Even if such a tool exists (I still don’t know), you will not want to use it if your application is really very simple. There are many differences between the iPhone and Android in the architecture of the visual components and how they work, and there are different rules that apply here, but do not apply there. Therefore, assuming that this tool exists, its final result will allow you to lose all the special functions of the second platform, which will lead to the creation of a very simple application. To do this, the best way to do the conversion is to program the application on another platform again and use its functions.