Volley使用小结二

来源：互联网发布：逆战帮豆软件叫什么编辑：程序博客网时间：2024/05/24 07:26

由于volley自身提供的JsonObjectRequest和JSONArrayRequest在post请求的时候，无法用getParams（）方法设置参数，所以参考了网上的老师通过集成Request基类重写的

JSONObjectPostRequest和JSONArrayPostRequest两个类。

1、JSONObjectPostRequest类

import java.io.UnsupportedEncodingException;
import java.util.Map;
import org.json.JSONException;
import org.json.JSONObject;
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;

public class JSONObjectPostRequest extends Request<JSONObject>{

   private Map<String, String> mMap;
    private Listener<JSONObject> mListener;
    public JSONObjectPostRequest(String url, Listener<JSONObject> listener,ErrorListener errorListener, Map<String, String> map) {
       super(Request.Method.POST, url, errorListener);
       mListener=listener;
       mMap=map;
    }

    //mMap是已经按照前面的方式,设置了参数的实例
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        return mMap;
    }

    //此处因为response返回值需要json数据,和JsonObjectRequest类一样即可
    @Override
    protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
        try {
            String jsonString = new String(response.data,HttpHeaderParser.parseCharset(response.headers));
            return Response.success(new JSONObject(jsonString),HttpHeaderParser.parseCacheHeaders(response));
        } catch (UnsupportedEncodingException e) {
            return Response.error(new ParseError(e));
        } catch (JSONException je) {
            return Response.error(new ParseError(je));
        }
    }

    @Override
    protected void deliverResponse(JSONObject response) {
        mListener.onResponse(response);
    }
}

2、JSONArrayPostRequest

import java.io.UnsupportedEncodingException;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONException;
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;

public class JSONArrayPostRequest extends Request<JSONArray>{
   private Map<String,String> mMap;
   private Listener<JSONArray> mListener;

   public JSONArrayPostRequest(String url,Listener<JSONArray> listener,ErrorListener errorListener, Map<String, String> map) {
       super(Request.Method.POST, url, errorListener);
       mListener=listener;
       mMap=map;
   }

   //mMap是已经按照前面的方式,设置了参数的实例
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        return mMap;
    }

   @Override
   protected Response<JSONArray> parseNetworkResponse(NetworkResponse response) {
       try{
           String jsonString=new String(response.data,HttpHeaderParser.parseCharset(response.headers));
              return Response.success(new JSONArray(jsonString),HttpHeaderParser.parseCacheHeaders(response));
            } catch (UnsupportedEncodingException e) {
                return Response.error(new ParseError(e));
            } catch (JSONException je) {
                return Response.error(new ParseError(je));
            }
   }

   @Override
   protected void deliverResponse(JSONArray response) {
       mListener.onResponse(response);
   }
}

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