修正自定义信息窗体显示问题

android/src/main/java/cn/qiuxiang/react/amap3d/AMapMarkerManager.kt

@@ -19,7 +19,7 @@ internal class AMapMarkerManager : ViewGroupManager<AMapMarker>() {
 
     override fun addView(marker: AMapMarker, view: View, index: Int) {
         when (view) {
-            is AMapInfoWindow -> marker.infoWindow = view as ReactViewGroup
+            is AMapInfoWindow -> marker.infoWindow = view
             is AMapOverlay -> marker.setIconView(view)
         }
     }

android/src/main/java/cn/qiuxiang/react/amap3d/AMapView.kt

@@ -80,13 +80,13 @@ class AMapView(context: ThemedReactContext) : MapView(context) {
         }
 
         map.setInfoWindowAdapter(object : AMap.InfoWindowAdapter {
-            private val paddingTop = context.resources.displayMetrics.density
+            val paddingTop = context.resources.displayMetrics.density
 
-            override fun getInfoWindow(marker: Marker): View {
-                return markers[marker.id]?.infoWindow as View
+            override fun getInfoWindow(marker: Marker): View? {
+                return markers[marker.id]?.infoWindow
             }
 
-            override fun getInfoContents(marker: Marker): View {
+            override fun getInfoContents(marker: Marker): View? {
                 val layout = LinearLayout(context)
                 layout.orientation = LinearLayout.VERTICAL
                 val titleView = TextView(context)