JDBC in Android with SSL Certificates

Question

I am able to connect to postgresql in my Android App using JDBC:

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.StrictMode;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class MainActivity extends AppCompatActivity {

    private static String ip = "HOST_IP";
    private static String port = "5432";
    private static String Classes = "org.postgresql.Driver";
    private static String database = "DATABASE_NAME";
    private static String username = "USERNAME";
    private static String password = "PASSWORD";
    private static String url = "jdbc:postgresql://"+ip+":"+port+"/"+database;

    private Connection connection = null;


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

    public void start(View view) {
        ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.INTERNET}, PackageManager.PERMISSION_GRANTED);
      
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
        try {
            Class.forName(Classes);
            connection = DriverManager.getConnection(url, username,password);
            Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
            Toast.makeText(this, "Class fail", Toast.LENGTH_SHORT).show();
        } catch (SQLException e) {
            e.printStackTrace();
            Toast.makeText(this, "Connected no", Toast.LENGTH_SHORT).show();
        }
    }
}

It works fine. But how can i manage it to use SSL (verify-ca)? I have all 3 certificates (server, client and key) in .pem format. Where should i store these certificates and how to use wit JDBC?