安卓的URLConnection的调用setRequestProperty功能，这是什么方法呢？ [英] Android: setRequestProperty function of URLConnection, what does this method do?

问题描述

虽然我知道计算器早已<一个href=\"http://stackoverflow.com/questions/15334920/setrequestproperty-function-of-httpurlconnection\">setRequestProperty HttpURLConnection的问题的功能，我真不明白这是什么方法做。我不能 步入的它在调试时（F7）。我pressed Ctrl-B键来查看方法的身体，但它只具有以下code：

Although I know that StackOverflow has already setRequestProperty function of HttpURLConnection question, I really don't understand what this method does. I cannot "step into" it (F7) when debugging. I pressed Ctrl-B to view the method's body, but it only has the following code:

public void setRequestProperty(String field, String newValue) {
        checkNotConnected();
        if (field == null) {
            throw new NullPointerException("field == null");
        }
    }

和 checkNotConnected ：

private void checkNotConnected() {
        if (connected) {
            throw new IllegalStateException("Already connected");
        }
    }

我的意思是在哪里code，它会将价值的领域呢？任何的解释是AP preciated。

I mean that where is the code that puts the value to the field? Any explanation is appreciated.

更新（2015年8月8日）：
我发现，查看其执行的方式。由于它是抽象的，必须使用Ctrl-Alt键-B，而不是按Ctrl-B来查看。

UPDATE (2015/08/08): I have found the way to view its implementation. Since it's abstract, must use Ctrl-Alt-B instead of Ctrl-B to view.

推荐答案

我猜你是访问了错误的方式，还是有某种保护code的...

I guess you are accessing the wrong way, or have some kind of protected code...

最初的功能是这样的：

/**
 * Sets the general request property. If a property with the key already
 * exists, overwrite its value with the new value.
 * ...
 */
public void setRequestProperty(String key, String value) {
    if (connected)
        throw new IllegalStateException("Already connected");
    if (key == null)
        throw new NullPointerException ("key is null");

    if (requests == null)
        requests = new MessageHeader();

    requests.set(key, value);
}

其中， requests.set（键，值）做什么你问的！）

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