Question

我刚开始从我现有的网络库移植到Android的Volley。到目前为止，我已经成功实施了Volleys ImageLoader。现在，我正在尝试启动并运行我的第一个http调用，但是我发现了这个错误。

注意：我故意以PATCH请求开始，因为我会经常使用它们。另外，我的Volley DOES版本支持补丁： https://android.googlesource.com/platform/frameworks/volley/+/master/src/com/android/volley/Request.java https://android.googlesource.com/platform/frameworks/volley/+/master/src/com/android/volley/toolbox/HurlStack.java

堆栈跟踪：

E/InputDialogFragment(27940): VolleyError: java.net.ProtocolException: Connection already established
D/Volley  (27940): [1] MarkerLog.finish: (67   ms) [ ] https://mobile.example.com/m/api/v1/user/ 0xb33a3c8d NORMAL 2
D/Volley  (27940): [1] MarkerLog.finish: (+0   ) [ 1] add-to-queue
D/Volley  (27940): [1] MarkerLog.finish: (+0   ) [544] cache-queue-take
D/Volley  (27940): [1] MarkerLog.finish: (+0   ) [544] cache-miss
D/Volley  (27940): [1] MarkerLog.finish: (+0   ) [545] network-queue-take
D/Volley  (27940): [1] MarkerLog.finish: (+14  ) [545] post-error
D/Volley  (27940): [1] MarkerLog.finish: (+53  ) [ 1] done

PATCH请求

    HashMap<String, Object> values = new HashMap<String, Object>();
    values.put(mParam, val);
    JsonObjectRequest request = new JsonObjectRequest(Request.Method.PATCH, APIConstants.URL_USER, new JSONObject(values),
        new Response.Listener<JSONObject>(){
            @Override
            public void onResponse(JSONObject response){
               // Blah do stuff here 
                mProgressDialog.dismiss();
            }
        },
        new Response.ErrorListener(){
            @Override
            public void onErrorResponse(VolleyError error){
                Log.e(TAG, "VolleyError: " + error.getMessage());
            }
        }){
            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                HashMap<String, String> headers = new HashMap<String, String>();
                VolleySingleton.getInstance().addCookie(headers);
                return headers;
            }
    };
    VolleySingleton.getInstance().getRequestQueue().add(request);

是的，我计划最终为StringRequest，JsonObjectRequest等构建类......但是目前我只想让它运行起来。

另外，如果您对addCookie感到疑惑，我现在更喜欢将我的cookie保存在首选项中，因为我对CookieManager并不熟悉。

VolleySingleton

public class VolleySingleton {
    private static final String COOKIE_KEY = "Cookie";
    private static VolleySingleton mInstance = null;
    private RequestQueue mRequestQueue;
    private ImageLoader mImageLoader;
    private SharedPreferences mPreferences;
    private VolleySingleton(){
        mRequestQueue = Volley.newRequestQueue(MyApplication.getAppContext());
        mImageLoader = new ImageLoader(this.mRequestQueue, new ImageLoader.ImageCache() {
            private final LruCache<String, Bitmap> mCache = new LruCache<String, Bitmap>(10);
            public void putBitmap(String url, Bitmap bitmap) {
                mCache.put(url, bitmap);
            }
            public Bitmap getBitmap(String url) {
                return mCache.get(url);
            }
        });
        mPreferences = MyApplication.getAppContext().getSharedPreferences(PrefConstants.PREFERENCES, 0);
    }

    public static VolleySingleton getInstance(){
        if(mInstance == null){
            mInstance = new VolleySingleton();
        }
        return mInstance;
    }

    public RequestQueue getRequestQueue(){
        return this.mRequestQueue;
    }

    public ImageLoader getImageLoader(){
        return this.mImageLoader;
    }

    public final void addCookie(Map<String, String> headers) {
        String cookie = mPreferences.getString(PrefConstants.PREF_COOKIE, null);
        if(cookie != null){
            headers.put(COOKIE_KEY, cookie);
        }
    }
}

Answer 1

问题：

Volleys HurlStack（HttpUrlConnection）确实有PATCH的支持代码。但是，每当您尝试发出PATCH请求时，它似乎仍会抛出我的标题和堆栈跟踪中发布的异常。

黑客解决方案：

1）强制Volley使用HttpClientStack。

以下是我的VolleySingleton构造函数的更新版本。这“有效”，但显然浪费了Hurl实现，如果（Build.VERSION.SDK_INT＆gt; = 9）则认为更好。不用说谷歌计划将来完全从apache HttpClient转移。

private VolleySingleton(){
    mPreferences = MyApplication.getAppContext().getSharedPreferences(PrefConstants.PREFERENCES, 0);

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

    HttpStack httpStack = new HttpClientStack(AndroidHttpClient.newInstance(userAgent));
    mRequestQueue = Volley.newRequestQueue(MyApplication.getAppContext(), httpStack);
    mImageLoader = new ImageLoader(this.mRequestQueue, new ImageLoader.ImageCache() {
        private final LruCache<String, Bitmap> mCache = new LruCache<String, Bitmap>(10);
        public void putBitmap(String url, Bitmap bitmap) {
            mCache.put(url, bitmap);
        }
        public Bitmap getBitmap(String url) {
            return mCache.get(url);
        }
    });
}

2）继续使用上面的VolleySingleton进行补丁;将其重命名为VolleySingletonPatch（），然后为所有其他NON-PATCH调用创建一个Default VolleySingleton（）。（优于1，但仍然不是最优的）

3）尽管Volley已经实现了PATCH，但解决了HurlStack中抛出的异常。这将是最好的，但我更愿意避免直接修补Volley或不必要地扩展我自己的HttpStack。

我要留下这个没有答案的，因为我非常感谢任何洞察力，当然还有比我在这里提出的更好的选择。

Answer 2

我也有这个问题，我的解决方案就是放弃底层的内置Apache HTTP组件，并使用来自Square的OkHttp库，使用this HttpStack implementation作为Volley，使用OkHttp作为其传输。效果很好。

Answer 3

我知道这个问题很旧，但是提供解决方案可以帮助尚未遇到相同挑战的人

JSONObject param = new JSONObject();
    try {
        param.put(KEY 1, VALUE 1);
        param.put(KEY 2, VALUE 2);

    } catch (JSONException e) {
        e.printStackTrace();
    }

        //ID represents the id for the record to update
    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.PATCH, YOUR URL+ "?ID=" + ID, param,
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                 //call handler to display response (optional)

                }
            }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            //call handler to display response (optional)

        }

    }) {

        //            Passing header
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            HashMap<String, String> headers = new HashMap<String, String>();
            headers.put("Content-Type", "application/json; charset=utf-8");
            headers.put("x-api-key", "YOUR API KEY");
            return headers;
        }

        @Override
        protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {

           //use this to check positive response code returned else remove this override part

            return super.parseNetworkResponse(response);
        }
    };
    //and then you pass json data to volley
    VolleySingleton.getInstance(getActivity()).addToRequestQueue(jsonObjReq);

Android：Volley HTTP补丁请求

3 个答案: