修改Android版本首次初始化路径贴图贴不上的问题

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

@@ -77,6 +77,9 @@ class AMapPathPolyline(context: Context) : ReactViewGroup(context), AMapOverlay
     }
 
     override fun add(map: AMap) {
+        val resource1 = context.resources.getIdentifier( imageName, "drawable", context.packageName)
+        var drawable1 = BitmapDescriptorFactory.fromResource(resource1)
+        bitmapDescriptor = drawable1
         polyline = map.addPolyline(PolylineOptions()
                 .setCustomTexture(bitmapDescriptor)
                 //.setCustomTextureIndex(listOf(0, 1, 2))