Android 网络编程（4）: 从源码解析Volley（上）

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));

}

}

BasicNetwork network1 = new BasicNetwork (( HttpStack ) stack );

RequestQueue queue1 ;

if ( maxDiskCacheBytes 1 ) {

queue1 = new RequestQueue ( new DiskBasedCache ( cacheDir ), network1 );

} else {

queue1 = new RequestQueue ( new DiskBasedCache ( cacheDir , maxDiskCacheBytes ), network1 );

}

queue1 . start ();

return queue1 ;

}

可以看到如果android版本大于等于2.3则调用基于HttpURLConnection的HurlStack，否则就调用基于HttpClient的HttpClientStack。并创建了RequestQueue，调用了start()方法：

public void start () {

this . stop ();

this . mCacheDispatcher = new CacheDispatcher ( this . mCacheQueue , this . mNetworkQueue , this . mCache , this . mDelivery );

this . mCacheDispatcher . start ();

for ( int i = 0 ; i this . mDispatchers . length ; ++ i ) {

NetworkDispatcher networkDispatcher = new NetworkDispatcher ( this . mNetworkQueue , this . mNetwork , this . mCache , this . mDelivery );

this . mDispatchers [ i ] = networkDispatcher ;

networkDispatcher . start ();

}

}

CacheDispatcher是缓存调度线程，并调用了start()方法，在循环中调用了NetworkDispatcher的start()方法，NetworkDispatcher是网络调度线程，默认情况下mDispatchers.length为4，默认开启了4个网络调度线程，也就是说有5个线程在后台运行并等待请求的到来。接下来我们创建各种的Request，并调用RequestQueue的add()方法：

public Request add ( Request request ) {

request . setRequestQueue ( this );

Set var2

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