如何调试 “com.android.okhttp”

在 android kitkat 中，URLConnection 的实现已经被 OkHttp 所取代，它该如何调试呢？

OkHttp 位于此目录中：external/okhttp/android/main/java/com/squareup/okhttp

当我调用 时，它存在UrlInstance.openConnection().getClass().getName()com.android.okhttp.internal.http.HttpURLConnectionImpl

我该如何调试它？看来我不能将/android/main/java/com/squareup/okhttp/*com.android.okhttp.*

当代码执行到return streamHandler.openConnection(this);

/**
 * Returns a new connection to the resource referred to by this URL.
 *
 * @throws IOException if an error occurs while opening the connection.
 */
public URLConnection openConnection() throws IOException {
    return streamHandler.openConnection(this);
}

往前走，但挖不透com.squareup.okhttp.HttpHandler#openConnection

下图中调试器中突出显示的线程为灰色。

package com.squareup.okhttp;

import java.io.IOException;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;

public class HttpHandler extends URLStreamHandler {
    @Override protected URLConnection openConnection(URL url) throws IOException {
        return newOkHttpClient(null /* proxy */).open(url);
    }

    @Override protected URLConnection openConnection(URL url, Proxy proxy) throws IOException {
        if (url == null || proxy == null) {
            throw new IllegalArgumentException("url == null || proxy == null");
        }
        return newOkHttpClient(proxy).open(url);
    }

    @Override protected int getDefaultPort() {
        return 80;
    }

    protected OkHttpClient newOkHttpClient(Proxy proxy) {
        OkHttpClient client = new OkHttpClient();
        client.setFollowProtocolRedirects(false);
        if (proxy != null) {
            client.setProxy(proxy);
        }

        return client;
    }
}