仿京东分类实现

   首先我这一块我用的是MVP模式写的这个分类，简单说一下它的布局，就两块，左面一块就是RecyclerView，右面一块是二级列表嵌套RecyclerView，请求的时候

我用的Retrofit+Rxjava+OkHttp的结合请求的数据，废话不多说

直接甩代码，代码有点多，慢慢看。

   先展示一下效果

  

首先看一下接口

1. public interface Inters {
2. /**
3. * 左面接口
4. */
5. @GET("product/getCatagory")
6. Observable<Zean> Zuo();
7. /**
8. * 右面接口
9. */
10. @GET("product/getProductCatagory")
11. Observable<Yean> You(@Query("cid") int cid);
12. }

Retrofit+Rxjava+OkHttp的结合

1. import okhttp3.OkHttpClient;
2. import retrofit2.Retrofit;
3. import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
4. import retrofit2.converter.gson.GsonConverterFactory;
5. /**
6. * Retrofit+Rxjava+OkHttp封装，单例
7. */
8. public class RetrofitUnitl {
9. private Retrofit mRetrofit;
10. private String baseUrl;
11. OkHttpClient client;
12. private static RetrofitUnitl mRetrofitManager;
13. private RetrofitUnitl(String baseUrl,OkHttpClient client){
14. this.baseUrl=baseUrl;
15. this.client=client;
16. initRetrofit();
17. }
18. public static synchronized RetrofitUnitl getInstance(String baseUrl,OkHttpClient client){
19. if (mRetrofitManager == null){
20. mRetrofitManager = new RetrofitUnitl(baseUrl,client);
21. }
22. return mRetrofitManager;
23. }
24. private void initRetrofit() {
25. mRetrofit = new Retrofit.Builder()
26. .baseUrl(baseUrl)
27. .addConverterFactory(GsonConverterFactory.create())
28. .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
29. .client(client)
30. .build();
31. }
32. public <T> T setCreate(Class<T> reqServer) {
33. return mRetrofit.create(reqServer);
34. }
35. }

 分类的布局

1. <LinearLayout
2. xmlns:android="http://schemas.android.com/apk/res/android"
3. xmlns:tools="http://schemas.android.com/tools"
4. android:layout_width="match_parent"
5. android:layout_height="match_parent"
6. android:orientation="horizontal"
7. tools:context="com.xjq.xinjiaqi20171208.MainActivity">
8.  
9. <android.support.v7.widget.RecyclerView
10. android:id="@+id/zrv"
11. android:layout_width="130dp"
12. android:layout_height="match_parent" />
13.  
14.  <ExpandableListView
15. android:id="@+id/yev"
16. android:layout_width="match_parent"
17. android:layout_height="match_parent"></ExpandableListView>
18.  
19. </LinearLayout>

左侧bean包 和右侧的bean包我就不写了。

下面开始MVP，首先是V层

1. public interface IFenView {
2. void onZuo(Zean zean);//左侧请求成功
3. void onYou(Yean yean);//右侧请求成功
4. }

M层

1. public class FenModel {
2.  
3. ScuMod scuMod;
4.  
5. public void setScuMod(ScuMod scuMod) {
6. this.scuMod = scuMod;
7. }
8.  
9. //左面请求
10. public void ZuoChen(){
11. //OkHttp里面可以添加拦截器
12. OkHttpClient ok = new OkHttpClient.Builder()
13. .build();
14. //请求数据
15. RetrofitUnitl.getInstance("https://www.zhaoapi.cn/",ok)
16. .setCreate(Inters.class)
17. .Zuo()
18. .observeOn(AndroidSchedulers.mainThread())
19. .subscribeOn(Schedulers.io())
20. .subscribe(new Subscriber<Zean>() {
21. @Override
22. public void onCompleted() {
23.  
24. }
25.  
26. @Override
27. public void onError(Throwable e) {
28.  
29. }
30.  
31. @Override
32. public void onNext(Zean bean) {
33. scuMod.Zc(bean);
34. }
35. });
36. }
37.  
38. //右面请求
39. public void YuoChen(int cont){
40. //OkHttp里面可以添加拦截器
41. OkHttpClient ok = new OkHttpClient.Builder()
42. .build();
43. //请求数据
44. RetrofitUnitl.getInstance("https://www.zhaoapi.cn/",ok)
45. .setCreate(Inters.class)
46. .You(cont)
47. .observeOn(AndroidSchedulers.mainThread())
48. .subscribeOn(Schedulers.io())
49. .subscribe(new Subscriber<Yean>() {
50. @Override
51. public void onCompleted() {
52.  
53. }
54.  
55. @Override
56. public void onError(Throwable e) {
57.  
58. }
59.  
60. @Override
61. public void onNext(Yean bean) {
62. scuMod.Yc(bean);
63. }
64. });
65. }
66. //定义一个接口
67. public interface ScuMod{
68. void Zc(Zean bean);
69. void Yc(Yean yean);
70. }
71. }

P层

1. //实现M层的接口
2. public class FenPresenter implements FenModel.ScuMod {
3.  
4. IFenView view;
5. FenModel model;
6.  
7. public FenPresenter(IFenView view) {
8. this.view = view;
9. model = new FenModel();
10. model.setScuMod(this);
11. }
12.  
13. @Override
14. public void Zc(Zean bean) {
15. view.onZuo(bean);
16. }
17.  
18. @Override
19. public void Yc(Yean yean) {
20. view.onYou(yean);
21. }
22.  
23. //左侧调用
24. public void ShowPer(){
25. model.ZuoChen();
26. }
27. // 右侧调用
28. public void FlShowYou(int cont){
29. model.YuoChen(cont);
30. }
31. }

我们在主方法里面一定要实现V层

1. public class MainActivity extends AppCompatActivity implements IFenView{
2.  
3. public ExpandableListView yev;
4. public RecyclerView zrv;
5. public FenPresenter presenter;
6.  
7. @Override
8. protected void onCreate(Bundle savedInstanceState) {
9. super.onCreate(savedInstanceState);
10. setContentView(R.layout.activity_main);
11. //拿到P层
12. presenter = new FenPresenter(this);
13. presenter.ShowPer();
14. //默认展示第一条
15.  presenter.FlShowYou(1);
16. //找控件
17. zrv = findViewById(R.id.zrv);
18. yev = findViewById(R.id.yev);
19. }
20.  
21. @Override
22. public void onZuo(final Zean zean) {
23. //线性布局
24. zrv.setLayoutManager(new LinearLayoutManager(MainActivity.this));
25. //拿到适配器
26. ZuoAdapter adapter= new ZuoAdapter(MainActivity.this,zean);
27. zrv.setAdapter(adapter);
28. //调用点击事件
29. adapter.setOnItemClickListener(new ZuoAdapter.OnItemClickListener() {
30. @Override
31. public void onItemClick(View view, int position) {
32. int id = zean.getData().get(position).getCid();
33. presenter.FlShowYou(id);
34. }
35. });
36. }
37.  
38. @Override
39. public void onYou(Yean yean) {
40. //拿到适配器
41. ErAdapter adapter = new ErAdapter(MainActivity.this,yean);
42. yev.setAdapter(adapter);
43. //父级列表默认全部展开
44. int groupCount = yev.getCount();
45. for (int i=0; i<groupCount; i++)
46. {
47. yev.expandGroup(i);
48. }
49. }
50. }

左面RecyclerView的适配器

1. /**
2. * 左面适配器
3. */
4. public class ZuoAdapter extends RecyclerView.Adapter<ZuoAdapter.MyHolder> {
5. private Context context;
6. private Zean zean;
7. private OnItemClickListener mOnItemClickListener;
8.  
9. public ZuoAdapter(Context context, Zean list) {
10. this.context = context;
11. this.zean = list;
12. }
13. public interface OnItemClickListener{
14. void onItemClick(View view, int position);
15. }
16. public void setOnItemClickListener(OnItemClickListener mOnItemClickListener){
17. this.mOnItemClickListener = mOnItemClickListener;
18. }
19. @Override
20. public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
21. MyHolder holder = new MyHolder(LayoutInflater.from(context).inflate(R.layout.zuo_litem, parent, false));
22. return holder;
23. }
24. @Override
25. public void onBindViewHolder(final MyHolder holder, int position) {
26. holder.zuo_mz.setText(zean.getData().get(position).getName());
27. if (mOnItemClickListener != null){
28. holder.zuo_mz.setOnClickListener(new View.OnClickListener() {
29. @Override
30. public void onClick(View view) {
31. int position = holder.getLayoutPosition(); // 1
32. mOnItemClickListener.onItemClick(holder.itemView,position); // 2
33. }
34. });
35. }
36. }
37.  
38. @Override
39. public int getItemCount() {
40. return zean.getData().size();
41. }
42.  
43. class MyHolder extends RecyclerView.ViewHolder {
44. TextView zuo_mz;
45. public MyHolder(View itemView) {
46. super(itemView);
47. zuo_mz = itemView.findViewById(R.id.zuo_mz);
48. }
49. }
50. }

左面适配器的布局

1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
2. android:layout_width="match_parent"
3. android:layout_height="wrap_content"
4. android:orientation="vertical"
5. >
6. <TextView
7. android:id="@+id/zuo_mz"
8. android:layout_width="match_parent"
9. android:layout_height="50dp"
10. android:gravity="center"
11. android:text="名字"
12. android:layout_gravity="center"
13. />
14. </LinearLayout>

右面二级列表适配器

1. /**
2. * 二级列表适配器
3. */
4. public class ErAdapter extends BaseExpandableListAdapter{
5. private Context context;
6. private Yean yean;
7.  
8. public ErAdapter(Context context, Yean yean) {
9. this.context = context;
10. this.yean = yean;
11. }
12.  
13. @Override
14. public int getGroupCount() {
15. return yean.getData().size();
16. }
17.  
18. @Override
19. public int getChildrenCount(int i) {
20. return 1;
21. }
22.  
23. @Override
24. public Object getGroup(int i) {
25. return yean.getData().get(i);
26. }
27.  
28. @Override
29. public Object getChild(int i, int i1) {
30. return yean.getData().get(i).getList().get(i);
31. }
32.  
33. @Override
34. public long getGroupId(int i) {
35. return i;
36. }
37.  
38. @Override
39. public long getChildId(int i, int i1) {
40. return i1;
41. }
42.  
43. @Override
44. public boolean hasStableIds() {
45. return false;
46. }
47.  
48. @Override
49. public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
50. //父级
51. View v = View.inflate(context, R.layout.you_litem, null);
52. TextView expand_tv = v.findViewById(R.id.you_you);
53. expand_tv.setText(yean.getData().get(i).getName());
54. return v;
55. }
56.  
57. @Override
58. public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
59. //嵌套RecyclerView的布局
60. View v = View.inflate(context,R.layout.youhai_litem,null);
61. RecyclerView expand_recycler = v.findViewById(R.id.rvClass);
62. //RecyclerView网格格式
63. GridLayoutManager gridlayout = new GridLayoutManager(context,3);
64. expand_recycler.setLayoutManager(gridlayout);
65. //RecyclerView的适配器
66. setchild_Aapterer chapter = new setchild_Aapterer(context,yean,i,i1);
67. expand_recycler.setAdapter(chapter);
68. return v;
69. }
70.  
71. @Override
72. public boolean isChildSelectable(int i, int i1) {
73. return false;
74. }
75. }

右面适配器二级列表嵌套的RecyclerView的适配器

1. /**
2. * 二级列表嵌套RecyclerView的适配器
3. */
4.  
5. public class setchild_Aapterer extends RecyclerView.Adapter<setchild_Aapterer.ViewHodler>{
6. private Context context;
7. private Yean yean;
8. private int i,i1;
9. private OnItemClickListener mOnItemClickListener;
10.  
11. public setchild_Aapterer(Context context,Yean list,int i,int i1) {
12. this.context = context;
13. this.yean = list;
14. this.i = i;
15. this.i1 = i1;
16. }
17. //点击事件
18. public interface OnItemClickListener{
19. void onItemClick(View view, int position);
20. }
21. public void setOnItemClickListener(OnItemClickListener mOnItemClickListener){
22. this.mOnItemClickListener = mOnItemClickListener;
23. }
24. @Override
25. public setchild_Aapterer.ViewHodler onCreateViewHolder(ViewGroup parent, int viewType) {
26. View v = View.inflate(context, R.layout.child_item,null);
27. ViewHodler hodler = new ViewHodler(v);
28. hodler.img_child = v.findViewById(R.id.img_child);
29. hodler.tv_child = v.findViewById(R.id.tv_child);
30. return hodler;
31. }
32.  
33. @Override
34. public void onBindViewHolder(final setchild_Aapterer.ViewHodler holder, int position) {
35.  
36. String[] str =yean.getData().get(i).getList().get(position).getIcon().split("\\|");
37. String s = str[0];
38. Glide.with(context).load(s).into(holder.img_child);
39. holder.tv_child.setText(yean.getData().get(i).getList().get(position).getName());
40.  
41. if (mOnItemClickListener != null){
42. holder.img_child.setOnClickListener(new View.OnClickListener() {
43. @Override
44. public void onClick(View view) {
45. int position =holder.getLayoutPosition();
46. mOnItemClickListener.onItemClick(holder.itemView,position); //
47. }
48. });
49. }
50. }
51.  
52. @Override
53. public int getItemCount() {
54. return yean.getData().get(i).getList().size();
55. }
56.  
57. public class ViewHodler extends RecyclerView.ViewHolder {
58. private ImageView img_child;
59. private TextView tv_child;
60. public ViewHodler(View itemView) {
61. super(itemView);
62. }
63. }
64. }

child_item

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="match_parent"
4. android:layout_height="match_parent"
5. android:orientation="vertical"
6. >
7. <ImageView
8. android:id="@+id/img_child"
9. android:layout_width="60dp"
10. android:layout_height="60dp"
11. android:layout_gravity="center"
12. />
13. <TextView
14. android:id="@+id/tv_child"
15. android:layout_width="wrap_content"
16. android:layout_height="wrap_content"
17. android:text="名字"
18. android:layout_gravity="center"
19. />
20.  
21.  
22. </LinearLayout>

--------------------- 本文来自 小神奇 的CSDN 博客 ，全文地址请点击：https://blog.csdn.net/Star_Q/article/details/78607341?utm_source=copy