Sending POST Request to Internet Using Android Volley

Android Volley Library Tutorial

Android Volley is an library for network operations in android development. It is a very light weight framework and most importantly, very fast for network operations. It has facility to get the raw string, image or JSON data over the network efficently. One of the benifit that I like the most if you can easily use volley in your activity as it automatically sends the request in separate thread. And also maintains a queue for the requests.
Note that volley is not for large data downloads as it holds all the data in memory. For large downloading use the DownloadManager.
Here is the demo video for this app.

Dependency for android volley

Minimum requirement for android volley Android 2.2 (API Level 8) or higher. Now come towards tutorial for android volley.

Steps for using Volley

• Add the uses-permission in Android Manifest.xml file.
  

  <uses-permission android:name="android.permission.INTERNET"/>

• Add the dependency in build.gradle (Module: app)
  compile 'com.android.volley:volley:1.0.0'
• Write code for sending request in MainActivity.java
• Write the server side code. I am using xampp and sending request to localhost. Follow tutorial here to configure xampp for accessing from other devices.

You can get the complete project at Github Repository. Or you can get the code below in this post.

MainAcitivty.java

	package com.androidtechpoint.demo.androidvolley;
	import android.support.v7.app.AppCompatActivity;
	import android.os.Bundle;
	import android.support.v7.widget.AppCompatButton;
	import android.view.View;
	import android.widget.ProgressBar;
	import android.widget.TextView;
	import com.android.volley.AuthFailureError;
	import com.android.volley.Request;
	import com.android.volley.RequestQueue;
	import com.android.volley.Response;
	import com.android.volley.VolleyError;
	import com.android.volley.toolbox.StringRequest;
	import com.android.volley.toolbox.Volley;
	import java.util.HashMap;
	import java.util.Map;
	public class MainActivity extends AppCompatActivity {
	TextView _name, _email, _response;
	android.support.v7.widget.AppCompatButton _sendRequest;
	ProgressBar _proProgressBar;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	//Hooking the UI views for usage
	_name = (TextView) findViewById(R.id.name);
	_email = (TextView) findViewById(R.id.email);
	_response = (TextView) findViewById(R.id.response);
	_proProgressBar = (ProgressBar) findViewById(R.id.progressBar);
	_sendRequest = (AppCompatButton) findViewById(R.id.send_request);
	//hooking onclick listener of button
	_sendRequest.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View v) {
	// Instantiate the RequestQueue.
	RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
	//this is the url where you want to send the request
	//TODO: replace with your own url to send request, as I am using my own localhost for this tutorial
	String url = "http://192.168.1.7/AndroidVolley/androidVolley.php";
	// Request a string response from the provided URL.
	StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
	new Response.Listener<String>() {
	@Override
	public void onResponse(String response) {
	// Display the response string.
	_response.setText(response);
	}
	}, new Response.ErrorListener() {
	@Override
	public void onErrorResponse(VolleyError error) {
	_response.setText("That didn't work!");
	}
	}) {
	//adding parameters to the request
	@Override
	protected Map<String, String> getParams() throws AuthFailureError {
	Map<String, String> params = new HashMap<>();
	params.put("name", _name.getText().toString());
	params.put("email", _email.getText().toString());
	return params;
	}
	};
	// Add the request to the RequestQueue.
	queue.add(stringRequest);
	}
	});
	}
	}

view raw MainActivity.java hosted with ❤ by GitHub

activity_main.xml

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	android:id="@+id/activity_main"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical"
	android:paddingBottom="@dimen/activity_vertical_margin"
	android:paddingLeft="@dimen/activity_horizontal_margin"
	android:paddingRight="@dimen/activity_horizontal_margin"
	android:paddingTop="@dimen/activity_vertical_margin"
	tools:context="com.androidtechpoint.demo.androidvolley.MainActivity">
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="Name" />
	<EditText
	android:id="@+id/name"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Your Name" />
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="Email" />
	<EditText
	android:id="@+id/email"
	android:inputType="textEmailAddress"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Your Email" />
	<android.support.v7.widget.AppCompatButton
	android:id="@+id/send_request"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="Send Request" />
	<TextView
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="Response From Server"
	android:textSize="16sp"
	android:textStyle="bold" />
	<TextView
	android:id="@+id/response"
	android:layout_width="match_parent"
	android:layout_height="wrap_content" />
	<ProgressBar
	android:id="@+id/progressBar"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_gravity="center"
	android:visibility="invisible" />
	</LinearLayout>

view raw activity_main.xml hosted with ❤ by GitHub

androidvolley.php

	<?php
	$name = trim($_POST['name']);
	$email = trim($_POST['email']);
	echo "Hello $name! Welcome to android Tech Point.\nYour email is $email";
	?>

view raw androidvolley.php hosted with ❤ by GitHub

In case of error

If you get some error, the first thing you should check is permissions in android androidManifest.xml and build.gradle. If you still get the error feel free to comment below or contact me at farooqahmadkhan003@gmail.com.