Kotlin Android Google Map固定位置 KotlinAndroidGoogleMap固定位置|Ko

Google Map显示当前位置, 导航位置方向, 搜索位置等。要将Google Map放置在应用程序中, 我们需要创建Google Map API密钥并将其集成到我们的应用程序中。
使用Java代码的Google Map教程在Android Google Map上实现。
在本教程中, 我们将把Google Maps集成到我们的Android应用程序中。要将Google Map放置在应用程序中, 请选择活动类型作为Google Maps Activity。默认情况下, 此活动会生成Google地图所需的必需配置和设置。

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要实现Google Map, 我们需要生成Google Map API密钥并将其集成到我们的应用程序中。
复制res / values / google_map_api.xml文件中的网址, 并将其粘贴到浏览器中, 或者我们可以直接在Console Google Developer上访问以生成Google Map API密钥。

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单击创建API密钥以生成API密钥。

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单击创建API密钥后, 它将生成显示以下屏幕的我们的API密钥。

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将生成的API密钥粘贴到我们的res / values / google_map_api.xml文件中。

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activity_maps.xml
在activity_maps.xml布局文件中添加以下代码。

< 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.kotlingooglemap.MapsActivity" />

build.gradle
在build.gradle文件中添加Google Map Service和Google Location Service依赖项。

dependencies {implementation fileTree(include: ['*.jar'], dir: 'libs')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'implementation 'com.google.android.gms:play-services-location:11.8.0'testImplementation 'junit:junit:4.12'}

strings.xml

< resources> < string name="app_name"> Kotlin Google Map< /string> < string name="title_activity_maps"> Map Fixed 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> < !--Follow the directions here:https://developers.google.com/maps/documentation/android/signupOnce 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"> AIzaSyCmTF-n-REPLACE-WITH-YOUR-KEY< /string> < /resources>

MapsActivity.kt
要在MapsActivity.kt类中获取GoogleMap对象, 我们需要实现OnMapReadyCallback接口并覆盖onMapReady()回调方法。要在地图上显示定位位置, 请将纬度和经度点放置在LatLng（纬度, 经度）中。
GoogleMap.addMarker()指向给定位置的位置。

package example.srcmini.com.kotlingooglemapimport android.os.Bundleimport android.support.v7.app.AppCompatActivityimport 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.Markerimport com.google.android.gms.maps.model.MarkerOptionsclass MapsActivity : AppCompatActivity(), OnMapReadyCallback, GoogleMap.OnMarkerClickListener {private lateinit var mMap: GoogleMapoverride 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)}/*** Manipulates the map once available.* This callback is triggered when the map is ready to be used.* This is where we can add markers or lines, add listeners or move the camera. In this case, * we just add a marker near Sydney, Australia.* If Google Play services is not installed on the device, the user will be prompted to install* it inside the SupportMapFragment. This method will only be triggered once the user has* installed Google Play services and returned to the app.*/override fun onMapReady(googleMap: GoogleMap) {mMap = googleMap// Add a marker in India and move the cameraval myLocation = LatLng(20.5937, 78.9629)mMap.addMarker(MarkerOptions().position(myLocation).title("Marker in India"))mMap.moveCamera(CameraUpdateFactory.newLatLng(myLocation))mMap.uiSettings.isZoomControlsEnabled = true}override fun onMarkerClick(p0: Marker?) = false}

AndroidManifest.xml
在AndroidManifest.xml文件中添加。

< ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android="http://schemas.android.com/apk/res/android"package="example.srcmini.com.kotlingooglemap"> < uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> < 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：

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MapsActivity.kt
【Kotlin Android Google Map固定位置】建立在Marshmallow版本上的应用程序有助于运行时用户权限。在此类中, 我们通过提供运行时权限访问设备精细位置ACCESS_FINE_LOCATION来创建上述示例。

package example.srcmini.com.kotlingooglemapimport android.Manifestimport android.content.pm.PackageManagerimport android.os.Buildimport android.os.Bundleimport android.support.v4.app.ActivityCompatimport android.support.v4.app.FragmentActivityimport android.widget.Toastimport 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.Markerimport com.google.android.gms.maps.model.MarkerOptionsclass MapsActivity : FragmentActivity(), OnMapReadyCallback, GoogleMap.OnMarkerClickListener{private lateinit var mMap: GoogleMapcompanion object {private val MY_PERMISSION_FINE_LOCATION = 101}override 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 = googleMap// Add a marker in India and move the cameraval india = LatLng(20.5937, 78.9629)mMap.addMarker(MarkerOptions().position(india).title("Marker in India"))mMap.moveCamera(CameraUpdateFactory.newLatLng(india))if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {mMap.isMyLocationEnabled = true}else {//condition for Marshmello and aboveif (Build.VERSION.SDK_INT > = Build.VERSION_CODES.M) {requestPermissions(arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), MY_PERMISSION_FINE_LOCATION)}}mMap.setOnMarkerClickListener(this)}override fun onMarkerClick(p0: Marker?) = falseoverride fun onRequestPermissionsResult(requestCode: Int, permissions: Array< String> , grantResults: IntArray) {super.onRequestPermissionsResult(requestCode, permissions, grantResults)when (requestCode) {MY_PERMISSION_FINE_LOCATION -> if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {//permission to access location grantif (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {mMap.isMyLocationEnabled = true}}//permission to access location deniedelse {Toast.makeText(applicationContext, "This app requires location permissions to be granted", Toast.LENGTH_LONG).show()finish()}}}}

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