高德地图热点图

用法

TileProvider tileProvider = new HeatmapTileProvider
.Builder()
.radius(15) //半径
.weightedData(WeightedLatLngCollection) 
.build();
//WeightedLatLngCollection是Collection<WeightedLatLng>集合

tileOverlay = aMap.addTileOverlay(new TileOverlayOptions()
				.tileProvider(tileProvider)
				.diskCacheDir(cache + "/amap").diskCacheEnabled(false)
				.diskCacheSize(10000));