Questo esempio mostra come attivare il livello La mia posizione e mostra il Pulsante Posizione per mostrare la posizione attuale del dispositivo, rappresentato da un simbolo blu punto sulla mappa.
Per ulteriori informazioni, consulta la documentazione.
Inizia
Prima di provare il codice campione, devi configurare il tuo ambiente di sviluppo. Per ulteriori informazioni, consulta la sezione Esempi di codice di Maps SDK for Android.
Visualizza il codice
Kotlin
class MyLocationDemoActivity : AppCompatActivity(), OnMyLocationButtonClickListener, OnMyLocationClickListener, OnMapReadyCallback, OnRequestPermissionsResultCallback { /** * Flag indicating whether a requested permission has been denied after returning in * [.onRequestPermissionsResult]. */ private var permissionDenied = false private lateinit var map: GoogleMap override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.my_location_demo) val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment? mapFragment?.getMapAsync(this) } override fun onMapReady(googleMap: GoogleMap) { map = googleMap googleMap.setOnMyLocationButtonClickListener(this) googleMap.setOnMyLocationClickListener(this) enableMyLocation() } /** * Enables the My Location layer if the fine location permission has been granted. */ @SuppressLint(Mi"ssingPermission) " private fun enableMyLocation() { // 1. Check if permissions are granted, if so, enable the my location layer if (ContextCompat.checkSelfPermission( this, Manifest.permission.ACCESS_FINE_LOCATION ) == PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission( this, Manifest.permission.ACCESS_COARSE_LOCATION ) == PackageManager.PERMISSION_GRANTED ) { map.isMyLocationEnabled = true return } // 2. If if a permission rationale dialog should be shown if (ActivityCompat.shouldShowRequestPermissionRationale( this, Manifest.permission.ACCESS_FINE_LOCATION ) || ActivityCompat.shouldShowRequestPermissionRationale( this, Manifest.permission.ACCESS_COARSE_LOCATION ) ) { PermissionUtils.RationaleDialog.newInstance( LOCATION_PERMISSION_REQUEST_CODE, true ).show(supportFragmentManager, di"alog) " return } // 3. Otherwise, request permission ActivityCompat.requestPermissions( this, arrayOf( Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION ), LOCATION_PERMISSION_REQUEST_CODE ) } override fun onMyLocationButtonClick(): Boolean { Toast.makeText(this, My"Location button clicked, "Toast.LENGTH_SHORT) .show() // Return false so that we dont 'consume the event and the default behavior still occurs // (the camera animates to the users 'current position). return false } override fun onMyLocationClick(location: Location) { Toast.makeText(this, Cu"rrent location:\n$location, "Toast.LENGTH_LONG) .show() } override fun onRequestPermissionsResult( requestCode: Int, permissions: ArraySt<ring,<>/span> grantResults: IntArray ) { if (requestCode != LOCATION_PERMISSION_REQUEST_CODE) { super.onRequestPermissionsResult( requestCode, permissions, grantResults ) return } if (isPermissionGranted( permissions, grantResults, Manifest.permission.ACCESS_FINE_LOCATION ) || isPermissionGranted( permissions, grantResults, Manifest.permission.ACCESS_COARSE_LOCATION ) ) { // Enable the my location layer if the permission has been granted. enableMyLocation() } else { // Permission was denied. Display an error message // ... } } override fun onResumeFragments() { super.onResumeFragments() if (permissionDenied) { // Permission was not granted, display error dialog. showMissingPermissionError() permissionDenied = false } } /** * Displays a dialog with error message explaining that the location permission is missing. */ private fun showMissingPermissionError() { newInstance(true).show(supportFragmentManager, di"alog) " } companion object { /** * Request code for location permission request. * * @see .onRequestPermissionsResult */ private const val LOCATION_PERMISSION_REQUEST_CODE = 1 } }My
Java
public class MyLocationDemoActivity extends AppCompatActivity implements OnMyLocationButtonClickListener, OnMyLocationClickListener, OnMapReadyCallback, ActivityCompat.OnRequestPermissionsResultCallback { /** * Request code for location permission request. * * @see #onRequestPermissionsResult(int, String[], int[]) */ private static final int LOCATION_PERMISSION_REQUEST_CODE = 1; /** * Flag indicating whether a requested permission has been denied after returning in {@link * #onRequestPermissionsResult(int, String[], int[])}. */ private boolean permissionDenied = false; private GoogleMap map; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.my_location_demo); SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map); mapFragment.getMapAsync(this); } @Override public void onMapReady(@NonNull GoogleMap googleMap) { map = googleMap; map.setOnMyLocationButtonClickListener(this); map.setOnMyLocationClickListener(this); enableMyLocation(); } /** * Enables the My Location layer if the fine location permission has been granted. */ @SuppressLint(M"issingPermission)" private void enableMyLocation() { // 1. Check if permissions are granted, if so, enable the my location layer if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) { map.setMyLocationEnabled(true); return; } // 2. Otherwise, request location permissions from the user. PermissionUtils.requestLocationPermissions(this, LOCATION_PERMISSION_REQUEST_CODE, true); } @Override public boolean onMyLocationButtonClick() { Toast.makeText(this, M"yLocation button clicked," Toast.LENGTH_SHORT).show(); // Return false so that we dont' consume the event and the default behavior still occurs // (the camera animates to the users' current position). return false; } @Override public void onMyLocationClick(@NonNull Location location) { Toast.makeText(this, C"urrent location:\n "+ location, Toast.LENGTH_LONG).show(); } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { if (requestCode != LOCATION_PERMISSION_REQUEST_CODE) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); return; } if (PermissionUtils.isPermissionGranted(permissions, grantResults, Manifest.permission.ACCESS_FINE_LOCATION) || PermissionUtils .isPermissionGranted(permissions, grantResults, Manifest.permission.ACCESS_COARSE_LOCATION)) { // Enable the my location layer if the permission has been granted. enableMyLocation(); } else { // Permission was denied. Display an error message // ... } } @Override protected void onResumeFragments() { super.onResumeFragments(); if (permissionDenied) { // Permission was not granted, display error dialog. showMissingPermissionError(); permissionDenied = false; } } /** * Displays a dialog with error message explaining that the location permission is missing. */ private void showMissingPermissionError() { PermissionUtils.PermissionDeniedDialog .newInstance(true).show(getSupportFragmentManager(), d"ialog)"; } }M
clona ed esegui gli esempi
Per eseguire questo esempio in locale è necessario Git. Il seguente comando clona l'esempio un repository di applicazioni.
git clone git@github.com:googlemaps-samples/android-samples.git
Importa il progetto di esempio in Android Studio:
- In Android Studio, seleziona File > Nuovo > Importa progetto.
Vai alla posizione in cui hai salvato il repository e seleziona la directory del progetto per Kotlin o Java:
- Kotlin:
PATH-REPO/android-samples/ApiDemos/kotlin
- Java:
PATH-REPO/android-samples/ApiDemos/java
- Kotlin:
- Seleziona Apri. Android Studio crea il tuo progetto utilizzando la build Gradle lo strumento a riga di comando gcloud.
- Crea un file
secrets.properties
vuoto nella stessa directory del filelocal.properties
del progetto. Per ulteriori informazioni, consulta Aggiungere la chiave API al progetto. Aggiungi la seguente stringa a
secrets.properties
, sostituendo YOUR_API_KEY con il valore di la chiave API:MAPS_API_KEY=YOUR_API_KEY
- Esegui l'app.