question: protected boolean checkExternalStorageAndNotify ( String fileName ) { if ( fileName != null && fileName . startsWith ( "null" ) ) { alertDownloadFailure ( R . string . download_no_sdcard_dlg_title ) ; return false ; } String status = Environment . getExternalStorageState ( ) ; if ( ! status . equals ( Environment . MEDIA_MOUNTED ) ) { int title ; if ( status . equals ( Environment . MEDIA_SHARED ) ) { title = R . string . download_sdcard_busy_dlg_title ; } else { title = R . string . download_no_sdcard_dlg_title ; } alertDownloadFailure ( title ) ; return false ; } return true ; }
target:  Check the external storage and notify user on error.