Я разработчик нового приложения android, и мне нужна помощь. Пожалуйста. Мне нужно знать, как добавить кнопку «Мне нравится» внутри (Recyclerview), связанную с базой данных (Mysql), и подключиться через библиотеку Volley, чтобы сохранить все лайки пользователей. И посмотреть, сколько лайков имеет каждый топи c. Пример на рисунке .. 
Мне нужно добавить его в этот прикрепленный проект.
MainActivity
public class MainActivity extends AppCompatActivity {
List<RecyclerViewData> recyclerViewDataList;
RecyclerView recyclerView;
private RVAdapter rvAdapter;
private static final String TAG="apple";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setTitle("Employee List");
recyclerViewDataList=new ArrayList<>();
recyclerView=findViewById(R.id.recyclerView);
LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this);
recyclerView.setLayoutManager(linearLayoutManager);
MakeVolleyConnection();
}
private void MakeVolleyConnection() {
recyclerViewDataList = new ArrayList<>();
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET,
"http://10.0.13.45/v/parsing.php", null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray dataArray = response.getJSONArray("data");
for (int i = 0; i < dataArray.length(); i++) {
JSONObject userData = dataArray.getJSONObject(i);
RecyclerViewData recyclerViewData = new RecyclerViewData();
recyclerViewData.setId(userData.getInt("id"));
recyclerViewData.setFirstname(userData.getString("first_name"));
recyclerViewData.setLastname(userData.getString("last_name"));
recyclerViewData.setAvatar(userData.getString("avatar"));
recyclerViewDataList.add(recyclerViewData);
}
rvAdapter = new RVAdapter(recyclerViewDataList, MainActivity.this);
recyclerView.setAdapter(rvAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, ""+error.networkResponse,Toast.LENGTH_SHORT).show();
}
});
MySingleton.getInstance(this).addToRequestQueue(jsonObjectRequest);
}
}
MySingleton
public class MySingleton {
private static MySingleton mInstance;
private RequestQueue mRequestQueue;
private static Context mContext;
private MySingleton(Context context){
// Specify the application context
mContext = context;
// Get the request queue
mRequestQueue = getRequestQueue();
}
public static synchronized MySingleton getInstance(Context context){
// If Instance is null then initialize new Instance
if(mInstance == null){
mInstance = new MySingleton(context);
}
// Return MySingleton new Instance
return mInstance;
}
public RequestQueue getRequestQueue(){
// If RequestQueue is null the initialize new RequestQueue
if(mRequestQueue == null){
mRequestQueue = Volley.newRequestQueue(mContext.getApplicationContext());
}
// Return RequestQueue
return mRequestQueue;
}
public<T> void addToRequestQueue(Request<T> request){
// Add the specified request to the request queue
getRequestQueue().add(request);
}
}
RecyclerViewData
public class RecyclerViewData {
private int id;
private String firstname;
private String lastname;
private String avatar;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
public String getAvatar() {
return avatar;
}
public void setAvatar(String avatar) {
this.avatar = avatar;
}
}
RVAdapter
public class RVAdapter extends RecyclerView.Adapter<RVAdapter.RVHOLDER> {
List<RecyclerViewData> recyclerViewDataList;
Context mContext;
// Constructor with List and Context which we'll pass from RecyclerView Activity after a connection to Volley. And application context for the listener that we'll implement this later.
public RVAdapter(List<RecyclerViewData> recyclerViewDataList, Context mContext) {
this.recyclerViewDataList = recyclerViewDataList;
this.mContext = mContext;
}
// Override the method onCreateViewHolder, which will call the custom view holder that needs to be initialized. We specify the layout that each item to be used, so we can achieve this using Layout Inflator to inflate the layout and passing the output to constructor of custom ViewHolder.
@NonNull
@Override
public RVHOLDER onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View itemView = LayoutInflater.from(mContext).inflate(R.layout.adapter_layout, viewGroup, false);
RVHOLDER rvholder = new RVHOLDER(itemView);
return rvholder;
}
//onBindViewHolder is for specifying the each item of RecyclerView. This is very similar to getView() method on ListView. In our example, this is where you need to set the user's id, name and image.
@Override
public void onBindViewHolder(@NonNull RVHOLDER rvholder, int i) {
rvholder.id.setText("User id is "+recyclerViewDataList.get(i).getId());
rvholder.first_name.setText(recyclerViewDataList.get(i).getFirstname() + " " + recyclerViewDataList.get(i).getLastname());
Picasso.get().load(recyclerViewDataList.get(i).getAvatar()).into(rvholder.avatar);
}
//We need to return the size for RecyclerView as how long a RecyclerView is, Our data is in list so passing data.size() will return the number as long as we have.
@Override
public int getItemCount() {
return recyclerViewDataList.size();
}
//This is CustomView holder that we had discuss it earlier above and inflated it in onCreateView() method. This constructor links with the xml to set the data, which we set into onBindViewHolder().
class RVHOLDER extends RecyclerView.ViewHolder {
TextView id;
private TextView first_name;
private ImageView avatar;
public RVHOLDER(@NonNull View itemView) {
super(itemView);
id = itemView.findViewById(R.id.id);
first_name = itemView.findViewById(R.id.firstname_lastname);
avatar = itemView.findViewById(R.id.avatar);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.cardview.widget.CardView
android:id="@+id/card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardCornerRadius="4dp"
card_view:cardUseCompatPadding="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="@+id/avatar"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginRight="16dp"
android:scaleType="fitCenter" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/firstname_lastname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:textAppearanceMedium" />
<TextView
android:id="@+id/id"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
</RelativeLayout>
<?php
$con=mysqli_connect("localhost","root","root","test");
$sql="SELECT * FROM testtable";
$result=mysqli_query($con,$sql);
$data=array();
while($row=mysqli_fetch_assoc($result)){
$data["data"][]=$row;
}
header('Content-Type:Application/json');
echo json_encode($data);
?>