Read/Write files


I succesfully built my juce app to an android phone. But when I use my good-old solution for writing files and listing files e.g.:
juce::File::getCurrentWorkingDirectory().getChildFile(“file.txt”).replaceWithText(“your text”);
this is not creating anything. When I list the actual directory, i dont see anything. If I list the name of the actual directory, the result is " / ". So this is the root, but I cant write anything to that folder.
I suppose this is the internal storage of the application. Anybody knows some ways to writing files or getting acces for w/r?