private String url=”http://www.oschina.NET/uploads/osc-Android-v2.6.4-release.apk”; private String sdPath = “/sdcard/” + System.currentTimeMillis() + “yuyin.apk”; 

HttpUtils httpUtils=new HttpUtils(); //參數(shù)一:下載的路徑 參數(shù)二:下載到sdpath的路徑 參數(shù)三: httpUtils.download(url, sdPath, true, new RequestCallBack() {  @Override  public void onSuccess(ResponseInfo<File> arg0) {    mBtn.setText("下載完成");    //路徑    String path = arg0.result.getPath();    File file = new File(path);    Intent intent = new Intent(Intent.ACTION_VIEW);      intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");     startActivity(intent);  }  @Override  public void onFailure(HttpException arg0, String arg1) {    mBtn.setText("下載失敗");  }  @Override  public void onLoading(long total, long current, boolean isUploading) {    // TODO Auto-generated method stub    super.onLoading(total, current, isUploading);    mBtn.setText("正在下載.....");  }  @Override  public void onStart() {    super.onStart();    mBtn.setText("開(kāi)始下載");  }});