您可以使用 Maps SDK for Android 監聽地圖上的事件。
程式碼範例
GitHub 上的 ApiDemos 存放區有事件和監聽器的說明範例：
Java
- EventsDemoActivity：地圖點擊和相機變更事件
- CameraDemoActivity：相機變更事件
- CircleDemoActivity：標記點擊和拖曳事件
- GroundOverlayDemoActivity：區域疊加層點擊事件
- IndoorDemoActivity：室內地圖事件
- MarkerDemoActivity：標記和資訊視窗事件
- PolygonDemoActivity：多邊形事件
Kotlin
- EventsDemoActivity：地圖點擊和相機變更事件
- CameraDemoActivity：相機變更事件
- CircleDemoActivity：標記點擊和拖曳事件
- GroundOverlayDemoActivity：區域疊加層點擊事件
- IndoorDemoActivity：室內地圖事件
- MarkerDemoActivity：標記和資訊視窗事件
- PolygonDemoActivity：多邊形事件
地圖點擊/長按事件
您可以使用 OnMapClickListener 回應輕觸地圖上某個地點的使用者，呼叫 GoogleMap.setOnMapClickListener(OnMapClickListener) 則可在地圖上進行設定。使用者按一下 (輕觸) 地圖上某個位置時，您會收到 onMapClick(LatLng) 事件，指出使用者在地圖上點按的位置。請注意，如果您需要在螢幕上顯示對應的位置 (以像素為單位)，可以從地圖取得 Projection，這樣就能在經緯度座標和螢幕像素座標之間進行轉換。
您也可以透過 OnMapLongClickListener 監聽長按事件，呼叫 GoogleMap.setOnMapLongClickListener(OnMapLongClickListener) 則可在地圖上進行設定。這個事件監聽器的運作方式與點擊事件監聽器類似，出現長按事件時，就會收到 onMapLongClick(LatLng) 回呼通知。
在精簡模式中停用點擊事件
如要在精簡模式中停用地圖上的點擊事件，請在包含 MapView 或 MapFragment 的檢視畫面中呼叫 setClickable()。舉例來說，在清單檢視中顯示一或多張地圖時，或是您希望點擊事件叫用與地圖無關的動作時，這項功能就很實用。
停用點擊事件的選項僅適用於精簡模式。停用點擊事件也會使標記無法點擊，但不影響地圖上的其他控制項。
對於 MapView：
Java
MapView mapView = findViewById(R.id.mapView);
mapView.setClickable(false);
Kotlin
val mapView = findViewById<MapView>(R.id.mapView)
mapView.isClickable = false
對於 MapFragment：
Java
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
View view = mapFragment.getView();
view.setClickable(false);
Kotlin
val mapFragment = supportFragmentManager
.findFragmentById(R.id.map) as SupportMapFragment
val view = mapFragment.view
view?.isClickable = false
相機變更事件
地圖檢視是模擬向下俯瞰平面的相機。您可以變更相機的屬性，調整地圖的縮放等級、可視區域和視角。請參閱相機指南。使用者也可用手勢調整相機。
使用相機變更事件監聽器，您就可以追蹤相機的動作。您的應用程式可接收相機動作開始、進行中和結束事件的通知。您也可以查看促使相機移動的「原因」，例如使用者手勢、內建 API 動畫或由開發人員控制的動作。
以下範例說明所有可用的相機事件監聽器：
Java
// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.example.mapdemo;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.CompoundButton;
import android.widget.SeekBar;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.CancelableCallback;
import com.google.android.gms.maps.GoogleMap.OnCameraIdleListener;
import com.google.android.gms.maps.GoogleMap.OnCameraMoveCanceledListener;
import com.google.android.gms.maps.GoogleMap.OnCameraMoveListener;
import com.google.android.gms.maps.GoogleMap.OnCameraMoveStartedListener;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.PolylineOptions;
/**
* This shows how to change the camera position for the map.
*/
public class CameraDemoActivity extends AppCompatActivity implements
OnCameraMoveStartedListener,
OnCameraMoveListener,
OnCameraMoveCanceledListener,
OnCameraIdleListener,
OnMapReadyCallback {
private static final String TAG = CameraDemoActivity.class.getName();
/**
* The amount by which to scroll the camera. Note that this amount is in raw pixels, not dp
* (density-independent pixels).
*/
private static final int SCROLL_BY_PX = 100;
public static final CameraPosition BONDI =
new CameraPosition.Builder().target(new LatLng(-33.891614, 151.276417))
.zoom(15.5f)
.bearing(300)
.tilt(50)
.build();
public static final CameraPosition SYDNEY =
new CameraPosition.Builder().target(new LatLng(-33.87365, 151.20689))
.zoom(15.5f)
.bearing(0)
.tilt(25)
.build();
private GoogleMap map;
private CompoundButton animateToggle;
private CompoundButton customDurationToggle;
private SeekBar customDurationBar;
private PolylineOptions currPolylineOptions;
private boolean isCanceled = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.camera_demo);
animateToggle = findViewById(R.id.animate);
customDurationToggle = findViewById(R.id.duration_toggle);
customDurationBar = findViewById(R.id.duration_bar);
updateEnabledState();
SupportMapFragment mapFragment =
(SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
protected void onResume() {
super.onResume();
updateEnabledState();
}
@Override
public void onMapReady(GoogleMap googleMap) {
map = googleMap;
map.setOnCameraIdleListener(this);
map.setOnCameraMoveStartedListener(this);
map.setOnCameraMoveListener(this);
map.setOnCameraMoveCanceledListener(this);
// We will provide our own zoom controls.
map.getUiSettings().setZoomControlsEnabled(false);
map.getUiSettings().setMyLocationButtonEnabled(true);
// Show Sydney
map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(-33.87365, 151.20689), 10));
}
/**
* When the map is not ready the CameraUpdateFactory cannot be used. This should be called on
* all entry points that call methods on the Google Maps API.
*/
private boolean checkReady() {
if (map == null) {
Toast.makeText(this, R.string.map_not_ready, Toast.LENGTH_SHORT).show();
return false;
}
return true;
}
/**
* Called when the Go To Bondi button is clicked.
*/
public void onGoToBondi(View view) {
if (!checkReady()) {
return;
}
changeCamera(CameraUpdateFactory.newCameraPosition(BONDI));
}
/**
* Called when the Animate To Sydney button is clicked.
*/
public void onGoToSydney(View view) {
if (!checkReady()) {
return;
}
changeCamera(CameraUpdateFactory.newCameraPosition(SYDNEY), new CancelableCallback() {
@Override
public void onFinish() {
Toast.makeText(getBaseContext(), "Animation to Sydney complete", Toast.LENGTH_SHORT)
.show();
}
@Override
public void onCancel() {
Toast.makeText(getBaseContext(), "Animation to Sydney canceled", Toast.LENGTH_SHORT)
.show();
}
});
}
/**
* Called when the stop button is clicked.
*/
public void onStopAnimation(View view) {
if (!checkReady()) {
return;
}
map.stopAnimation();
}
/**
* Called when the zoom in button (the one with the +) is clicked.
*/
public void onZoomIn(View view) {
if (!checkReady()) {
return;
}
changeCamera(CameraUpdateFactory.zoomIn());
}
/**
* Called when the zoom out button (the one with the -) is clicked.
*/
public void onZoomOut(View view) {
if (!checkReady()) {
return;
}
changeCamera(CameraUpdateFactory.zoomOut());
}
/**
* Called when the tilt more button (the one with the /) is clicked.
*/
public void onTiltMore(View view) {
if (!checkReady()) {
return;
}
CameraPosition currentCameraPosition = map.getCameraPosition();
float currentTilt = currentCameraPosition.tilt;
float newTilt = currentTilt + 10;
newTilt = (newTilt > 90) ? 90 : newTilt;
CameraPosition cameraPosition = new CameraPosition.Builder(currentCameraPosition)
.tilt(newTilt).build();
changeCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
/**
* Called when the tilt less button (the one with the \) is clicked.
*/
public void onTiltLess(View view) {
if (!checkReady()) {
return;
}
CameraPosition currentCameraPosition = map.getCameraPosition();
float currentTilt = currentCameraPosition.tilt;
float newTilt = currentTilt - 10;
newTilt = (newTilt > 0) ? newTilt : 0;
CameraPosition cameraPosition = new CameraPosition.Builder(currentCameraPosition)
.tilt(newTilt).build();
changeCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
/**
* Called when the left arrow button is clicked. This causes the camera to move to the left
*/
public void onScrollLeft(View view) {
if (!checkReady()) {
return;
}
changeCamera(CameraUpdateFactory.scrollBy(-SCROLL_BY_PX, 0));
}
/**
* Called when the right arrow button is clicked. This causes the camera to move to the right.
*/
public void onScrollRight(View view) {
if (!checkReady()) {
return;
}
changeCamera(CameraUpdateFactory.scrollBy(SCROLL_BY_PX, 0));
}
/**
* Called when the up arrow button is clicked. The causes the camera to move up.
*/
public void onScrollUp(View view) {
if (!checkReady()) {
return;
}
changeCamera(CameraUpdateFactory.scrollBy(0, -SCROLL_BY_PX));
}
/**
* Called when the down arrow button is clicked. This causes the camera to move down.
*/
public void onScrollDown(View view) {
if (!checkReady()) {
return;
}
changeCamera(CameraUpdateFactory.scrollBy(0, SCROLL_BY_PX));
}
/**
* Called when the animate button is toggled
*/
public void onToggleAnimate(View view) {
updateEnabledState();
}
/**
* Called when the custom duration checkbox is toggled
*/
public void onToggleCustomDuration(View view) {
updateEnabledState();
}
/**
* Update the enabled state of the custom duration controls.
*/
private void updateEnabledState() {
customDurationToggle.setEnabled(animateToggle.isChecked());
customDurationBar
.setEnabled(animateToggle.isChecked() && customDurationToggle.isChecked());
}
private void changeCamera(CameraUpdate update) {
changeCamera(update, null);
}
/**
* Change the camera position by moving or animating the camera depending on the state of the
* animate toggle button.
*/
private void changeCamera(CameraUpdate update, CancelableCallback callback) {
if (animateToggle.isChecked()) {
if (customDurationToggle.isChecked()) {
int duration = customDurationBar.getProgress();
// The duration must be strictly positive so we make it at least 1.
map.animateCamera(update, Math.max(duration, 1), callback);
} else {
map.animateCamera(update, callback);
}
} else {
map.moveCamera(update);
}
}
@Override
public void onCameraMoveStarted(int reason) {
if (!isCanceled) {
map.clear();
}
String reasonText = "UNKNOWN_REASON";
currPolylineOptions = new PolylineOptions().width(5);
switch (reason) {
case OnCameraMoveStartedListener.REASON_GESTURE:
currPolylineOptions.color(Color.BLUE);
reasonText = "GESTURE";
break;
case OnCameraMoveStartedListener.REASON_API_ANIMATION:
currPolylineOptions.color(Color.RED);
reasonText = "API_ANIMATION";
break;
case OnCameraMoveStartedListener.REASON_DEVELOPER_ANIMATION:
currPolylineOptions.color(Color.GREEN);
reasonText = "DEVELOPER_ANIMATION";
break;
}
Log.d(TAG, "onCameraMoveStarted(" + reasonText + ")");
addCameraTargetToPath();
}
@Override
public void onCameraMove() {
// When the camera is moving, add its target to the current path we'll draw on the map.
if (currPolylineOptions != null) {
addCameraTargetToPath();
}
Log.d(TAG, "onCameraMove");
}
@Override
public void onCameraMoveCanceled() {
// When the camera stops moving, add its target to the current path, and draw it on the map.
if (currPolylineOptions != null) {
addCameraTargetToPath();
map.addPolyline(currPolylineOptions);
}
isCanceled = true; // Set to clear the map when dragging starts again.
currPolylineOptions = null;
Log.d(TAG, "onCameraMoveCancelled");
}
@Override
public void onCameraIdle() {
if (currPolylineOptions != null) {
addCameraTargetToPath();
map.addPolyline(currPolylineOptions);
}
currPolylineOptions = null;
isCanceled = false; // Set to *not* clear the map when dragging starts again.
Log.d(TAG, "onCameraIdle");
}
private void addCameraTargetToPath() {
LatLng target = map.getCameraPosition().target;
currPolylineOptions.add(target);
}
}
Kotlin
/*
* Copyright 2018 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.kotlindemos
import android.graphics.Color
import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.CompoundButton
import android.widget.SeekBar
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.google.android.gms.maps.CameraUpdate
import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.GoogleMap.CancelableCallback
import com.google.android.gms.maps.GoogleMap.OnCameraIdleListener
import com.google.android.gms.maps.GoogleMap.OnCameraMoveCanceledListener
import com.google.android.gms.maps.GoogleMap.OnCameraMoveListener
import com.google.android.gms.maps.GoogleMap.OnCameraMoveStartedListener
import com.google.android.gms.maps.OnMapReadyCallback
import com.google.android.gms.maps.SupportMapFragment
import com.google.android.gms.maps.model.CameraPosition
import com.google.android.gms.maps.model.LatLng
import com.google.android.gms.maps.model.PolylineOptions
/**
* This shows how to change the camera position for the map.
*/
class CameraDemoActivity :
AppCompatActivity(),
OnCameraMoveStartedListener,
OnCameraMoveListener,
OnCameraMoveCanceledListener,
OnCameraIdleListener,
OnMapReadyCallback {
/**
* The amount by which to scroll the camera. Note that this amount is in raw pixels, not dp
* (density-independent pixels).
*/
private val SCROLL_BY_PX = 100
private val TAG = CameraDemoActivity::class.java.name
private val sydneyLatLng = LatLng(-33.87365, 151.20689)
private val bondiLocation: CameraPosition = CameraPosition.Builder()
.target(LatLng(-33.891614, 151.276417))
.zoom(15.5f)
.bearing(300f)
.tilt(50f)
.build()
private val sydneyLocation: CameraPosition = CameraPosition.Builder().
target(LatLng(-33.87365, 151.20689))
.zoom(15.5f)
.bearing(0f)
.tilt(25f)
.build()
private lateinit var map: GoogleMap
private lateinit var animateToggle: CompoundButton
private lateinit var customDurationToggle: CompoundButton
private lateinit var customDurationBar: SeekBar
private var currPolylineOptions: PolylineOptions? = null
private var isCanceled = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.camera_demo)
animateToggle = findViewById(R.id.animate)
customDurationToggle = findViewById(R.id.duration_toggle)
customDurationBar = findViewById(R.id.duration_bar)
updateEnabledState()
val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment
mapFragment.getMapAsync(this)
}
override fun onResume() {
super.onResume()
updateEnabledState()
}
override fun onMapReady(googleMap: GoogleMap) {
map = googleMap
// return early if the map was not initialised properly
with(googleMap) {
setOnCameraIdleListener(this@CameraDemoActivity)
setOnCameraMoveStartedListener(this@CameraDemoActivity)
setOnCameraMoveListener(this@CameraDemoActivity)
setOnCameraMoveCanceledListener(this@CameraDemoActivity)
// We will provide our own zoom controls.
uiSettings.isZoomControlsEnabled = false
uiSettings.isMyLocationButtonEnabled = true
// Show Sydney
moveCamera(CameraUpdateFactory.newLatLngZoom(sydneyLatLng, 10f))
}
}
/**
* When the map is not ready the CameraUpdateFactory cannot be used. This should be used to wrap
* all entry points that call methods on the Google Maps API.
*
* @param stuffToDo the code to be executed if the map is initialised
*/
private fun checkReadyThen(stuffToDo: () -> Unit) {
if (!::map.isInitialized) {
Toast.makeText(this, R.string.map_not_ready, Toast.LENGTH_SHORT).show()
} else {
stuffToDo()
}
}
/**
* Called when the Go To Bondi button is clicked.
*/
@Suppress("UNUSED_PARAMETER")
fun onGoToBondi(view: View) {
checkReadyThen {
changeCamera(CameraUpdateFactory.newCameraPosition(bondiLocation))
}
}
/**
* Called when the Animate To Sydney button is clicked.
*/
@Suppress("UNUSED_PARAMETER")
fun onGoToSydney(view: View) {
checkReadyThen {
changeCamera(CameraUpdateFactory.newCameraPosition(sydneyLocation),
object : CancelableCallback {
override fun onFinish() {
Toast.makeText(baseContext, "Animation to Sydney complete",
Toast.LENGTH_SHORT).show()
}
override fun onCancel() {
Toast.makeText(baseContext, "Animation to Sydney canceled",
Toast.LENGTH_SHORT).show()
}
})
}
}
/**
* Called when the stop button is clicked.
*/
@Suppress("UNUSED_PARAMETER")
fun onStopAnimation(view: View) = checkReadyThen { map.stopAnimation() }
/**
* Called when the zoom in button (the one with the +) is clicked.
*/
@Suppress("UNUSED_PARAMETER")
fun onZoomIn(view: View) = checkReadyThen { changeCamera(CameraUpdateFactory.zoomIn()) }
/**
* Called when the zoom out button (the one with the -) is clicked.
*/
@Suppress("UNUSED_PARAMETER")
fun onZoomOut(view: View) = checkReadyThen { changeCamera(CameraUpdateFactory.zoomOut()) }
/**
* Called when the tilt more button (the one with the /) is clicked.
*/
@Suppress("UNUSED_PARAMETER")
fun onTiltMore(view: View) {
checkReadyThen {
val newTilt = Math.min(map.cameraPosition.tilt + 10, 90F)
val cameraPosition = CameraPosition.Builder(map.cameraPosition).tilt(newTilt).build()
changeCamera(CameraUpdateFactory.newCameraPosition(cameraPosition))
}
}
/**
* Called when the tilt less button (the one with the \) is clicked.
*/
@Suppress("UNUSED_PARAMETER")
fun onTiltLess(view: View) {
checkReadyThen {
val newTilt = Math.max(map.cameraPosition.tilt - 10, 0F)
val cameraPosition = CameraPosition.Builder(map.cameraPosition).tilt(newTilt).build()
changeCamera(CameraUpdateFactory.newCameraPosition(cameraPosition))
}
}
/**
* Called when the left arrow button is clicked. This causes the camera to move to the left
*/
@Suppress("UNUSED_PARAMETER")
fun onScrollLeft(view: View) {
checkReadyThen {
changeCamera(CameraUpdateFactory.scrollBy((-SCROLL_BY_PX).toFloat(),0f))
}
}
/**
* Called when the right arrow button is clicked. This causes the camera to move to the right.
*/
@Suppress("UNUSED_PARAMETER")
fun onScrollRight(view: View) {
checkReadyThen {
changeCamera(CameraUpdateFactory.scrollBy(SCROLL_BY_PX.toFloat(), 0f))
}
}
/**
* Called when the up arrow button is clicked. The causes the camera to move up.
*/
@Suppress("UNUSED_PARAMETER")
fun onScrollUp(view: View) {
checkReadyThen {
changeCamera(CameraUpdateFactory.scrollBy(0f, (-SCROLL_BY_PX).toFloat()))
}
}
/**
* Called when the down arrow button is clicked. This causes the camera to move down.
*/
@Suppress("UNUSED_PARAMETER")
fun onScrollDown(view: View) {
checkReadyThen {
changeCamera(CameraUpdateFactory.scrollBy(0f, SCROLL_BY_PX.toFloat()))
}
}
/**
* Called when the animate button is toggled
*/
@Suppress("UNUSED_PARAMETER")
fun onToggleAnimate(view: View) = updateEnabledState()
/**
* Called when the custom duration checkbox is toggled
*/
@Suppress("UNUSED_PARAMETER")
fun onToggleCustomDuration(view: View) = updateEnabledState()
/**
* Update the enabled state of the custom duration controls.
*/
private fun updateEnabledState() {
customDurationToggle.isEnabled = animateToggle.isChecked
customDurationBar.isEnabled = animateToggle.isChecked && customDurationToggle.isChecked
}
/**
* Change the camera position by moving or animating the camera depending on the state of the
* animate toggle button.
*/
private fun changeCamera(update: CameraUpdate, callback: CancelableCallback? = null) {
if (animateToggle.isChecked) {
if (customDurationToggle.isChecked) {
// The duration must be strictly positive so we make it at least 1.
map.animateCamera(update, Math.max(customDurationBar.progress, 1), callback)
} else {
map.animateCamera(update, callback)
}
} else {
map.moveCamera(update)
}
}
override fun onCameraMoveStarted(reason: Int) {
if (!isCanceled) map.clear()
var reasonText = "UNKNOWN_REASON"
currPolylineOptions = PolylineOptions().width(5f)
when (reason) {
OnCameraMoveStartedListener.REASON_GESTURE -> {
currPolylineOptions?.color(Color.BLUE)
reasonText = "GESTURE"
}
OnCameraMoveStartedListener.REASON_API_ANIMATION -> {
currPolylineOptions?.color(Color.RED)
reasonText = "API_ANIMATION"
}
OnCameraMoveStartedListener.REASON_DEVELOPER_ANIMATION -> {
currPolylineOptions?.color(Color.GREEN)
reasonText = "DEVELOPER_ANIMATION"
}
}
Log.d(TAG, "onCameraMoveStarted($reasonText)")
addCameraTargetToPath()
}
/**
* Ensures that currPolyLine options is not null before accessing it
*
* @param stuffToDo the code to be executed if currPolylineOptions is not null
*/
private fun checkPolylineThen(stuffToDo: () -> Unit) {
if (currPolylineOptions != null) stuffToDo()
}
override fun onCameraMove() {
Log.d(TAG, "onCameraMove")
// When the camera is moving, add its target to the current path we'll draw on the map.
checkPolylineThen { addCameraTargetToPath() }
}
override fun onCameraMoveCanceled() {
// When the camera stops moving, add its target to the current path, and draw it on the map.
checkPolylineThen {
addCameraTargetToPath()
map.addPolyline(currPolylineOptions!!)
}
isCanceled = true // Set to clear the map when dragging starts again.
currPolylineOptions = null
Log.d(TAG, "onCameraMoveCancelled")
}
override fun onCameraIdle() {
checkPolylineThen {
addCameraTargetToPath()
map.addPolyline(currPolylineOptions!!)
}
currPolylineOptions = null
isCanceled = false // Set to *not* clear the map when dragging starts again.
Log.d(TAG, "onCameraIdle")
}
private fun addCameraTargetToPath() {
currPolylineOptions?.add(map.cameraPosition.target)
}
}
您可以使用下列相機事件監聽器：
相機開始移動時，系統會叫用
OnCameraMoveStartedListener的onCameraMoveStarted()回呼，回呼方法則會接收相機動作的reason。原因可能是下列其中一項：REASON_GESTURE表示相機因回應使用者地圖上的手勢而移動，這類手勢包括平移、傾斜、雙指撥動縮放或旋轉地圖等。REASON_API_ANIMATION表示 API 為回應使用者的非手勢動作而移動相機 (非手勢動作如輕觸縮放按鈕、輕觸「我的位置」按鈕或點選標記)。REASON_DEVELOPER_ANIMATION表示應用程式啟動了相機動作。
使用者與觸控螢幕進行互動或相機移動時，系統會多次叫用
OnCameraMoveListener的onCameraMove()回呼。API 會在每個頁框叫用回呼一次，瞭解這一點能幫助您掌握系統叫用回呼的頻率。不過請注意，這個回呼是以非同步方式叫用，因此會與螢幕上顯示的內容不同步。此外也請注意，在一個onCameraMove()回呼和下一個回呼之間，相機位置可能會維持不變。當相機停止移動且使用者停止與地圖互動時，系統會叫用
OnCameraIdleListener的OnCameraIdle()回呼。目前的相機動作中斷時，系統會叫用
OnCameraMoveCanceledListener的OnCameraMoveCanceled()回呼。在OnCameraMoveCanceled()回呼之後，系統會立即使用新的reason叫用onCameraMoveStarted()回呼。如果您的應用程式明確呼叫
GoogleMap.stopAnimation()，系統會叫用OnCameraMoveCanceled()回呼，但不會叫用onCameraMoveStarted()回呼。
如要在地圖上設定事件監聽器，請呼叫相關設定方法。
舉例來說，如要向 OnCameraMoveStartedListener 要求回呼，請呼叫 GoogleMap.setOnCameraMoveStartedListener()。
您可以從 CameraPosition 取得相機的目標 (緯度/經度)、縮放、方位和傾斜角度。如要進一步瞭解這些屬性，請參閱相機位置指南。
商家和其他搜尋點的事件
根據預設，搜尋點與對應的圖示會一併顯示在基本地圖上。搜尋點包括公園、學校、政府大樓等，也包括像商店、餐廳和飯店等商家搜尋點。
您可以回應搜尋點上的點擊事件。請參閱商家和其他搜尋點指南。
室內地圖事件
您可以使用事件來尋找及自訂室內地圖的顯示樓層。如要在對焦新的建築物或啟用建築物的其他樓層時呼叫事件監聽器，可以使用 OnIndoorStateChangeListener 介面設定事件監聽器。
呼叫 GoogleMap.getFocusedBuilding() 可存取目前要檢視的建築物。
將地圖中心置於特定經緯度時，通常會顯示該經緯度的建築物 (但不保證會如此)。
接著，您可以呼叫 IndoorBuilding.getActiveLevelIndex() 來尋找顯示樓層。
Java
IndoorBuilding building = map.getFocusedBuilding();
if (building != null) {
int activeLevelIndex = building.getActiveLevelIndex();
IndoorLevel activeLevel = building.getLevels().get(activeLevelIndex);
}
Kotlin
map.focusedBuilding?.let { building: IndoorBuilding ->
val activeLevelIndex = building.activeLevelIndex
val activeLevel = building.levels[activeLevelIndex]
}
如要展現顯示樓層的自訂標記 (例如標記、區域疊加層、圖塊疊加層、多邊形、折線和其他形狀)，這項做法就很實用。
提示：如要返回街景，請透過 IndoorBuilding.getDefaultLevelIndex() 取得預設樓層，並透過 IndoorLevel.activate() 將其設為顯示樓層。
標記和資訊視窗事件
您可以針對標記所屬的 GoogleMap 物件設定對應的事件監聽器，藉此監聽並回應標記事件 (包括標記點擊和拖曳事件)。請參閱標記事件指南。
您也可以監聽資訊視窗中的事件。
形狀和疊加層事件
您可以監聽並回應折線、多邊形、圓形和區域疊加層上的點擊事件。
位置事件
應用程式可以回應下列與「我的位置」圖層相關的事件：
- 如果使用者按下「我的位置」按鈕，應用程式就會收到來自
GoogleMap.OnMyLocationButtonClickListener的onMyLocationButtonClick()回呼。 - 如果使用者按下「我的位置」藍點，應用程式就會收到來自
GoogleMap.OnMyLocationClickListener的onMyLocationClick()回呼。
詳情請參閱我的位置圖層指南。