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docs: Update custom clustering demo for marker caching #679

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merged 2 commits into from
Apr 8, 2020
Merged

docs: Update custom clustering demo for marker caching #679

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38d2bda
docs: Update custom clustering demo for marker caching
barbeau Apr 2, 2020
1a177c2
Merge branch 'master' into custom-cluster-demo-update
barbeau Apr 2, 2020
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46 changes: 42 additions & 4 deletions .../src/main/java/com/google/maps/android/utils/demo/CustomMarkerClusteringDemoActivity.java
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Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,11 @@
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.model.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.maps.android.clustering.Cluster;
import com.google.maps.android.clustering.ClusterItem;
Expand Down Expand Up @@ -74,17 +76,53 @@ public PersonRenderer() {

@Override
protected void onBeforeClusterItemRendered(Person person, MarkerOptions markerOptions) {
// Draw a single person.
// Set the info window to show their name.
// Draw a single person - show their profile photo and set the info window to show their name
markerOptions
.icon(getItemIcon(person))
.title(person.name);
}

@Override
protected void onClusterItemUpdated(Person person, Marker marker) {
// Same implementation as onBeforeClusterItemRendered() (to update cached markers)
marker.setIcon(getItemIcon(person));
marker.setTitle(person.name);
}

/**
* Get a descriptor for a single person (i.e., a marker outside a cluster) from their
* profile photo to be used for a marker icon
*
* @param person person to return an BitmapDescriptor for
* @return the person's profile photo as a BitmapDescriptor
*/
private BitmapDescriptor getItemIcon(Person person) {
mImageView.setImageResource(person.profilePhoto);
Bitmap icon = mIconGenerator.makeIcon();
markerOptions.icon(BitmapDescriptorFactory.fromBitmap(icon)).title(person.name);
return BitmapDescriptorFactory.fromBitmap(icon);
}

@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).
markerOptions.icon(getClusterIcon(cluster));
}

@Override
protected void onClusterUpdated(Cluster<Person> cluster, Marker marker) {
// Same implementation as onBeforeClusterRendered() (to update cached markers)
marker.setIcon(getClusterIcon(cluster));
}

/**
* Get a descriptor for multiple people (a cluster) to be used for a marker icon. Note: this
* method runs on the UI thread. Don't spend too much time in here (like in this example).
*
* @param cluster cluster to draw a BitmapDescriptor for
* @return a BitmapDescriptor representing a cluster
*/
private BitmapDescriptor getClusterIcon(Cluster<Person> cluster) {
List<Drawable> profilePhotos = new ArrayList<Drawable>(Math.min(4, cluster.getSize()));
int width = mDimension;
int height = mDimension;
Expand All @@ -101,7 +139,7 @@ protected void onBeforeClusterRendered(Cluster<Person> cluster, MarkerOptions ma

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

@Override
Expand Down