I am working on a video editor program and am fairly new to android and java. What I would like to happen is when the user presses \"create new project\" button, a dialog pops u
As sgarman proposed you can use the SD card (and I think it's better) but if you want to use your application dir you can get it by calling getFilesDir() from your activity, it will return a File object of /data/data/your.app/files then you can get the path and append the new directory:
String dirPath = getFilesDir().getAbsolutePath() + File.separator + "newfoldername";
File projDir = new File(dirPath);
if (!projDir.exists())
projDir.mkdirs();
...