加载天地图，无法显示的坑，Arcgis for android 100.4以及mapbox

Arcgis for android 100.4
解决办法

RequestConfiguration requestConfiguration = new RequestConfiguration();
requestConfiguration.getHeaders().put("referer", "http://map.tianditu.gov.cn/");
webTiledLayer.setRequestConfiguration(requestConfiguration);

arcGISMap.getOperationalLayers().add(webTiledLayer);

参考https://community.esri.com/thread/220496-1003-webtiledlayer-cant-load-map

mapbox和Arcgis for android 100.4加载不出来天地图的共同原因可能是：
需要在AndroidManifest中添加

android:usesCleartextTraffic="true"