Question

我遇到以下问题。

我将httpost发送到index.php文件
我的index.php文件返回标题（＆＃39; image / png＆＃39;），当然还有文件
然后我的代码会将响应下载到设备SD卡上的文件
下载并在设备SD卡上使用正确尺寸（示例中的图像为34Mb）

但是下载后，我无法打开设备上的文件。有人知道问题是什么吗？

＆＃13;

String file = "18228";

HttpClient httpclient=new MyHttpClient(mContext); // MyHttpCient handles https
HttpPost httppost= new HttpPost("https://example.com/json/index.php"); // make sure the url is correct.

HttpResponse response=httpclient.execute(httppost);
nameValuePairs.add(new BasicNameValuePair("requestFile",file));

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
File SDCardRoot = Environment.getExternalStorageDirectory();
File fileDownload = new File(SDCardRoot + "/MyFiles" , "General-information-Example.jpg");

InputStream input = null;
OutputStream output = null;
byte[] buffer = new byte[1024];

try {
  System.out.println("Downloading file...");
  input = response.getEntity().getContent();
  output = new FileOutputStream(fileDownload);
  for (int length; (length = input.read(buffer)) > 0;) {
    output.write(buffer, 0, length);
  }
  System.out.println("File successfully downloaded!");
} finally {
  if (output != null) try { output.close(); } catch (IOException logOrIgnore) {}
  if (input != null) try { input.close(); } catch (IOException logOrIgnore) {}
}

＆＃13;

<?php

header('Content-Type: '.$loadFile['header'].'');	
header('Content-Length: ' . filesize($loadFile['file']));
header('Pragma: public');
header('Accept-Ranges: bytes');
header('Cache-Control: no-cache');
header('Content-Disposition: filename="' . basename($loadFile['file']));
header('X-Pad: avoid browser bug');
readfile($loadFile['file']);
exit;

?>

＆＃13;

04-12 12:52:35.080    4822-4999/info.androidhive.customlistviewvolley I/System.out﹕ Downloading file...
04-12 12:52:47.410    4822-4999/info.androidhive.customlistviewvolley I/System.out﹕ File successfully downloaded!
04-12 12:53:08.370    4822-4822/info.androidhive.customlistviewvolley D/OpenGLRenderer﹕ Flushing caches (mode 0)
04-12 12:53:08.400    4822-4822/info.androidhive.customlistviewvolley D/OpenGLRenderer﹕ Flushing caches (mode 1)

＆＃13;

Answer 1

在关闭输出之前放置output.flush();

你的finally语句应该是这样的：if (output != null) try {output.flush(); output.close(); } catch (IOException logOrIgnore) {}

Answer 2

CMYK应为RGB的图像
视频并不总是有效，具体取决于编解码器

来自index.php的Android httpresponse下载png

2 个答案: