json);
}
}
@Override
public void onRightFailure(Exception e) {
if(mIViewInterface != null){
mIViewInterface.onRightFailure(e);
}
}
});
}
}
view层：
package com.example.dell.dianshang7.mvp.view.iview;
/**
* Created by DELL on 2018/6/28.
*/
public interface IViewInterface {
void onLeftResponse(String json);
void onLeftFailure(Exception e);
void onRightResponse(String json);
void onRightFailure(Exception e);
}
适配器adapter：
最左边RecyclerView的适配器 —— LeftAdapter
package com.example.dell.dianshang7.adapter;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.example.dell.dianshang7.Catagory;
import com.example.dell.dianshang7.R;
import java.util.List;
/**
* Created by DELL on 2018/6/28.
*/
public class LeftAdapter extends RecyclerView.Adapter{
private Context context;
private List data;
public LeftAdapter(Context context, List data) {
this.context = context;
this.data = data;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = View.inflate(context, R.layout.left_rv_item, null);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.left_rv_tv.setText(data.get(position).getName());
if(onitemClickListener != null){
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int cid = data.get(position).getCid();
onitemClickListener.onItemClick(cid);
}
});
}
}
@Override
public int getItemCount() {
return data == null ? 0 : data.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private final TextView left_rv_tv;
public ViewHolder(View itemView) {
super(itemView);
left_rv_tv = itemView.findViewById(R.id.left_rv_tv);
}
}
//自定义条目点击事件接口
private OnitemClickListener onitemClickListener;
public void setOnitemClickListener(OnitemClickListener onitemClickListener) {
this.onitemClickListener = onitemClickListener;
}
public interface OnitemClickListener{
void onItemClick(int cid);
}
}
二级列表子条目 —— RecyclerViewAdapter
package com.example.dell.dianshang7.adapter;
import android.content.Context;
import android.graphics.Bitmap;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.dell.dianshang7.ProductCatagory;
import com.example.dell.dianshang7.R;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import java.util.List;
/**
* Created by DELL on 2018/6/28.
*/
public class RecyclerViewAdapter extends RecyclerView.Adapter{
private Context context;
private List list;
private final DisplayImageOptions options;
public RecyclerViewAdapter(Context context, List list) {
this.context = context;
this.list = list;
options = new DisplayImageOptions.Builder()
.cacheInMemory(true)//使用内存缓存
.cacheOnDisk(true)//使用磁盘缓存
.bitmapConfig(Bitmap.Config.RGB_565)//设置图片色彩模式
.imageScaleType(ImageScaleType.EXACTLY)//设置图片的缩放模式
.build();
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.elv_child_rv_item,parent,false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
ImageLoader.getInstance().displayImage(list.get(position).getIcon(),holder.img,options);
holder.text.setText(list.get(position).getName());
}
@Override
public int getItemCount() {
return list == null ? 0 : list.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private final ImageView img;
private final TextView text;
public ViewHolder(View itemView) {
super(itemView);
img = itemView.findViewById(R.id.img);
text = itemView.findViewById(R.id.text);
}
}
}
二级列表的适配器 —— ExpandableListViewAdapter
package com.example.dell.dianshang7.adapter;
import android.content.Context;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
import com.example.dell.dianshang7.ProductCatagory;
import com.example.dell.dianshang7.R;
import java.util.List;
/**
* Created by DELL on 2018/6/28.
*/
public class ExpandableListViewAdapter extends BaseExpandableListAdapter {
private Context context;
private List list;
private RecyclerViewAdapter rvadapter;
private GridLayoutManager gridLayoutManager;
public ExpandableListViewAdapter(Context context, List list) {
this.context = context;
this.list = list;
}
@Override
public int getGroupCount() {
return list == null ? 0 : list.size();
}
@Override
public int getChildrenCount(int i) {
return 1;
}
@Override
public Object getGroup(int i) {
return null;
}
@Override
public Object getChild(int i, int i1) {
return null;
}
@Override
public long getGroupId(int i) {
return 0;
}
@Override
public long getChildId(int i, int i1) {
return 0;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
ParentViewHolder parentholder = null;
if (view == null) {
view = View.inflate(context, R.layout.elv_parent_item, null);
parentholder = new ParentViewHolder();
parentholder.elv_parent_tv = (TextView) view.findViewById(R.id.elv_parent_tv);
view.setTag(parentholder);
} else {
parentholder = (ParentViewHolder) view.getTag();
}
parentholder.elv_parent_tv.setText(list.get(i).getName());
return view;
}
@Override
public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
ChildViewHolder childholder;
if (view == null) {
view = View.inflate(context, R.layout.elv_child_item, null);
childholder = new ChildViewHolder();
childholder.rvadapter1 = (RecyclerView) view.findViewById(R.id.elv_child_item_rv11);
view.setTag(childholder);
} else {
childholder = (ChildViewHolder) view.getTag();
}
List list = this.list.get(i).getList();
rvadapter = new RecyclerViewAdapter(viewGroup.getContext(), list);
gridLayoutManager = new GridLayoutManager(viewGroup.getContext(), 2);
gridLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
childholder.rvadapter1.setLayoutManager(gridLayoutManager);
childholder.rvadapter1.setAdapter(rvadapter);
return view;
}
@Override
public boolean isChildSelectable(int i, int i1) {
return false;
}
class ParentViewHolder {
public TextView elv_parent_tv;
}
class ChildViewHolder {
public RecyclerView rvadapter1;
}
}
MainActivity：
package com.example.dell.dianshang7;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.ExpandableListView;
import android.widget.Toast;
import com.example.dell.dianshang7.adapter.ExpandableListViewAdapter;
import com.example.dell.dianshang7.adapter.LeftAdapter;
import com.example.dell.dianshang7.mvp.presenter.Presenter;
import com.example.dell.dianshang7.mvp.view.iview.IViewInterface;
import com.google.gson.Gson;
import java.util.List;
public class MainActivity extends AppCompatActivity implements IViewInterface {
// private int cid = 1;
// private String url = "https://www.zhaoapi.cn/product/getProductCatagory?cid="+cid;
private RecyclerView left_rv;
private int cid = 1;
private ExpandableListView elv;
private Presenter presenter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
left_rv = findViewById(R.id.left_rv);
elv = findViewById(R.id.elv);
presenter = new Presenter(this);
presenter.startListView(cid);
}
@Override
public void onLeftResponse(String json) {
Gson gson = new Gson();
Catagory catagory = gson.fromJson(json, Catagory.class);
List data = catagory.getData();
LeftAdapter adapter = new LeftAdapter(MainActivity.this, data);
left_rv.setAdapter(adapter);
//给RecyclerView添加分割线
left_rv.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
left_rv.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
adapter.setOnitemClickListener(new LeftAdapter.OnitemClickListener() {
@Override
public void onItemClick(int cid) {
presenter.startListView(cid);
//Toast.makeText(MainActivity.this, "第" + cid + "个", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onLeftFailure(Exception e) {
}
@Override
public void onRightResponse(String json) {
Gson gson = new Gson();
ProductCatagory productCatagory = gson.fromJson(json, ProductCatagory.class);
List list = productCatagory.getData();
ExpandableListViewAdapter elvadapter = new ExpandableListViewAdapter(MainActivity.this, list);
elv.setAdapter(elvadapter);
//展开二级列表
for (int i = 0; i < list.size(); i++) {
elv.expandGroup(i);
}
}
@Override
public void onRightFailure(Exception e) {
}
}