Teach with us

How can I find the latitude and longitude from address on Android using Kotlin?

Kotlin Apps/ApplicationsMobile DevelopmentAndroid

This example demonstrates how to find the latitude and longitude from address on Android using Kotlin.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to 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="8dp"
   tools:context=".MainActivity">
   <TextView
      android:id="@+id/textViewAddress"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentStart="true"
      android:text="Enter Address: "
      android:textAppearance="?android:attr/textAppearanceMedium"
      android:textStyle="bold" />
   <EditText
      android:id="@+id/editTextAddress"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_alignParentTop="true"
      android:layout_toEndOf="@+id/textViewAddress"
      android:singleLine="true"
      android:text="" />
   <Button
      android:id="@+id/addressButton"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@+id/textViewAddress"
      android:layout_marginTop="50dp"
      android:layout_toEndOf="@+id/textViewAddress"
      android:text="Show Lat/Long" />
   <TextView
      android:id="@+id/latLongTV"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerVertical="true"
      android:layout_toEndOf="@+id/textViewAddress"
      android:text=""
      android:textAppearance="?android:attr/textAppearanceLarge"
      android:textColor="@android:color/background_dark" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.kt

import android.os.Bundle
import android.os.Handler
import android.os.Message
import android.widget.Button
import android.widget.EditText
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
   private lateinit var addressButton: Button
   private lateinit var textViewAddress: TextView
   lateinit var textViewLatLong: TextView
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      textViewAddress = findViewById(R.id.textViewAddress)
      textViewLatLong = findViewById(R.id.latLongTV)
      addressButton = findViewById(R.id.addressButton)
      addressButton.setOnClickListener {
         val editText = findViewById<EditText>(R.id.editTextAddress)
         val address = editText.text.toString()
         val locationAddress = GeoCodingLocation()
         locationAddress.getAddressFromLocation(address, applicationContext,
         GeoCoderHandler(this))
      }
   }
   companion object {
      private class GeoCoderHandler(private val mainActivity: MainActivity) : Handler() {
         override fun handleMessage(message: Message) {
            val locationAddress: String?
            locationAddress = when (message.what) {
               1 -> {
                  val bundle = message.data
                  bundle.getString("address")
               }
               else -> null
            }
            mainActivity.textViewLatLong.text = locationAddress
         }  
      }
   }
}

Step 4 − Create a new Kotlin class and add the following code in GeoCodingLocation.kt

import android.content.Context
import android.location.Address
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 GeoCodingLocation {
   private val TAG = "GeoCodeLocation"
   fun getAddressFromLocation(
      locationAddress: String,
      context: Context, handler: Handler
   ) {
      val thread = object : Thread() {
         override fun run() {
            val geoCoder = Geocoder(
               context,
               Locale.getDefault()
            )
            var result: String? = null
            try {
               val addressList = geoCoder.getFromLocationName(locationAddress, 1)
               if (addressList != null && addressList.size > 0) {
                  val address = addressList.get(0) as Address
                  val sb = StringBuilder()
                  sb.append(address.latitude).append("\n")
                  sb.append(address.longitude).append("\n")
                  result = sb.toString()
               }
            } catch (e: IOException) {
               Log.e(TAG, "Unable to connect to GeoCoder", e)
            } finally {
               val message = Message.obtain()
               message.target = handler
               message.what = 1
               val bundle = Bundle()
               result = ("Address: $locationAddress" +
               "\n\nLatitude and Longitude: \n" + result)
               bundle.putString("address", result)
               message.data = bundle
               message.sendToTarget()
            }
         }
      }
      thread.start()
   }
}

Step 5 − Add the following code to 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>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen

raja
Azhar
Updated on 26-May-2020 08:36:28

Previous Page Print Page Next Page  
Advertisements