修改路径贴图初始化为空的问题

lib/android/src/main/java/cn/qiuxiang/react/amap3d/maps/AMapPathPolyline.kt

@@ -83,6 +83,9 @@ class AMapPathPolyline(context: Context) : ReactViewGroup(context), AMapOverlay
     }
 
     override fun add(map: AMap) {
+       //初始化贴图为空处理
+        val drawable = context.resources.getIdentifier(imageName, "drawable", context.packageName)
+        bitmapDescriptor = BitmapDescriptorFactory.fromResource(drawable)
         polyline = map.addPolyline(PolylineOptions()
                 .setCustomTexture(bitmapDescriptor)
                 //.setCustomTextureIndex(listOf(0, 1, 2))