I try to use GET on Volley , but i need send request to application/json
.
I take a look for some answers , i try to use jsonBody
, but it shows error:
null com.android.volley.ServerError
Here is my code:
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);
}
}
Is any one can teach me how to fix this , any help would be appreciated.
Here is my url:
String url = "http://114.35.246.42:2212/MobileApp/DEST_WebService.asmx/GetNews";
If you need to add custom headers to your volley requests, you can't do this after initialisation, as the headers are saved in a private variable. Instead, you need to override the getHeaders() method of Request.
Content-Type: application/json is just the content header. The content header is just information about the type of returned data, ex::JSON,image(png,jpg,etc..),html. Keep in mind, that JSON in JavaScript is an array or object.
The Content-Type header is used in web requests to indicate what type of media or resource is being used in the request or response. When you send data in a request such as PUT or POST, you pass the Content-Type header to tell the server what type of data it is receiving.
Content-Type. application/json. Indicates that the request body format is JSON. application/xml. Indicates that the request body format is XML.
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("Content-Type", "application/json");
return params;
}
Implementation in your's
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);
}
}
In general for setting a custom header you need to override getHeaders
and set the custom header manually. However, volley handles content type headers differently and getHeaders
way does not always work.
So for your case you need to override getBodyContentType
. So your code will look like
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);
}
}){
@Override
public String getBodyContentType(){
return "application/json";
}
};
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