Gestire gli eventi
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Questo esempio mostra come ascoltare e gestire alcuni eventi sulla mappa.
Per ulteriori informazioni, consulta la documentazione.
Inizia
Prima di poter provare il codice di esempio, devi configurare il tuo ambiente di sviluppo.
Per ulteriori informazioni, consulta gli esempi di codice di Maps SDK for Android.
Visualizza il codice
Kotlin
class EventsDemoActivity : SamplesBaseActivity(), OnMapClickListener,
OnMapLongClickListener, OnCameraIdleListener, OnMapReadyCallback {
private lateinit var tapTextView: TextView
private lateinit var cameraTextView: TextView
private lateinit var map: GoogleMap
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.events_demo)
tapTextView = findViewById(R.id.tap_text)
cameraTextView = findViewById(R.id.camera_text)
val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
mapFragment?.getMapAsync(this)
applyInsets(findViewById<View?>(R.id.map_container))
}
override fun onMapReady(googleMap: GoogleMap) {
// return early if the map was not initialised properly
map = googleMap
map.setOnMapClickListener(this)
map.setOnMapLongClickListener(this)
map.setOnCameraIdleListener(this)
}
override fun onMapClick(point: LatLng) {
tapTextView.text = "tapped, point=$point"
}
override fun onMapLongClick(point: LatLng) {
tapTextView.text = "long pressed, point=$point"
}
override fun onCameraIdle() {
if (!::map.isInitialized) return
cameraTextView.text = map.cameraPosition.toString()
}
}
Java
public class EventsDemoActivity extends SamplesBaseActivity
implements OnMapClickListener, OnMapLongClickListener, OnCameraIdleListener,
OnMapReadyCallback {
private TextView tapTextView;
private TextView cameraTextView;
private GoogleMap map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(com.example.common_ui.R.layout.events_demo);
tapTextView = findViewById(com.example.common_ui.R.id.tap_text);
cameraTextView = findViewById(com.example.common_ui.R.id.camera_text);
SupportMapFragment mapFragment =
(SupportMapFragment) getSupportFragmentManager().findFragmentById(com.example.common_ui.R.id.map);
mapFragment.getMapAsync(this);
applyInsets(findViewById(com.example.common_ui.R.id.map_container));
}
@Override
public void onMapReady(GoogleMap map) {
this.map = map;
this.map.setOnMapClickListener(this);
this.map.setOnMapLongClickListener(this);
this.map.setOnCameraIdleListener(this);
}
@Override
public void onMapClick(LatLng point) {
tapTextView.setText("tapped, point=" + point);
}
@Override
public void onMapLongClick(LatLng point) {
tapTextView.setText("long pressed, point=" + point);
}
@Override
public void onCameraIdle() {
cameraTextView.setText(map.getCameraPosition().toString());
}
}
Clona ed esegui i sample
Per eseguire questo esempio localmente è necessario Git. Il comando seguente clona il repository dell'applicazione di esempio.
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
- Seleziona Apri. Android Studio compila il progetto utilizzando lo strumento di compilazione Gradle.
- Crea un file
secrets.properties vuoto nella stessa directory del file local.properties del progetto. Per ulteriori informazioni su questo file, consulta Aggiungere la chiave API al progetto.
- Genera una chiave API dal tuo progetto con l'SDK Maps per Android abilitato.
Aggiungi la seguente stringa a secrets.properties, sostituendo YOUR_API_KEY con il valore della tua chiave API:
MAPS_API_KEY=YOUR_API_KEY
- Esegui l'app.
Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
Ultimo aggiornamento 2025-08-31 UTC.
[null,null,["Ultimo aggiornamento 2025-08-31 UTC."],[[["\u003cp\u003eThis example demonstrates how to listen for and respond to map events like clicks, long presses, and camera movements in your Android application.\u003c/p\u003e\n"],["\u003cp\u003eCode samples are provided in both Kotlin and Java, illustrating the implementation of event handling for map interactions.\u003c/p\u003e\n"],["\u003cp\u003eTo run the sample code locally, you'll need to clone the repository, import the project into Android Studio, and configure your development environment with an API key.\u003c/p\u003e\n"],["\u003cp\u003eThe sample code showcases how to register event listeners for clicks, long presses, and camera idleness, allowing you to trigger actions based on user interactions with the map.\u003c/p\u003e\n"]]],[],null,["This example shows how to listen to and handle some events on the map.\n\nFor more information, see the [documentation.](/maps/documentation/android-sdk/events)\n\nGet started\n\nBefore you can try the sample code, you must configure your development environment.\nFor more information, see [Maps SDK for Android code samples](/maps/documentation/android-sdk/examples).\n\nView the code\n\n\nKotlin \n\n```kotlin\nclass EventsDemoActivity : SamplesBaseActivity(), OnMapClickListener,\n OnMapLongClickListener, OnCameraIdleListener, OnMapReadyCallback {\n\n private lateinit var tapTextView: TextView\n private lateinit var cameraTextView: TextView\n private lateinit var map: GoogleMap\n\n override fun onCreate(savedInstanceState: Bundle?) {\n super.onCreate(savedInstanceState)\n setContentView(R.layout.events_demo)\n tapTextView = findViewById(R.id.tap_text)\n cameraTextView = findViewById(R.id.camera_text)\n val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?\n mapFragment?.getMapAsync(this)\n applyInsets(findViewById\u003cView?\u003e(R.id.map_container))\n }\n\n override fun onMapReady(googleMap: GoogleMap) {\n // return early if the map was not initialised properly\n map = googleMap\n map.setOnMapClickListener(this)\n map.setOnMapLongClickListener(this)\n map.setOnCameraIdleListener(this)\n }\n\n override fun onMapClick(point: LatLng) {\n tapTextView.text = \"tapped, point=$point\"\n }\n\n override fun onMapLongClick(point: LatLng) {\n tapTextView.text = \"long pressed, point=$point\"\n }\n\n override fun onCameraIdle() {\n if (!::map.isInitialized) return\n cameraTextView.text = map.cameraPosition.toString()\n }\n}https://github.com/googlemaps-samples/android-samples/blob/73ac16ffca01a2ca6fedd1988c713138ec000082/ApiDemos/project/kotlin-app/src/main/java/com/example/kotlindemos/EventsDemoActivity.kt#L31-L68\n\n \n```\n\nJava \n\n```java\npublic class EventsDemoActivity extends SamplesBaseActivity\n implements OnMapClickListener, OnMapLongClickListener, OnCameraIdleListener,\n OnMapReadyCallback {\n\n private TextView tapTextView;\n private TextView cameraTextView;\n private GoogleMap map;\n\n @Override\n protected void onCreate(Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n setContentView(com.example.common_ui.R.layout.events_demo);\n\n tapTextView = findViewById(com.example.common_ui.R.id.tap_text);\n cameraTextView = findViewById(com.example.common_ui.R.id.camera_text);\n\n SupportMapFragment mapFragment =\n (SupportMapFragment) getSupportFragmentManager().findFragmentById(com.example.common_ui.R.id.map);\n mapFragment.getMapAsync(this);\n applyInsets(findViewById(com.example.common_ui.R.id.map_container));\n }\n\n @Override\n public void onMapReady(GoogleMap map) {\n this.map = map;\n this.map.setOnMapClickListener(this);\n this.map.setOnMapLongClickListener(this);\n this.map.setOnCameraIdleListener(this);\n }\n\n @Override\n public void onMapClick(LatLng point) {\n tapTextView.setText(\"tapped, point=\" + point);\n }\n\n @Override\n public void onMapLongClick(LatLng point) {\n tapTextView.setText(\"long pressed, point=\" + point);\n }\n\n @Override\n public void onCameraIdle() {\n cameraTextView.setText(map.getCameraPosition().toString());\n }\n}https://github.com/googlemaps-samples/android-samples/blob/73ac16ffca01a2ca6fedd1988c713138ec000082/ApiDemos/project/java-app/src/main/java/com/example/mapdemo/EventsDemoActivity.java#L35-L79\n\n \n```\n\n\u003cbr /\u003e\n\nClone and run the samples\n\nGit is required to run this sample locally. The following command clones the sample\napplication repository. \n\n```\ngit clone git@github.com:googlemaps-samples/android-samples.git\n```\n\nImport the sample project into Android Studio:\n\n1. In Android Studio, select **File \\\u003e New \\\u003e Import Project**.\n2. Go to the location where you saved the repository and select the project directory for\n Kotlin or Java:\n\n - **Kotlin** : \u003cvar translate=\"no\"\u003ePATH-REPO\u003c/var\u003e`/android-samples/ApiDemos/kotlin`\n - **Java** : \u003cvar translate=\"no\"\u003ePATH-REPO\u003c/var\u003e`/android-samples/ApiDemos/java`\n3. Select **Open**. Android Studio builds your project, using the Gradle build tool.\n4. Create a blank `secrets.properties` file in the same directory as your project's `local.properties` file. For more information about this file, see [Add your API key to the project](/maps/documentation/android-sdk/config#step_3_add_your_api_key_to_the_project).\n5. [Get an API key](/maps/documentation/android-sdk/get-api-key) from your project with the [Maps SDK for Android enabled](/maps/documentation/android-sdk/cloud-setup#enabling-apis).\n6. Add the following string to `secrets.properties`, replacing **YOUR_API_KEY** with the value of\n your API key:\n\n ```scdoc\n MAPS_API_KEY=YOUR_API_KEY\n ```\n7. Run the app."]]
