Question

通过Volley源代码，看来请求的setSequence方法是无用的。在RequestQueue.add（Request）方法中，似乎将Requests以添加的原始序列添加，因为这将表示行：

request.setSequence(getSequenceNumber());

（getSequenceNumber（）只返回一个增量计数器）。有没有办法订购请求，还是我应该进一步攻击Volley？

Answer 1

使用Priority

private Priority mPriority = Priority.LOW;

@Override
public Priority getPriority() {
    return mPriority;
}

public void setPriority(Priority priority) {
    mPriority = priority;
}

更多详情here。

Answer 2

您无法向订单发出请求，但您可以让它们一个接一个地运行。为此，您需要实现自己的 RequestQueue 。

下面的示例演示了如何使所有请求以相同的顺序执行，并将它们添加到队列中，因为它使用单线程执行。

// Copied from Volley.newRequestQueue(..); source code
File cacheDir = new File(context.getCacheDir(), "def_cahce_dir");

String userAgent = "volley/0";
try {
    String packageName = context.getPackageName();
    PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0);
    userAgent = packageName + "/" + info.versionCode;
} catch (PackageManager.NameNotFoundException e) {
}

if (stack == null) {
    if (Build.VERSION.SDK_INT >= 9) {
        stack = new HurlStack();
    } else {
        // Prior to Gingerbread, HttpUrlConnection was unreliable.
        // See: http://android-developers.blogspot.com/2011/09/androids-http-clients.html
        stack = new HttpClientStack(AndroidHttpClient.newInstance(userAgent));
    }
}

int threadPoolSize = 1; // means only one request at a time
RequestQueue queue = new RequestQueue(new DiskBasedCache(cacheDir), network, threadPoolSize);
queue.start();

android Volley - Request.setSequence没用？

2 个答案: