Question

i have a question, what is the best way to append ints and Strings to build a new String? In the allocation debug tool i see too much allocations if i use the operator +.

But i have tried also with StringBuffer and there are still too much allocations.

Anyone can help me?

Thanks

Answer 1

Use StringBuilder or StringBuffer but with adequate initial capacity to avoid re-allocation. The default capacity is 16, so once you exceed that, the data has to be copied into a new bigger place. Use append not +.

int integer = 5;

StringBuilder s = new StringBuilder(100);
s.append("something");
s.append(integer);
s.append("more text");

Will allocate 100 slots upfront.

Reference: http://developer.android.com/reference/java/lang/StringBuilder.html