how to connect android application to sql server

package com.instinctcoder.sqlitedb;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class StudentDetail extends Activity implements android.view.View.OnClickListener{

    Button btnSave ,  btnDelete;
    Button btnClose;
    EditText editTextName;
    EditText editTextEmail;
    EditText editTextAge;
    private int _Student_Id=0;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_student_detail);
        
        btnSave = (Button) findViewById(R.id.btnSave);
        btnDelete = (Button) findViewById(R.id.btnDelete);
        btnClose = (Button) findViewById(R.id.btnClose);
 
        editTextName = (EditText) findViewById(R.id.editTextName);
        editTextEmail = (EditText) findViewById(R.id.editTextEmail);
        editTextAge = (EditText) findViewById(R.id.editTextAge);
 
        btnSave.setOnClickListener(this);
        btnDelete.setOnClickListener(this);
        btnClose.setOnClickListener(this);
 
 
        _Student_Id =0;
        Intent intent = getIntent();
        _Student_Id =intent.getIntExtra("student_Id", 0);
        StudentRepo repo = new StudentRepo(this);
        Student student = new Student();
        student = repo.getStudentById(_Student_Id);
 
        editTextAge.setText(String.valueOf(student.age));
        editTextName.setText(student.name);
        editTextEmail.setText(student.email);
    }

    @Override
    public void onClick(View view) {
        // TODO Auto-generated method stub
         if (view == findViewById(R.id.btnSave)){
                StudentRepo repo = new StudentRepo(this);
                Student student = new Student();
                student.age= Integer.parseInt(editTextAge.getText().toString());
                student.email=editTextEmail.getText().toString();
                student.name=editTextName.getText().toString();
                student.student_ID=_Student_Id;
     
                if (_Student_Id==0){
                   _Student_Id = repo.insert(student);
     
                    Toast.makeText(this,"New Student Insert",Toast.LENGTH_SHORT).show();
                }else{
     
                    repo.update(student);
                    Toast.makeText(this,"Student Record updated",Toast.LENGTH_SHORT).show();
                }
            }else if (view== findViewById(R.id.btnDelete)){
                StudentRepo repo = new StudentRepo(this);
                repo.delete(_Student_Id);
                Toast.makeText(this, "Student Record Deleted", Toast.LENGTH_SHORT);
                finish();
            }else if (view== findViewById(R.id.btnClose)){
                finish();
            }
    }
}