Google Map Places Api in Android Kotlin.

Many times we search addresses in google map for that functionality we need google Maps places API so let's start with google places API.

First of all, you need to generate your API key from google console API.

After that, we need to add google place API dependencies in the build.Gradle(:app)

//google places api
implementation 'com.google.android.libraries.places:places:2.5.0'

For the map, I used MapActivity from android studio. So, let's start with the design part.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/txt_address"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="map address"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_next"
        android:text="next"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

activity_maps.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MapsActivity">

<fragment
    android:id="@+id/place_autocomplete_fragment"
    android:name="com.google.android.libraries.places.widget.AutocompleteSupportFragment"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MapsActivity" />



</LinearLayout>

In strings.xml you need to add your map API key.

MainActivity.kt

package com.example.mapplaceapi

import android.annotation.SuppressLint
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
import android.app.Activity
import androidx.activity.result.ActivityResult
import androidx.activity.result.contract.ActivityResultContracts
import androidx.annotation.Nullable


class MainActivity : AppCompatActivity() {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)


        btn_next.setOnClickListener {
            openActivityForResult()
        }
    }

    fun openActivityForResult() {
        val intent = Intent(this, MapsActivity::class.java)
        startActivityForResult(intent, 123)
    }

    @SuppressLint("MissingSuperCall")
    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (resultCode == RESULT_OK && requestCode == 123) {
        var lat = data?.getStringExtra("location")
            var lang = data?.getStringExtra("latlang")
            txt_address.text= lat+","+lang
        }

    }
}

In the map activity, I also used activity result for sending data to the previous activity.

MapsActivity.kt

package com.example.mapplaceapi

import android.app.Activity
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast

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 com.example.mapplaceapi.databinding.ActivityMapsBinding
import com.google.android.gms.common.api.Status
import com.google.android.libraries.places.api.Places
import com.google.android.libraries.places.api.model.Place
import com.google.android.libraries.places.api.net.PlacesClient
import com.google.android.libraries.places.widget.AutocompleteSupportFragment
import com.google.android.libraries.places.widget.listener.PlaceSelectionListener
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.activity_maps.*

class MapsActivity : AppCompatActivity(), OnMapReadyCallback {
    private lateinit var mMap: GoogleMap
    private lateinit var binding: ActivityMapsBinding
    var placesClient: PlacesClient? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMapsBinding.inflate(layoutInflater)
        setContentView(binding.root)
        val apiKey = getString(R.string.google_maps_key)
        if (!Places.isInitialized()) {
            Places.initialize(applicationContext, apiKey)
        }
        // Create a new Places client instance.
        placesClient = Places.createClient(this)

        // 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)

        val autocompleteFragment =
            supportFragmentManager.findFragmentById(R.id.place_autocomplete_fragment) as AutocompleteSupportFragment?
        autocompleteFragment!!.setPlaceFields(
            listOf(
                Place.Field.ID,
                Place.Field.ADDRESS,
                Place.Field.LAT_LNG
            )
          )


        autocompleteFragment.setOnPlaceSelectedListener(object : PlaceSelectionListener {
            override fun onPlaceSelected(place: Place) {
                val address = place.address.toString()

                val latlong = "${place.latLng?.latitude!!}::${place.latLng?.longitude!!}"

                val resultIntent = Intent()

                resultIntent.putExtra("location", address)
                resultIntent.putExtra("latlong", latlong)
                setResult(Activity.RESULT_OK, resultIntent)
                finish()
            }

            override fun onError(status: Status) {
                Toast.makeText(applicationContext, status.toString(), Toast.LENGTH_SHORT).show()
            }
        })

    }

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

        // Add a marker in Ahmedabad and move the camera
        val Ahmedabad = LatLng(23.0225, 72.5714)
        mMap.addMarker(MarkerOptions().position(Ahmedabad).title("Marker in Ahmedabad"))
        mMap.moveCamera(CameraUpdateFactory.newLatLng(Ahmedabad))
    }
}

That's it. Happy Coding!!.