Button Click Open The Fragment

java Activity code

package com.example.reBLISS.view;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;

import android.app.FragmentTransaction;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import com.example.reBLISS.R;
import com.example.reBLISS.fragment.FragmentCheckIn;
import com.example.reBLISS.fragment.FragmentCheckOut;

public class ActivitySelfies2 extends AppCompatActivity {
   private Button btncheckin,btncheckOut;
   private ImageView  backbtn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_selfies2);

             btncheckin=findViewById(R.id.checkin);
             btncheckOut=findViewById(R.id.checkout);
            backbtn=findViewById(R.id.back_btn);


        FragmentManager fm = getSupportFragmentManager();
        FragmentCheckIn fragment = new FragmentCheckIn();
        fm.beginTransaction().add(R.id.fragmentcontainer,fragment).commit();
        btncheckin.setEnabled(false);
        btncheckOut.setEnabled(true);



             btncheckin.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View view) {

                     FragmentManager fm = getSupportFragmentManager();
                     FragmentCheckIn fragment = new FragmentCheckIn();
                     fm.beginTransaction().add(R.id.fragmentcontainer,fragment).commit();
                     btncheckin.setEnabled(false);
                     btncheckOut.setEnabled(true);

                 }
             });

                btncheckOut.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View view) {

                     FragmentManager fm = getSupportFragmentManager();
                     FragmentCheckOut fragment = new FragmentCheckOut();
                     fm.beginTransaction().add(R.id.fragmentcontainer,fragment).commit();

                     btncheckOut.setEnabled(false);
                     btncheckin.setEnabled(true);

                 }
             });

                 backbtn.setOnClickListener(new View.OnClickListener() {
                     @Override
                     public void onClick(View view) {
                         finish();
                     }
                 });


    }
}

  Xml Activity Code

<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
    android:layout_height="match_parent"
    tools:context=".view.ActivitySelfies2">




    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/line"
        android:orientation="vertical">

        <androidx.appcompat.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/toolbar"
            app:titleTextColor="@color/white"
            android:background="@drawable/toolbar_gradiant">


                <ImageView
                    android:layout_width="35dp"
                    android:layout_height="35dp"
                    android:id="@+id/back_btn"
                    android:src="@drawable/arrow_back_24"
                    >


                </ImageView>
                <TextView
                    android:layout_width="match_parent"
                    android:text="Selfies"
                    android:layout_gravity="center"
                    android:gravity="center"
                    android:layout_marginEnd="33dp"
                    android:textSize="21dp"
                    android:textColor="@color/white"
                    android:textStyle="bold"
                    android:layout_height="wrap_content">


                </TextView>




        </androidx.appcompat.widget.Toolbar>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:weightSum="2"
        android:background="@color/white"

        android:layout_height="60dp">


        <Button
            android:layout_width="wrap_content"
            android:id="@+id/checkin"
           android:layout_marginLeft="20dp"

            android:layout_marginTop="10dp"
            android:layout_marginBottom="10dp"
            android:background="@color/appcolor"
            android:text="Check In"
             android:layout_weight="1"
             android:layout_height="wrap_content">

        </Button>


        <Button
            android:layout_width="wrap_content"
            android:text="Check Out"
             android:layout_weight="1"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:layout_marginTop="10dp"
            android:layout_marginBottom="10dp"
            android:background="@color/appcolor"
            android:id="@+id/checkout"

            android:layout_height="wrap_content">

        </Button>

    </LinearLayout>


     <FrameLayout
         android:layout_width="match_parent"

         android:id="@+id/fragmentcontainer"
         android:layout_height="wrap_content">


     </FrameLayout>

</LinearLayout>

Fragment java Code

package com.example.reBLISS.fragment;

import android.os.Bundle;

import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.reBLISS.R;
import com.example.reBLISS.adepters.SelfiesAdepaterIn;
import com.example.reBLISS.helper.MySingleton;
import com.example.reBLISS.modal.SelfieResponse;
import com.example.reBLISS.retrofit.ApiClient;
import com.example.reBLISS.retrofit.ApiInterface;
import com.kaopiz.kprogresshud.KProgressHUD;

import java.util.HashMap;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link FragmentCheckIn#newInstance} factory method to
 * create an instance of this fragment.
 */
public class FragmentCheckIn extends Fragment {
    public MySingleton mySingleton;
    public RecyclerView recyclerViewIn;
    public SelfieResponse selfieResponse;

    private KProgressHUD kProgressHUD;

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public FragmentCheckIn() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment FragmentCheckIn.
     */
    // TODO: Rename and change types and number of parameters
    public static FragmentCheckIn newInstance(String param1, String param2) {
        FragmentCheckIn fragment = new FragmentCheckIn();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
         selfieResponse =new SelfieResponse();
        mySingleton=new MySingleton(getContext());
        View view=inflater.inflate(R.layout.fragment_check_in, container, false);
        recyclerViewIn  =view.findViewById(R.id.recycheckoutIN);








        try {
            kProgressHUD = KProgressHUD.create(getContext())
                    .setStyle(KProgressHUD.Style.SPIN_INDETERMINATE)
                    .setCancellable(false)
                    .setAnimationSpeed(2)
                    .setDimAmount(0.5f)
                    .show();
        } catch (Exception e) {
            e.printStackTrace();
        }

        HashMap<String, String> hashMap = new HashMap<>();
        hashMap.put("uid",mySingleton.getData("userUid"));
        ApiInterface apiInterface = ApiClient.getClient().create(ApiInterface.class);
        Call<SelfieResponse> call=apiInterface.getSelfies(hashMap);

        call.enqueue(new Callback<SelfieResponse>() {
            @Override
            public void onResponse(Call<SelfieResponse> call, Response<SelfieResponse> response) {
                selfieResponse=response.body();


                //    Toast.makeText(getApplicationContext(),""+response.body().getData().get(0).getCheckinlocation(),Toast.LENGTH_LONG).show();
                LinearLayoutManager linearLayoutManager= new  LinearLayoutManager(getContext());
                SelfiesAdepaterIn selfiesAdepater =new SelfiesAdepaterIn(selfieResponse);
                recyclerViewIn.setLayoutManager(linearLayoutManager);
                recyclerViewIn.setAdapter(selfiesAdepater);




                if (kProgressHUD.isShowing())

                {
                    kProgressHUD.dismiss();
                }



            }

            @Override
            public void onFailure(Call<SelfieResponse> call, Throwable t) {
                Log.d("yes","ok"+t);


                if (kProgressHUD.isShowing())

                {
                    kProgressHUD.dismiss();
                }
            }
        });





        return view;

    }
}

Fragment Xml  Code

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
android:background="@color/white"
    tools:context=".fragment.FragmentCheckIn">



    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycheckoutIN"
        android:layout_width="match_parent"

        android:layout_height="match_parent"/>
</FrameLayout>