String converted to float and reserved two decimal places, shopping cart calculated price

Method 1:

The DecimalFormat returned in string format. This class is fully encapsulated in decimal. Like the% number, thousand bits, decimal precision. Scientific calculation.

Float Perprice=float.parsefloat (Textview_price_shopcar.gettext (). toString ()) * count;//string type converted to Float type

DecimalFormat decimalformat=new DecimalFormat (". 00");//character format for construction methods if the decimal place is less than 2 bits, it will be 0.//Reserved Two decimal places

String P=decimalformat.format (Perprice);//format returns a string

Method 2: Use Math.Round to calculate the number format that is returned here.

1234	floatprice=89.89;int itemNum=3;float totalPrice=price*itemNum;floatnum=(float)(Math.round(totalPrice*100)/100);//如果要求精确4位就*10000然后/10000

String converted to float and reserved two decimal places, shopping cart calculated price