How to regsiter plugin manually in capacitor 3?

Capacitor
1

I am trying to use plugin for background location tracking on android capacitor suppose to register plugin automatically in MainActivity.java but thats not happening. I tried to use that manually but that is also not happening

package com.siloc.users;

import com.getcapacitor.BridgeActivity;
import android.os.Bundle;

import com.getcapacitor.BridgeActivity;
import com.getcapacitor.Plugin;

import java.util.ArrayList;
import com.hemangkumar.capacitorgooglemaps.CapacitorGoogleMaps;
import com.equimaps.capacitor_background_geolocation.BackgroundGeolocation;
public class MainActivity extends BridgeActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        registerPlugin(CapacitorGoogleMaps.class);
        registerPlugin(BackgroundGeolocation.class);
     
    }

}

How i could do that ?