Warning shows when i use Hash Map In android(Use new SparseArray)

Question

I am new to developing in android. In my android app I\'m using HashMap, but I\'m getting a warning:

**\"Use new SparseArray(...) ins         


        

Answer 1

It's a hint that there is a better data structure for your code.

That hint is from Lint. You usually get it when you have a HashMap of integers to something else.

Its biggest advantage is to treat the integer key as a primitive. In other words, it won't covert to an Integer (the Java object) to use it as a key.

This is a big deal when using large maps. HashMap will result in the creation of many, many Integer objects in that case.

See a few more pieces of information here.