Automation tool to detect unused or redundant code in Android

We are currently working on releasing an Android application to the Google Play Store before which we are planning to do performance test for our application to detect unused and redundant code.

Like for instance, consider the following code snippet as an example

 double x = sqrt(2); 
 if (x > 5) 
 {
   doStuff();
 }

Is there any testing tool in the market that goes through the source code and helps identify such blocks of code?