如何在java google地图中更改集群对象的图标

Question

我在Android Studio的Google地图的集群库中遇到了一个小问题。 问题是我只有群集对象的默认图标，如these icons。

我想给标记一个自定义的图标，但我无法找到关于它在互联网上的任何事情。我发现它在library page上太不清楚了。

在此先感谢！

Answer 1

我找到了解决方案！这是它：

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

    final Drawable clusterIcon = ContextCompat.getDrawable(MainActivity.context,R.drawable.[your_icon]); 

    mClusterIconGenerator.setBackground(clusterIcon); 

    //modify padding for one or two digit numbers 
    if (cluster.getSize() < 10) { 
     mClusterIconGenerator.setContentPadding(40, 20, 0, 0); 
    } 
    else 
    { 
     mClusterIconGenerator.setContentPadding(30, 20, 0, 0); 
    } 

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

} 

这对我有效。

Answer 2

您可以使用位图，绘制一个自定义的视图群集
在你的活动：

@Override 
    protected void onBeforeClusterRendered(Cluster<Asset> cluster, MarkerOptions markerOptions) { 
     //Draw 
     values = calculateData(values); 
     PieChart pieChart = new PieChart(values, realValues); 
     mClusterImageView.setImageDrawable(pieChart); 
     Bitmap icon = mClusterIconGenerator.makeIcon(cluster.getSize() + ""); 
     markerOptions.icon(BitmapDescriptorFactory.fromBitmap(icon)).anchor(.5f, .5f); 
    } 

例如，您可以画一个饼图集群
下面是一个代码：

public class PieChart extends Drawable { 
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
private float[] value_degree; 
private final float[] value_real; 
private int[] COLORS = {0xFF74E370, 0xFF54B8FF, 0xFFFF5754, 0xFF939393}; 
RectF rectf = new RectF(convertDpToPixel(20),convertDpToPixel(17),convertDpToPixel(80), convertDpToPixel(57)); 
RectF rect = new RectF(convertDpToPixel(20),convertDpToPixel(17),convertDpToPixel(80), convertDpToPixel(67)); 
int temp = 0; 

public PieChart(float[] values, float[] realValues) { 
    value_degree = new float[]{values[0], values[1], values[2], values[3]}; 
    value_real = new float[]{realValues[0], realValues[1], realValues[2], realValues[3]}; 
} 

@Override 
public void draw(Canvas canvas) { 
    paint.setColor(Color.BLACK); 
    paint.setShadowLayer(10.0f, 0.0f, 2.0f, 0xFF000000); 
    paint.setStrokeWidth(100); 
    paint.setColor(0xAA777777); 
    canvas.drawOval(rect, paint); 

    for (int i = 0; i < value_degree.length; i++) { 
     if (i == 0) { 
      paint.setShadowLayer(10.0f, 0.0f, 2.0f, 0xFF000000); 
      paint.setStrokeWidth(1); 
      paint.setColor(COLORS[i]); 
      canvas.drawArc(rectf, 0, value_degree[i], true, paint); 
      paint.setColor(Color.BLACK); 
      paint.setTextSize(convertDpToPixel(13)); 
      if (value_real[i] != 0) { 
       double x = 40 * Math.cos(Math.toRadians(value_degree[i]/2)) + 40; 
       double y = 35 * Math.sin(Math.toRadians(value_degree[i]/2)) + 40; 
       canvas.drawText((int) value_real[i]+"", convertDpToPixel((float) x), convertDpToPixel((float) y), paint); 
      } 
     } else { 
      paint.setShadowLayer(10.0f, 0.0f, 2.0f, 0xFF000000); 
      temp += (int) value_degree[i - 1]; 
      paint.setColor(COLORS[i]); 
      canvas.drawArc(rectf, temp, value_degree[i], true, paint); 
      paint.setColor(Color.BLACK); 
      paint.setTextSize(convertDpToPixel(13)); 
      if (value_real[i] != 0) { 
       double x = 40 * Math.cos(Math.toRadians(temp + (value_degree[i]/2))) +40; 
       double y = 35 * Math.sin(Math.toRadians(temp + (value_degree[i]/2))) + 45; 
       canvas.drawText((int) value_real[i] + "", convertDpToPixel((float) x), convertDpToPixel((float) y), paint); 
      } 
     } 
    } 
} 
} 

这是上面的代码的来源：
Google Maps Android 3D Pie Chart Marker Clustering Java