Android SDK - 文件下載速度非常慢

Question

我構建/複製了一個下載功能，通過URL獲取圖像和視頻並將它們下載到Android設備。

下載小圖片時，這沒有問題。但是，當試圖獲取超過2MB（通過WLAN！）的文件需要從字面上的年齡！ 25MB視頻大約需要5分鐘，依此類推。

任何想法可能會出錯？

這裏是我的代碼：

 /* Open a connection to that URL. */ 
     URLConnection ucon = url.openConnection(); 

     /* 
     * Define InputStreams to read from the URLConnection. 
     */ 
     InputStream is = ucon.getInputStream(); 
     BufferedInputStream bis = new BufferedInputStream(is); 

     /* 
     * Read bytes to the Buffer until there is nothing more to read(-1). 
     */ 
     ByteArrayBuffer baf = new ByteArrayBuffer(50); 
     int current = 0; 
     while ((current = bis.read()) != -1) { 
       baf.append((byte) current); 
     } 

     /* Convert the Bytes read to a String. */ 
     FileOutputStream fos = new FileOutputStream(file); 
     fos.write(baf.toByteArray()); 
     fos.close(); 

Answer 1

使用下載管理器下載文件

 private long enqueue; 
private DownloadManager dm; 

BroadcastReceiver receiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      String action = intent.getAction(); 


      if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) { 
       long downloadId = intent.getLongExtra(
         DownloadManager.EXTRA_DOWNLOAD_ID, 0); 
       Query query = new Query(); 
       query.setFilterById(enqueue); 
       Cursor c = dm.query(query); 
       if (c.moveToFirst()) { 
        int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS); 
        if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) { 

         Log.e("Download completed","HERE DOWNLOAD COMPLETED"); 
         try 
         { 
                 } 
         catch (Exception e) { 
          // TODO: handle exception 
         } 

        } 
} 
      } 
}}; 

要開始下載使用：

  dm = (DownloadManager)activityContext.getSystemService(activityContext.DOWNLOAD_SERVICE); 
    Request request = new Request(Uri.parse("URL")).setDestinationInExternalPublicDir("DIRECTORY","FILENAME"); 
    enqueue = dm.enqueue(request);