android - 文件在 sdcard/download 文件夹中不存在

Question

我正在使用以下代码从网站下载文件。但是当我转到sdcard/download文件夹时，该文件不存在。

if(et1.equals(example)){

                try {
                    //this is the file you want to download from the remote server
                    String path ="http://lifecraze.com/sercice_tax_faq.zip";
                    //this is the name of the local file you will create
                    String targetFileName = "sercice_tax_faq.zip";
                        boolean eof = false;
                    URL u = new URL(path);
                    HttpURLConnection c = (HttpURLConnection) u.openConnection();
                    c.setRequestMethod("GET");
                    c.setDoOutput(true);
                    c.connect();
                    FileOutputStream f = new FileOutputStream(new File("sdcard/download/"+targetFileName));
                        InputStream in = c.getInputStream();
                        byte[] buffer = new byte[1024];
                        int len1 = 0;
                        while ( (len1 = in.read(buffer)) > 0 ) {
                        f.write(buffer,0, len1);
                                 }
                    f.close();
                    } catch (MalformedURLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    } catch (ProtocolException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                Intent it=new Intent(Example.this,Sucess.class);
                startActivity(it);
            }
            else{
                Intent it=new Intent(Example.this,Failed.class);
                startActivity(it);
            }
        }
    });

请帮助我如何获取sdcard/download文件夹中的文件。

提前致谢

Answer 1

代替:

new File("sdcard/download/"+targetFileName));

尝试:

new File("/sdcard/download", targetFileName));

注意前导斜杠。你想要一个绝对路径。

但是，这样更好，因为这样我们就不会对 SD 卡的安装位置做出假设。

new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString(), targetFileName);