Dessiner des polygones sur une carte

Cet exemple dessine des polygones de différentes formes et couleurs sur une 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



override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.polygon_demo)

    fillHueBar = findViewById<SeekBar>(R.id.fillHueSeekBar).apply {
        max = MAX_HUE_DEGREES
        progress = MAX_HUE_DEGREES / 2
    }

    fillAlphaBar = findViewById<SeekBar>(R.id.fillAlphaSeekBar).apply {
        max = MAX_ALPHA
        progress = MAX_ALPHA / 2
    }

    strokeWidthBar = findViewById<SeekBar>(R.id.strokeWidthSeekBar).apply {
        max = MAX_WIDTH_PX
        progress = MAX_WIDTH_PX / 3
    }

    strokeHueBar = findViewById<SeekBar>(R.id.strokeHueSeekBar).apply {
        max = MAX_HUE_DEGREES
        progress = 0
    }

    strokeAlphaBar = findViewById<SeekBar>(R.id.strokeAlphaSeekBar).apply {
        max = MAX_ALPHA
        progress = MAX_ALPHA
    }

    strokeJointTypeSpinner = findViewById<Spinner>(R.id.strokeJointTypeSpinner).apply {
        adapter = ArrayAdapter(
                this@PolygonDemoActivity, android.R.layout.simple_spinner_item,
                getResourceStrings(jointTypeNameResourceIds))
    }

    strokePatternSpinner = findViewById<Spinner>(R.id.strokePatternSpinner).apply {
        adapter = ArrayAdapter(
                this@PolygonDemoActivity, android.R.layout.simple_spinner_item,
                getResourceStrings(patternTypeNameResourceIds))
    }

    clickabilityCheckbox = findViewById(R.id.toggleClickability)

    val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment
    mapFragment.getMapAsync(this)
}

override fun onMapReady(googleMap: GoogleMap) {

    // return early if the map was not initialised properly
    googleMap ?: return

    val fillColorArgb = Color.HSVToColor(
            fillAlphaBar.progress, floatArrayOf(fillHueBar.progress.toFloat(), 1f, 1f))
    val strokeColorArgb = Color.HSVToColor(
            strokeAlphaBar.progress, floatArrayOf(strokeHueBar.progress.toFloat(), 1f, 1f))

    with(googleMap) {
        // Override the default content description on the view, for accessibility mode.
        setContentDescription(getString(R.string.polygon_demo_description))
        // Move the googleMap so that it is centered on the mutable polygon.
        moveCamera(CameraUpdateFactory.newLatLngZoom(center, 4f))

        // Create a rectangle with two rectangular holes.
        mutablePolygon = addPolygon(PolygonOptions().apply {
            addAll(createRectangle(center, 5.0, 5.0))
            addHole(createRectangle(LatLng(-22.0, 128.0), 1.0, 1.0))
            addHole(createRectangle(LatLng(-18.0, 133.0), 0.5, 1.5))
            fillColor(fillColorArgb)
            strokeColor(strokeColorArgb)
            strokeWidth(strokeWidthBar.progress.toFloat())
            clickable(clickabilityCheckbox.isChecked)
        })

        // Add a listener for polygon clicks that changes the clicked polygon's stroke color.
        setOnPolygonClickListener { polygon ->
            // Flip the red, green and blue components of the polygon's stroke color.
            polygon.strokeColor = polygon.strokeColor xor 0x00ffffff
        }
    }

    // set listeners on seekBars
    arrayOf(fillHueBar, fillAlphaBar, strokeWidthBar, strokeHueBar, strokeAlphaBar).map {
        it.setOnSeekBarChangeListener(this)
    }

    // set listeners on spinners
    arrayOf(strokeJointTypeSpinner, strokePatternSpinner).map {
        it.onItemSelectedListener = this
    }

    // set line pattern and joint type based on current spinner position
    with(mutablePolygon) {
        strokeJointType = getSelectedJointType(strokeJointTypeSpinner.selectedItemPosition)
        strokePattern = getSelectedPattern(strokePatternSpinner.selectedItemPosition)
    }

}
PolygonDemoActivity.kt

Java


public class PolygonDemoActivity extends AppCompatActivity
        implements OnSeekBarChangeListener, OnItemSelectedListener, OnMapReadyCallback {

    private static final LatLng CENTER = new LatLng(-20, 130);
    private static final int MAX_WIDTH_PX = 100;
    private static final int MAX_HUE_DEGREES = 360;
    private static final int MAX_ALPHA = 255;

    private static final int PATTERN_DASH_LENGTH_PX = 50;
    private static final int PATTERN_GAP_LENGTH_PX = 10;
    private static final Dot DOT = new Dot();
    private static final Dash DASH = new Dash(PATTERN_DASH_LENGTH_PX);
    private static final Gap GAP = new Gap(PATTERN_GAP_LENGTH_PX);
    private static final List<PatternItem> PATTERN_DOTTED = Arrays.asList(DOT, GAP);
    private static final List<PatternItem> PATTERN_DASHED = Arrays.asList(DASH, GAP);
    private static final List<PatternItem> PATTERN_MIXED = Arrays.asList(DOT, GAP, DOT, DASH, GAP);

    private Polygon mutablePolygon;
    private SeekBar fillHueBar;
    private SeekBar fillAlphaBar;
    private SeekBar strokeWidthBar;
    private SeekBar strokeHueBar;
    private SeekBar strokeAlphaBar;
    private Spinner strokeJointTypeSpinner;
    private Spinner strokePatternSpinner;
    private CheckBox clickabilityCheckbox;

    // These are the options for polygon stroke joints and patterns. We use their
    // string resource IDs as identifiers.

    private static final int[] JOINT_TYPE_NAME_RESOURCE_IDS = {
            R.string.joint_type_default, // Default
            R.string.joint_type_bevel,
            R.string.joint_type_round,
    };

    private static final int[] PATTERN_TYPE_NAME_RESOURCE_IDS = {
            R.string.pattern_solid, // Default
            R.string.pattern_dashed,
            R.string.pattern_dotted,
            R.string.pattern_mixed,
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.polygon_demo);

        fillHueBar = findViewById(R.id.fillHueSeekBar);
        fillHueBar.setMax(MAX_HUE_DEGREES);
        fillHueBar.setProgress(MAX_HUE_DEGREES / 2);

        fillAlphaBar = findViewById(R.id.fillAlphaSeekBar);
        fillAlphaBar.setMax(MAX_ALPHA);
        fillAlphaBar.setProgress(MAX_ALPHA / 2);

        strokeWidthBar = findViewById(R.id.strokeWidthSeekBar);
        strokeWidthBar.setMax(MAX_WIDTH_PX);
        strokeWidthBar.setProgress(MAX_WIDTH_PX / 3);

        strokeHueBar = findViewById(R.id.strokeHueSeekBar);
        strokeHueBar.setMax(MAX_HUE_DEGREES);
        strokeHueBar.setProgress(0);

        strokeAlphaBar = findViewById(R.id.strokeAlphaSeekBar);
        strokeAlphaBar.setMax(MAX_ALPHA);
        strokeAlphaBar.setProgress(MAX_ALPHA);

        strokeJointTypeSpinner = findViewById(R.id.strokeJointTypeSpinner);
        strokeJointTypeSpinner.setAdapter(new ArrayAdapter<>(
                this, android.R.layout.simple_spinner_item,
                getResourceStrings(JOINT_TYPE_NAME_RESOURCE_IDS)));

        strokePatternSpinner = findViewById(R.id.strokePatternSpinner);
        strokePatternSpinner.setAdapter(new ArrayAdapter<>(
                this, android.R.layout.simple_spinner_item,
                getResourceStrings(PATTERN_TYPE_NAME_RESOURCE_IDS)));

        clickabilityCheckbox = findViewById(R.id.toggleClickability);

        SupportMapFragment mapFragment =
                (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap map) {
        // Override the default content description on the view, for accessibility mode.
        map.setContentDescription(getString(R.string.polygon_demo_description));

        int fillColorArgb = Color.HSVToColor(
                fillAlphaBar.getProgress(), new float[]{fillHueBar.getProgress(), 1, 1});
        int strokeColorArgb = Color.HSVToColor(
                strokeAlphaBar.getProgress(), new float[]{strokeHueBar.getProgress(), 1, 1});

        // Create a rectangle with two rectangular holes.
        mutablePolygon = map.addPolygon(new PolygonOptions()
                .addAll(createRectangle(CENTER, 5, 5))
                .addHole(createRectangle(new LatLng(-22, 128), 1, 1))
                .addHole(createRectangle(new LatLng(-18, 133), 0.5, 1.5))
                .fillColor(fillColorArgb)
                .strokeColor(strokeColorArgb)
                .strokeWidth(strokeWidthBar.getProgress())
                .clickable(clickabilityCheckbox.isChecked()));

        fillHueBar.setOnSeekBarChangeListener(this);
        fillAlphaBar.setOnSeekBarChangeListener(this);

        strokeWidthBar.setOnSeekBarChangeListener(this);
        strokeHueBar.setOnSeekBarChangeListener(this);
        strokeAlphaBar.setOnSeekBarChangeListener(this);

        strokeJointTypeSpinner.setOnItemSelectedListener(this);
        strokePatternSpinner.setOnItemSelectedListener(this);

        mutablePolygon.setStrokeJointType(getSelectedJointType(strokeJointTypeSpinner.getSelectedItemPosition()));
        mutablePolygon.setStrokePattern(getSelectedPattern(strokePatternSpinner.getSelectedItemPosition()));

        // Move the map so that it is centered on the mutable polygon.
        map.moveCamera(CameraUpdateFactory.newLatLngZoom(CENTER, 4));

        // Add a listener for polygon clicks that changes the clicked polygon's stroke color.
        map.setOnPolygonClickListener(new GoogleMap.OnPolygonClickListener() {
            @Override
            public void onPolygonClick(Polygon polygon) {
                // Flip the red, green and blue components of the polygon's stroke color.
                polygon.setStrokeColor(polygon.getStrokeColor() ^ 0x00ffffff);
            }
        });
    }

}
PolygonDemoActivity.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.