Afficher ma position

Cet exemple montre comment activer le calque Ma position et indique comment utiliser le bouton "Ma position" pour afficher la position actuelle de l'appareil (représentée par un point bleu) sur la carte.

Pour en savoir plus, reportez-vous à la documentation.

Premiers pas

Avant d'essayer l'exemple de code, vous devez configurer votre environnement de développement. Pour en savoir plus, consultez Exemples de code du SDK Maps pour Android.

Voir le code

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("MissingPermission")
    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, "dialog")
            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, "MyLocation button clicked", Toast.LENGTH_SHORT)
            .show()
        // Return false so that we don't consume the event and the default behavior still occurs
        // (the camera animates to the user's current position).
        return false
    }

    override fun onMyLocationClick(location: Location) {
        Toast.makeText(this, "Current location:\n$location", Toast.LENGTH_LONG)
            .show()
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<String>,
        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, "dialog")
    }

    companion object {
        /**
         * Request code for location permission request.
         *
         * @see .onRequestPermissionsResult
         */
        private const val LOCATION_PERMISSION_REQUEST_CODE = 1
    }
}
MyLocationDemoActivity.kt

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("MissingPermission")
    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, "MyLocation button clicked", Toast.LENGTH_SHORT).show();
        // Return false so that we don't consume the event and the default behavior still occurs
        // (the camera animates to the user's current position).
        return false;
    }

    @Override
    public void onMyLocationClick(@NonNull Location location) {
        Toast.makeText(this, "Current 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(), "dialog");
    }

}
MyLocationDemoActivity.java

Cloner et exécuter les exemples

Git est requis pour exécuter cet exemple en local. La commande suivante clone le dépôt de l'application exemple.

git clone git@github.com:googlemaps-samples/android-samples.git

Importez le projet exemple dans Android Studio :

  1. Dans Android Studio, sélectionnez File > New > Import Project (Fichier > Nouveau > Importer un projet).

  2. Accédez à l'emplacement où vous avez enregistré le dépôt et sélectionnez le répertoire du projet pour Kotlin ou Java :

    • Kotlin : PATH-REPO/android-samples/ApiDemos/kotlin
    • Java : PATH-REPO/android-samples/ApiDemos/java
  3. Sélectionnez Ouvrir. Android Studio crée votre projet à l'aide de l'outil de compilation Gradle.
  4. Créez un fichier secrets.properties vide dans le même répertoire que le fichier local.properties de votre projet. Pour en savoir plus, consultez Ajouter votre clé API au projet.

  5. Ajoutez la chaîne suivante à secrets.properties en remplaçant YOUR_API_KEY par la valeur de votre clé API :

    MAPS_API_KEY=YOUR_API_KEY
  6. Exécutez l'application.