Android应用中实现文件下载的方法有哪些-创新互联

本篇文章为大家展示了Android应用中实现文件下载的方法有哪些，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

一、自己封装URLConnection 连接请求类

 public void downloadFile1() {
  try{
    //下载路径，如果路径无效了，可换成你的下载路径
    String url = "http://c.qijingonline.com/test.mkv";
    String path = Environment.getExternalStorageDirectory().getAbsolutePath();

    final long startTime = System.currentTimeMillis();
    Log.i("DOWNLOAD","startTime="+startTime);
    //下载函数
    String filename=url.substring(url.lastIndexOf("/") + 1);
    //获取文件名
    URL myURL = new URL(url);
    URLConnection conn = myURL.openConnection();
    conn.connect();
    InputStream is = conn.getInputStream();
    int fileSize = conn.getContentLength();//根据响应获取文件大小
    if (fileSize <= 0) throw new RuntimeException("无法获知文件大小 ");
    if (is == null) throw new RuntimeException("stream is null");
    File file1 = new File(path);
    if(!file1.exists()){
      file1.mkdirs();
    }
    //把数据存入路径+文件名
    FileOutputStream fos = new FileOutputStream(path+"/"+filename);
    byte buf[] = new byte[1024];
    int downLoadFileSize = 0;
    do{
      //循环读取
      int numread = is.read(buf);
      if (numread == -1)
      {
        break;
      }
      fos.write(buf, 0, numread);
      downLoadFileSize += numread;
      //更新进度条
    } while (true);
    Log.i("DOWNLOAD","download success");
    Log.i("DOWNLOAD","totalTime="+ (System.currentTimeMillis() - startTime));
    is.close();
  } catch (Exception ex) {
    Log.e("DOWNLOAD", "error: " + ex.getMessage(), ex);
  }
}