Many times in the android application which displays maps within their android application we will get to see the maps and also display polygons 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 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.mapmyindiakotlinimport android.graphics.Colorimport android.os.Bundleimport androidx.appcompat.app.AppCompatActivityimport com.mmi.LicenceManagerimport com.mmi.MapmyIndiaMapViewimport com.mmi.layers.Polygonimport com.mmi.util.GeoPointimport 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 your API key" LicenceManager.getInstance().mapSDKKey = "Enter your maps sdk 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 creating polygon. val polygon: Polygon = Polygon(this) // on below line setting points for poly gon. polygon.points = geoPoints // on below line adding a fill color for poly gon polygon.fillColor = Color.GREEN // on below line setting map view bounds. mapView.setBounds(geoPoints) // on below line adding polygon. mapView.getOverlays().add(polygon) // on below line calling map view. 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.Polygon;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 maps sdk 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 creating polygon. Polygon polygon = new Polygon(MainActivity.this); // on below line setting points for poly gon. polygon.setPoints(geoPoints); // on below line adding a fill color for poly gon polygon.setFillColor(getResources().getColor(R.color.purple_200)); // on below line setting map view bounds. mapView.setBounds(geoPoints); // on below line adding polygon. mapView.getOverlays().add(polygon); // on below line calling map view. mapView.invalidate(); }} |
Now run your application to see the output of it.
Output:
