import { isIOS , isAndroid , knownFolders , path , Utils } from '@nativescript/core' ; export function openFile ( ) { let directory ; if ( isIOS ) { directory = knownFolders . ios . downloads ( ) ; } else if ( isAndroid ) { directory = android . os . Environment . getExternalStorageDirectory ( ) . getAbsolutePath ( ) . toString ( ) ; } const filePath = path . join ( directory , 'Test_File_Open.txt' ) ; Utils . openFile ( filePath ) ; }