Kotlin Android Google地图搜索位置 KotlinAndroidGoogle地图搜索位置

在上一教程中, 我们构建了定位地图固定位置和地图当前位置的应用程序。
在本教程中, 我们将在Google Map中实现搜索位置功能。 Google位置的搜索是通过Geocoder类完成的。 Geocoder类有助于地理编码和反向地理编码。
地理编码是将街道地址转换为坐标（纬度, 经度）的过程。反向地理编码是将坐标（纬度, 经度）转换为街道地址的过程。
Geocoder类的方法

List getFromLocation（double latitude, double longitude, int maxResults）：此方法返回一个Address数组, 该数组指定周围的纬度和经度。
列表getFromLocationName（String location, int results, double leftLatitude, double leftLongitude, double rightLatitude, double rightLongitude）：此方法返回一个Address数组, 该数组描述了给定的位置, 例如位置, 地址等。
List getFromLocationName（String location, int results）：此方法返回一个Address数组, 该数组描述给定的位置, 例如位置, 地址等。
static boolean isPresent()：如果实现了方法getFromLocation()和getFromLocationName(), 则此方法返回true。

activity_maps.xml
将以下代码添加到activity_maps.xml布局文件中。 EditText用于输入搜索位置, 而Button用于单击事件以搜索位置。

< fragment xmlns:android="http://schemas.android.com/apk/res/android"xmlns:map="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/map"android:name="com.google.android.gms.maps.SupportMapFragment"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="example.srcmini.com.kotlingooglesearchlocation.MapsActivity" > < LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"> < EditTextandroid:layout_width="248dp"android:layout_height="wrap_content"android:id="@+id/editText"android:layout_weight="0.5"android:inputType="textPersonName"android:hint="Search Location" /> < Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="0.5"android:onClick="searchLocation"android:text="Search" /> < /LinearLayout> < /fragment>

build.gradle
【Kotlin Android Google地图搜索位置】在build.gradle文件中添加Google Map Service和Google Location Service依赖项。

dependencies {implementation fileTree(dir: 'libs', include: ['*.jar'])implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"implementation 'com.android.support:appcompat-v7:26.1.0'implementation 'com.google.android.gms:play-services-maps:11.8.0'compile 'com.google.android.gms:play-services-location:11.8.0'testImplementation 'junit:junit:4.12'testImplementation 'junit:junit:4.12'}

strings.xml

< resources> < string name="app_name"> Kotlin Google Search Location< /string> < string name="title_activity_maps"> Google Search Location< /string> < /resources>

google_map_api.xml
将Google Map API密钥放置在res / values / google_map_api.xml文件中。

< resources> < !--https://console.developers.google.com/flows/enableapi?apiid=maps_android_backend&keyType=CLIENT_SIDE_ANDROID&r=20:0B:71:3B:B2:46:75:A1:87:78:2E:4C:49:3F:E3:B6:FD:2D:76:D3%3Bexample.srcmini.com.kotlingooglesearchlocationAlternatively, follow the directions here:https://developers.google.com/maps/documentation/android/start#get-keyOnce you have your key (it starts with "AIza"), replace the "google_maps_key"string in this file.--> < string name="google_maps_key" templateMergeStrategy="preserve" translatable="false"> AIzaSyCKvLn2KTPKD_-REPLACE-WITH-YOUR-API< /string> < /resources>

MapsActivity.kt
在MapsActivity.kt类文件中添加以下代码。

package example.srcmini.com.kotlingooglesearchlocationimport android.os.Bundleimport com.google.android.gms.maps.CameraUpdateFactoryimport com.google.android.gms.maps.GoogleMapimport com.google.android.gms.maps.OnMapReadyCallbackimport com.google.android.gms.maps.SupportMapFragmentimport com.google.android.gms.maps.model.LatLngimport com.google.android.gms.maps.model.MarkerOptionsimport android.location.Addressimport android.location.Geocoderimport android.os.Buildimport android.support.v4.app.FragmentActivityimport com.google.android.gms.common.api.GoogleApiClientimport com.google.android.gms.maps.model.BitmapDescriptorFactoryimport com.google.android.gms.maps.model.Markerimport com.google.android.gms.location.LocationServicesimport android.location.Locationimport android.Manifestimport android.content.pm.PackageManagerimport android.support.v4.content.ContextCompatimport android.view.Viewimport android.widget.EditTextimport android.widget.Toastimport com.google.android.gms.common.ConnectionResultimport com.google.android.gms.location.LocationListenerimport com.google.android.gms.location.LocationRequestimport java.io.IOExceptionclass MapsActivity() : FragmentActivity(), OnMapReadyCallback, LocationListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {private var mMap: GoogleMap? = nullinternal lateinit var mLastLocation: Locationinternal var mCurrLocationMarker: Marker? = nullinternal var mGoogleApiClient: GoogleApiClient? = nullinternal lateinit var mLocationRequest: LocationRequestoverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_maps)// Obtain the SupportMapFragment and get notified when the map is ready to be used.val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragmentmapFragment.getMapAsync(this)}override fun onMapReady(googleMap: GoogleMap) {mMap = googleMapif (android.os.Build.VERSION.SDK_INT > = Build.VERSION_CODES.M) {if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {buildGoogleApiClient()mMap!!.isMyLocationEnabled = true}} else {buildGoogleApiClient()mMap!!.isMyLocationEnabled = true}}@Synchronizedprotected fun buildGoogleApiClient() {mGoogleApiClient = GoogleApiClient.Builder(this).addConnectionCallbacks(this).addOnConnectionFailedListener(this).addApi(LocationServices.API).build()mGoogleApiClient!!.connect()}override fun onConnected(bundle: Bundle?) {mLocationRequest = LocationRequest()mLocationRequest.interval = 1000mLocationRequest.fastestInterval = 1000mLocationRequest.priority = LocationRequest.PRIORITY_BALANCED_POWER_ACCURACYif (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {LocationServices.getFusedLocationProviderClient(this)}}override fun onConnectionSuspended(i: Int) {}override fun onLocationChanged(location: Location) {mLastLocation = locationif (mCurrLocationMarker != null) {mCurrLocationMarker!!.remove()}//Place current location markerval latLng = LatLng(location.latitude, location.longitude)val markerOptions = MarkerOptions()markerOptions.position(latLng)markerOptions.title("Current Position")markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN))mCurrLocationMarker = mMap!!.addMarker(markerOptions)//move map cameramMap!!.moveCamera(CameraUpdateFactory.newLatLng(latLng))mMap!!.animateCamera(CameraUpdateFactory.zoomTo(11f))//stop location updatesif (mGoogleApiClient != null) {LocationServices.getFusedLocationProviderClient(this)}}override fun onConnectionFailed(connectionResult: ConnectionResult) {}fun searchLocation(view: View) {val locationSearch:EditText = findViewById< EditText> (R.id.editText)lateinit var location: Stringlocation = locationSearch.text.toString()var addressList: List< Address> ? = nullif (location == null || location == "") {Toast.makeText(applicationContext, "provide location", Toast.LENGTH_SHORT).show()}else{val geoCoder = Geocoder(this)try {addressList = geoCoder.getFromLocationName(location, 1)} catch (e: IOException) {e.printStackTrace()}val address = addressList!![0]val latLng = LatLng(address.latitude, address.longitude)mMap!!.addMarker(MarkerOptions().position(latLng).title(location))mMap!!.animateCamera(CameraUpdateFactory.newLatLng(latLng))Toast.makeText(applicationContext, address.latitude.toString() + " " + address.longitude, Toast.LENGTH_LONG).show()}}}

AndroidManifest.xml

< ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android="http://schemas.android.com/apk/res/android"package="example.srcmini.com.kotlingooglesearchlocation"> < uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> < uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> < uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> < uses-permission android:name="android.permission.INTERNET" /> < applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/AppTheme"> < meta-dataandroid:name="com.google.android.geo.API_KEY"android:value="http://www.srcmini.com/@string/google_maps_key" /> < activityandroid:name=".MapsActivity"android:label="@string/title_activity_maps"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name="android.intent.category.LAUNCHER" /> < /intent-filter> < /activity> < /application> < /manifest>

输出：
注意：请在实际的Android设备上进行检查, 以获取最佳输出结果。