[移动开发]Android 集成google地图

在项目中添加谷歌地图

集成前的准备工作，可看上一篇博客Android 集成google地图 准备工作
在app build.gradle中添加下面的sdk，记得启用api

implementation 'com.google.android.gms:play-services-maps:17.0.1'
implementation 'com.google.maps.android:android-maps-utils:2.2.0'

在需要显示地图的地方,在布局中添加如下代码

<fragment
	android:id="@+id/mapview"
	class="com.google.android.gms.maps.SupportMapFragment"
	android:layout_width="match_parent"
	android:layout_height="match_parent"/>

这样就可以显示出google地图来了，不过效果是这样

现在添加个定位，并显示到当前定位来.
在app build.gradle中添加,记得启用这个api

implementation 'com.google.android.gms:play-services-location:15.0.1'

在AndroidManifest.xm中添加如下权限

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

在activityd的onCreate()中添加如下代码

val mapFragment: SupportMapFragment = supportFragmentManager.findFragmentById(R.id.mapview) as SupportMapFragment
mapFragment.getMapAsync(this)
fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this)

实现onMapReady()

override fun onMapReady(p0: GoogleMap) {
	mGoogleMap = p0
	getDeviceLocation()
}

实现获取定位，并移动地图。需要先动态获取定位权限

var locationCallback: LocationCallback? = null
@SuppressLint("MissingPermission")
private fun getDeviceLocation() {
	try {
		val locationRequest = LocationRequest().apply {
	    	interval = 5000
        	fastestInterval = 5000
        	priority = LocationRequest.PRIORITY_HIGH_ACCURACY
		}
		ocationCallback = object: LocationCallback() {
        	override fun onLocationResult(p0: LocationResult?) {
            	if (p0 != null ){
            		//获取到当前位置，将地图移至定位处并将地图放大14倍
                 	mGoogleMap?.moveCamera(CameraUpdateFactory.newLatLngZoom(LatLng(p0.lastLocation.latitude, p0.lastLocation.longitude),14f))
                	mGoogleMap?.uiSettings?.isMyLocationButtonEnabled = false
                	//移除callBack,不然还会继续获取定位
                	fusedLocationProviderClient?.removeLocationUpdates(locationCallback)
                	val bitmap = BitmapFactory.decodeResource(this@GoogleMapDemoActivity.resources,R.drawable.icon_current_location)
                	//清空之前添加的标记
                	mGoogleMap?.clear()
                	//添加当前位置的标记
                	mGoogleMap?.addMarker(MarkerOptions().position(LatLng(lat, lng)).icon(
                    BitmapDescriptorFactory.fromBitmap(bitmap)))
                }   
			}

			override fun onLocationAvailability(p0: LocationAvailability?) {
				//当前定位不可用
	            if (p0?.isLocationAvailable != true){
                	
                }
				fusedLocationProviderClient?.removeLocationUpdates(locationCallback)
			}
		}
		fusedLocationProviderClient?.requestLocationUpdates(locationRequest,locationCallback,
                    Looper.myLooper())
	}catch (e: Exception){

	}
}

运行效果如下

使用Geocoder反向地理编码

private fun latlngToAddress(lat: Double,lng: Double){
	val geocoder = Geocoder(this)
	try {
		val result = geocoder.getFromLocation(lat,lng,1)
		if (result != null && result.isNotEmpty()){
			val addressName = result[0].featureName
		}
	}catch (e: Exception){
           
	}
}