Get the file size in android sdk?

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The File.length() method returns the following according to the javadoc:

“The length, in bytes, of the file denoted by this abstract pathname, or 0L if the file does not exist. Some operating systems may return 0L for pathnames denoting system-dependent entities such as devices or pipes.”

As you can see, zero can be returned:

  • if the file exists but contained zero bytes.
  • if the file does not exist, or
  • if the file is some OS-specific special file.

My money is on the second case; i.e. that you have the wrong filename / pathname. Try calling File.exists() on the filename to see what that tells you. The other two cases are possible too, I guess.

(For the record, most /proc/... files on a Linux-based system also have an apparent file size of zero. And Android is Linux based.)

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