處理點擊事件

選取平台: Android iOS JavaScript

您可讓地圖項目圖層回應使用者的 click 事件,以取得地點 點按界線的 ID 和地圖項目類型。以下地圖範例顯示「Country」圖層的邊界,並列出設定所點選多邊形樣式的事件處理常式,以及顯示與所選國家/地區相關聯的點選多邊形。

編寫點擊事件處理常式

地圖項目圖層上發生點擊事件時,Maps SDK for Android 會傳遞 FeatureClickEvent敬上 傳遞至事件處理常式。使用 FeatureClickEvent 取得緯度 點擊和經緯度座標,以及受限制變更所影響的地圖項目清單 點擊。

處理地圖項目圖層事件

請按照下列步驟處理地圖項目圖層上的事件。在這個範例中,您會為「Country」地圖項目圖層定義點擊事件處理常式,將紅色填充圖案套用至代表所選國家/地區的多邊形。

呼叫 FeatureLayer.setFeatureStyle() 時,樣式工廠函式會設定地圖項目圖層中所有地圖項目的樣式。如要在事件處理常式中更新地圖項目的樣式,您必須 呼叫 FeatureLayer.setFeatureStyle(),將更新後的樣式全部設為 接著介紹網際網路通訊層 包括兩項主要的安全防護功能

  1. 如果您還沒有這樣做,請按照 開始使用 建立新的地圖 ID 和地圖樣式。請務必啟用「Country」(國家/地區) 地圖項目圖層

  2. 請確認您的類別實作 FeatureLayer.OnFeatureClickListener

  3. 呼叫 FeatureLayer.addOnFeatureClickListener()

    Java

    private FeatureLayer countryLayer;
    @Override public void onMapReady(GoogleMap map) {
    // Get the COUNTRY feature layer. countryLayer = map.getFeatureLayer(new FeatureLayerOptions.Builder() .featureType(FeatureType.COUNTRY) .build());
    // Register the click event handler for the Country layer. countryLayer.addOnFeatureClickListener(this);
    // Apply default style to all countries on load to enable clicking. styleCountryLayer(); }
    // Set default fill and border for all countries to ensure that they respond // to click events. private void styleCountryLayer() { FeatureLayer.StyleFactory styleFactory = (Feature feature) -> { return new FeatureStyle.Builder() // Set the fill color for the country as white with a 10% opacity. .fillColor(Color.argb(0.1, 0, 0, 0)) // Set border color to solid black. .strokeColor(Color.BLACK) .build(); };
    // Apply the style factory function to the country feature layer. countryLayer.setFeatureStyle(styleFactory); }

    Kotlin

    private var countryLayer: FeatureLayer? = null
    override fun onMapReady(googleMap: GoogleMap) { // Get the COUNTRY feature layer. countryLayer = googleMap.getFeatureLayer(FeatureLayerOptions.Builder() .featureType(FeatureType.COUNTRY) .build())
    // Register the click event handler for the Country layer. countryLayer?.addOnFeatureClickListener(this)
    // Apply default style to all countries on load to enable clicking. styleCountryLayer() }
    // Set default fill and border for all countries to ensure that they respond // to click events. private fun styleCountryLayer() { val styleFactory = FeatureLayer.StyleFactory { feature: Feature -> return@StyleFactory FeatureStyle.Builder() // Set the fill color for the country as white with a 10% opacity. .fillColor(Color.argb(0.1f, 0f, 0f, 0f)) // Set border color to solid black. .strokeColor(Color.BLACK) .build() }
    // Apply the style factory function to the country feature layer. countryLayer?.setFeatureStyle(styleFactory) }

  4. 為所選國家/地區套用紅色填滿色彩。只有可見的地圖項目可供點選。

    Java

    @Override
    // Define the click event handler.
    public void onFeatureClick(FeatureClickEvent event) {
    // Get the list of features affected by the click using // getPlaceIds() defined below. List<String> selectedPlaceIds = getPlaceIds(event.getFeatures());
    if (!selectedPlaceIds.isEmpty()) { FeatureLayer.StyleFactory styleFactory = (Feature feature) -> { // Use PlaceFeature to get the placeID of the country. if (feature instanceof PlaceFeature) { if (selectedPlaceIds.contains(((PlaceFeature) feature).getPlaceId())) { return new FeatureStyle.Builder() // Set the fill color to red. .fillColor(Color.RED) .build(); } } return null; };
    // Apply the style factory function to the feature layer. countryLayer.setFeatureStyle(styleFactory); } }
    // Get a List of place IDs from the FeatureClickEvent object. private List<String> getPlaceIds(List<Feature> features) { List<String> placeIds = new ArrayList<>(); for (Feature feature : features) { if (feature instanceof PlaceFeature) { placeIds.add(((PlaceFeature) feature).getPlaceId()); } } return placeIds; }

    Kotlin

    // Define the click event handler.
    override fun onFeatureClick(event: FeatureClickEvent) {
    // Get the list of features affected by the click using // getPlaceIds() defined below. val selectedPlaceIds = getPlaceIds(event.getFeatures()) if (!selectedPlaceIds.isEmpty()) { val styleFactory = FeatureLayer.StyleFactory { feature: Feature -> // Use PlaceFeature to get the placeID of the country. if (feature is PlaceFeature) { if (selectedPlaceIds.contains((feature as PlaceFeature).getPlaceId())) { return@StyleFactory FeatureStyle.Builder() // Set the fill color to red. .fillColor(Color.RED) .build() } } return@StyleFactory null }
    // Apply the style factory function to the feature layer. countryLayer?.setFeatureStyle(styleFactory) } }
    // Get a List of place IDs from the FeatureClickEvent object. private fun getPlaceIds(features: List<Feature>): List<String> { val placeIds: MutableList<String> = ArrayList() for (feature in features) { if (feature is PlaceFeature) { placeIds.add((feature as PlaceFeature).getPlaceId()) } } return placeIds }