Kotlin Android Google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.srcmini02.com.kotlingooglesearchlocation.MapsActivity" >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:layout_width="248dp"
            android:layout_height="wrap_content"
            android:id="@+id/editText"
            android:layout_weight="0.5"
            android:inputType="textPersonName"
            android:hint="Search Location" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:onClick="searchLocation"
            android:text="Search" />

    </LinearLayout>
</fragment>

build.gradle

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.srcmini02.com.kotlingooglesearchlocation

    Alternatively, follow the directions here:
    https://developers.google.com/maps/documentation/android/start#get-key

    Once 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.srcmini02.com.kotlingooglesearchlocation

import android.os.Bundle
import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.OnMapReadyCallback
import com.google.android.gms.maps.SupportMapFragment
import com.google.android.gms.maps.model.LatLng
import com.google.android.gms.maps.model.MarkerOptions
import android.location.Address
import android.location.Geocoder
import android.os.Build
import android.support.v4.app.FragmentActivity
import com.google.android.gms.common.api.GoogleApiClient
import com.google.android.gms.maps.model.BitmapDescriptorFactory
import com.google.android.gms.maps.model.Marker
import com.google.android.gms.location.LocationServices
import android.location.Location
import android.Manifest
import android.content.pm.PackageManager
import android.support.v4.content.ContextCompat
import android.view.View
import android.widget.EditText
import android.widget.Toast
import com.google.android.gms.common.ConnectionResult
import com.google.android.gms.location.LocationListener
import com.google.android.gms.location.LocationRequest
import java.io.IOException


class MapsActivity() : FragmentActivity(), OnMapReadyCallback, LocationListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    private var mMap: GoogleMap? = null
    internal lateinit var mLastLocation: Location
    internal var mCurrLocationMarker: Marker? = null
    internal var mGoogleApiClient: GoogleApiClient? = null
    internal lateinit var mLocationRequest: LocationRequest

    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 SupportMapFragment
        mapFragment.getMapAsync(this)
    }

    override fun onMapReady(googleMap: GoogleMap) {
        mMap = googleMap
        if (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
        }

    }

    @Synchronized
    protected 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 = 1000
        mLocationRequest.fastestInterval = 1000
        mLocationRequest.priority = LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY
        if (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 = location
        if (mCurrLocationMarker != null) {
            mCurrLocationMarker!!.remove()
        }
        //Place current location marker
        val 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 camera
        mMap!!.moveCamera(CameraUpdateFactory.newLatLng(latLng))
        mMap!!.animateCamera(CameraUpdateFactory.zoomTo(11f))

        //stop location updates
        if (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: String
        location = locationSearch.text.toString()
        var addressList: List<Address>? = null

        if (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.srcmini02.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" />
    <application
        android: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-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />

        <activity
            android: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：

Geocoder类的方法

activity_maps.xml

build.gradle

strings.xml

google_map_api.xml

MapsActivity.kt

AndroidManifest.xml

注意：请在实际的Android设备上进行检查, 以获取最佳输出结果。

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Geocoder类的方法

activity_maps.xml

build.gradle

strings.xml

google_map_api.xml

MapsActivity.kt

AndroidManifest.xml

注意：请在实际的Android设备上进行检查, 以获取最佳输出结果。

相关推荐

评论 抢沙发

评论前必须登录！

猜你喜欢

热门标签

回顶部

评论抢沙发