Android 使用volley过程中遇到的问题解决办法

Android 使用volley过程中遇到的问题解决办法

本文主要介绍使用 volley 过程中遇到的问题，错误提示：

com.android.volley.NoConnectionError: java.io.InterruptedIOException”，内容加载失败，问题出在重复调用 queue.start() 方法。

错误提示：com.android.volley.NoConnectionError: java.io.InterruptedIOException”，然后就内容加载失败。。。、

代码如下：

private void getWxpayOrderInfo() {
 StringRequest stringRequest = new StringRequest(Request.Method.POST,
 Url, new Response.Listener<String>() {
  @Override
  public void onResponse(String response) {
  }
 }, new Response.ErrorListener() {
  @Override
  public void onErrorResponse(VolleyError error) {
  }
 }) {
  @Override
  protected Map<String, String> getParams()
  throws AuthFailureError {
   // 发送请求用到的一些参数
   Map<String, String> params = new HashMap<String, String>();
   params.put("id", "nameid");
   return params;
  }
 };
 stringRequest.setRetryPolicy(new DefaultRetryPolicy(10000,
                DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
 queue.add(stringRequest);
 //queue.start(); //经过反复调试错误就出在这里，注释掉这里就可以了
}

问题出在调用 queue.start() 方法之后，错误原因可以通过 volley 源文件看到，以下是 volley 官方文档中初始化 RequestQueue 的一段代码。

/**
 * Creates a default instance of the worker pool and calls {@link RequestQueue#start()} on it.
 *
 * @param context A {@link Context} to use for creating the cache dir.
 * @param stack  An {@link HttpStack} to use for the network, or null for default.
 * @return A started {@link RequestQueue} instance.
 */
public static RequestQueue newRequestQueue(Context context, HttpStack stack) {
 File cacheDir = new File(context.getCacheDir(), DEFAULT_CACHE_DIR);
 String userAgent = "volley/0";
 try {
  String packageName = context.getPackageName();
  PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0);
  userAgent = packageName + "/" + info.versionCode;
 } catch (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));
  }
 }
 Network network = new BasicNetwork(stack);
 RequestQueue queue = new RequestQueue(new DiskBasedCache(cacheDir), network);
 queue.start();//这里需要注意，原来在请求初始化的时候就已经调用了start方法
 return queue;
}

/**
 * Starts the dispatchers in this queue.
 */
public void start() {
 stop(); // Make sure any currently running dispatchers are stopped.
 // Create the cache dispatcher and start it.
 mCacheDispatcher = new CacheDispatcher(mCacheQueue, mNetworkQueue, mCache, mDelivery);
 mCacheDispatcher.start();
 // Create network dispatchers (and corresponding threads) up to the pool size.
 for (int i = 0; i < mDispatchers.length; i++) {
  NetworkDispatcher networkDispatcher = new NetworkDispatcher(mNetworkQueue, mNetwork,
    mCache, mDelivery);
  mDispatchers[i] = networkDispatcher;
  networkDispatcher.start();
 }
}

/**
 * Stops the cache and network dispatchers.
 */
public void stop() {
 if (mCacheDispatcher != null) {
  mCacheDispatcher.quit();
 }
 for (int i = 0; i < mDispatchers.length; i++) {
  if (mDispatchers[i] != null) {
   mDispatchers[i].quit();
  }
 }
}

/**
* Forces this dispatcher to quit immediately. If any requests are still in
* the queue, they are not guaranteed to be processed.
*/
public void quit() {
 mQuit = true;
 interrupt();
}

public void interrupt() {
 // Interrupt this thread before running actions so that other
 // threads that observe the interrupt as a result of an action
 // will see that this thread is in the interrupted state.
 nativeInterrupt();
 synchronized (interruptActions) {
  for (int i = interruptActions.size() - 1; i >= 0; i--) {
   interruptActions.get(i).run();
  }
 }
}

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