Hướng dẫn và ví dụ Google Maps Android API

<!-- Add to AndroidManifest.xml -->

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="YOUR_API_KEY"/>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.o7planning.mygooglemap">


    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="YOUR_API_KEY" />

        
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

implementation 'com.google.android.gms:play-services-maps:17.0.0'

package org.o7planning.mygooglemap;

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.MarkerOptions;

public class MyMapFragment extends SupportMapFragment implements OnMapReadyCallback {

    private GoogleMap googleMap;

    public MyMapFragment()  {
        getMapAsync(this);
    }

    @Override
    public void onMapReady(final GoogleMap gmap) {
        this.googleMap = gmap;

        // Set default position
        // Add a marker in Sydney and move the camera
        LatLng vietnam = new LatLng(14.0583, 108.2772); // 14.0583° N, 108.2772° E
        this.googleMap.addMarker(new MarkerOptions().position(vietnam).title("Marker in Vietnam"));
        this.googleMap.moveCamera(CameraUpdateFactory.newLatLng(vietnam));

        this.googleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
            @Override
            public void onMapClick(LatLng latLng) {
                MarkerOptions markerOptions = new MarkerOptions();
                markerOptions.position(latLng);
                markerOptions.title(latLng.latitude + " : "+ latLng.longitude);
                // Clear previously click position.
                googleMap.clear();
                // Zoom the Marker
                googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 10));
                // Add Marker on Map
                googleMap.addMarker(markerOptions);
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <fragment
        android:id="@+id/fragment_map"
        android:name="org.o7planning.mygooglemap.MyMapFragment"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

package org.o7planning.mygooglemap;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import androidx.fragment.app.FragmentManager;

public class MainActivity extends AppCompatActivity    {

    private MyMapFragment myMapFragment;

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

        FragmentManager fragmentManager = this.getSupportFragmentManager();
        this.myMapFragment = (MyMapFragment) fragmentManager.findFragmentById(R.id.fragment_map);

    }

}