有没有办法让HttpUriRequest的内容长度让它在Android的/ Java的被发送？ [英] Is there a way to get the Content-Length of HttpUriRequest before it gets sent in Android / Java?

问题描述

我想有我的Andr​​oid应用程序跟踪其自己的数据使用量。我能得到的HTTP响应的内容长度，但我找不到它发送出去之前，如何获得请求的大小。所有的请求（GET，POST，PUT等）是 HttpUriRequest 实例。

I want to have my Android app track its own data usage. I can get the Content-Length of the HTTP response, but I can't find how to get the size of the request before it's sent out. All the requests (GET, POST, PUT, etc) are instances of HttpUriRequest.

感谢

推荐答案

与内容的所有请求应的子类 HttpEntityEnclosingRequestBase 。

All requests with content should be a subclass of HttpEntityEnclosingRequestBase.

HttpUriRequest req = ...;
long length = -1L;
if (req instanceof HttpEntityEnclosingRequestBase) {
    HttpEntityEnclosingRequestBase entityReq = (HttpEntityEnclosingRequestBase) req;
    HttpEntity entity = entityReq.getEntity();
    if (entity != null) {
        // If the length is known (i.e. this is not a streaming/chunked entity)
        // this method will return a non-negative value.
        length = entity.getContentLength();
    }
}

if (length > -1L) {
    // This is the Content-Length. Some cases (streaming/chunked) doesn't
    // know the length until the request has been sent however.
}

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