[android-developers] Looking for information on the Fragment dump() method (FragmentManager too)

Both of these classes have a dump() method which looks useful for
debugging. I tried to use them in a sample application, but I'm not
getting any output at all. My code looks like this from within my
activity:

public void dumpFragmentMgr() {
FragmentManager fm = getFragmentManager();
File dumpFile = new File(Environment.getExternalStorageDirectory() +
"/fmdump.txt");
if(dumpFile.exists()) {
dumpFile.delete();
}
try {
FileOutputStream fos = new FileOutputStream(dumpFile, true);
fm.dump("DIALOG", fos.getFD(), new PrintWriter(fos),
null);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

I'm positive that I have fragments in my fragment manager. My output
file is always empty, although I can see the datetimestamp getting
updated. I'm always passing null for the 4th argument to dump() since
I have no idea what else to put there. I have enableDebugLogging set
to true. Any help please?

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