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03-13 10:52:33.715 29549-29549/com.droidsonroids.workcation E/AndroidRuntime: FATAL EXCEPTION: main
                                                                              Process: com.droidsonroids.workcation, PID: 29549
                                                                              java.lang.IllegalArgumentException: radius must be > 0
                                                                                  at android.graphics.RadialGradient.<init>(RadialGradient.java:57)
                                                                                  at android.graphics.drawable.GradientDrawable.ensureValidRect(GradientDrawable.java:938)
                                                                                  at android.graphics.drawable.GradientDrawable.draw(GradientDrawable.java:509)
                                                                                  at android.view.View.getDrawableRenderNode(View.java:15677)
                                                                                  at android.view.View.drawBackground(View.java:15625)
                                                                                  at android.view.View.draw(View.java:15348)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14254)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.draw(View.java:15376)
                                                                                  at android.widget.FrameLayout.draw(FrameLayout.java:652)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14254)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14246)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14246)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.draw(View.java:15376)
                                                                                  at android.widget.FrameLayout.draw(FrameLayout.java:652)
                                                                                  at android.support.v4.widget.NestedScrollView.draw(NestedScrollView.java:1768)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14254)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.support.design.widget.CoordinatorLayout.drawChild(CoordinatorLayout.java:1223)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14246)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14246)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.draw(View.java:15376)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14254)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.support.design.widget.CoordinatorLayout.drawChild(CoordinatorLayout.java:1223)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14246)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14246)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                                  at android.view.ViewGroup.drawChild(ViewGroup.java:3533)
                                                                                  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3327)
                                                                                  at android.view.View.updateDisplayListIfDirty(View.java:14246)
                                                                                  at android.view.View.getDisplayList(View.java:14284)
                                                                                  at android.view.View.draw(View.java:15069)
                                                                              	at android.view.ViewGroup.drawChild(ViewGroup.java:353

public class CustomMarkerClusteringDemoActivity extends BaseMapActivity implements
        ClusterManager.OnClusterClickListener<Person>,ClusterManager.OnClusterInfoWindowClickListener<Person>,
        ClusterManager.OnClusterItemClickListener<Person>,ClusterManager.OnClusterItemInfoWindowClickListener<Person> {

    private ClusterManager<Person> mClusterManager;
    private Random mRandom = new Random(1984);

    @Override
    public boolean onClusterClick(Cluster<Person> cluster) {
        // Show a toast with some info when the cluster is clicked.
        String firstName = cluster.getItems().iterator().next().name;
        Log.e("firstName","="+firstName);

        return true;
    }

    @Override
    public void onClusterInfoWindowClick(Cluster<Person> cluster) {
        // Does nothing, but you could go to a list of the users.
        Log.e("onClusterInfoWindow","onClusterInfoWindowClick");
    }

    @Override
    public boolean onClusterItemClick(Person item) {
        // Does nothing, but you could go into the user's profile page, for example.
        String firstName = item.name;
        Log.e("onClusterItemClick","="+firstName);

        return true;
    }

    @Override
    public void onClusterItemInfoWindowClick(Person item) {
        // Does nothing, but you could go into the user's profile page, for example.
        Log.e("onClusterItemInfoWindow","onClusterItemInfoWindow");
    }

    @Override
    protected void startDemo() {
        getMap().moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(51.503186, -0.126446), 9.5f));

        mClusterManager = new ClusterManager<Person>(this, getMap());
        mClusterManager.setRenderer(new PersonRenderer());

        getMap().setOnCameraIdleListener(mClusterManager);
        getMap().setOnMarkerClickListener(mClusterManager);
      
        getMap().setOnInfoWindowClickListener(mClusterManager);

        mClusterManager.setOnClusterClickListener(this);
        mClusterManager.setOnClusterInfoWindowClickListener(this);
        mClusterManager.setOnClusterItemClickListener(this);
        mClusterManager.setOnClusterItemInfoWindowClickListener(this);
        mClusterManager.setAnimation(false);
        addItems();
        mClusterManager.cluster();

        getAllMarkers();
    }

    private void addItems() {
        // http://www.flickr.com/photos/sdasmarchives/5036248203/
        mClusterManager.addItem(new Person(position(), "Walter", R.drawable.ic_profile_dumy));

        // http://www.flickr.com/photos/usnationalarchives/4726917149/
        mClusterManager.addItem(new Person(position(), "Gran", R.drawable.ic_profile_dumy));

        // http://www.flickr.com/photos/nypl/3111525394/
        mClusterManager.addItem(new Person(position(), "Ruth", R.drawable.ic_profile_dumy));

        // http://www.flickr.com/photos/smithsonian/2887433330/
        mClusterManager.addItem(new Person(position(), "Stefan", R.drawable.ic_profile_dumy));

        // http://www.flickr.com/photos/library_of_congress/2179915182/
        mClusterManager.addItem(new Person(position(), "Mechanic", R.drawable.ic_profile_dumy));

        // http://www.flickr.com/photos/nationalmediamuseum/7893552556/
        mClusterManager.addItem(new Person(position(), "Yeats", R.drawable.ic_profile_dumy));

        // http://www.flickr.com/photos/sdasmarchives/5036231225/
        mClusterManager.addItem(new Person(position(), "John", R.drawable.ic_profile_dumy));

        // http://www.flickr.com/photos/anmm_thecommons/7694202096/
        mClusterManager.addItem(new Person(position(), "Trevor the Turtle", R.drawable.ic_profile_dumy));

        // http://www.flickr.com/photos/usnationalarchives/4726892651/
        mClusterManager.addItem(new Person(position(), "Teach", R.drawable.ic_profile_dumy));
    }

    private LatLng position() {
        return new LatLng(random(51.6723432, 51.38494009999999), random(0.148271, -0.3514683));
    }

    private double random(double min, double max) {
        return mRandom.nextDouble() * (max - min) + min;
    }

    /**
     * Draws profile photos inside markers (using IconGenerator).
     * When there are multiple people in the cluster, draw multiple photos (using MultiDrawable).
     */
    private class PersonRenderer extends DefaultClusterRenderer<Person> {

        private final IconGenerator mIconGenerator = new IconGenerator(getApplicationContext());
        private final IconGenerator mClusterIconGenerator = new IconGenerator(getApplicationContext());
        private final ImageView mImageView;
        private final ImageView mClusterImageView;
        private final int mDimension;

        public PersonRenderer() {
            super(getApplicationContext(), getMap(), mClusterManager);

            View multiProfile = getLayoutInflater().inflate(R.layout.multi_profile, null);
            mClusterIconGenerator.setContentView(multiProfile);
            mClusterImageView = multiProfile.findViewById(R.id.image);

            mImageView = new ImageView(getApplicationContext());
            mDimension = (int) getResources().getDimension(R.dimen.custom_profile_image);
            mImageView.setLayoutParams(new ViewGroup.LayoutParams(mDimension, mDimension));
            int padding = (int) getResources().getDimension(R.dimen.custom_profile_padding);
            mImageView.setPadding(padding, padding, padding, padding);
            mIconGenerator.setContentView(mImageView);

        }

        @Override
        protected void onBeforeClusterItemRendered(Person person, MarkerOptions markerOptions) {
            // Draw a single person.
            // Set the info window to show their name.
            mImageView.setImageResource(person.profilePhoto);
            Bitmap icon = mIconGenerator.makeIcon();
            markerOptions.icon(BitmapDescriptorFactory.fromBitmap(icon)).title(person.name);
        }

        @Override
        protected void onBeforeClusterRendered(Cluster<Person> cluster, MarkerOptions markerOptions) {
            // Draw multiple people.
            // Note: this method runs on the UI thread. Don't spend too much time in here (like in this example).
            List<Drawable> profilePhotos = new ArrayList<Drawable>(Math.min(4, cluster.getSize()));
            int width = mDimension;
            int height = mDimension;

            for (Person p : cluster.getItems()) {
                // Draw 4 at most.
                if (profilePhotos.size() == 4)
                    break;
                Drawable drawable = getResources().getDrawable(p.profilePhoto);
                drawable.setBounds(0, 0, width, height);
                profilePhotos.add(drawable);
            }
            MultiDrawable multiDrawable = new MultiDrawable(profilePhotos);
            multiDrawable.setBounds(0, 0, width, height);

            mClusterImageView.setImageDrawable(multiDrawable);
            Bitmap icon = mClusterIconGenerator.makeIcon(String.valueOf(cluster.getSize()));
            markerOptions.icon(BitmapDescriptorFactory.fromBitmap(icon));

        }

        @Override
        protected boolean shouldRenderAsCluster(Cluster cluster) {
            // Always render clusters.
            //start clustering if at least 2 items overlap
            return cluster.getSize() > 1;
        }
    }