android http下載視頻到指定目錄

public void httpget(String uri){
    HttpURLConnection connection = null;
    FileOutputStream fos = null;
    File fie = new File("/sdcard/W_Local_Data/LiveVideo_file/");
    if(!fie.exists()){
        fie.mkdirs();
    }
    File ff = new File(fie.toString(),"abcd.mp4");
    if(!ff.exists()&&ff.isFile()){
        try {
            ff.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    try {
        URL u = new URL(uri);
        connection = (HttpURLConnection)u.openConnection();
        connection.setConnectTimeout(3000);
        connection.setRequestProperty("Charset", "UTF-8");
        if(connection.getResponseCode() == 200){
            InputStream is = connection.getInputStream();

            byte buf[] = new byte[1024];
            int ii  ;
            fos = new FileOutputStream(ff);
            while ((ii = is.read(buf))!=-1){
                fos.write(buf,0,ii);
            }
            fos.flush();
        }

    } catch (Exception e) {
        e.printStackTrace();
    }finally {
        if(connection != null){
            connection.disconnect();
        }
        if(fos != null){
            try {
                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}