Create google map with directions one point to another point with distance and time

Creating New Project

• Create a new project in Android Studio from File ⇒ New Project. When selecting Empty Activity and proceed.
• Add WoWoViewPager dependency to your build.gradle and rebuild the project.

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:27.*'
    implementation 'com.android.support:design:27.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.google.android.gms:play-services:11.2.0'
}

Create four XML layouts named activity_main.xml  under res ⇒ layouts.

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

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etOrigin"
        android:hint="Enter origin address" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter destination address"
        android:id="@+id/etDestination" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Find path"
            android:id="@+id/btnFindPath" />
        <ImageView
            android:layout_marginLeft="20dp"
            android:layout_marginTop="5dp"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@drawable/ic_distance"/>
        <TextView
            android:layout_marginLeft="5dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0 km"
            android:id="@+id/tvDistance" />

        <ImageView
            android:layout_marginLeft="20dp"
            android:layout_marginTop="5dp"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:padding="5dp"
            android:src="@drawable/ic_clock"/>
        <TextView
            android:layout_marginLeft="5dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0 min"
            android:id="@+id/tvDuration" />
    LinearLayout>


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

LinearLayout>

• Create DirectionFinder.java and modify the code as below. 

package waytofeed.wappteh.com.googleroutemap.Modules;

import android.os.AsyncTask;

import com.google.android.gms.maps.model.LatLng;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;


public class DirectionFinder {
    private static final String DIRECTION_URL_API = "https://maps.googleapis.com/maps/api/directions/json?";
    private static final String GOOGLE_API_KEY = "@string/google_app_id";
    private DirectionFinderListener listener;
    private String origin;
    private String destination;

    public DirectionFinder(DirectionFinderListener listener, String origin, String destination) {
        this.listener = listener;
        this.origin = origin;
        this.destination = destination;
    }

    public void execute() throws UnsupportedEncodingException {
        listener.onDirectionFinderStart();
        new DownloadRawData().execute(createUrl());
    }

    private String createUrl() throws UnsupportedEncodingException {
        String urlOrigin = URLEncoder.encode(origin, "utf-8");
        String urlDestination = URLEncoder.encode(destination, "utf-8");

        return DIRECTION_URL_API + "origin=" + urlOrigin + "&destination=" + urlDestination + "&key=" + GOOGLE_API_KEY;
    }

    private class DownloadRawData extends AsyncTask {

        @Override
        protected String doInBackground(String... params) {
            String link = params[0];
            try {
                URL url = new URL(link);
                InputStream is = url.openConnection().getInputStream();
                StringBuffer buffer = new StringBuffer();
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));

                String line;
                while ((line = reader.readLine()) != null) {
                    buffer.append(line + "\n");
                }

                return buffer.toString();

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String res) {
            try {
                parseJSon(res);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }

    private void parseJSon(String data) throws JSONException {
        if (data == null)
            return;

        List routes = new ArrayList();
        JSONObject jsonData = new JSONObject(data);
        JSONArray jsonRoutes = jsonData.getJSONArray("routes");
        for (int i = 0; i < jsonRoutes.length(); i++) {
            JSONObject jsonRoute = jsonRoutes.getJSONObject(i);
            Route route = new Route();

            JSONObject overview_polylineJson = jsonRoute.getJSONObject("overview_polyline");
            JSONArray jsonLegs = jsonRoute.getJSONArray("legs");
            JSONObject jsonLeg = jsonLegs.getJSONObject(0);
            JSONObject jsonDistance = jsonLeg.getJSONObject("distance");
            JSONObject jsonDuration = jsonLeg.getJSONObject("duration");
            JSONObject jsonEndLocation = jsonLeg.getJSONObject("end_location");
            JSONObject jsonStartLocation = jsonLeg.getJSONObject("start_location");

            route.distance = new Distance(jsonDistance.getString("text"), jsonDistance.getInt("value"));
            route.duration = new Duration(jsonDuration.getString("text"), jsonDuration.getInt("value"));
            route.endAddress = jsonLeg.getString("end_address");
            route.startAddress = jsonLeg.getString("start_address");
            route.startLocation = new LatLng(jsonStartLocation.getDouble("lat"), jsonStartLocation.getDouble("lng"));
            route.endLocation = new LatLng(jsonEndLocation.getDouble("lat"), jsonEndLocation.getDouble("lng"));
            route.points = decodePolyLine(overview_polylineJson.getString("points"));

            routes.add(route);
        }

        listener.onDirectionFinderSuccess(routes);
    }

    private List decodePolyLine(final String poly) {
        int len = poly.length();
        int index = 0;
        List decoded = new ArrayList();
        int lat = 0;
        int lng = 0;

        while (index < len) {
            int b;
            int shift = 0;
            int result = 0;
            do {
                b = poly.charAt(index++) - 63;
                result |= (b & 0x1f) << shift;
                shift += 5;
            } while (b >= 0x20);
            int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
            lat += dlat;

            shift = 0;
            result = 0;
            do {
                b = poly.charAt(index++) - 63;
                result |= (b & 0x1f) << shift;
                shift += 5;
            } while (b >= 0x20);
            int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
            lng += dlng;

            decoded.add(new LatLng(
                    lat / 100000d, lng / 100000d
            ));
        }

        return decoded;
    }
}

• Create DirectionFinderListener.java and modify the code as below. 

package waytofeed.wappteh.com.googleroutemap.Modules;

import com.google.android.gms.maps.model.LatLng;

import java.util.ArrayList;
import java.util.List;

public interface DirectionFinderListener {
    void onDirectionFinderStart();
    void onDirectionFinderSuccess(List route);
}

• Create Distance.java and modify the code as below. 

package waytofeed.wappteh.com.googleroutemap.Modules;

public class Distance {
    public String text;
    public int value;

    public Distance(String text, int value) {
        this.text = text;
        this.value = value;
    }
}

• Create Duration.java and modify the code as below. 

package waytofeed.wappteh.com.googleroutemap.Modules;

public class Duration {
    public String text;
    public int value;

    public Duration(String text, int value) {
        this.text = text;
        this.value = value;
    }
}

• Create Route.java and modify the code as below.

package waytofeed.wappteh.com.googleroutemap.Modules;

import com.google.android.gms.maps.model.LatLng;

import java.util.List;

public class Route {
    public Distance distance;
    public Duration duration;
    public String endAddress;
    public LatLng endLocation;
    public String startAddress;
    public LatLng startLocation;

    public List points;
}

• Create MainActivity.java and modify the code as below. 

package waytofeed.wappteh.com.googleroutemap;

import android.Manifest;
import android.annotation.SuppressLint;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.support.v4.app.ActivityCompat;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
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.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import waytofeed.wappteh.com.googleroutemap.Modules.DirectionFinder;
import waytofeed.wappteh.com.googleroutemap.Modules.DirectionFinderListener;
import waytofeed.wappteh.com.googleroutemap.Modules.Route;

public class MainActivity extends FragmentActivity implements OnMapReadyCallback, DirectionFinderListener {

    private GoogleMap mMap;
    private Button btnFindPath;
    private EditText etOrigin;
    private EditText etDestination;
    private List originMarkers = new ArrayList<>();
    private List destinationMarkers = new ArrayList<>();
    private List polylinePaths = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        btnFindPath = (Button) findViewById(R.id.btnFindPath);
        etOrigin = (EditText) findViewById(R.id.etOrigin);
        etDestination = (EditText) findViewById(R.id.etDestination);

        btnFindPath.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendRequest();
            }
        });
    }

    @SuppressLint("NewApi")
    private void sendRequest() {
        String origin = etOrigin.getText().toString();
        String destination = etDestination.getText().toString();
        if (origin.isEmpty()) {
            Toast.makeText(this, "Please enter origin address!", Toast.LENGTH_SHORT).show();
            return;
        }
        if (destination.isEmpty()) {
            Toast.makeText(this, "Please enter destination address!", Toast.LENGTH_SHORT).show();
            return;
        }

        try {
            new DirectionFinder(this, origin, destination).execute();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        LatLng hcmus = new LatLng(10.762963, 106.682394);
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(hcmus, 18));
        originMarkers.add(mMap.addMarker(new MarkerOptions()
                .title("??i h?c Khoa h?c t? nhiên")
                .position(hcmus)));

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        mMap.setMyLocationEnabled(true);
    }


    @Override
    public void onDirectionFinderStart() {

        if (originMarkers != null) {
            for (Marker marker : originMarkers) {
                marker.remove();
            }
        }

        if (destinationMarkers != null) {
            for (Marker marker : destinationMarkers) {
                marker.remove();
            }
        }

        if (polylinePaths != null) {
            for (Polyline polyline:polylinePaths ) {
                polyline.remove();
            }
        }
    }

    @Override
    public void onDirectionFinderSuccess(List routes) {
        polylinePaths = new ArrayList<>();
        originMarkers = new ArrayList<>();
        destinationMarkers = new ArrayList<>();

        for (Route route : routes) {
            mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(route.startLocation, 16));
            ((TextView) findViewById(R.id.tvDuration)).setText(route.duration.text);
            ((TextView) findViewById(R.id.tvDistance)).setText(route.distance.text);

            originMarkers.add(mMap.addMarker(new MarkerOptions()
                    .icon(BitmapDescriptorFactory.fromResource(R.drawable.start_blue))
                    .title(route.startAddress)
                    .position(route.startLocation)));
            destinationMarkers.add(mMap.addMarker(new MarkerOptions()
                    .icon(BitmapDescriptorFactory.fromResource(R.drawable.end_green))
                    .title(route.endAddress)
                    .position(route.endLocation)));

            PolylineOptions polylineOptions = new PolylineOptions().
                    geodesic(true).
                    color(Color.BLUE).
                    width(10);

            for (int i = 0; i < route.points.size(); i++)
                polylineOptions.add(route.points.get(i));

            polylinePaths.add(mMap.addPolyline(polylineOptions));
        }
    }
}

• After Finally open AndroidManifest.XML and make IntroActivity as launcher activity. 

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

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />
    <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">
       <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_app_id"/>

        <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>

Github Link: https://github.com/Sudarshan101/distanceGooglemapAndroid