android - 从android发布文件时的内存问题

Question

当我尝试从我的 Android 应用程序上传图像或更大的文件时，它崩溃并出现 OutOfMemoryException。我想知道是否有其他方法可以做到这一点。

我在两个不同的地方遇到了应用程序崩溃:

Base64.encodeToString(bytes, Base64.DEFAULT);

这里的 base64 字符串是 nameValuPairs 集合中的值之一。

HttpClient client = new DefaultHttpClient();
HttpPost httppost = new HttpPost(uo.WebServiceURL);
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(nameValuePairs); // On this line
httppost.setEntity(entity);
HttpResponse response = client.execute(httppost);

有什么想法吗？

Answer 1

If you do it like that, the whole POST must be buffered in memory. This is because it needs to send the Content-Length header first.

Instead, I think you want to use the Apache HTTP libraries, including http://developer.android.com/reference/org/apache/http/entity/FileEntity.html . That will let it figure out the length before reading the file. You can use this answer as a starting point. But the second parameter to the FileEntity constructor should be a mime type (like image/png, text/html, etc.).

Posting a large file in Android

检查这也.........

正如 Schnapple 所说，您的问题似乎非常宽泛，难以阅读和理解。

下面是发送 HTTP POST 并从服务器获取响应的一些通用代码，尽管这可能会有帮助。

public String postPage(String url, File data, boolean returnAddr) {

    ret = null;

    httpClient.getParams().setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.RFC_2109);

    httpPost = new HttpPost(url);
    response = null;

    FileEntity tmp = null;       

    tmp = new FileEntity(data,"UTF-8");

    httpPost.setEntity(tmp);

    try {
        response = httpClient.execute(httpPost,localContext);
    } catch (ClientProtocolException e) {
        System.out.println("HTTPHelp : ClientProtocolException : "+e);
    } catch (IOException e) {
        System.out.println("HTTPHelp : IOException : "+e);
    } 
            ret = response.getStatusLine().toString();

            return ret;
}