I have used the NDK to program some of my app in native C/C++, and I can tell you it is not pretty. It is almost like two separate programs (Java part and C part) with a very expensive and awkward interface between them. Most of you user interface will certainly have to be in Java. You can't access any of your Java variables from the C code. You can't pass arrays by pointers as parameters. I use it mostly for some high performance signal processing tasks. But the Java code also runs surprisingly fast. So don't go to C unless you are absolutely sure you need to. The article referenced by Isuru says it well.
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