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drawployline with multi color google map


because you can't add polylne with different color in loop, but you can  draw a same color line in one block, that is efficiency method.

// 畫軌跡private fun drawMapPolyLine(localDatas: List<AsmDataModel>) {    mMap.clear()    if (localDatas.isNotEmpty() && localDatas.size >= 2) {        var rectOptions = PolylineOptions()        var _rangeID = judgePolyLineColorRange(localDatas[0]) //取第一筆資料的顏色Range        localDatas.forEachIndexed { index, asmDataModel ->            if (index < localDatas.size - 1) { //因為設定經緯度會用下一筆，所以大小要限制好                val newRangeID = judgePolyLineColorRange(asmDataModel) //每次都判斷新值的顏色range                if (_rangeID != newRangeID) { //如果不一樣                    mMap.addPolyline(rectOptions.color(_rangeID)) //就要開始畫舊range的顏色                    _rangeID = newRangeID //然後把舊range換掉                    rectOptions = PolylineOptions() //Polyline實體重設                } //繼續疊加新的上去                rectOptions.add(LatLng(localDatas[index].latitude.toDouble(), localDatas[index].longitude.toDouble()), LatLng(localDatas[index + 1].latitude.toDouble(), localDatas[index + 1].longitude.toDouble()))                if (index == localDatas.size - 2) { //最後一筆畫最後的區塊                    mMap.addPolyline(rectOptions.color(_rangeID))                }            }        }    }}

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