使用Volley with JsonObjectRequest时无法从PHP获取参数

Question

我正在使用Volley框架和JsonObjectRequest请求.我在用

JsonObjectRequest loginRequest = new JsonObjectRequest(b.toString(), params,
        new Listener<JSONObject>() {},
                    new Response.ErrorListener() {});

该params变量包含参数,它是一个JSONObject.

问题是我无法在PHP代码中访问任何这些变量.$ _POST或$ _REQUEST变量什么都没给我.

我也尝试过类似下面的东西,但没有运气.

$data = json_decode(file_get_contents("php://input"));

Answer 1

我在使用我的PHP API时遇到了同样的问题.事实证明,一个JSONObjectparams作为JSON发送.因此,PHP $ _POST将无法识别它,因为它不是以下格式:param1=value1&param2=value

试试看: print file_get_contents("php://input");

对我来说,解决方案是创建一个扩展Request<JSONObject>而不是使用的解决方法类JsonObjectRequest

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.AuthFailureError;
import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.toolbox.HttpHeaderParser;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
* Custom Request Class for JSON
*/
public class CustomRequest extends Request<JSONObject> {

    private List params; // the request params
    private Response.Listener<JSONObject> listener; // the response listener

    public CustomRequest(int requestMethod, String url, List params,
        Response.Listener<JSONObject> responseListener, Response.ErrorListener errorListener) {

        super(requestMethod, url, errorListener); // Call parent constructor
        this.params = params;
        this.listener = responseListener;
    }

    // We have to implement this function
    @Override
    protected void deliverResponse(JSONObject response) {
        listener.onResponse(response); // Call response listener
    }

    // Proper parameter behavior
    @Override
    public Map <String, String> getParams() throws AuthFailureError {
        Map <String, String> map = new HashMap <String, String>();

        // Iterate through the params and add them to our HashMap
        for (BasicNameValuePair pair: params) {
            map.put(pair.getName(), pair.getValue());
        }

        return map;
    }

    // Same as JsonObjectRequest#parseNetworkResponse
    @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));
        }
    }

}