Networking Library: Volley-Reusability

Volley is an HTTP library that makes networking for Android apps easier and most importantly, faster.

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.