How to center text on android IconGenerator

Question

I'm developing an app using lots of markers placed on the map, and I'm using a custom ClusterRenderer to show them. Problem is that I can't draw the cluster's size in the center of the custom marker icon, please see attached screenshot. I've tried adding contentPadding to the IconGenerator, but still no luck, because of the changing number of digits shown. Could you please help me center the text on the generated icon?

Code:

 IconGenerator clusterIconGenerator = new IconGenerator(context);
 clusterIcon = context.getResources().getDrawable(R.drawable.map_cluster);
 clusterIconGenerator.setBackground(clusterIcon);

@Override
protected void onBeforeClusterRendered(Cluster<MyType> cluster, MarkerOptions markerOptions) {

    Bitmap clusterIcon = clusterIconGenerator.makeIcon(String.valueOf(cluster.getSize()));
    markerOptions.icon(BitmapDescriptorFactory.fromBitmap(clusterIcon));
}

Answer 1

UPDATE

starting Apr 1, 2016 a prefix has been added to the Resources of the library so the id="text" has been changed to "amu_text".

---

As stated in the library documentation :

setContentView public void setContentView(View contentView)
Sets the child view for the icon.
If the view contains a TextView with the id "amu_text", operations such as setTextAppearance(Context, int) and makeIcon(String) will operate upon that TextView .

@Override
protected void onBeforeClusterRendered(Cluster<Dashboard_Marker> cluster, MarkerOptions markerOptions) {
    IconGenerator TextMarkerGen = new IconGenerator(context);
    Drawable marker;
    int ClusterSize = cluster.getSize();

    marker = context.getResources().getDrawable(R.drawable.cluster_red);
    TextMarkerGen.setBackground(marker);

    LayoutInflater myInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View activityView = myInflater.inflate(R.layout.cluster_view, null, false);

    TextMarkerGen.setContentView(activityView);
    TextMarkerGen.makeIcon(String.valueOf(cluster.getSize()));

    BitmapDescriptor icon = BitmapDescriptorFactory.fromBitmap(TextMarkerGen.makeIcon());
    markerOptions.icon(icon);
}

with the layout cluster_view as :

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerHorizontal="true"
    android:layout_centerInParent="true"
    android:layout_centerVertical="true"
    android:weightSum="1">

    <TextView
        android:layout_width="61dp"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Medium Text"
        android:textColor="#000000"
        android:id="@+id/amu_text"
        android:layout_marginTop="13dp"
        android:gravity="center" />
</LinearLayout>

note :: the layout must contain one text view with an id = "amu_text" in order for the icon generator to accept it , manipulate all the positioning you want in the layout .