显示排序文件下载的进度值 [英] Show progress value for volley file download

问题描述

我需要以百分比显示文件下载的进度。

目前我正在使用 Volley 库。我使用 InputStreamVolleyRequest 类来进行下载请求和 BufferedOutputStream 来读/写文件。

如何以最有效的方式显示进度更新？

解决方案

提到你正在使用 InputStreamVolleyRequest ，我希望你写了以下代码或类似的东西：

  @Override 
 public void onResponse（byte [] response）{
 HashMap< String，Object> map = new HashMap< String，Object>（）; 
尝试{
 if（response！= null）{
 
 String content = request.responseHeaders.get（Content-Disposition）
 .toString（）; 
 StringTokenizer st = new StringTokenizer（content，=）; 
 String [] arrTag = st.toArray（）; 
 
 String filename = arrTag [1]; 
 filename = filename.replace（：，。）; 
 Log.d（DEBUG :: FILE NAME，filename）; 
 
 try {
 long lenghtOfFile = response.length; 
 
 InputStream input = new ByteArrayInputStream（response）; 
 
文件路径= Environment.getExternalStorageDirectory（）; 
文件文件=新文件（路径，文件名）; 
 map.put（resume_path，file.toString（））; 
 BufferedOutputStream output = new BufferedOutputStream（new FileOutputStream（file））; 
 byte data [] = new byte [1024]; 
 
 long total = 0; 
 
 while（（count = input.read（data））！= -1）{
 total + = count; 
 output.write（data，0，count）; 
} 
 
 output.flush（）; 
 
 output.close（）; 
 input.close（）; 
} catch（IOException e）{
 e.printStackTrace（）; 
 
} 
} 
} catch（异常e）{
 e.printStackTrace（）; 
} 
} 
  

如果你已经这样做了，简单。
获取 ProgressDialog 对象和初始化如下所示：

  progressDialog = new ProgressDialog（Activity Context here）; 
 progressDialog.setTitle（Any Title here）; 
 progressDialog.setMessage（正在下载...）; 
 progressDialog.setProgressStyle（progressDialog.STYLE_HORIZONTAL）; 
 progressDialog.setCancelable（false）; 
 progressDialog.setMax（100）; 
 progressDialog.setProgress（0）; 
 progressDialog.show（）; 
  

然后只需修改while循环，如下所示：

$ b $而（（count = input.read（data））！= -1）{
total + = count;
output.write（data，0，count）;
progress =（int）total * 100 / file_length;
progressDialog.setProgress（progress）;
}

尝试一下，让我知道。

但是，请允许我通知您，Volley不适合大量下载。相反，我建议您使用 DownloadManager 或Apache的 HttpClient 甚至 AsyncTask 。他们更容易使用，也许更好地为此目的。

I need to show the progress of file download in percentage.

Currently I am using Volley library. I use InputStreamVolleyRequest class to make the download request and BufferedOutputStream to read/write the file.

How can I show the progress update in the most efficient manner?

解决方案

As you have mentioned that you are using InputStreamVolleyRequest, I hope you have written the following code or something similar as well:

@Override
public void onResponse(byte[] response) {
    HashMap<String, Object> map = new HashMap<String, Object>();
    try {
        if (response!=null) {

            String content =request.responseHeaders.get("Content-Disposition")
                    .toString();
            StringTokenizer st = new StringTokenizer(content, "=");
            String[] arrTag = st.toArray();

            String filename = arrTag[1];
            filename = filename.replace(":", ".");
            Log.d("DEBUG::FILE NAME", filename);

            try{
                long lenghtOfFile = response.length;

                InputStream input = new ByteArrayInputStream(response);

                File path = Environment.getExternalStorageDirectory();
                File file = new File(path, filename);
                map.put("resume_path", file.toString());
                BufferedOutputStream output = new BufferedOutputStream(new FileOutputStream(file));
                byte data[] = new byte[1024];

                long total = 0;

                while ((count = input.read(data)) != -1) {
                    total += count;
                    output.write(data, 0, count);
                }

                output.flush();

                output.close();
                input.close();
            }catch(IOException e){
                e.printStackTrace();

            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

If you have already done this, putting a progress bar is easy. get ProgressDialog object and initialise as shown below:

progressDialog = new ProgressDialog(Activity Context here);
progressDialog.setTitle("Any Title here");
progressDialog.setMessage("Downloading in Progress...");
progressDialog.setProgressStyle(progressDialog.STYLE_HORIZONTAL);
progressDialog.setCancelable(false);
progressDialog.setMax(100);
progressDialog.setProgress(0);
progressDialog.show();

Then just modify the while loop as shown below:

while ((count = input.read(data)) != -1) {
    total += count;
    output.write(data, 0, count);
    progress = (int)total*100/file_length;
    progressDialog.setProgress(progress);
}

Try this and let me know.

However let me also inform you that Volley is not suitable for heavy download. Rather I suggest you to use DownloadManager or Apache's HttpClient or even AsyncTask. They are easier to use and probably better for this purpose.

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