How to create/write file in the root of the Android device?

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Context.openFileOutput is meant to be used for creating files private to your application. they go in your app’s private data directory. you supply a name, not a path: “name The name of the file to open; can not contain path separators”.

http://developer.android.com/reference/android/content/Context.html#openFileOutput(java.lang.String, int)

as for your question, you can’t write to / unless you’re root:

my-linux-box$ adb shell ls -l -d /
drwxr-xr-x root root 2010-01-16 07:42
$

i don’t know what your API is that expects you to write to the root directory, but i’m guessing it’s not an Android API and you’re reading the wrong documentation 😉

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