I'm really new on android and I'm wokring on a login system, I'm using volley to post the data....the problem thatm I'm having is when i try to read the response....
the response looks like this:
{"st":"no","Message":"Error"}
I'm trying to access only st or message is there a way to do that ? I tried doing:
response[i] ----Array type expexted found ' org.json.JSONObject'
JsonObjectRequest jsonRequest = new JsonObjectRequest(Request.Method.POST, url, params, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
Log.e(TAG, "Response: " + response.length());
for (int i = 0; i < response.length(); i++) {
Log.e(TAG, "Values: " + response);
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
Volley.newRequestQueue(this).add(jsonRequest);
You could use
response.getString("Message")
to get a message from given JSON
#Override
public void onResponse(String response) {
try {
JSONObject api_response = new JSONObject(response);
String message = api_response.getString("Message")
} catch (JSONException e) {
e.printStackTrace();
}
Its important to catch the json exception just in case the response string cannot be converted to json object. Then use the getString() to get the message from the created json object.
Related
I know this question has been asked a few times and i have tried all the solutions however, nothing seems to work. My method:
public static LocationGeoData getLocationGeoData(Location location){
RequestQueue requestQueue = Volley.newRequestQueue(MyApplication.getAppContext());
Date dateNow = new Date();
SimpleDateFormat fmt = new SimpleDateFormat("yyyy.MM.dd");
String url = "MYCORRECTURL";
Log.d("geoData", "In getGeoData " + url); // this is called and logs
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url,
null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
Log.d("geoData", "inside the response");// this never gets called
try {
JSONObject jsonObject = response.getJSONObject("data");
for(int i = 0; i <jsonObject.length(); i++){
JSONObject heading = jsonObject;
if(heading.getString("field-value").equals("field-value")){
JSONObject totIntensity = heading.getJSONObject("total-intensity");
JSONObject declination = heading.getJSONObject("declination");
JSONObject inclination = heading.getJSONObject("inclination");
int totalIntensity = totIntensity.getInt("value");
double declinationValue = declination.getDouble("value");
double inclinationValue = inclination.getDouble("value");
locationGeoData = new LocationGeoData(totalIntensity, declinationValue, inclinationValue);
}
}
} catch (JSONException e) {
Log.d("geoData", "Error recorded");//never called
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d("geoData", "Error recorded");// never called
}
});
requestQueue.add(request);
return locationGeoData;
}
The second Log message inside the response never gets called, i get no error messages, my url works and i can see the JsonOBject in the browser when tested, but the response is never called in my method. Can anyone advise me what i am doing wrong?
The image contains the data which has no array name and I need to get the data which is in the image using volley.Help me with the code for it.
You have to use a JSONArrayRequest . When you parse the response, it's a ready to use JSONArray object. You can loop the array to get your JSONObject items by position.
This has been covered in this thread -> Volley - Sending a POST request using JSONArrayRequest
String url="https://earthquake.usgs.gov/archive/product/nearby-cities/ci39269503/ci/1593242325224/nearby-cities.json";
JsonArrayRequest jsonArrayRequest=new JsonArrayRequest(Request.Method.GET, url, new Response.Listener() {
#Override
public void onResponse(JSONArray response) {
StringBuilder stringBuilder=new StringBuilder();
try {
for (int i=0;i<response.length();i++){
JSONObject citiesjsonObject=response.getJSONObject(i);
stringBuilder.append("Name : "+citiesjsonObject.getString("name")+
"\n"+"Distance : "+citiesjsonObject.getString("distance")+ "\n"
+"Population : "+citiesjsonObject.getString("population"));
stringBuilder.append("\n\n");
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue.add(jsonArrayRequest);
This question may look like a duplicate(it is NOT), but I am stuck with this JSONException error:
Value die of type java.lang.String cannot be converted to JSONArray.
I'm using JsonArrayRequest of Volley to get jsonarray from a server. My JsonArrayRequest is throwing the above error, as i want to post a string to the server and receive jsonarray as a response. Below is my code:
JsonArrayRequest jsonReq = new JsonArrayRequest(Request.Method.POST,
URL, null, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject JO = response.getJSONObject(i);
GetterSetter getterSetter = new GetterSetter();
getterSetter.setName(JO.getString("name"));
getterSetter.setNumber(JO.getString("number"));
getterSetter.setDate(JO.getString("date"));
myList.add(getterSetter);
} catch (JSONException e) {
e.printStackTrace();
}
}
myAdapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("myKey", myValue);
return params;
}
};
MySingleton.getInstance().addToRequestQueue(jsonReq);
}
The PHP file is working properly and it is passing json string to android.
The error is happening somewhere within onResponse block. The same block works clean when using StringRequest instead of JsonArrayRequest.
Any idea what exactly is causing this error? Any help or guidance is much appreciated.
* I'm new in Android Volley and the way it works.
EDIT
This is a format/syntax of the url response:
[
{"name":"test",
"number":"123",
"date":"2017-08-22"
},
{"name":"test1",
"number":"1234",
"date":"2017-08-23"
}
]
Try using StringRequest and then create your own JSONArray from the response string:
new JSONArray(response);
You can find example StringRequest from the documentation:
Sending a Simple Request
I've tried with normal JSONArrayRequests and StringRequests and everything was fine untill now. I want to send an JSONArrayRequest with POST parameters to get some MySQL result in JSON format from the script. Unfortunately I get [] everytime in response. I have checked .php file and query with _GET method and the script worked perfectly returning desired rows in Json format.
I read here (https://stackoverflow.com/a/18052417/4959185) Volley Team have added JSONArrayRequest with _POST parameter to their class. However it does not work in my case. Could you please look what is wrong with that function:
private void getFavouriteRecipes(final String userUniqueId, final int offset) {
JsonArrayRequest favouriteRecipesReq = new JsonArrayRequest(Request.Method.POST,
AppConfig.URL_GETFAVOURITERECIPES, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d("odpowiedz", "Odpowiedź ulubionych: " + response);
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jObj = response.getJSONObject(i);
RecipeItem recipeItem = new RecipeItem();
recipeItem.setRecipeUniqueID(jObj.getString("unique_id"));
recipeItem.setRecipeTitle(jObj.getString("title"));
recipeItem.setRecipeImgThumbnailLink(jObj.getString(
"img_tumbnail_link"));
recipeItem.setRecipeAddAte(jObj.getString("add_date"));
recipeItem.setRecipeKitchenType(jObj.getString("kitchen_type"));
recipeItem.setRecipeMealType(jObj.getString("meal_type"));
recipeItem.setRecipeName(jObj.getString("name"));
recipeItem.setRecipeSurname(jObj.getString("surname"));
recipeItem.setRecipeLikeCount(jObj.getString("like_count"));
recipeFavouriteItems.add(recipeItem);
} catch (JSONException e) {
e.printStackTrace();
showSnackbarInfo("Błąd Json: " + e.getMessage(),
R.color.snackbar_error_msg);
}
}
recipeFavouriteItemsAdapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("odpowiedz", "Błąd pobierania ulubionych: " +
Integer.toString(error.networkResponse.statusCode));
showSnackbarInfo(Integer.toString(error.networkResponse.statusCode),
R.color.snackbar_error_msg);
}
}) {
#Override
protected Map<String, String> getParams() {
// Posting Parameters to Login URL
Map<String, String> params = new HashMap<>();
params.put("user_unique_id", userUniqueId);
params.put("offset", Integer.toString(offset));
Log.d(TAG, "wysylam parametry: " + userUniqueId + ", " + Integer.toString(offset));
return params;
}
};
// Adding Request to Request Queue
AppController.getInstance().addToRequestQueue(favouriteRecipesReq);
}
My PHP Script:
https://ideone.com/ZxYzHr
I have found another way to get JSONArrayResponse with sending parameters. I think that will help somebody.
U just write standard JSONArrayRequest liek this:
JsonArrayRequest favouriteRecipesReq = new JsonArrayRequest(prepareGetMethodUrl(),
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d("odpowiedz", "Odpowiedź ulubionych: " + response.toString());
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jObj = response.getJSONObject(i);
RecipeItem recipeItem = new RecipeItem();
recipeItem.setRecipeUniqueID(jObj.getString("unique_id"));
recipeItem.setRecipeTitle(jObj.getString("title"));
recipeItem.setRecipeImgThumbnailLink(jObj.getString(
"img_tumbnail_link"));
recipeItem.setRecipeAddAte(jObj.getString("add_date"));
recipeItem.setRecipeKitchenType(jObj.getString("kitchen_type"));
recipeItem.setRecipeMealType(jObj.getString("meal_type"));
recipeItem.setRecipeName(jObj.getString("name"));
recipeItem.setRecipeSurname(jObj.getString("surname"));
recipeItem.setRecipeLikeCount(jObj.getString("like_count"));
recipeFavouriteItems.add(recipeItem);
} catch (JSONException e) {
e.printStackTrace();
}
}
recipeFavouriteItemsAdapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("odpowiedz", "Błąd pobierania ulubionych: " +
Integer.toString(error.networkResponse.statusCode));
showSnackbarInfo(Integer.toString(error.networkResponse.statusCode),
R.color.snackbar_error_msg);
}
});
// Adding Request to Request Queue
AppController.getInstance().addToRequestQueue(favouriteRecipesReq);
Instead of standard URL to the PHP script I inserted function returning String called prepareGetMethodUrl().
Let's look inside it:
private String prepareGetMethodUrl() {
return AppConfig.URL_GETFAVOURITERECIPES + "?user_unique_id=" + userUniqueId + "&offset=" +
Integer.toString(offset);
}
As you can see it's very simple. I get standard AppConfig.URL_GETFAVOURITERECIPES which is static field in AppConfig class conatining direct link to my PHP script on my serwer f.e http://www.someserversite.com/my_api/gmy_php_script.php and combine it with parametres values I need to send to the script: user_unique_id and it's content userUniqueId and offset which content is offset parsed from int to String.
Inside my script I just call:
<?php
// some code
// Receiving The Post Params
$user_unique_id = $_GET['user_unique_id'];
$offset = $_GET['offset'];
echo $user_unique_id . "<br />";
echo $offset;
?>
I feel like this is a very basic concept missunderstanding. In my Android app I make HTTP requests using Volley lib. At first I made the requests through a JsonObjectRequest in the Activity code and worked right, but now I separated the request code in a class apart so I can call it from any Activity. The new class has a method that returns the requested JSONObject but any "json action" I do over the returned object ends in an error.
Here is the new class code, JSONRequests:
public class JSONRequests {
private JSONObject mResponse;
private String mURL = "https://myurl.com/";
public JSONObject getJSONObject(final String credentials, final String path) {
final JsonObjectRequest mRequest = new JsonObjectRequest(mURL.concat(path), null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
mResponse = response;
try {
Log.d("RESPONSE", mResponse.getString("id")); // It works here
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}
) {
#Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers = new HashMap<String, String>();
headers.put("Authorization", "Basic " + credentials);
return headers;
}
};
MyApplication.getInstance().getRequestQueue().add(mRequest);
return mResponse;
}
}
And here is how I call getJSONObject from MyActivity:
JSONRequests mRequest = new JSONRequests();
JSONObject mInfo = mRequest.getJSONObject(mEncodedCredentials, mPath);
try {
Log.d("RESPONSE", mInfo.getString("id")); // This doesn't work
} catch (JSONException e) {
e.printStackTrace();
}
When in the Activity file, I used "response" as a JSONObject and it worked, but now separated it won't. I don't know if is a error with JSONObject or just that I'm not getting the returned object in the correct way. Thanks in advance.