MapmyIndia Android SDK – Add Polylines to Map

Last Updated : 15 Nov, 2022

Many times in the android application which displays maps within their android application we will get to see the maps and also display polylines on the maps. In this article, we will take a look at How to add polylines on the map using Map My India SDK in Android.

Note: This Android article covered in both Java and Kotlin languages.

Step by Step Implementation

Step 1: Create a New Project in Android Studio

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio.

Step 2: Downloading SDK for Map My India

Navigate to the link and download the jar file for Map My India SDK. After downloading it copy the file to add it to our project. Navigate to the Project section in your android studio project. Then navigate to Project Name>app>libs. Right-click on it and simply paste the downloaded jar file into that folder.

Step 3: Adding dependency in build.gradle file

Navigate to app > build.gradle file and add the below dependency to it in the dependencies section.

implementation 'com.google.code.gson:gson:2.3'
implementation files('libs/map_sdk_2.1.jar')

After adding the dependency simply sync your project.

Step 4: Working with the activity_main.xml file

Navigate to app > res > layout > activity_main.xml and add the below code to it. Comments are added in the code to get to know in detail.

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"
    tools:context=".MainActivity"> 
  
    <!--on below line we are creating a map view-->
    <com.mmi.MapmyIndiaMapView
        android:id="@+id/idMapView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" /> 
  
</RelativeLayout>

Step 5: Adding permissions in the AndroidManifest.xml file

Navigate to app>AndroidManifest.xml file and add the below permissions to it.

XML

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Now add the below code in the application tag in the AndroidManifest.xml file to use the legacy library within our application.

XML

<uses-library
  android:name="org.apache.http.legacy"
  android:required="false" />

Step 6: Generating your API key for using Map My India SDK

Navigate to the link. Sign Up with your email and password and you will get to see the below screen. Inside that navigate to the credentials tab to see your API key. Copy that API key that we have to use in our project.

Step 7: Working with the MainActivity file

Navigate to app > java > your app’s package name > MainActivity file and add the below code to it. Comments are added in the code to get to know in detail.

Kotlin

package com.gtappdevelopers.mapmyindiakotlin 
  
import android.os.Bundle 
import androidx.appcompat.app.AppCompatActivity 
import com.mmi.LicenceManager 
import com.mmi.MapmyIndiaMapView 
import com.mmi.layers.Marker 
import com.mmi.layers.PathOverlay 
import com.mmi.util.GeoPoint 
import java.util.* 
  
class MainActivity : AppCompatActivity() { 
    override fun onCreate(savedInstanceState: Bundle?) { 
        super.onCreate(savedInstanceState) 
        setContentView(R.layout.activity_main) 
        // on below line we are setting rest api key and map sdk key. 
        LicenceManager.getInstance().restAPIKey = "Enter API key"
        LicenceManager.getInstance().mapSDKKey = "Enter your API key"
        // on below line we are creating variables for map view and initializing it. 
        val mapmyIndiaMapView = findViewById<MapmyIndiaMapView>(R.id.idMapView) 
        // on below line we are getting our map view. 
        val mapView = mapmyIndiaMapView.mapView 
        // on below line we are creating an array list 
        // to display all markers. 
        val geoPoints = ArrayList<GeoPoint>() 
        // on below line adding marker geo point to our list. 
        geoPoints.add(GeoPoint(28.549356, 77.26780099999999)) 
        geoPoints.add(GeoPoint(28.551844, 77.26749)) 
        geoPoints.add(GeoPoint(28.554454, 77.265473)) 
        geoPoints.add(GeoPoint(28.549637999999998, 77.262909)) 
        // on below line we are running loop to display marker 
        for (i in geoPoints) { 
            // on below line we are creating our marker. 
            val marker = Marker(mapView) 
            // on below line we are setting marker position. 
            marker.position = i 
            // on below line we are adding anchor for our marker. 
            marker.setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_CENTER) 
            // on below line we are adding our marker to map view. 
            mapView.overlays.add(marker) 
        } 
        // on below line we are creating a path 
        // overlay to add a polyline. 
        val pathOverlay = PathOverlay(this) 
        // on below line we are setting color for polyline. 
        pathOverlay.color = resources.getColor(R.color.purple_200) 
        // on below line we are setting width of polyline 
        pathOverlay.width = 10f 
        // on below line we are setting points on  
        // which we have to display poly line. 
        pathOverlay.points = geoPoints 
        // on below line we are setting  
        // bounds for map view. 
        mapView.setBounds(geoPoints) 
        // on below line we are adding path overlay. 
        mapView.overlays.add(pathOverlay) 
        mapView.invalidate() 
    } 
}

Java

package com.gtappdevelopers.mapmyindia; 
  
import android.os.Bundle; 
  
import androidx.appcompat.app.AppCompatActivity; 
  
import com.mmi.LicenceManager; 
import com.mmi.MapView; 
import com.mmi.MapmyIndiaMapView; 
import com.mmi.layers.Marker; 
import com.mmi.layers.PathOverlay; 
import com.mmi.util.GeoPoint; 
  
import java.util.ArrayList; 
  
public class MainActivity extends AppCompatActivity { 
  
    @Override
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
        // on below line we are setting rest api key and map sdk key. 
        LicenceManager.getInstance().setRestAPIKey("Enter your API key"); 
        LicenceManager.getInstance().setMapSDKKey("Enter your API key"); 
        // on below line we are creating variables for map view and initializing it. 
        MapmyIndiaMapView mapmyIndiaMapView = findViewById(R.id.idMapView); 
        // on below line we are getting our map view. 
        MapView mapView = mapmyIndiaMapView.getMapView(); 
        // on below line we are creating an array list  
        // to display all markers. 
        ArrayList<GeoPoint> geoPoints = new ArrayList<>(); 
        // on below line adding marker geo point to our list. 
        geoPoints.add(new GeoPoint(28.549356, 77.26780099999999)); 
        geoPoints.add(new GeoPoint(28.551844, 77.26749)); 
        geoPoints.add(new GeoPoint(28.554454, 77.265473)); 
        geoPoints.add(new GeoPoint(28.549637999999998, 77.262909)); 
        // on below line we are running loop to display marker 
        for (int i = 0; i < geoPoints.size(); i++) { 
            // on below line we are creating our marker. 
            Marker marker = new Marker(mapView); 
            // on below line we are setting marker position. 
            marker.setPosition(geoPoints.get(i)); 
            // on below line we are adding anchor for our marker. 
            marker.setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_CENTER); 
            // on below line we are adding our marker to map view. 
            mapView.getOverlays().add(marker); 
        } 
        // on below line we are creating a path overlay to add a polyline. 
        PathOverlay pathOverlay = new PathOverlay(this); 
        // on below line we are setting color for polyline. 
        pathOverlay.setColor(getResources().getColor(R.color.purple_200)); 
        // on below line we are setting width of polyline 
        pathOverlay.setWidth(10); 
        // on below line we are setting points on  
        // which we have to display poly line. 
        pathOverlay.setPoints(geoPoints); 
        // on below line we are setting 
        // bounds for map view. 
        mapView.setBounds(geoPoints); 
        // on below line we are adding path overlay. 
        mapView.getOverlays().add(pathOverlay); 
        mapView.invalidate(); 
  
    } 
}