Develop Reference

How to send ArrayList using volley in android?

How to send ArrayList using volley in android,
How to use ArrayList in HashMap?
like Map<String, ArrayList<String> params ;

Finally I got a easiest and perfect solution:
use this dependency:
implementation 'com.google.code.gson:gson:2.8.2'
and use this line
String data = new Gson().toJson(myArrayList);
Now you can pass this string into volley as string parameters like bellow example.
Example:
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<>();
String data = new Gson().toJson(myArrayList);
params.put("keyName", data);
return params;
}
Working for me.

i don't know How to use ArrayList in HashMap?
BUT!!!
for sending ArrayList using volley you can do this
private void sendData(ArrayList list) throws JSONException {
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.POST, YOUR_URL, setJsonObject(list)/*This is the function you need*/, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage(),Toast.LENGTH_SHORT).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(LogInActivity.this);
requestQueue.add(jsonObjReq);
}
//create json object that contain ArrayList contents
private JSONObject setJsonObject(َArrayList list) throws JSONException {
JSONObject jsonobject_one = new JSONObject();
JSONArray jsonArray = new JSONArray();
for(int i =0 ; i<list.size ; i++) {
JSONObject jsonobject = new JSONObject();
jsonobject .put("param"+i, list.get(i) );
jsonArray.put(jsonobject);
}
jsonobject_one.put("params_array",jsonArray);
return jsonobject_one;
}

How to create a post request in volley android with parameters

I am building an android application that should communicates with the server using volley, it sends the server a request with data in it that should be processed on server and results, sent back.
I am always getting an error from the server, and It's most probably because I couldn't build the request right.
This is the format of the request :
POST API/{RESOURCE}
Content-type: application/json
{
"documents" :
[
{ "image" : "<base64-encoded image>", "type": "id_front or id_back" },
{ "image" : "<base64-encoded image>", "type": "id_front or id_back" }
…
],
"token" : "<access_token_string>"
}
This is how i tried to achieve it, is it right ? I am not sure if the problem is with this code but it's most probable that it's in it.
JSONObject parameters = new JSONObject();
JSONObject[] jsonObjects;
jsonObjects = new JSONObject[1];
try {
Map<String , String> im = new HashMap<>();
im.put("image",imageStringBase64);
im.put("type","id_front");
jsonObjects[0] = new JSONObject(im);
parameters = parameters.put("token", "****");
parameters= parameters.put("documents", jsonObjects);
} catch (JSONException e) {
e.printStackTrace();
}
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, API_URL, parameters, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
StringBuilder formattedResult = new StringBuilder();
formattedResult.append(response);
Log.d(TAG, "jsonObjectResponse : " + response.toString());
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "ErrorResponse called " + "error code: " + error.networkResponse.statusCode);
}
})
{
/** Passing some request headers* */
#Override
public Map getHeaders() throws AuthFailureError {
HashMap headers = new HashMap();
headers.put("Content-Type", "application/json");
return headers;
}
};
mQueue.add(jsonObjectRequest);

Try building your request like below:
JSONObject requestObj;
try {
requestObj = new JSONObject();
JSONArray arr = new JSONArray();
JSONObject obj1 = new JSONObject();
obj1.put("image", imageStringBase64);
obj1.put("type","id_front");
JSONObject obj2 = new JSONObject();
obj2.put("image", imageStringBase64);
obj2.put("type","id_back");
arr.put(obj1);
arr.put(obj2);
requestObj.put("documents", arr);
requestObj.put("token", "****");
} catch (JSONException e) {
e.printStackTrace();
}
JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, requestObj,
listener, errorListener);

Recycler View Not Reading Big Volley data with params in android

I am using volley to receive the data from a data source, the problem is with the recycler view if I do something on a query like adding parameters it does not work. It there is any problem with the Volley?
public void getting locations() {
String url = "URL REMOVED";
RequestQueue queue = Volley.newRequestQueue(MainActivity.this); // this = context
JsonObjectRequest jsonObjReq = new JsonObjectRequest(
Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
JSONObject status = null;
try {
JSONObject jObj = new JSONObject(String.valueOf(response));
JSONArray jr = jObj.getJSONArray("products");
for(int i=0;i<jr.length();i++)
{
JSONObject jb1 = jr.getJSONObject(i);
String title = jb1.getString("title");
Log.d("Title",""+title);
String img = jb1.getString("featured_src");
JSONArray a = jb1.getJSONArray("categories");
String category = "";
lstBook.add(new Book(title,"rAJA","Description book",img));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("EROOOOOOOOOOOOOOOOOOOOOR", "Error: " + error.getMessage());
}
}) {
#Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers = new HashMap<String, String>();
headers.put("Content-Type", "application/json; charset=utf-8");
headers.put("User-agent", "My useragent");
return headers;
}
};
jsonObjReq.setRetryPolicy(new DefaultRetryPolicy(5000,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
queue.add(jsonObjReq);
}
The problem is if the URL is products it will show the data otherwise it will not.

Declare myAdapter as a private variable and change the code as mentioned below.
Add the line myAdapter.notifyDataSetChanged(); after lstBook.add(new Book(title,"rAJA","Description book",img)); and myrv.setAdapter(myAdapter);
for(int i=0;i<jr.length();i++)
{
JSONObject jb1 = jr.getJSONObject(i);
String title = jb1.getString("title");
String img = jb1.getString("featured_src");
JSONArray a = jb1.getJSONArray("categories");
String category = "";
lstBook.add(new Book(title,"rAJA","Description book",img));
myAdapter.notifyDataSetChanged();
}
and
myAdapter = new RecyclerViewAdapter(this,lstBook);
myrv.setLayoutManager(new GridLayoutManager(this,2));
myrv.setAdapter(myAdapter);
myAdapter.notifyDataSetChanged();

How to store volley response into HashMap?

i have created HashMap and JsonArrayRequest object as follows. Response is successfully retrieved but HashMap object url_maps size is zero.I want to use for loop in url_maps.
HashMap<String,String> url_maps = new HashMap<String, String>();
// Creating volley request obj for Banner
JsonArrayRequest bannerReq = new JsonArrayRequest(bannerUrl,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d(msg, response.toString());
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
url_maps.put("static key", "static value );
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
//adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(msg, "Error: " + error.getMessage());
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(bannerReq);

maybe you can change:
url_maps.put("static key", "static value );
to:
url_maps.put(obj.getString("static key"),obj.getString("static value"));

Try this.
public static void jsonToMap(String t) throws JSONException {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject jObject = new JSONObject(t);
Iterator<?> keys = jObject.keys();
while( keys.hasNext() ){
String key = (String)keys.next();
String value = jObject.getString(key);
map.put(key, value);
}
System.out.println("json : "+jObject);
System.out.println("map : "+map);
}

Volley POST REQUEST error 500

JSON:
{
"isRegistrationSuccess":"true"
}
This what my backend should provide while user successfully register in system. I am sending Name, Email and Password as parameters. I am getting 500 error.
/Volley: [188] BasicNetwork.performRequest: Unexpected response code 500 for http://100.100.202.200/mobile/register?name=admin&email=admin#nomail.com&password=admin123
Although, I can see the user information in my backend. Here is my code:
RequestQueue queue = Volley.newRequestQueue(this);
String url_to_parse = getLink(name,email,password).trim();
StringRequest stringReq = new StringRequest(Request.Method.POST, url_to_parse, new Response.Listener<String>() {
#Override
public void onResponse(String response){
try{
Log.d("Response",response);
JSONArray obj = new JSONArray();
boolean isLoginSuccess = Boolean.parseBoolean(obj.getString(0));
if(isLoginSuccess){
onSignupSuccess();
}else{
onSignupFailed();
}
}catch (JSONException e){
e.printStackTrace();
onSignupFailed();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
onSignupFailed();
Log.e("Error",String.valueOf(error.getMessage()));
}
});
queue.add(stringReq);
I am not sure what is wrong I am doing here? How can I solve it?

POST data is given in a protected Map getParams () and not the URL:
#Override
protected Map<String,String> getParams(){
Map<String,String> params = new HashMap<String, String>();
params.put("parametr1","value1");
params.put("parametr2","value2");
params.put("parametr3","value3");
return params;
}
#Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String,String> params = new HashMap<String, String>();
params.put("Content-Type","application/x-www-form-urlencoded");
return params;
}
Fix your url and use JsonObjectRequest

You want to parse a array into a boolean, you have to loop through the array like this:
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray= jsonObject.getJSONArray("example");
if (jsonArray.length() != 0) {
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jo = jsonArray.getJSONObject(i);
boolean isLoginSuccess = Boolean.parseBoolean(jo.getString("exampleString"));
}
}