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法律研究如何在Android Kotlin中根據經緯度獲取完整地址？
本例演示如何在Android Kotlin中根據經緯度獲取完整地址。
步驟1 − 在Android Studio中建立一個新專案，轉到檔案 ⇒ 新建專案，並填寫所有必需的詳細資訊以建立一個新專案。
步驟2 − 將以下程式碼新增到res/layout/activity_main.xml。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16sp" tools:context=".MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_marginTop="50dp" android:text="Tutorials Point" android:textAlignment="center" android:textColor="@android:color/holo_green_dark" android:textSize="32sp" android:textStyle="bold" /> <Button android:id="@+id/btnShowAddress" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="Show Address" /> <TextView android:id="@+id/tvAddress" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/btnShowAddress" android:layout_centerInParent="true" android:textColor="@android:color/background_dark" android:textSize="12sp" android:textStyle="bold" /> </RelativeLayout>
步驟3 − 將以下程式碼新增到src/MainActivity.kt。
import android.content.Intent
import android.content.pm.PackageManager
import android.location.Location
import android.location.LocationManager
import android.os.Bundle
import android.os.Handler
import android.os.Message
import android.provider.Settings
import android.widget.Button
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
class MainActivity : AppCompatActivity() {
lateinit var btnShowAddress: Button
lateinit var tvAddress: TextView
lateinit var location: Location
lateinit var appLocationService: AppLocationService
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "KotlinApp"
tvAddress = findViewById(R.id.tvAddress)
appLocationService = AppLocationService(this)
btnShowAddress = findViewById(R.id.btnShowAddress)
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), 1);
} else {
ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), 1);
}
}
btnShowAddress.setOnClickListener {
location = appLocationService.getLocation(LocationManager.GPS_PROVIDER)!!
val latitude = 13.1000727
val longitude = 80.2126274
val locationAddress = LocationAddress()
locationAddress.getAddressFromLocation(
latitude, longitude, applicationContext, GeoCodeHandler()
)
showSettingsAlert()
}
}
private fun showSettingsAlert() {
val alertDialog = AlertDialog.Builder(this)
alertDialog.setTitle("SETTINGS")
alertDialog.setMessage("Enable Location Provider! Go to settings menu?")
alertDialog.setPositiveButton("Settings") { _, _ ->
val intent = Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)
this@MainActivity.startActivity(intent)
}
alertDialog.setNegativeButton("Cancel") { dialog, _ -> dialog.cancel() }
alertDialog.show()
}
internal inner class GeoCodeHandler : Handler() {
override fun handleMessage(message: Message) {
val locationAddress: String
locationAddress = when (message.what) {
1 -> {
val bundle = message.data
bundle.getString("address")
}
else -> null.toString()
}
tvAddress.text = locationAddress
}
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray
) {
when (requestCode) {
1 -> {
if (grantResults.isNotEmpty() && grantResults[0] ===
PackageManager.PERMISSION_GRANTED) {
if ((ContextCompat.checkSelfPermission(
this@MainActivity,
Manifest.permission.ACCESS_FINE_LOCATION
) === PackageManager.PERMISSION_GRANTED)
) {
Toast.makeText(this, "Permission Granted", Toast.LENGTH_SHORT).show()
}
} else {
Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show()
}
return
}
}
}
}步驟4 − 建立一個Kotlin類，並將以下程式碼新增到AppLocationService.kt。
示例
import android.annotation.SuppressLint
import android.app.Service
import android.content.Context
import android.content.Intent
import android.location.Location
import android.location.LocationListener
import android.location.LocationManager
import android.os.Bundle
import android.os.IBinder
open class AppLocationService(context: Context) : Service(),
LocationListener {
private var locationManager: LocationManager? =
context.getSystemService(Context.LOCATION_SERVICE) as LocationManager
private lateinit var location: Location
@SuppressLint("MissingPermission")
fun getLocation(provider: String?): Location? {
if (locationManager!!.isProviderEnabled(provider)) {
locationManager!!.requestLocationUpdates(
provider,
MIN_TIME_FOR_UPDATE,
MIN_DISTANCE_FOR_UPDATE.toFloat(), this
)
if (locationManager != null) {
location = locationManager!!.getLastKnownLocation(provider)
return location
}
}
return null
}
override fun onLocationChanged(location: Location) {}
override fun onProviderDisabled(provider: String) {}
override fun onProviderEnabled(provider: String) {}
override fun onStatusChanged(
provider: String,
status: Int,
extras: Bundle
) {
}
override fun onBind(arg0: Intent): IBinder? {
return null
}
companion object {
private const val MIN_DISTANCE_FOR_UPDATE: Long = 10
private const val MIN_TIME_FOR_UPDATE = 1000 * 60 * 2.toLong()
}
}步驟5 − 建立一個Kotlin類，並將以下程式碼新增到LocationAddress.kt。
示例
import android.content.Context
import android.location.Geocoder
import android.os.Bundle
import android.os.Handler
import android.os.Message
import android.util.Log
import java.io.IOException
import java.util.*
class LocationAddress {
private val tag = "LocationAddress"
fun getAddressFromLocation(
latitude: Double,
longitude: Double, context: Context, handler: Handler
) {
val thread = object : Thread() {
override fun run() {
val geoCoder = Geocoder(
context,
Locale.getDefault()
)
var result: String = null.toString()
try {
val addressList = geoCoder.getFromLocation(
latitude, longitude, 1
)
if ((addressList != null && addressList.size > 0)) {
val address = addressList.get(0)
val sb = StringBuilder()
for (i in 0 until address.maxAddressLineIndex) {
sb.append(address.getAddressLine(i)).append("
")
}
sb.append(address.locality).append("
")
sb.append(address.postalCode).append("
")
sb.append(address.countryName)
result = sb.toString()
}
} catch (e: IOException) {
Log.e(tag, "Unable connect to GeoCoder", e)
} finally {
val message = Message.obtain()
message.target = handler
message.what = 1
val bundle = Bundle()
result = ("Latitude: " + latitude + " Longitude: " + longitude +
"
Address:
" + result)
bundle.putString("address", result)
message.data = bundle
message.sendToTarget()
}
}
}
thread.start()
}
}步驟6 − 將以下程式碼新增到androidManifest.xml。
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.q11"> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <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"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
讓我們嘗試執行您的應用程式。我假設您已將您的實際Android移動裝置連線到您的計算機。要在Android Studio中執行應用程式，請開啟專案中的一個活動檔案，然後單擊工具欄中的執行圖示
。選擇您的移動裝置作為選項，然後檢查您的移動裝置，它將顯示您的預設螢幕。
更新於：2020年5月26日
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