如何发送请求标题是“Content-Type”：" application / json"当排球得分时 [英] How to send request Header is "Content-Type":"application/json" when GET on Volley

问题描述

我尝试在Volley上使用GET，但我需要发送请求到 application / json 。

I try to use GET on Volley , but i need send request to application/json .

I看看一些答案，我尝试使用 jsonBody ，但它显示错误：

I take a look for some answers , i try to use jsonBody , but it shows error:

null com.android.volley.ServerError

null com.android.volley.ServerError

这是我的代码：

public class MainActivity extends AppCompatActivity {

    String url = "http://114.35.246.42:2212/MobileApp/DEST_WebService.asmx/GetNews";
    JSONObject jsonBody;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        try {
            //I try to use this for send Header is application/json
            jsonBody = new JSONObject("{\"type\":\"example\"}");
        } catch (JSONException ex) {
            ex.printStackTrace();
        }

        RequestQueue mQueue = Volley.newRequestQueue(getApplicationContext());

        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(url, jsonBody,
                new Response.Listener<JSONObject>() {


                    @Override
                    public void onResponse(JSONObject response) {
                        Log.d("TAG", response.toString());
                    }
                }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e("TAG", error.getMessage(), error);
            }


        });


        mQueue.add(jsonObjectRequest);

    }


}

有人可以教我如何解决这个问题，任何帮助都会受到赞赏。

Is any one can teach me how to fix this , any help would be appreciated.

这是我的网址：
String url =http://114.35.246.42:2212/MobileApp/DEST_WebService.asmx/GetNews;

推荐答案

@Override 
public Map<String, String> getHeaders() throws AuthFailureError { 
    Map<String, String> params = new HashMap<String, String>();                
    params.put("Content-Type", "application/json");
    return params; 
} 

在你的实施

public class MainActivity extends AppCompatActivity {

    String url = "http://114.35.246.42:2212/MobileApp/DEST_WebService.asmx/GetNews";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RequestQueue mQueue = Volley.newRequestQueue(getApplicationContext());

        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(url, jsonBody,
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    Log.d("TAG", response.toString());
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Log.e("TAG", error.getMessage(), error);
                }
            }) { //no semicolon or coma
            @Override 
            public Map<String, String> getHeaders() throws AuthFailureError { 
                Map<String, String> params = new HashMap<String, String>();                
                params.put("Content-Type", "application/json");
                return params; 
            } 
        };
        mQueue.add(jsonObjectRequest);
    }
}

这篇关于如何发送请求标题是“Content-Type”：" application / json"当排球得分时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！