setAmountIcon method
Implementation
void setAmountIcon(AmountType amountType, String amountIcon){
Map<String, String> params = Map<String, String>();
params['amountType'] = amountType.toString().split(".")[1];
print("dart:doTradeMode "+amountType.toString().split(".")[1]);
params['amountIcon'] = amountIcon;
_methodChannel.invokeMethod('setAmountIcon',params);
}