Networking Library: Volley-Reusability

Volley is an HTTP library that makes networking for Android apps easier and most importantly, faster. It’s highly effective when building Mobile App Development Services, as it simplifies network operations in Android applications.

Volley offers the following benefits:

• Automatic scheduling of network requests.

• Multiple concurrent network connections.

• Transparent disk and memory response caching with standard HTTP cache coherence.

• Support for request prioritization.

• Cancellation request API. You can cancel a single request, or you can set blocks or scopes of requests to cancel.

• Ease of customization, for example, for retry and backoff.

• Strong ordering that makes it easy to correctly populate your UI with data fetched asynchronously from the network.

• Debugging and tracing tools.

1. Create a new project in Android Studio from File ⇒ New Project. Like this com.appcode.activity.

2. Now open the build.gradle located in project’s home directory and add volley dependency.

dependencies {compile fileTree(dir: 'libs', include: ['*.jar'])testCompile 'junit:junit:4.12'compile 'com.android.support:appcompat-v7:24.2.0'compile 'com.android.support:design:24.2.0'compile 'com.google.code.gson:gson:2.2.4'compile 'com.mcxiaoke.volley:library-aar:1.0.0'}

3 . Create a class name MainActivity.java under your project.

package com.appcode.activity;import android.content.Intent;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import com.android.volley.Request;import org.json.JSONObject;import com.appcode.R;import com.appcode.VolleyResponseListener;import com.appcode.VolleyWebService;public class MainActivity extends AppCompatActivity {private Button buttonApiCall;    @Override    protected void onCreate(Bundle savedInstanceState)     {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                buttonApiCall=(Button) findViewById(R.id.buttonApiCall);                        buttonApiCall.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {            apiCall(); //Post call method            }        });    }        public void apiCall()    {    // url = // put your base url like this "https://www.gkmit.co/front/login"    VolleyWebService.makeJsonObjectRequest(MainActivity.this, Request.Method.POST, url, jsonObject, new VolleyResponseListener()        {            @Override            public void onResponse(JSONObject response) {                           }            @Override            public void onError(String message) {                Toast.makeText(MainActivity.this, "Some Error fetching Data !!", Toast.LENGTH_SHORT).show();            }        });    }}

4. Create a interface name VolleyResponseListener.java under your project.

package com.appcode.webservices;import org.json.JSONObject;/*** Created by sikander on 21/01/17.*/public interface VolleyResponseListener {  void onError(String message);  void onResponse(JSONObject response);}

5. Create a class name VolleyWebService.java under your project.

package com.appcode.webservices;import android.app.ProgressDialog;import android.content.Context;import com.android.volley.AuthFailureError;import com.android.volley.NetworkResponse;import com.android.volley.ParseError;import com.android.volley.Response;import com.android.volley.VolleyError;import com.android.volley.toolbox.HttpHeaderParser;import com.android.volley.toolbox.JsonObjectRequest;import org.json.JSONException;import org.json.JSONObject;import java.io.UnsupportedEncodingException;import java.util.HashMap;import java.util.Map;import gkmit.grealthfresh.utils.AppController;import gkmit.grealthfresh.utils.Constants;/*** Created by sikander on 21/01/17.*/public class VolleyWebService {  public static void makeJsonObjectRequest(Context context, int method, String url, JSONObject jsonObject ,final VolleyResponseListener listener) {    final ProgressDialog progressDialog = ProgressDialog.show(context, null, "Loading...", false, false);    JsonObjectRequest jsonObjectRequest = new JsonObjectRequest        (method, url, jsonObject, new Response.Listener<JSONObject>() {          @Override          public void onResponse(JSONObject response) {            listener.onResponse(response);            progressDialog.dismiss();          }        }, new Response.ErrorListener() {          @Override          public void onErrorResponse(VolleyError error) {            listener.onError(error.toString());            progressDialog.dismiss();          }        }) {      @Override      protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {        try {          String jsonString = new String(response.data,              HttpHeaderParser.parseCharset(response.headers /**, PROTOCOL_CHARSET**/));          return Response.success(new JSONObject(jsonString),              HttpHeaderParser.parseCacheHeaders(response));        } catch (UnsupportedEncodingException e) {          return Response.error(new ParseError(e));        } catch (JSONException je) {          return Response.error(new ParseError(je));        }      }      @Override      public Map<String, String> getHeaders() throws AuthFailureError {        HashMap<String, String> headers = new HashMap<String, String>();        headers.put("Content-Type", "application/json");        return headers;      }    };    AppController.getInstance().addToRequestQueue(jsonObjectRequest, Constants.tag_json_obj);  }}

Full code here GitHub.