In the Google map V2, groundoverlay function has been added. The overlay on Google map is nothing but image overlays which are tied to coordinates. And when you drag or zoom into the map, they move. The Android Google map custom overlay is basically an image that is being fixed on map.

The Google Map Image Overlay allows Android Developers to fix a single image at one area on the Google map. However this is not the only functionality it provides, you can also implement a drawable map in your Android app.

In this Android app tutorial, we’re going to demonstrate one demo in which, you’ll be able to integrate Google maps with a drawable function to discover the desired places in the particular area.

Getting Started

First, you’ll need to integrate Google maps in your Android application. For this, you can read our article on how to integrate Google maps to obtain current location.

Next, go to the developer console.

Now to track drawing on the map, Extend SupportMapFragment for tracking touch.

public class MapFragment extends SupportMapFragment {

    private OnTouchListener mListener;

public class TouchableWrapper extends FrameLayout {

    public TouchableWrapper(Context context) {

        super(context);

    }

    @Override

    public boolean dispatchTouchEvent(MotionEvent event) {

        switch (event.getAction()) {

            case MotionEvent.ACTION_DOWN:

                mListener.onTouch();

                break;

            case MotionEvent.ACTION_UP:

                mListener.onTouch();

                break;

        }

        return super.dispatchTouchEvent(event);

    }

}

After tracking the touch, use Drawingpanel to draw touch point on canvas.

public class DrawingPanel extends View implements View.OnTouchListener

  for (Path p : paths) 

{

    canvas.drawPath(p, mPaint);

}

Add Dependency in .gradle file.

//For animation

compile 'com.daimajia.androidanimations:library:1.1.2@aar'

compile 'com.nineoldandroids:library:2.4.0'

// For map calculations

compile 'com.google.maps.android:android-maps-utils:0.3.4'

Next, add tracking in Activity.

once map loaded implement draglistner of drawing panel.

1. initialize drawing panel

private FrameLayout flMapContainer;

private DrawingPanel drawingpanel;

flMapContainer = (FrameLayout) findViewById(R.id.flMapContainer);

drawingpanel = new DrawingPanel(this);

drawingpanel.setVisibility(View.GONE);

drawingpanel.setBackgroundColor(Color.parseColor("#50000000"));

flMapContainer.addView(drawingpanel);

2. Set Draging listner

drawingpanel.setOnDragListener(new DrawingPanel.OnDragListener() {

    @Override

    public void onDragEvent(MotionEvent motionEvent) {

3. Get details from ACTION_DOWN, ACTION_MOVE

//declared variable

private ArrayList<LatLng> latLngs;

private Projection projection;

private GoogleMap mMap;

//Track touch point

float x = motionEvent.getX();

float y = motionEvent.getY();

int x_co = Integer.parseInt(String.valueOf(Math.round(x)));

int y_co = Integer.parseInt(String.valueOf(Math.round(y)));

//get Projection from google map

projection = mMap.getProjection();

Point x_y_points = new Point(x_co, y_co);

LatLng latLng = mMap.getProjection().fromScreenLocation(x_y_points);

if (latLngs == null)  public LatLngBounds toBounds(LatLng center, double radius) {

LatLng southwest = SphericalUtil.computeOffset(center, radius * Math.sqrt(2.0), 225);

LatLng northeast = SphericalUtil.computeOffset(center, radius * Math.sqrt(2.0), 45);

return new LatLngBounds(southwest, northeast);

}

latLngs = new ArrayList<LatLng>();

latLngs.add(latLng);

4. Get details from ACTION_UP

private PolygonOptions polygonOptions;

private LatLngBounds bounds;

double maxDistanceFromCenter;

private LatLng latLng;

private LatLngBounds latLngBounds;

//Join all points and draw polygon

polygonOptions.strokeWidth(10);

polygonOptions.strokeColor(ContextCompat.getColor(MapActivity.this, R.color.colorPrimary));

polygonOptions.addAll(latLngs);

mMap.addPolygon(polygonOptions);

drawingpanel.setVisibility(View.GONE);

//find radius and center from drawing

LatLng latLng1 = getPolygonCenterPoint(latLngs);

LatLng latLngxmin = projection.fromScreenLocation(drawingpanel.getPointXMin());

LatLng latLngxmax = projection.fromScreenLocation(drawingpanel.getPointxMax());

LatLng latLngymin = projection.fromScreenLocation(drawingpanel.getPointYmin());

LatLng latLngymax = projection.fromScreenLocation(drawingpanel.getPointYmax());

if (drawingpanel.getPointXMin().x != 0 && drawingpanel.getPointXMin().y != 0)

    maxDistanceFromCenter = distance(latLng1.latitude, latLng1.longitude, latLngxmin.latitude, latLngxmin.longitude);

double tempdistance = 0;

if (drawingpanel.getPointxMax().x != 0 && drawingpanel.getPointxMax().y != 0)

    tempdistance = distance(latLng1.latitude, latLng1.longitude, latLngxmax.latitude, latLngxmax.longitude);

if (tempdistance > maxDistanceFromCenter)

    maxDistanceFromCenter = tempdistance;

if (drawingpanel.getPointYmin().x != 0 && drawingpanel.getPointYmin().y != 0)

    tempdistance = distance(latLng1.latitude, latLng1.longitude, latLngymin.latitude, latLngymin.longitude);

if (tempdistance > maxDistanceFromCenter)

    maxDistanceFromCenter = tempdistance;

if (drawingpanel.getPointYmax().x != 0 && drawingpanel.getPointYmax().y != 0)

    tempdistance = distance(latLng1.latitude, latLng1.longitude, latLngymax.latitude, latLngymax.longitude);

if (tempdistance > maxDistanceFromCenter)

    maxDistanceFromCenter = tempdistance;

drawingpanel.clear();

5. Get LatLngBounds to check marker is in or not

public LatLngBounds toBounds(LatLng center, double radius) {

    LatLng southwest = SphericalUtil.computeOffset(center, radius * Math.sqrt(2.0), 225);

    LatLng northeast = SphericalUtil.computeOffset(center, radius * Math.sqrt(2.0), 45);

    return new LatLngBounds(southwest, northeast);

}

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Start Code Integration

Constants.java

public class Constants {

public static final String[] name = {"The Chocolate Room", "A One Tea Stall", "Ashapura Tea Stall", "ShivShakti Tea Stall"};

public static final  double[] lat = {23.022505, 23.0246724, 23.0249171, 23.0234268};

public static final  double[] lng = {72.571362, 72.572015, 72.57047, 72.56666};

}

MapFragment.java

public class MapFragment extends SupportMapFragment {

    private OnTouchListener mListener;

    @Override

    public View onCreateView(LayoutInflater layoutInflater, ViewGroup viewGroup, Bundle savedInstance) {

        View layout = super.onCreateView(layoutInflater, viewGroup, savedInstance);

        TouchableWrapper frameLayout = new TouchableWrapper(getActivity());

        frameLayout.setBackgroundColor(getResources().getColor(android.R.color.transparent));

        ((ViewGroup) layout).addView(frameLayout,

                new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

        return layout;

    }

    public void setListener(OnTouchListener listener) {

        mListener = listener;

    }

    public interface OnTouchListener {

        public abstract void onTouch();

    }

    public class TouchableWrapper extends FrameLayout {

        public TouchableWrapper(Context context) {

            super(context);

        }

        @Override

        public boolean dispatchTouchEvent(MotionEvent event) {

            switch (event.getAction()) {

                case MotionEvent.ACTION_DOWN:

                    mListener.onTouch();

                    break;

                case MotionEvent.ACTION_UP:

                    mListener.onTouch();

                    break;

            }

            return super.dispatchTouchEvent(event);

        }

    }

}

DrawingPanel.java

public class DrawingPanel extends View implements View.OnTouchListener {

    private static final String TAG = "DrawView";

    private Canvas mCanvas;

    private Path mPath;

    private Paint mPaint;

    private LinkedList<Path> paths = new LinkedList<Path>();

    private Context mContext;

    private OnDragListener onDragListener;

    private Point pointXMin, pointYmin, pointxMax, pointYmax;

    public interface OnDragListener {

        void onDragEvent(MotionEvent motionEvent);

    }

    public OnDragListener getOnDragListener() {

        return onDragListener;

    }

    public void setOnDragListener(OnDragListener onDragListener) {

        this.onDragListener = onDragListener;

    }

    public DrawingPanel(Context context) {

        super(context);

        mContext = context;

        setFocusable(true);

        setFocusableInTouchMode(true);

        this.setOnTouchListener(this);

        pointXMin = new Point();

        pointYmin = new Point();

        pointxMax = new Point();

        pointYmax = new Point();

        pointXMin.set(0, 0);

        pointYmin.set(0, 0);

        pointxMax.set(0, 0);

        pointYmax.set(0, 0);

        mPaint = new Paint();

        mPaint.setAntiAlias(true);

        mPaint.setDither(true);

        mPaint.setColor(ContextCompat.getColor(context, R.color.colorPrimary));

        mPaint.setStyle(Paint.Style.STROKE);

        mPaint.setStrokeJoin(Paint.Join.ROUND);

        mPaint.setStrokeCap(Paint.Cap.ROUND);

        mPaint.setStrokeWidth(10);

        mCanvas = new Canvas();

        mPath = new Path();

        paths.add(mPath);

    }

    @Override

    protected void onSizeChanged(int w, int h, int oldw, int oldh) {

        super.onSizeChanged(w, h, oldw, oldh);

    }

    @Override

    protected void onDraw(Canvas canvas) {

        for (Path p : paths) {

            canvas.drawPath(p, mPaint);

        }

    }

    private float mX, mY;

    private static final float TOUCH_TOLERANCE = 4;

    private void touch_start(float x, float y) {

        mPath.reset();

        mPath.moveTo(x, y);

        mX = x;

        mY = y;

    }

    private void touch_move(float x, float y) {

        float dx = Math.abs(x - mX);

        float dy = Math.abs(y - mY);

        if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {

            mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);

            mX = x;

            mY = y;

        }

    }

    private void touch_up() {

        mPath.lineTo(mX, mY);

        // commit the path to our offscreen

        mCanvas.drawPath(mPath, mPaint);

        // kill this so we don't double draw

        mPath = new Path();

        paths.add(mPath);

    }

    @Override

    public boolean onTouch(View arg0, MotionEvent event) {

        float x = event.getX();

        float y = event.getY();

        if (pointXMin.x == 0) {

            pointXMin.x = (int) x;

            pointXMin.y = (int) y;

            pointxMax.x = (int) x;

            pointxMax.y = (int) y;

            pointYmin.x = (int) x;

            pointYmin.y = (int) y;

            pointYmin.x = (int) x;

            pointYmin.y = (int) y;

        }

        if (pointXMin.x > x) {

            pointXMin.x = (int) x;

            pointXMin.y = (int) y;

        }

        if (pointYmin.y > y) {

            pointYmin.x = (int) x;

            pointYmin.y = (int) y;

        }

        if (pointxMax.x < x) {

            pointxMax.x = (int) x;

            pointxMax.y = (int) y;

        }

        if (pointYmax.y < y) {

            pointYmax.x = (int) x;

            pointYmax.y = (int) y;

        }

        switch (event.getAction()) {

            case MotionEvent.ACTION_DOWN:

                touch_start(x, y);

                invalidate();

                break;

            case MotionEvent.ACTION_MOVE:

                touch_move(x, y);

                invalidate();

                break;

            case MotionEvent.ACTION_UP:

                touch_up();

                invalidate();

                break;

        }

        onDragListener.onDragEvent(event);

        return true;

    }

    public void clear() {

        paths.clear();

        pointXMin.set(0, 0);

        pointYmin.set(0, 0);

        pointxMax.set(0, 0);

        pointYmax.set(0, 0);

        mPaint = new Paint();

        mPaint.setAntiAlias(true);

        mPaint.setDither(true);

        mPaint.setColor(ContextCompat.getColor(mContext, R.color.colorPrimary));

        mPaint.setStyle(Paint.Style.STROKE);

        mPaint.setStrokeJoin(Paint.Join.ROUND);

        mPaint.setStrokeCap(Paint.Cap.ROUND);

        mPaint.setStrokeWidth(10);

        mCanvas = new Canvas();

        mPath = new Path();

        paths.add(mPath);

    }

    public Point getPointXMin() {

        return pointXMin;

    }

    public void setPointXMin(Point pointXMin) {

        this.pointXMin = pointXMin;

    }

    public Point getPointYmin() {

        return pointYmin;

    }

    public void setPointYmin(Point pointYmin) {

        this.pointYmin = pointYmin;

    }

    public Point getPointxMax() {

        return pointxMax;

    }

    public void setPointxMax(Point pointxMax) {

        this.pointxMax = pointxMax;

    }

    public Point getPointYmax() {

        return pointYmax;

    }

    public void setPointYmax(Point pointYmax) {

        this.pointYmax = pointYmax;

    }

}

MapActivity.java

public class MapActivity extends AppCompatActivity implements OnMapReadyCallback {

    private FrameLayout flMapContainer;

    private GoogleMap mMap;

    private ProgressBar progressBar;

    private LinearLayout llMapActionContainer;

    private DrawingPanel drawingpanel;

    private ArrayList<LatLng> latLngs;

    private PolygonOptions polygonOptions;

    private Projection projection;

    private LatLngBounds bounds;

    double maxDistanceFromCenter;

    private LatLng latLng;

    private LatLngBounds latLngBounds;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_maps);

        initControls();

    }

    private void initControls() {

        // Obtain the SupportMapFragment and get notified when the map is ready to be used.

        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()

                .findFragmentById(map);

        mapFragment.getMapAsync(this);

        progressBar = (ProgressBar) findViewById(R.id.progressBar);

        progressBar.setVisibility(View.GONE);

        progressBar.getIndeterminateDrawable()

                .setColorFilter(ContextCompat.getColor(this, R.color.colorPrimary), PorterDuff.Mode.SRC_IN);

        llMapActionContainer = (LinearLayout) findViewById(R.id.llMapActionContainer);

        flMapContainer = (FrameLayout) findViewById(R.id.flMapContainer);

        drawingpanel = new DrawingPanel(this);

        drawingpanel.setVisibility(View.GONE);

        drawingpanel.setBackgroundColor(Color.parseColor("#50000000"));

        flMapContainer.addView(drawingpanel);

    }

    @Override

    public void onMapReady(GoogleMap googleMap) {

        mMap = googleMap;

        ((MapFragment) getSupportFragmentManager().findFragmentById(map)).setListener(new MapFragment.OnTouchListener() {

            @Override

            public void onTouch() {

                if (llMapActionContainer.getVisibility() == View.GONE) {

                    llMapActionContainer.setVisibility(View.VISIBLE);

                    YoYo.with(Techniques.FadeIn).playOn(llMapActionContainer);

                    setFadeOutAfterSomeTime();

                }

            }

        });

        mMap.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() {

            @Override

            public void onMapLoaded() {

                if (mMap != null) {

                    addMarkers();

                }

            }

        });

        drawingpanel.setOnDragListener(new DrawingPanel.OnDragListener() {

            @Override

            public void onDragEvent(MotionEvent motionEvent) {

                //Track touch point

                float x = motionEvent.getX();

                float y = motionEvent.getY();

                int x_co = Integer.parseInt(String.valueOf(Math.round(x)));

                int y_co = Integer.parseInt(String.valueOf(Math.round(y)));

                //get Projection from google map

                projection = mMap.getProjection();

                Point x_y_points = new Point(x_co, y_co);

                LatLng latLng = mMap.getProjection().fromScreenLocation(x_y_points);

                if (latLngs == null)

                    latLngs = new ArrayList<LatLng>();

                latLngs.add(latLng);

                if (motionEvent.getAction() == MotionEvent.ACTION_UP) {

                    mMap.clear();

                    //Join all points and draw polygon

                    polygonOptions.strokeWidth(10);

                    polygonOptions.strokeColor(ContextCompat.getColor(MapActivity.this, R.color.colorPrimary));

                    polygonOptions.addAll(latLngs);

                    mMap.addPolygon(polygonOptions);

                    drawingpanel.setVisibility(View.GONE);

                    //find radius and center from drawing

                    LatLng latLng1 = getPolygonCenterPoint(latLngs);

                    LatLng latLngxmin = projection.fromScreenLocation(drawingpanel.getPointXMin());

                    LatLng latLngxmax = projection.fromScreenLocation(drawingpanel.getPointxMax());

                    LatLng latLngymin = projection.fromScreenLocation(drawingpanel.getPointYmin());

                    LatLng latLngymax = projection.fromScreenLocation(drawingpanel.getPointYmax());

                    if (drawingpanel.getPointXMin().x != 0 && drawingpanel.getPointXMin().y != 0)

                        maxDistanceFromCenter = distance(latLng1.latitude, latLng1.longitude, latLngxmin.latitude, latLngxmin.longitude);

                    double tempdistance = 0;

                    if (drawingpanel.getPointxMax().x != 0 && drawingpanel.getPointxMax().y != 0)

                        tempdistance = distance(latLng1.latitude, latLng1.longitude, latLngxmax.latitude, latLngxmax.longitude);

                    if (tempdistance > maxDistanceFromCenter)

                        maxDistanceFromCenter = tempdistance;

                    if (drawingpanel.getPointYmin().x != 0 && drawingpanel.getPointYmin().y != 0)

                        tempdistance = distance(latLng1.latitude, latLng1.longitude, latLngymin.latitude, latLngymin.longitude);

                    if (tempdistance > maxDistanceFromCenter)

                        maxDistanceFromCenter = tempdistance;

                    if (drawingpanel.getPointYmax().x != 0 && drawingpanel.getPointYmax().y != 0)

                        tempdistance = distance(latLng1.latitude, latLng1.longitude, latLngymax.latitude, latLngymax.longitude);

                    if (tempdistance > maxDistanceFromCenter)

                        maxDistanceFromCenter = tempdistance;

                    drawingpanel.clear();

                    latLngBounds = toBounds(latLng, maxDistanceFromCenter);

                    addMarkers();

                }

            }

        });

    }

    private void addMarkers() {

        int count = 0;

        mMap.clear();

        LatLngBounds.Builder builder = new LatLngBounds.Builder();

        for (int index = 0; index < Constants.lat.length; index++) {

            LatLng marker = new LatLng(Constants.lat[index], Constants.lng[index]);

            if (latLngBounds != null) {

                if (latLngBounds.contains(marker))

                    mMap.addMarker(new MarkerOptions().position(marker).title(Constants.name[index]));

            } else {

                mMap.addMarker(new MarkerOptions().position(marker).title(Constants.name[index]));

                builder.include(marker);

                count++;

            }

        }

        if (count > 0 && latLngBounds == null) {

            LatLngBounds bounds = builder.build();

            CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds,

                    80);

            mMap.animateCamera(cu);

        }

    }

    private LatLng getPolygonCenterPoint(ArrayList<LatLng> polygonPointsList) {

        LatLngBounds.Builder builder = new LatLngBounds.Builder();

        for (int i = 0; i < polygonPointsList.size(); i++) {

            builder.include(polygonPointsList.get(i));

        }

        bounds = builder.build();

        latLng = bounds.getCenter();

        return latLng;

    }

    private double distance(double lat1, double lon1, double lat2, double lon2) {

        Location selected_location = new Location("locationA");

        selected_location.setLatitude(lat1);

        selected_location.setLongitude(lon1);

        Location near_locations = new Location("locationA");

        near_locations.setLatitude(lat2);

        near_locations.setLongitude(lon2);

        double distance = selected_location.distanceTo(near_locations);

        return distance;

    }

    public LatLngBounds toBounds(LatLng center, double radius) {

        LatLng southwest = SphericalUtil.computeOffset(center, radius * Math.sqrt(2.0), 225);

        LatLng northeast = SphericalUtil.computeOffset(center, radius * Math.sqrt(2.0), 45);

        return new LatLngBounds(southwest, northeast);

    }

    private void setFadeOutAfterSomeTime() {

        new Handler().postDelayed(new Runnable() {

            @Override

            public void run() {

                YoYo.with(Techniques.FadeOut).withListener(new com.nineoldandroids.animation.Animator.AnimatorListener() {

                    @Override

                    public void onAnimationStart(com.nineoldandroids.animation.Animator animation) {

                    }

                    @Override

                    public void onAnimationEnd(com.nineoldandroids.animation.Animator animation) {

                        llMapActionContainer.setVisibility(View.GONE);

                    }

                    @Override

                    public void onAnimationCancel(com.nineoldandroids.animation.Animator animation) {

                    }

                    @Override

                    public void onAnimationRepeat(com.nineoldandroids.animation.Animator animation) {

                    }

                }).playOn(llMapActionContainer);

            }

        }, 10000);

    }

    public void onRedoSearchClick(View view) {

        if (latLngs != null)

            latLngs.clear();

        mMap.clear();

        VisibleRegion visibleRegion = mMap.getProjection().getVisibleRegion();

        LatLngBounds latLngBounds = visibleRegion.latLngBounds;

        latLng = latLngBounds.getCenter();

        maxDistanceFromCenter = distance(latLngBounds.getCenter().latitude, latLngBounds.getCenter().longitude, visibleRegion.farRight.latitude, visibleRegion.farRight.longitude);

        this.latLngBounds = null;

        addMarkers();

    }

    public void onDrawOnMapClick(View view) {

        if (latLngs != null)

            latLngs.clear();

        mMap.clear();

        llMapActionContainer.setVisibility(View.GONE);

        drawingpanel.setVisibility(View.VISIBLE);

        drawingpanel.clear();

        polygonOptions = new PolygonOptions();

    }

}

activity_map.xml

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:fitsSystemWindows="true">

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:gravity="center_horizontal"

        android:orientation="vertical"

        tools:context=".LoginActivity">

        <FrameLayout

            android:layout_width="match_parent"

            android:layout_height="match_parent">

            <FrameLayout

                android:id="@+id/flMapContainer"

                android:layout_width="match_parent"

                android:layout_height="match_parent">

                <fragment

                    android:id="@+id/map"

                    class="com.googlemap.view.MapFragment"

                    android:layout_width="match_parent"

                    android:layout_height="match_parent" />

                <LinearLayout

                    android:id="@+id/llMapActionContainer"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:layout_margin="10dp"

                    android:alpha="0"

                    android:background="@drawable/input_roundedcorner"

                    android:orientation="horizontal"

                    android:visibility="gone">

                    <TextView

                        android:id="@+id/textRedoSearchHere"

                        android:layout_width="match_parent"

                        android:layout_height="wrap_content"

                        android:layout_margin="5dp"

                        android:layout_weight="1"

                        android:clickable="true"

                        android:gravity="center_horizontal"

                        android:onClick="onRedoSearchClick"

                        android:padding="8dp"

                        android:text="Redo Search"

                        android:textSize="14sp" />

                    <LinearLayout

                        android:layout_width="1dp"

                        android:layout_height="match_parent"

                        android:layout_marginBottom="8dp"

                        android:layout_marginTop="8dp"

                        android:background="@color/gray_e8">

                    </LinearLayout>

                    <TextView

                        android:id="@+id/textDrawOnMap"

                        android:layout_width="match_parent"

                        android:layout_height="wrap_content"

                        android:layout_margin="5dp"

                        android:layout_weight="1"

                        android:clickable="true"

                        android:gravity="center_horizontal"

                        android:onClick="onDrawOnMapClick"

                        android:padding="8dp"

                        android:text="Draw on Map"

                        android:textSize="14sp" />

                </LinearLayout>

                <ProgressBar

                    android:id="@+id/progressBar"

                    android:layout_width="wrap_content"

                    android:layout_height="wrap_content"

                    android:layout_gravity="center" />

            </FrameLayout>

        </FrameLayout>

    </LinearLayout>

</android.support.design.widget.CoordinatorLayout>

input_roundedcorner.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item>

        <shape android:shape="rectangle">

            <corners android:radius="8dp" />

            <solid android:color="@android:color/white" />

        </shape>

    </item>

</selector>

And done!

However if you face any issue in this Google Map Overlay tutorial, you can contact our mo developers for help.

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Grab a free copy of Google map custom overlay function demo from Github.