parse String color without java

i have a code like this :
String hex = String.format("0x%02x%02x%02x", r * 0.5, green * 0.6, blue * 0.7));
0.5 and 0.6 and 0.7 are variables and i want to set background color of a view from variable hex :
v.setBackgroundColor(Integer.parseInt(hex, 16));
When i try to convert it to Hexadecimal integer it throws exceptions like
java.lang.NumberFormatException
how can i do this?

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