Location Based Service
& Google Maps SDK 🗺️

<manifest 
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mapsapp">

    <!-- 1. Izin Akses GPS (Tingkat Akurat & Kasar) -->
    <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:theme="@style/Theme.MyApp">
        
        <!-- 2. Daftarkan API KEY Google Maps milikmu di sini! -->
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="AIzaSyBxxxx_PASTE_API_KEY_KAMU_DISINI_xxxx" />

        <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>

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- Kontainer Peta (Wajib Fragment) -->
    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- UI Overlay (Tombol yang mengambang di atas peta) -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="16dp"
        android:layout_alignParentBottom="true">

        <Button
            android:id="@+id/btnLokasi"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:text="LOKASI SAYA" 
            android:layout_marginEnd="8dp" />

        <Button
            android:id="@+id/btnMarker"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:text="TAMBAH MARKER" />
    </LinearLayout>

</RelativeLayout>

package com.example.mapsapp;

import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.widget.Button;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
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 MainActivity extends AppCompatActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    private FusedLocationProviderClient fusedLocationClient;
    private static final int KODE_IZIN_LOKASI = 99;

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

        Button btnLokasi = findViewById(R.id.btnLokasi);
        Button btnMarker = findViewById(R.id.btnMarker);

        // 1. Hubungkan Map Fragment di XML dengan Java
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        if (mapFragment != null) {
            // Panggil map secara async. Jika sudah siap, fungsi onMapReady akan tereksekusi otomatis.
            mapFragment.getMapAsync(this);
        }

        // Inisialisasi radar pelacak lokasi bawaan Google
        fusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

        // Aksi Tombol Minta Lokasi
        btnLokasi.setOnClickListener(v -> cekIzinLokasi());

        // Aksi Tombol Tambah Marker
        btnMarker.setOnClickListener(v -> {
            if (mMap != null) {
                // Objek LatLng membutuhkan koordinat Latitude dan Longitude (Format desimal)
                LatLng posisiCafe = new LatLng(-6.916002, 107.627578); // Makmur Jaya Coffee - Soka Bandung
                
                // Jatuhkan Marker ke Peta
                mMap.addMarker(new MarkerOptions()
                        .position(posisiCafe)
                        .title("☕ Makmur Jaya Coffee")
                        .snippet("Jl. Soka No.15, Bandung"));

                // Pindahkan/terbangkan kamera peta ke marker tersebut dengan Zoom level 15
                mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(posisiCafe, 15f));
            }
        });
    }

    // Fungsi ini dipanggil otomatis ketika Peta sudah berhasil dimuat (di-download)
    @Override
    public void onMapReady(@NonNull GoogleMap googleMap) {
        mMap = googleMap;
        
        // Arahkan kamera awal ke Indonesia saat pertama kali buka
        LatLng indo = new LatLng(-2.5489, 118.0149);
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(indo, 4f));
    }

    // --- MANAJEMEN IZIN (PERMISSIONS) ---
    private void cekIzinLokasi() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) 
                != PackageManager.PERMISSION_GRANTED) {
            // Munculkan Pop-up Minta Izin ke User
            ActivityCompat.requestPermissions(this, 
                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 
                    KODE_IZIN_LOKASI);
        } else {
            // Jika sudah diizinkan sebelumnya
            dapatkanLokasiTerkini();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == KODE_IZIN_LOKASI) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                dapatkanLokasiTerkini();
            } else {
                Toast.makeText(this, "Aplikasi butuh izin lokasi untuk fitur ini!", Toast.LENGTH_SHORT).show();
            }
        }
    }

    // --- TARIK SINYAL GPS SUNGGUHAN ---
    private void dapatkanLokasiTerkini() {
        // (Peringatan IDE akan merah jika kita tidak pasang SuppressLint, tapi aman kok karena kita sudah cek di atas)
        @SuppressWarnings("MissingPermission")
        
        // Aktifkan titik biru bawaan Google Maps
        mMap.setMyLocationEnabled(true);

        fusedLocationClient.getLastLocation().addOnSuccessListener(this, location -> {
            if (location != null) {
                double lat = location.getLatitude();
                double lng = location.getLongitude();
                
                LatLng lokasiSaya = new LatLng(lat, lng);
                mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(lokasiSaya, 16f));
                
                Toast.makeText(this, "Ketemu! Lat: " + lat + " Lng: " + lng, Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "Gagal melacak GPS (Hidupkan Lokasi HP-mu)", Toast.LENGTH_SHORT).show();
            }
        });
    }
}