Replace string concatenation with StringBuilder

[Sternbach-Software]

In java, strings are immutable objects, so adding strings together creates multiple strings in memory which the garbage collector then needs to spend time freeing up. This means more memory consumed and more processing time necessary.

The solution is to replace

String s = "";
s += getString();

with

StringBuilder s = new StringBuilder();
s.append(getString());

Examples:

• https://github.com/Sternbach-Software/GeniForAndroid/blob/master/app/src/main/java/app/familygem/detail/SourceActivity.java#L55