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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