Crash when other files present in recordedCalls dir

[GoogleCodeExporter]

Line 215 of MainActivity.java makes some assumptions about how many characters 
there are in each filename.  If there are unexpected files in that directory, 
it can crash.

https://code.google.com/p/call-recorder-for-android/source/browse/Android%20Call
%20Recorder/src/com/call/recorder/MainActivity.java#215


What steps will reproduce the problem?
1. create a directory called "keepers" in the recordedCalls directory
2. try to start app
3. boom

Original issue reported on code.google.com by [email protected] on 12 Mar 2015 at 6:05