Displaying multiple routes using Directions API in Android

Question

I am using this class to display a route on a map. The problem is that it only displays one route. What I want to do is display multiple alternate routes on the map. Even th

Answer 1

i think you don't have to get the response of Google Server and parse it in Document, other wise you can convert from InputStream to String using:

private String convertStreamToString(final InputStream input) throws Exception {
    try {
        final BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        final StringBuffer sBuf = new StringBuffer();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sBuf.append(line);
        }
        return sBuf.toString();
    } catch (Exception e) {
        throw e;
    } finally {
        try {
            input.close();
        } catch (Exception e) {
            throw e;
        }
    }

then you will have to parse the response as JSONObject

JSONObject jSONObject = new JSONObject(string);

then you get JSONArray named routes

JSONArray routeJSONArray = jSONObject.getJSONArray("routes");

now you can start fetching data from each route by getting its index from JSONArray.

i have written a snippet of code as a model of route

Route.java

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

import android.content.Context;

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

public class Route implements Serializable {

    private static final long serialVersionUID = 1L;
    private Bound bounds;
    private String copyrights;
    private List legs;
    private Polyline overviewPolyLine;
    private String summary;

    public Route(Context context) {
        legs = new ArrayList();
    }

    public Bound getBounds() {
        return bounds;
    }

    public void setBounds(Bound bounds) {
        this.bounds = bounds;
    }

    public String getCopyrights() {
        return copyrights;
    }

    public void setCopyrights(String copyrights) {
        this.copyrights = copyrights;
    }

    public List getLegs() {
        return legs;
    }

    public void setLegs(List legs) {
        this.legs = legs;
    }

    public void addLeg(Leg leg) {
        this.legs.add(leg);
    }

    public Polyline getOverviewPolyLine() {
        return overviewPolyLine;
    }

    public void setOverviewPolyLine(Polyline overviewPolyLine) {
        this.overviewPolyLine = overviewPolyLine;
    }

    public String getSummary() {
        return summary;
    }

    public void setSummary(String summary) {
        this.summary = summary;
    }

    public static long getSerialversionuid() {
        return serialVersionUID;
    }

}

Bound.java

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

public class Bound {
    private LatLng northEast;
    private LatLng southWest;
    public LatLng getNorthEast() {
        return northEast;
    }
    public void setNorthEast(LatLng northEast) {
        this.northEast = northEast;
    }
    public LatLng getSouthWest() {
        return southWest;
    }
    public void setSouthWest(LatLng southWest) {
        this.southWest = southWest;
    }
}

Leg.java

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

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

public class Leg {
    private Distance distance;
    private Duration duration;
    private String endAddress;
    private LatLng endLocation;
    private String startAddress;
    private LatLng startLocation;
    private List steps;

    public Leg() {
        steps = new ArrayList();
    }

    public Distance getDistance() {
        return distance;
    }

    public void setDistance(Distance distance) {
        this.distance = distance;
    }

    public Duration getDuration() {
        return duration;
    }

    public void setDuration(Duration duration) {
        this.duration = duration;
    }

    public String getEndAddress() {
        return endAddress;
    }

    public void setEndAddress(String endAddress) {
        this.endAddress = endAddress;
    }

    public LatLng getEndLocation() {
        return endLocation;
    }

    public void setEndLocation(LatLng endLocation) {
        this.endLocation = endLocation;
    }

    public String getStartAddress() {
        return startAddress;
    }

    public void setStartAddress(String startAddress) {
        this.startAddress = startAddress;
    }

    public LatLng getStartLocation() {
        return startLocation;
    }

    public void setStartLocation(LatLng startLocation) {
        this.startLocation = startLocation;
    }

    public List getSteps() {
        return steps;
    }

    public void setSteps(List steps) {
        this.steps = steps;
    }

    public void addStep(Step step) {
        this.steps.add(step);
    }

}

Distance.java

public class Distance {
    private String text;
    private long value;

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

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public long getValue() {
        return value;
    }

    public void setValue(long value) {
        this.value = value;
    }

}

Duration.java

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

    private String text;
    private long value;

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public long getValue() {
        return value;
    }

    public void setValue(long value) {
        this.value = value;
    }

}

Step.java

import java.util.List;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.drawable.Drawable;

import com.google.android.gms.maps.model.LatLng;
import com.nweave.etaxi.driver.R;

public class Step {
    private Distance distance;
    private Duration duration;
    private LatLng endLocation;
    private LatLng startLocation;
    private String htmlInstructions;
    private String travelMode;
    private List points;

    public List getPoints() {
        return points;
    }

    public void setPoints(List points) {
        this.points = points;
    }

    public Distance getDistance() {
        return distance;
    }

    public void setDistance(Distance distance) {
        this.distance = distance;
    }

    public Duration getDuration() {
        return duration;
    }

    public void setDuration(Duration duration) {
        this.duration = duration;
    }

    public LatLng getEndLocation() {
        return endLocation;
    }

    public void setEndLocation(LatLng endLocation) {
        this.endLocation = endLocation;
    }

    public LatLng getStartLocation() {
        return startLocation;
    }

    public void setStartLocation(LatLng startLocation) {
        this.startLocation = startLocation;
    }

    public String getHtmlInstructions() {
        return htmlInstructions;
    }

    public void setHtmlInstructions(String htmlInstructions) {
        this.htmlInstructions = htmlInstructions;
    }

    public String getTravelMode() {
        return travelMode;
    }

    public void setTravelMode(String travelMode) {
        this.travelMode = travelMode;
    }
}

the parsing function will be

public List parse(String routesJSONString) throws Exception {
    try {
        List routeList = new ArrayList();
        final JSONObject jSONObject = new JSONObject(routesJSONString);
        JSONArray routeJSONArray = jSONObject.getJSONArray(ROUTES);
        Route route;
        JSONObject routesJSONObject;
        for (int m = 0; m < routeJSONArray.length(); m++) {
            route = new Route(context);
            routesJSONObject = routeJSONArray.getJSONObject(m);
            JSONArray legsJSONArray;
            route.setSummary(routesJSONObject.getString(SUMMARY));
            legsJSONArray = routesJSONObject.getJSONArray(LEGS);
            JSONObject legJSONObject;
            Leg leg;
            JSONArray stepsJSONArray;
            for (int b = 0; b < legsJSONArray.length(); b++) {
                leg = new Leg();
                legJSONObject = legsJSONArray.getJSONObject(b);
                leg.setDistance(new Distance(legJSONObject.optJSONObject(DISTANCE).optString(TEXT), legJSONObject.optJSONObject(DISTANCE).optLong(VALUE)));
                leg.setDuration(new Duration(legJSONObject.optJSONObject(DURATION).optString(TEXT), legJSONObject.optJSONObject(DURATION).optLong(VALUE)));
                stepsJSONArray = legJSONObject.getJSONArray(STEPS);
                JSONObject stepJSONObject, stepDurationJSONObject, legPolyLineJSONObject, stepStartLocationJSONObject, stepEndLocationJSONObject;
                Step step;
                String encodedString;
                LatLng stepStartLocationLatLng, stepEndLocationLatLng;
                for (int i = 0; i < stepsJSONArray.length(); i++) {
                    stepJSONObject = stepsJSONArray.getJSONObject(i);
                    step = new Step();
                    JSONObject stepDistanceJSONObject = stepJSONObject.getJSONObject(DISTANCE);
                    step.setDistance(new Distance(stepDistanceJSONObject.getString(TEXT), stepDistanceJSONObject.getLong(VALUE)));
                    stepDurationJSONObject = stepJSONObject.getJSONObject(DURATION);
                    step.setDuration(new Duration(stepDurationJSONObject.getString(TEXT), stepDurationJSONObject.getLong(VALUE)));
                    stepEndLocationJSONObject = stepJSONObject.getJSONObject(END_LOCATION);
                    stepEndLocationLatLng = new LatLng(stepEndLocationJSONObject.getDouble(LATITUDE), stepEndLocationJSONObject.getDouble(LONGITUDE));
                    step.setEndLocation(stepEndLocationLatLng);
                    step.setHtmlInstructions(stepJSONObject.getString(HTML_INSTRUCTION));
                    legPolyLineJSONObject = stepJSONObject.getJSONObject(POLYLINE);
                    encodedString = legPolyLineJSONObject.getString(POINTS);
                    step.setPoints(decodePolyLines(encodedString));
                    stepStartLocationJSONObject = stepJSONObject.getJSONObject(START_LOCATION);
                    stepStartLocationLatLng = new LatLng(stepStartLocationJSONObject.getDouble(LATITUDE), stepStartLocationJSONObject.getDouble(LONGITUDE));
                    step.setStartLocation(stepStartLocationLatLng);
                    leg.addStep(step);
                }
                route.addLeg(leg);
            }
            routeList.add(route);
        }
        return routeList;
    } catch (Exception e) {
        throw e;
    }

Regarding the Step Image there is an HTML instruction and another field called maneuver where according to this field you will choose your image

i hope this helps ;)