private String getModelFileData(){
		String modelData = null;
        FileInputStream fis = null;
        BufferedReader br = null;
        try{
            fis = new FileInputStream(modelDataFileName);
            if(fis != null){
            	System.out.println("aaaaaaaaa");
            }
            br = new BufferedReader(new InputStreamReader(fis , "UTF-8"));
            modelData =fileReader(br);
        }catch ( FileNotFoundException e) {
            e.printStackTrace( );
        }catch ( UnsupportedEncodingException e ){
            e.printStackTrace( );
        }
        return modelData;
	}