If it's for technical analysis, I think you could try Modulus Finance's stockchartx module for web sites, by receiving its output in a webView. But of course you will need a webServer for this. If you trully need native code, I think you should search for diagrams' examples in this forum, canvas etc, it shouldn't be very hard to edit them and get the candlestick's type.
Some time ago I started to write a wrapper for AChartEngine. (You can see a first result here)
It is quite easy to write a wrapper for such libraries, though it is much work because these charting libraries have a bunch of classes you need a wrapper for. I currently stopped the work on it because I decided to use Erels charts module in my current project.