HomeFragment.java

package com.ruszala.fueltrack.ui.orders.map;

import androidx.fragment.app.FragmentManager;
import androidx.lifecycle.ViewModelProviders;

import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

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

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.ruszala.fueltrack.R;
import com.ruszala.fueltrack.domain.Order;

import java.util.ArrayList;

public class OrderMapPreviewFragment extends Fragment implements OnMapReadyCallback {

    private OrderMapPreviewViewModel mViewModel;

    private SupportMapFragment fragment;
    private GoogleMap map;

    public static OrderMapPreviewFragment newInstance() {
        return new OrderMapPreviewFragment();
    }

    View root;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        root =  inflater.inflate(R.layout.order_map_preview_fragment, container, false);

        return root;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mViewModel = ViewModelProviders.of(this).get(OrderMapPreviewViewModel.class);
        // TODO: Use the ViewModel
        FragmentManager fm = getChildFragmentManager();
        fragment = (SupportMapFragment) fm.findFragmentById(R.id.map);
        if (fragment == null) {
            fragment = SupportMapFragment.newInstance();
            fm.beginTransaction().replace(R.id.map, fragment).commit();

        }
        fragment.getMapAsync(this);

    }

    @Override
    public void onMapReady(final GoogleMap googleMap) {
        Log.d("mylog", "OrderMapPreviewFragment onMapReady: ");
        ArrayList<Order> orders = new ArrayList<>();
        Order order = new Order();
        order.setPosition(new LatLng(56.461430, -2.968110));
        Order order2 = new Order();
        order2.setPosition(new LatLng(56.484008, -2.993350));
        Order order3 = new Order();
        order3.setPosition(new LatLng(56.396051, -3.054269));
        orders.add(order);
        orders.add(order2);
        orders.add(order3);



        LatLngBounds.Builder builder;

        MarkerOptions position = new MarkerOptions().position(order.getPosition());
        Marker marker = googleMap.addMarker(position);
        marker.remove();

        googleMap.addMarker(new MarkerOptions().position(order2.getPosition()));
        googleMap.addMarker(new MarkerOptions().position(order3.getPosition()));



        for(Order o:orders){
        }


        builder = new LatLngBounds.Builder();
        builder.include(order.getPosition());
        builder.include(order2.getPosition());
        builder.include(order3.getPosition());
        final LatLngBounds bounds = builder.build();
        googleMap.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() {
            @Override
            public void onMapLoaded() {
                googleMap.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, 200));
            }
        });

    }
}

order_map_preview_fragment.xml

<?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"
    tools:context=".ui.orders.map.OrderMapPreviewFragment">

    <fragment 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:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment" />

</FrameLayout>