How to Add Data to Back4App Database in Android?

import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.SaveCallback;

public class MainActivity extends AppCompatActivity {

    // creating variables for our edit text
    private EditText courseNameEdt, courseDurationEdt, courseDescriptionEdt;
    
    // creating variable for button
    private Button submitCourseBtn;
    
    // creating a strings for storing our values from edittext fields.
    private String courseName, courseDuration, courseDescription;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // initializing our edittext and buttons
        courseNameEdt = findViewById(R.id.idEdtCourseName);
        courseDescriptionEdt = findViewById(R.id.idEdtCourseDescription);
        courseDurationEdt = findViewById(R.id.idEdtCourseDuration);
        submitCourseBtn = findViewById(R.id.idBtnSubmitCourse);
        submitCourseBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                
                // getting data from edittext fields.
                courseName = courseNameEdt.getText().toString();
                courseDescription = courseDescriptionEdt.getText().toString();
                courseDuration = courseDurationEdt.getText().toString();

                // validating the text fields if empty or not.
                if (TextUtils.isEmpty(courseName)) {
                    courseNameEdt.setError("Please enter Course Name");
                } else if (TextUtils.isEmpty(courseDescription)) {
                    courseDescriptionEdt.setError("Please enter Course Description");
                } else if (TextUtils.isEmpty(courseDuration)) {
                    courseDurationEdt.setError("Please enter Course Duration");
                } else {
                    // calling method to add data to Firebase Firestore.
                    addDataToDatabase(courseName, courseDescription, courseDuration);
                }
            }
        });
    }

    private void addDataToDatabase(String courseName, String courseDescription, String courseDuration) {
        
        // Configure Query
        ParseObject courseList = new ParseObject("courses");
        
        // on below line we are adding our data with their key value in our object.
        courseList.put("courseName", courseName);
        courseList.put("courseDescription", courseDescription);
        courseList.put("courseDuration", courseDuration);
        
        // after adding all data we are calling a
        // method to save our data in background.
        courseList.saveInBackground(new SaveCallback() {
            @Override
            public void done(ParseException e) {
                // inside on done method we are checking
                // if the error is null or not.
                if (e == null) {
                   
                    // if the error is null we are displaying a simple toast message.
                    Toast.makeText(MainActivity.this, "Data has been successfully added to Database", Toast.LENGTH_SHORT).show();
                   
                    // on below line we are setting our edit text fields to empty value.
                    courseNameEdt.setText("");
                    courseDescriptionEdt.setText("");
                    courseDurationEdt.setText("");
                } else {
                    // if the error is not null we will be 
                    // displaying an error message to our user.
                    Toast.makeText(getApplicationContext(), e.getMessage().toString(), Toast.LENGTH_LONG).show();
                }
            }
        });
    }
}