public void copyFile(String fromFile,String toFile){
        FileOutputStream fos = null;
        FileInputStream fis = null;
        try {
            fos = new FileOutputStream(toFile);
            fis = new FileInputStream(fromFile);
            byte[] bs = new byte[1024];
            int len = 0;
            while((len=fis.read(bs))>0){
                fos.write(bs,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if(fis!=null){
                    fis.close();
                }
                if(fos!=null){
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }