volley 之GsonRequest

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这是之前写的http://www.cnblogs.com/freexiaoyu/p/3955137.html

关于GsonReques的用户，这个在POST请求传参数的时候GsonRequest构造第四个参数(POST请求参数）的时候接收不到参数原因是原来的类没有重写一个写法

@Override
protected Map<String, String> getParams() throws AuthFailureError {
return params;
}

用原来的方法想要实现POST参数请求只能在Response.ErrorListener后面重写getParams，下面请求方法中构造为null的就是传递params

GsonRequest<ResultModel> gsonRequest=new GsonRequest<ResultModel>

                (Request.Method.POST, AppConfig.APIURL, ResultModel.class, null, new Response.Listener<ResultModel>() {

                    @Override

                    public void onResponse(ResultModel response) {

                        VolleyLog.e("Error: %s", "成功"+ response);

                    }

                }, new Response.ErrorListener() {

                    @Override

                    public void onErrorResponse(VolleyError error) {

                          VolleyLog.e("Error: %s", "失败"+ error);

                    }

                }){ 

                    @Override

                    protected Map<String, String> getParams()

                            throws AuthFailureError {

                        Map<String, String> params = new HashMap<String, String>();

                        //Post参数

                        return params;

                    }};

                    requestQueue.add(gsonRequest);

下面是一个完成的类


import java.io.UnsupportedEncodingException;

import java.util.Map;

import com.android.volley.AuthFailureError;

import com.android.volley.NetworkResponse;

import com.android.volley.ParseError;

import com.android.volley.Request;

import com.android.volley.Response;

import com.android.volley.Response.ErrorListener;

import com.android.volley.Response.Listener;

import com.android.volley.toolbox.HttpHeaderParser;

import com.google.gson.Gson;

import com.google.gson.JsonSyntaxException;

public class GsonRequest<T> extends Request<T> {

    private Gson mGson = new Gson();

    private Class<T> clazz;

    private Map<String, String> headers;

    private Map<String, String> params;

    private Listener<T> listener;

    /**

     * Make a GET request and return a parsed object from JSON.

     *

     * @param url URL of the request to make

     * @param clazz Relevant class object, for Gson's reflection

     */

    public GsonRequest(int method,

                       String url,

                       Class<T> clazz,

                       Listener<T> listener,

                       ErrorListener errorListener) {

        super(method, url, errorListener);

        this.clazz = clazz;

        this.listener = listener;

        mGson = new Gson();

    }

    /**

     * Make a POST request and return a parsed object from JSON.

     *

     * @param url URL of the request to make

     * @param clazz Relevant class object, for Gson's reflection

     */

    public GsonRequest(int method,

                       String url,

                       Class<T> clazz,

                       Map<String, String> params,

                       Listener<T> listener,

                       ErrorListener errorListener) {

        super(method, url, errorListener);

        this.clazz = clazz;

        this.params = params;

        this.listener = listener;

        this.headers = null;

        mGson = new Gson();

    }

    @Override

    public Map<String, String> getHeaders() throws AuthFailureError {

        return headers != null ? headers : super.getHeaders();

    }

    @Override

    protected Map<String, String> getParams() throws AuthFailureError {

        return params;

    }

    @Override

    protected void deliverResponse(T response) {

        listener.onResponse(response);

    }

    @Override

    protected Response<T> parseNetworkResponse(NetworkResponse response) {

        try {

            String json = new String(

                    response.data, HttpHeaderParser.parseCharset(response.headers));

            return Response.success(

                    mGson.fromJson(json, clazz), HttpHeaderParser.parseCacheHeaders(response));

        } catch (UnsupportedEncodingException e) {

            return Response.error(new ParseError(e));

        } catch (JsonSyntaxException e) {

            return Response.error(new ParseError(e));

        }

    }

}