How to Use the Android Volley API

How do you use the Android Volley API?

Edit: finally here it is an official training about "Volley library"

I found some examples about Volley library

• 6 examples by Ognyan Bankov :

  • Simple request
  • JSON request
  • Gson request
  • Image loading
  • with newer external HttpClient (4.2.3)
  • With Self-Signed SSL Certificate.

• one good simple example by Paresh Mayani

• other example by HARDIK TRIVEDI

• (NEW) Android working with Volley Library by Ravi Tamada

Hope this helps you

How to read values from an API using volley?

Assuming that sections: {...} is the response

You're trying to read sections as a JSONArray but is an object, you have to read it like this:

jsonObject = new JSONObject(String.valueOf(response));
Iterator<String> sectionKeys = jsonObject.keys();
while(sectionKeys.hasNext()){
   String sectionKey = iter.next();
   if (sectionKey.equals("enabled")) {
      Boolean enabled = jsonObject.getBoolean("enabled");
      ...
   } else {
      JSONObject sectionObject = jsonObject.getJSONObject(sectionKey);
      Boolean active = sectionObject.getBoolean("active")
      ...
   }
}

How to use POST request in android Volley library with params and header?

**Try this one **

    private void sendWorkPostRequest() {

        try {
            String URL = "";
            JSONObject jsonBody = new JSONObject();

            jsonBody.put("email", "abc@abc.com");
            jsonBody.put("password", "");
            jsonBody.put("user_type", "");
            jsonBody.put("company_id", "");
            jsonBody.put("status", "");

            JsonObjectRequest jsonOblect = new JsonObjectRequest(Request.Method.POST, URL, jsonBody, new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {

                    Toast.makeText(getApplicationContext(), "Response:  " + response.toString(), Toast.LENGTH_SHORT).show();
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {

                    onBackPressed();

                }
            }) {
                @Override
                public Map<String, String> getHeaders() throws AuthFailureError {
                    final Map<String, String> headers = new HashMap<>();
                    headers.put("Authorization", "Basic " + "c2FnYXJAa2FydHBheS5jb206cnMwM2UxQUp5RnQzNkQ5NDBxbjNmUDgzNVE3STAyNzI=");//put your token here
                    return headers;
                }
            };
            VolleyApplication.getInstance().addToRequestQueue(jsonOblect);

        } catch (JSONException e) {
            e.printStackTrace();
        }
        // Toast.makeText(getApplicationContext(), "done", Toast.LENGTH_LONG).show();

    }
}

How to do login using volley?

Look at my following source code

//Creating a string request
        StringRequest stringRequest = new StringRequest(Request.Method.POST, Constant.LOGIN_URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {

                        Log.d("Response",""+response);
                        //If we are getting success from server
                        if (response.equals("success")) {
                            //Creating a shared preference

                            SharedPreferences sp = LoginActivity.this.getSharedPreferences(Constant.SHARED_PREF_NAME, Context.MODE_PRIVATE);

                            //Creating editor to store values to shared preferences
                            SharedPreferences.Editor editor = sp.edit();
                            //Adding values to editor
                            editor.putString(Constant.ROLL_SHARED_PREF, roll);

                            //Saving values to editor
                            editor.apply();

                            //Starting Home activity
                            Intent intent = new Intent(LoginActivity.this, HomeActivity.class);
                            startActivity(intent);
                            Toast.makeText(LoginActivity.this, "Login Successful", Toast.LENGTH_SHORT).show();

                        }

                        else if(response.equals("failure")) {
                            //If the server response is not success
                            //Displaying an error message on toast
                            Toast.makeText(LoginActivity.this, "Roll or Password is not valid", Toast.LENGTH_LONG).show();
                        }

                        else {
                            //If the server response is not success
                            //Displaying an error message on toast
                            Toast.makeText(LoginActivity.this, "Invalid user cell or password", Toast.LENGTH_LONG).show();
                        }
                    }
                },

                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        //You can handle error here if you want

                        Toast.makeText(LoginActivity.this, "There is an error !!!", Toast.LENGTH_LONG).show();
                        loading.dismiss();
                    }
                }) {

            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> params = new HashMap<>();
                //Adding parameters to request
                params.put(Constant.KEY_ROLL, roll);
                params.put(Constant.KEY_PASSWORD, password);

                //returning parameter
                return params;
            }
        };

        //Adding the string request to the queue
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(stringRequest);
    }

I took this source code from my git repository
Maybe if you visit the following link than you will understand it more properly.

Volley login activity

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