利用 Maps SDK for Android，您可以监听地图上的事件。
代码示例
GitHub 上的 ApiDemos 代码库包含展示事件和监听器的相关示例：
Kotlin
- EventsDemoActivity：地图点击和镜头更改事件
- CameraDemoActivity：镜头更改事件
- CircleDemoActivity：标记点击和拖动事件
- GroundOverlayDemoActivity：地面叠加层点击事件
- IndoorDemoActivity：室内地图事件
- MarkerDemoActivity：标记和信息窗口事件
- PolygonDemoActivity：多边形事件
Java
- EventsDemoActivity：地图点击和镜头更改事件
- CameraDemoActivity：镜头更改事件
- CircleDemoActivity：标记点击和拖动事件
- GroundOverlayDemoActivity：地面叠加层点击事件
- IndoorDemoActivity：室内地图事件
- MarkerDemoActivity：标记和信息窗口事件
- PolygonDemoActivity：多边形事件
地图点击/长按事件
如果您想对用户点按地图上某一点的操作作出响应，可以使用 OnMapClickListener（可通过调用 GoogleMap.setOnMapClickListener(OnMapClickListener) 在地图上进行设置）。用户在地图上点击（点按）某个位置时，您会收到一个 onMapClick(LatLng) 事件，指示用户在地图上点击的位置。请注意，如果您需要获取屏幕上的对应位置（以像素表示），可以从地图中获取 Projection，用以在纬度/经度坐标与屏幕像素坐标之间进行转换。
您还可以使用 OnMapLongClickListener（可通过调用 GoogleMap.setOnMapLongClickListener(OnMapLongClickListener) 在地图上进行设置）监听长按事件。该监听器的运行方式与点击监听器类似，当发生长按事件时，系统会通过 onMapLongClick(LatLng) 回调通知该监听器。
在精简模式下停用点击事件
如要停用精简模式地图上的点击事件，请对包含 MapView 或 MapFragment 的视图调用 setClickable()。例如，在列表视图下显示地图时，如果您想让点击事件调用与地图无关的操作，停用点击事件就很有用。
仅在精简模式下才提供停用点击事件的选项。停用点击事件还会使标记变为无法点击，但不会影响地图上的其他控件。
对于 MapView：
Kotlin
val mapView = findViewById<MapView>(R.id.mapView)
mapView.isClickable = false
Java
MapView mapView = findViewById(R.id.mapView);
mapView.setClickable(false);
对于 MapFragment：
Kotlin
val mapFragment = supportFragmentManager
.findFragmentById(R.id.map) as SupportMapFragment
val view = mapFragment.view
view?.isClickable = false
Java
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
View view = mapFragment.getView();
view.setClickable(false);
镜头更改事件
地图视图被建模成一个俯视某个平面的镜头。您可以通过更改镜头的属性来改变地图的缩放级别、视口和视角。请参阅有关镜头的指南。用户还可以通过做手势来影响镜头。
您可以使用镜头更改监听器来跟踪镜头的移动情况。您的应用可以接收有关镜头移动开始、持续和结束事件的通知。您还可以了解镜头移动的原因，例如用户手势、内置 API 动画或开发者控制的移动操作。
以下示例展示了所有可用的镜头事件监听器：
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)
}
}
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);
}
}
有以下镜头监听器可供使用：
当镜头开始移动时，系统会调用
OnCameraMoveStartedListener的onCameraMoveStarted()回调函数。此回调方法将收到表示镜头移动原因的reason。原因可能为以下其中一项：REASON_GESTURE表示镜头移动是为了响应用户在地图上做出的手势，如平移、倾斜、旋转地图或通过双指张合进行缩放。REASON_API_ANIMATION表示 API 移动镜头是为了响应用户的非手势操作，如点按缩放按钮、点按“我的位置”按钮或点击标记。REASON_DEVELOPER_ANIMATION表示是您的应用启动了镜头移动操作。
当镜头正在移动或用户正与触摸屏互动时，系统会多次调用
OnCameraMoveListener的onCameraMove()回调函数。API 会针对每个帧调用一次回调函数，知道这一点有助于确定回调函数的调用频率。但请注意，此回调函数是异步调用的，因此，它与屏幕上显示的内容不同步。还需要注意的是，在一次onCameraMove()回调与下一次回调之间，镜头位置有可能保持不变。当镜头停止移动且用户已停止与地图互动时，系统将调用
OnCameraIdleListener的OnCameraIdle()回调函数。在当前镜头移动已中断时，系统将调用
OnCameraMoveCanceledListener的OnCameraMoveCanceled()回调函数。调用OnCameraMoveCanceled()回调函数之后，系统会立即使用新的reason调用onCameraMoveStarted()回调函数。如果您的应用明确调用
GoogleMap.stopAnimation()，则系统将调用OnCameraMoveCanceled()回调函数，但不会调用onCameraMoveStarted()回调函数。
如需在地图上设置监听器，请调用相关的监听器设置方法。例如，如需从 OnCameraMoveStartedListener 请求回调，请调用 GoogleMap.setOnCameraMoveStartedListener()。
您可以从 CameraPosition 获取镜头的目标（纬度/经度）、缩放级别、方向角及倾斜度。如需详细了解这些属性，请参阅有关镜头位置的指南。
商家地图注点及其他地图注点上的事件
默认情况下，地图注点 (POI) 将与对应的图标一起显示在基本地图上。地图注点包括公园、学校、政府大楼等，以及商店、餐馆和酒店等商家地图注点。
您可以响应地图注点上的点击事件。请参阅有关商家和其他地图注点的指南。
室内地图事件
您可以利用事件来查找和自定义室内地图的活动楼层。使用 OnIndoorStateChangeListener 接口可设置在一栋新建筑物获得焦点或者激活建筑物内的新楼层时要调用的监听器。
通过调用 GoogleMap.getFocusedBuilding() 可获取当前获得焦点的建筑物的信息。一般而言，让地图以特定纬度/经度为中心可让您获得位于该纬度/经度的建筑物的信息，但不能保证做到。
然后，您可以通过调用 IndoorBuilding.getActiveLevelIndex() 找到当前的活动楼层。
Kotlin
map.focusedBuilding?.let { building: IndoorBuilding ->
val activeLevelIndex = building.activeLevelIndex
val activeLevel = building.levels[activeLevelIndex]
}
Java
IndoorBuilding building = map.getFocusedBuilding();
if (building != null) {
int activeLevelIndex = building.getActiveLevelIndex();
IndoorLevel activeLevel = building.getLevels().get(activeLevelIndex);
}
如果您想为活动楼层显示自定义标记，如标记、地面叠加层、图块叠加层、多边形、多段线以及其他形状，便可执行该调用。
提示：如需返回街道层，请通过 IndoorBuilding.getDefaultLevelIndex() 获取默认楼层，然后通过 IndoorLevel.activate() 将其设置为活动楼层。
标记和信息窗口事件
您可以在标记所属的 GoogleMap 对象上设置相应的监听器，以此监听和响应标记事件，包括标记点击和拖动事件。请参阅有关标记事件的指南。
您还可以监听信息窗口上的事件。
形状和叠加层事件
您可以监听和响应多段线、多边形、圆形和地面叠加层上的点击事件。
位置事件
您的应用可以响应以下与“我的位置”图层相关的事件：
- 如果用户点击“我的位置”按钮，您的应用会收到来自
GoogleMap.OnMyLocationButtonClickListener的onMyLocationButtonClick()回调。 - 如果用户点击“我的位置”蓝点，您的应用会收到来自
GoogleMap.OnMyLocationClickListener的onMyLocationClick()回调。
如需了解详情，请参阅有关“我的位置”图层的指南。