Android Performance Tip
Posted on:November 04 2012
When developing high performance code for android there are already a lot of tips on the web to use. One thing I learned today: Don't believe other people's suggestions on performance if you haven't tried it out yourself. One common misconception I came across multiple times for example is that it is a negligible trade-off when you use ArrayList instead of a real, Java array. For me, this wasn't true. Replacing an ArrayList with the Java array at performance critical parts of my code resulted in an overall 20% speed increase! I think one reason for this also might be that I used arrays of primitive types. When they are in the ArrayList, each type again is wrapped in a wrapper type (like 'Integer' for 'int'), probably also causing an additional impact. So yes, arrays are faster than ArrayList. Sometimes.
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