This tutorial explain how to Draw Polylines between markers on Google Maps v2 in android application.

1. Setup on Goggle Developer Console

1. Go to Goggle Developer Console https://console.developers.google.com/

After you gain access to the console you can start by creating your New project. I choose project name "googlemap"

2. After created project enable Google Maps Android API

Click on Google Maps Android API for enable api

Click on Enable button After successfuly enabled

3. Go to Credentials left hand side menu and create API Key

Press on create credential blue button & select API Key after that API key created dialog show press close button in this dialog.

4. After successfully created API Key add android application Package name (I choose package name com.androidlearningtutorials.googlemap) & SHA1

Check tutorial how to find SHA1 in Andriod Studio SHA1

Click on API Key 1

In Key restriction by default selected is None choose Android apps & Add package name and fingerprint

After added Add package name and fingerprint press on save button.

After successfully copy key & save on note pad these key use in android application.

2. Creating Android Project

1. Create a new project in Android Studio from File ? New Project and fill the project details.

2. Open build.gradle add Google Play Services 'com.google.android.gms:play-services:8.4.0' after adding click on Sync Now

									

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"

    defaultConfig {
        applicationId "com.androidlearningtutorials.googlemap"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        multiDexEnabled true
    }
    android {
        packagingOptions {
            exclude 'META-INF/DEPENDENCIES'
            exclude 'META-INF/NOTICE'
            exclude 'META-INF/LICENSE'
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:25.2.0'

    compile 'com.google.android.gms:play-services:8.4.0'
}


									
								

3. Add the below permissions to AndroidManifest.xml file.

									

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidlearningtutorials.googlemap">

    <!-- need permission for google map -->
    <permission
        android:name="com.androidlearningtutorials.googlemap.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />
    <uses-library android:name="com.google.android.maps" />

    <uses-permission
        android:name="com.androidlearningtutorials.googlemap.permission.MAPS_RECEIVE" />

    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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>

        <meta-data android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />

        <!-- paste create google API Key -->
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="AIzaSyD3S4jr6i1PSRR0N1e6ywdga75LXlCzbOg"/>

    </application>

</manifest>
									
								

4. Now open activity_main.xml add MapFragment like as below.

									

<?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">

    <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="com.wap.googlegps.MapsActivity" />

</RelativeLayout>
									
								

5. Now open MainActivity.java and add the below code.

								

package com.androidlearningtutorials.googlemap;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    GoogleMap googleMap;
    ArrayList pointsArr = null;
    PolylineOptions polylineOptions;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        googleMap = fm.getMap();
        googleMap.getUiSettings().setZoomControlsEnabled(false);
        googleMap.getUiSettings().setCompassEnabled(true);
        googleMap.setPadding(0, 0, 0, 100);

        //collecting co-ordinate points
        pointsArr = new ArrayList<>();
        pointsArr.add(new LatLng(28.588851, 77.3723373));
        pointsArr.add(new LatLng(28.595417, 77.362102));
        pointsArr.add(new LatLng(28.600768, 77.372402));
        pointsArr.add(new LatLng(28.609885, 77.372917));
        pointsArr.add(new LatLng(28.617872, 77.373432));

        //draw polyline on google map
        drawPolyline();
    }

    private void drawPolyline(){

        for(int aind = 0 ; aind < pointsArr.size(); aind++){

            //adding marker on google map
            googleMap.addMarker(new MarkerOptions()
                    .position(pointsArr.get(aind))
                    .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE)));
        }

        //draw polyline
        polylineOptions = new PolylineOptions();
        polylineOptions.color(Color.RED);
        polylineOptions.width(5);
        polylineOptions.addAll(pointsArr);
        googleMap.addPolyline(polylineOptions);

        //googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latlng, 15));
        googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(pointsArr.get(2), 13));


    }
}

								
								

5. Run your application Output as below.

Dheerendra Singh

Dheerendra Singh is a Mobile Developer(Android) & Web Developer(PHP) of Amisun IT Solutions, Master degree in Computer Science.