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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