We are going see how to make a very simple Android app (in our case, a product inventory app) that will call a PHP script to perform basic CRUD(Create, Read, Update, Delete) operations. To brief you on the architecture, this is how it works. First your android app calls a PHP script in order to perform a data operation, lets say “create”. The PHP script then connects to your MySQL database to perform the operation.
So the data flows from your Android app to PHP script then finally is stored in your MySQL database. Allright, lets dig deeper.

Download Code

Please note that the purpose of the code that I have provided here is to, ease you (beginner level) into connecting an Android app with PHP, MYSQL. You should not take this as a standard or secure coding practice. In production environment, you ideally need to avoid any code that will potentially inject vulnerabilities (like MYSQL Injection). MySQL injection itself is a huge topic and cannot be covered in this single post and that is not the agenda of this post either.

1. What is WAMP Server

WAMP is acronym for Windows, Apache, MySQL and PHP, Perl, Python. WAMP software is one click installer which creates an environment for developing PHP, MySQL web application. By installing this software you will be installing Apache, MySQL and PHP. Alternatively you can use XAMP Server also.

wamp server installation

2. Installing and Running WAMP Server

Download & Install WAMP server from www.wampserver.com/en/. Once you have installed wamp server, launch the program from Start -> All Programs -> WampServer -> StartWampServer.

You can test your server by opening the address http://localhost/ in your browser.
Also you can check phpmyadmin by opening http://localhost/phpmyadmin

Following is a screen cast of Downloading and Installing WAMP Server.

3. Creating and Running PHP Project

Now you have the environment ready to develop a PHP & MySQL project. Go to the location where you installed WAMP server (In my case i installed in C:\wamp\) and go to www folder and create a new folder for your project. You have to place all your project files inside this folder.

Create a folder called android_connect and create a new php file called test.php and try out simple php code. After placing following code try to open http://localhost/android_connect/test.php and you should see a message called “Welcome, I am connecting Android to PHP, MySQL“.

test.php

<?php
    echo "Welcome, I am connecting Android to PHP, MySQL";
?>

Following is a screen cast of Creating and Running a simple PHP project.

4. Creating MySQL Database and Tables

In this tutorial i am creating a simple database with one table. Through out this tutorial i am using same table to perform example operations. Now open phpmyadmin by opening the address http://localhost/phpmyadmin/ in your browser. You can use the PhpMyAdmin tool to create a database and a table.

I am creating a database named androidhive and a table called products.

CREATE DATABASE androidhive;
CREATE TABLE products(
pid int(11) primary key auto_increment,
name varchar(100) not null,
price decimal(10,2) not null,
description text,
created_at timestamp default now(),
updated_at timestamp
);

Following is a screen cast of Creating database and tables in phpmyadmin

5. Connecting to MySQL database using PHP

Now the actual server side coding starts. Create a PHP class to connect to MySQL database. The main purpose of this class is to open a connection to database and close the connection whenever its not needed. So create two files called db_config.php and db_connect.php

db_config.php – will have database connection variables
db_connect.php – a class file to connect to database

Following is code for two php files

db_config.php

<?php

/*
 * All database connection variables
 */

define('DB_USER', "root"); // db user
define('DB_PASSWORD', ""); // db password (mention your db password here)
define('DB_DATABASE', "androidhive"); // database name
define('DB_SERVER', "localhost"); // db server
?>

db_connect.php

<?php

/**
 * A class file to connect to database
 */
class DB_CONNECT {

    // constructor
    function __construct() {
        // connecting to database
        $this->connect();
    }

    // destructor
    function __destruct() {
        // closing db connection
        $this->close();
    }

    /**
     * Function to connect with database
     */
    function connect() {
        // import database connection variables
        require_once __DIR__ . '/db_config.php';

        // Connecting to mysql database
        $con = mysql_connect(DB_SERVER, DB_USER, DB_PASSWORD) or die(mysql_error());

        // Selecing database
        $db = mysql_select_db(DB_DATABASE) or die(mysql_error()) or die(mysql_error());

        // returing connection cursor
        return $con;
    }

    /**
     * Function to close db connection
     */
    function close() {
        // closing db connection
        mysql_close();
    }

}

?>

Usage: When ever you want to connect to MySQL database and do some operations use the db_connect.php class like this

$db = new DB_CONNECT(); // creating class object(will open database connection)

6. Basic MySQL CRUD Operations using PHP

In this tutorial i am covering basic CRUD (Create, Read, Update, Delete) operations on MySQL database using PHP.

If you are a novice in PHP and MySQL, I suggest you go through PHP, SQL and A Beginner’s Guide to SQL to get the basic knowledge.

6.a) Creating a row in MySQL (Creating a new product row)

In your PHP project create a new php file called create_product.php and place the following code. This file is mainly for creating a new product in products table.

In the following code i am reading product data via POST and storing them in products table. At the end i am echoing appropriate JSON as response.

<?php

/*
 * Following code will create a new product row
 * All product details are read from HTTP Post Request
 */

// array for JSON response
$response = array();

// check for required fields
if (isset($_POST['name']) && isset($_POST['price']) && isset($_POST['description'])) {

    $name = $_POST['name'];
    $price = $_POST['price'];
    $description = $_POST['description'];

    // include db connect class
    require_once __DIR__ . '/db_connect.php';

    // connecting to db
    $db = new DB_CONNECT();

    // mysql inserting a new row
    $result = mysql_query("INSERT INTO products(name, price, description) VALUES('$name', '$price', '$description')");

    // check if row inserted or not
    if ($result) {
        // successfully inserted into database
        $response["success"] = 1;
        $response["message"] = "Product successfully created.";

        // echoing JSON response
        echo json_encode($response);
    } else {
        // failed to insert row
        $response["success"] = 0;
        $response["message"] = "Oops! An error occurred.";

        // echoing JSON response
        echo json_encode($response);
    }
} else {
    // required field is missing
    $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";

    // echoing JSON response
    echo json_encode($response);
}
?>

For the above code JSON response will be like

When POST param(s) is missing

{
    "success": 0,
    "message": "Required field(s) is missing"
}

When product is successfully created

{
    "success": 1,
    "message": "Product successfully created."
}

When error occurred while inserting data

{
    "success": 0,
    "message": "Oops! An error occurred."
}

6.b) Reading a Row from MySQL (Reading product details)

Create a new php file called get_product_details.php and write the following code. This file will get single product details by taking product id (pid) as post parameter.

<?php

/*
 * Following code will get single product details
 * A product is identified by product id (pid)
 */

// array for JSON response
$response = array();

// include db connect class
require_once __DIR__ . '/db_connect.php';

// connecting to db
$db = new DB_CONNECT();

// check for post data
if (isset($_GET["pid"])) {
    $pid = $_GET['pid'];

    // get a product from products table
    $result = mysql_query("SELECT *FROM products WHERE pid = $pid");

    if (!empty($result)) {
        // check for empty result
        if (mysql_num_rows($result) > 0) {

            $result = mysql_fetch_array($result);

            $product = array();
            $product["pid"] = $result["pid"];
            $product["name"] = $result["name"];
            $product["price"] = $result["price"];
            $product["description"] = $result["description"];
            $product["created_at"] = $result["created_at"];
            $product["updated_at"] = $result["updated_at"];
            // success
            $response["success"] = 1;

            // user node
            $response["product"] = array();

            array_push($response["product"], $product);

            // echoing JSON response
            echo json_encode($response);
        } else {
            // no product found
            $response["success"] = 0;
            $response["message"] = "No product found";

            // echo no users JSON
            echo json_encode($response);
        }
    } else {
        // no product found
        $response["success"] = 0;
        $response["message"] = "No product found";

        // echo no users JSON
        echo json_encode($response);
    }
} else {
    // required field is missing
    $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";

    // echoing JSON response
    echo json_encode($response);
}
?>

The json response for the above file will be

When successfully getting product details

{
    "success": 1,
    "product": [
        {
            "pid": "1",
            "name": "iPHone 4S",
            "price": "300.00",
            "description": "iPhone 4S white",
            "created_at": "2012-04-29 01:41:42",
            "updated_at": "0000-00-00 00:00:00"
        }
    ]
}

When no product found with matched pid

{
    "success": 0,
    "message": "No product found"
}

6.c) Reading All Rows from MySQL (Reading all products)

We need a json to list all the products on android device. So create a new php file named get_all_products.php and write following code.

<?php

/*
 * Following code will list all the products
 */

// array for JSON response
$response = array();

// include db connect class
require_once __DIR__ . '/db_connect.php';

// connecting to db
$db = new DB_CONNECT();

// get all products from products table
$result = mysql_query("SELECT *FROM products") or die(mysql_error());

// check for empty result
if (mysql_num_rows($result) > 0) {
    // looping through all results
    // products node
    $response["products"] = array();

    while ($row = mysql_fetch_array($result)) {
        // temp user array
        $product = array();
        $product["pid"] = $row["pid"];
        $product["name"] = $row["name"];
        $product["price"] = $row["price"];
        $product["created_at"] = $row["created_at"];
        $product["updated_at"] = $row["updated_at"];

        // push single product into final response array
        array_push($response["products"], $product);
    }
    // success
    $response["success"] = 1;

    // echoing JSON response
    echo json_encode($response);
} else {
    // no products found
    $response["success"] = 0;
    $response["message"] = "No products found";

    // echo no users JSON
    echo json_encode($response);
}
?>

And the JSON response for above code

Listing all Products

{
    "products": [
        {
            "pid": "1",
            "name": "iPhone 4S",
            "price": "300.00",
            "created_at": "2012-04-29 02:04:02",
            "updated_at": "0000-00-00 00:00:00"
        },
        {
            "pid": "2",
            "name": "Macbook Pro",
            "price": "600.00",
            "created_at": "2012-04-29 02:04:51",
            "updated_at": "0000-00-00 00:00:00"
        },
        {
            "pid": "3",
            "name": "Macbook Air",
            "price": "800.00",
            "created_at": "2012-04-29 02:05:57",
            "updated_at": "0000-00-00 00:00:00"
        },
        {
            "pid": "4",
            "name": "OS X Lion",
            "price": "100.00",
            "created_at": "2012-04-29 02:07:14",
            "updated_at": "0000-00-00 00:00:00"
        }
    ],
    "success": 1
}

When products not found

{
    "success": 0,
    "message": "No products found"
}

6.d) Updating a Row in MySQL (Updating product details)

Create a php file named update_product.php to update product details. Each product is identified by pid.

<?php

/*
 * Following code will update a product information
 * A product is identified by product id (pid)
 */

// array for JSON response
$response = array();

// check for required fields
if (isset($_POST['pid']) && isset($_POST['name']) && isset($_POST['price']) && isset($_POST['description'])) {

    $pid = $_POST['pid'];
    $name = $_POST['name'];
    $price = $_POST['price'];
    $description = $_POST['description'];

    // include db connect class
    require_once __DIR__ . '/db_connect.php';

    // connecting to db
    $db = new DB_CONNECT();

    // mysql update row with matched pid
    $result = mysql_query("UPDATE products SET name = '$name', price = '$price', description = '$description' WHERE pid = $pid");

    // check if row inserted or not
    if ($result) {
        // successfully updated
        $response["success"] = 1;
        $response["message"] = "Product successfully updated.";

        // echoing JSON response
        echo json_encode($response);
    } else {

    }
} else {
    // required field is missing
    $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";

    // echoing JSON response
    echo json_encode($response);
}
?>

The json reponse of above code, when product is updated successfully

{
    "success": 1,
    "message": "Product successfully updated."
}

6.e) Deleting a Row in MySQL (Deleting a product)

The last operation is deletion on database. Create a new php file called delete_product.php and paste the following code. The main functionality of this file is to delete a product from database.

<?php

/*
 * Following code will delete a product from table
 * A product is identified by product id (pid)
 */

// array for JSON response
$response = array();

// check for required fields
if (isset($_POST['pid'])) {
    $pid = $_POST['pid'];

    // include db connect class
    require_once __DIR__ . '/db_connect.php';

    // connecting to db
    $db = new DB_CONNECT();

    // mysql update row with matched pid
    $result = mysql_query("DELETE FROM products WHERE pid = $pid");

    // check if row deleted or not
    if (mysql_affected_rows() > 0) {
        // successfully updated
        $response["success"] = 1;
        $response["message"] = "Product successfully deleted";

        // echoing JSON response
        echo json_encode($response);
    } else {
        // no product found
        $response["success"] = 0;
        $response["message"] = "No product found";

        // echo no users JSON
        echo json_encode($response);
    }
} else {
    // required field is missing
    $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";

    // echoing JSON response
    echo json_encode($response);
}
?>

When product successfully deleted

{
    "success": 1,
    "message": "Product successfully deleted"
}

When product not found

{
    "success": 0,
    "message": "No product found"
}

Until now, we built a simple api for our products table. We are now done with the server side coding (PHP) and its time to take a break and start our actual android application coding.

7. Creating Android Application

Create a new project in your Eclipse IDE by filling the required details.

1. Create new project in Eclipse IDE by going to File ⇒ New ⇒ Android Project and name the Activity class name as MainScreenActivity.

2. Open your AndroidManifest.xml file and add following code. First i am adding all the classes i am creating to manifest file. Also i am adding INTERNET Connect permission.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidhive"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:configChanges="keyboardHidden|orientation"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >

        <activity
            android:name=".MainScreenActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <!-- All Product Activity -->
        <activity
            android:name=".AllProductsActivity"
            android:label="All Products" >
        </activity>

        <!-- Add Product Activity -->
        <activity
            android:name=".NewProductActivity"
            android:label="Add New Product" >
        </activity>

        <!-- Edit Product Activity -->
        <activity
            android:name=".EditProductActivity"
            android:label="Edit Product" >
        </activity>
    </application>

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

</manifest>

3. Now create a new xml file under res ⇒ layout folder and name it as main_screen.xml This layout file contains two simple buttons to view all products and add a new product.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:gravity="center_horizontal">

    <!--  Sample Dashboard screen with Two buttons -->
    <!--  Button to view all products screen -->
    <Button android:id="@+id/btnViewProducts"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="View Products"
        android:layout_marginTop="25dip"/>

    <!--  Button to create a new product screen -->
    <Button android:id="@+id/btnCreateProduct"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Add New Products"
        android:layout_marginTop="25dip"/>

</LinearLayout>
main screen

4. Open you main activity class which is MainScreenActivity.java and write click events for two button which are mentioned in main_screen.xml layout.

package com.example.androidhive;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainScreenActivity extends Activity{

	Button btnViewProducts;
	Button btnNewProduct;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main_screen);

		// Buttons
		btnViewProducts = (Button) findViewById(R.id.btnViewProducts);
		btnNewProduct = (Button) findViewById(R.id.btnCreateProduct);

		// view products click event
		btnViewProducts.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View view) {
				// Launching All products Activity
				Intent i = new Intent(getApplicationContext(), AllProductsActivity.class);
				startActivity(i);

			}
		});

		// view products click event
		btnNewProduct.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View view) {
				// Launching create new product activity
				Intent i = new Intent(getApplicationContext(), NewProductActivity.class);
				startActivity(i);

			}
		});
	}
}

Displaying All Products in ListView (Read)

5. Now we need an Activity display all the products in list view format. As we know list view needs two xml files, one for listview and other is for single list row. Create two xml files under res ⇒ layout folder and name it as all_products.xml and list_item.xml

all_products.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
	<!-- Main ListView
		 Always give id value as list(@android:id/list)
	-->
    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <!-- Product id (pid) - will be HIDDEN - used to pass to other activity -->
    <TextView
        android:id="@+id/pid"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:visibility="gone" />

    <!-- Name Label -->
    <TextView
        android:id="@+id/name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingTop="6dip"
        android:paddingLeft="6dip"
        android:textSize="17dip"
        android:textStyle="bold" />

</LinearLayout>

6. Create a new class file and name it as AllProductsActivity.java. In the following code

-> First a request is send to get_all_products.php file using a Background Async task thread.
-> After getting JSON from get_all_products.php, i parsed it and displayed in a listview.
-> If there are no products found AddNewProductAcivity is launched.

package com.example.androidhive;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

public class AllProductsActivity extends ListActivity {

	// Progress Dialog
	private ProgressDialog pDialog;

	// Creating JSON Parser object
	JSONParser jParser = new JSONParser();

	ArrayList<HashMap<String, String>> productsList;

	// url to get all products list
	private static String url_all_products = "https://api.androidhive.info/android_connect/get_all_products.php";

	// JSON Node names
	private static final String TAG_SUCCESS = "success";
	private static final String TAG_PRODUCTS = "products";
	private static final String TAG_PID = "pid";
	private static final String TAG_NAME = "name";

	// products JSONArray
	JSONArray products = null;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.all_products);

		// Hashmap for ListView
		productsList = new ArrayList<HashMap<String, String>>();

		// Loading products in Background Thread
		new LoadAllProducts().execute();

		// Get listview
		ListView lv = getListView();

		// on seleting single product
		// launching Edit Product Screen
		lv.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// getting values from selected ListItem
				String pid = ((TextView) view.findViewById(R.id.pid)).getText()
						.toString();

				// Starting new intent
				Intent in = new Intent(getApplicationContext(),
						EditProductActivity.class);
				// sending pid to next activity
				in.putExtra(TAG_PID, pid);

				// starting new activity and expecting some response back
				startActivityForResult(in, 100);
			}
		});

	}

	// Response from Edit Product Activity
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		// if result code 100
		if (resultCode == 100) {
			// if result code 100 is received
			// means user edited/deleted product
			// reload this screen again
			Intent intent = getIntent();
			finish();
			startActivity(intent);
		}

	}

	/**
	 * Background Async Task to Load all product by making HTTP Request
	 * */
	class LoadAllProducts extends AsyncTask<String, String, String> {

		/**
		 * Before starting background thread Show Progress Dialog
		 * */
		@Override
		protected void onPreExecute() {
			super.onPreExecute();
			pDialog = new ProgressDialog(AllProductsActivity.this);
			pDialog.setMessage("Loading products. Please wait...");
			pDialog.setIndeterminate(false);
			pDialog.setCancelable(false);
			pDialog.show();
		}

		/**
		 * getting All products from url
		 * */
		protected String doInBackground(String... args) {
			// Building Parameters
			List<NameValuePair> params = new ArrayList<NameValuePair>();
			// getting JSON string from URL
			JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);

			// Check your log cat for JSON reponse
			Log.d("All Products: ", json.toString());

			try {
				// Checking for SUCCESS TAG
				int success = json.getInt(TAG_SUCCESS);

				if (success == 1) {
					// products found
					// Getting Array of Products
					products = json.getJSONArray(TAG_PRODUCTS);

					// looping through All Products
					for (int i = 0; i < products.length(); i++) {
						JSONObject c = products.getJSONObject(i);

						// Storing each json item in variable
						String id = c.getString(TAG_PID);
						String name = c.getString(TAG_NAME);

						// creating new HashMap
						HashMap<String, String> map = new HashMap<String, String>();

						// adding each child node to HashMap key => value
						map.put(TAG_PID, id);
						map.put(TAG_NAME, name);

						// adding HashList to ArrayList
						productsList.add(map);
					}
				} else {
					// no products found
					// Launch Add New product Activity
					Intent i = new Intent(getApplicationContext(),
							NewProductActivity.class);
					// Closing all previous activities
					i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
					startActivity(i);
				}
			} catch (JSONException e) {
				e.printStackTrace();
			}

			return null;
		}

		/**
		 * After completing background task Dismiss the progress dialog
		 * **/
		protected void onPostExecute(String file_url) {
			// dismiss the dialog after getting all products
			pDialog.dismiss();
			// updating UI from Background Thread
			runOnUiThread(new Runnable() {
				public void run() {
					/**
					 * Updating parsed JSON data into ListView
					 * */
					ListAdapter adapter = new SimpleAdapter(
							AllProductsActivity.this, productsList,
							R.layout.list_item, new String[] { TAG_PID,
									TAG_NAME},
							new int[] { R.id.pid, R.id.name });
					// updating listview
					setListAdapter(adapter);
				}
			});

		}

	}
}
android list products

Adding a New Product (Write)

7. Create a new view and acivity to add a new product into mysql database. Create a simple form which contains EditText for product name, price and description.

Create a new xml file and name it as add_product.xml and paste the following code to create a simple form.

add_product.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <!-- Name Label -->
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Product Name"
        android:paddingLeft="10dip"
        android:paddingRight="10dip"
        android:paddingTop="10dip"
        android:textSize="17dip"/>

    <!-- Input Name -->
	<EditText android:id="@+id/inputName"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_margin="5dip"
	    android:layout_marginBottom="15dip"
	    android:singleLine="true"/>

	<!-- Price Label -->
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Price"
        android:paddingLeft="10dip"
        android:paddingRight="10dip"
        android:paddingTop="10dip"
        android:textSize="17dip"/>

    <!-- Input Price -->
	<EditText android:id="@+id/inputPrice"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_margin="5dip"
	    android:layout_marginBottom="15dip"
	    android:singleLine="true"
	    android:inputType="numberDecimal"/>

	<!-- Description Label -->
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Description"
        android:paddingLeft="10dip"
        android:paddingRight="10dip"
        android:paddingTop="10dip"
        android:textSize="17dip"/>

    <!-- Input description -->
	<EditText android:id="@+id/inputDesc"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_margin="5dip"
	    android:layout_marginBottom="15dip"
	    android:lines="4"
	    android:gravity="top"/>

	<!-- Button Create Product -->
	<Button android:id="@+id/btnCreateProduct"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:text="Create Product"/>

</LinearLayout>
android adding new product

8. Now create new Activity to insert a new product into mysql database. Create a class file and name it as NewProductActivity.java and type the following code. In the following code

-> First new product data is read from the EditText form and formatted into a basic params.
-> A request is made to create_product.php to create a new product through HTTP post.
-> After getting json response from create_product.php, If success bit is 1 then list view is refreshed with newly added product.

package com.example.androidhive;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class NewProductActivity extends Activity {

	// Progress Dialog
	private ProgressDialog pDialog;

	JSONParser jsonParser = new JSONParser();
	EditText inputName;
	EditText inputPrice;
	EditText inputDesc;

	// url to create new product
	private static String url_create_product = "https://api.androidhive.info/android_connect/create_product.php";

	// JSON Node names
	private static final String TAG_SUCCESS = "success";

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.add_product);

		// Edit Text
		inputName = (EditText) findViewById(R.id.inputName);
		inputPrice = (EditText) findViewById(R.id.inputPrice);
		inputDesc = (EditText) findViewById(R.id.inputDesc);

		// Create button
		Button btnCreateProduct = (Button) findViewById(R.id.btnCreateProduct);

		// button click event
		btnCreateProduct.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View view) {
				// creating new product in background thread
				new CreateNewProduct().execute();
			}
		});
	}

	/**
	 * Background Async Task to Create new product
	 * */
	class CreateNewProduct extends AsyncTask<String, String, String> {

		/**
		 * Before starting background thread Show Progress Dialog
		 * */
		@Override
		protected void onPreExecute() {
			super.onPreExecute();
			pDialog = new ProgressDialog(NewProductActivity.this);
			pDialog.setMessage("Creating Product..");
			pDialog.setIndeterminate(false);
			pDialog.setCancelable(true);
			pDialog.show();
		}

		/**
		 * Creating product
		 * */
		protected String doInBackground(String... args) {
			String name = inputName.getText().toString();
			String price = inputPrice.getText().toString();
			String description = inputDesc.getText().toString();

			// Building Parameters
			List<NameValuePair> params = new ArrayList<NameValuePair>();
			params.add(new BasicNameValuePair("name", name));
			params.add(new BasicNameValuePair("price", price));
			params.add(new BasicNameValuePair("description", description));

			// getting JSON Object
			// Note that create product url accepts POST method
			JSONObject json = jsonParser.makeHttpRequest(url_create_product,
					"POST", params);

			// check log cat fro response
			Log.d("Create Response", json.toString());

			// check for success tag
			try {
				int success = json.getInt(TAG_SUCCESS);

				if (success == 1) {
					// successfully created product
					Intent i = new Intent(getApplicationContext(), AllProductsActivity.class);
					startActivity(i);

					// closing this screen
					finish();
				} else {
					// failed to create product
				}
			} catch (JSONException e) {
				e.printStackTrace();
			}

			return null;
		}

		/**
		 * After completing background task Dismiss the progress dialog
		 * **/
		protected void onPostExecute(String file_url) {
			// dismiss the dialog once done
			pDialog.dismiss();
		}

	}
}

Reading, Updating and Deleting a Single Product

9. If you notice the AllProductsActivity.java, In listview i am launching EditProductAcivity.java once a single list item is selected. So create xml file called edit_product.xml and create a form which is same as create_product.xml.

edit_product.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <!-- Name Label -->
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Product Name"
        android:paddingLeft="10dip"
        android:paddingRight="10dip"
        android:paddingTop="10dip"
        android:textSize="17dip"/>

    <!-- Input Name -->
	<EditText android:id="@+id/inputName"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_margin="5dip"
	    android:layout_marginBottom="15dip"
	    android:singleLine="true"/>

	<!-- Price Label -->
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Price"
        android:paddingLeft="10dip"
        android:paddingRight="10dip"
        android:paddingTop="10dip"
        android:textSize="17dip"/>

    <!-- Input Price -->
	<EditText android:id="@+id/inputPrice"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_margin="5dip"
	    android:layout_marginBottom="15dip"
	    android:singleLine="true"
	    android:inputType="numberDecimal"/>

	<!-- Description Label -->
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Description"
        android:paddingLeft="10dip"
        android:paddingRight="10dip"
        android:paddingTop="10dip"
        android:textSize="17dip"/>

    <!-- Input description -->
	<EditText android:id="@+id/inputDesc"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_margin="5dip"
	    android:layout_marginBottom="15dip"
	    android:lines="4"
	    android:gravity="top"/>

	<LinearLayout android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:orientation="horizontal">
	    <!-- Button Create Product -->
	<Button android:id="@+id/btnSave"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:text="Save Changes"
	    android:layout_weight="1"/>

	<!-- Button Create Product -->
	<Button android:id="@+id/btnDelete"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:text="Delete"
	    android:layout_weight="1"/>
	</LinearLayout>

</LinearLayout>

10. Create a class file for edit_product.xml and name it as EditProductActivity.java and fill it with following code. In the following code

-> First product id (pid) is read from the intent which is sent from listview.
-> A request is made to get_product_details.php and after getting product details in json format, I parsed the json and displayed in EditText.
-> After displaying product data in the form if user clicks on Save Changes Button, another HTTP request is made to update_product.php to store updated product data.
-> If the user selected Delete Product Button, HTTP request is made to delete_product.php and product is deleted from mysql database, and listview is refreshed with new product list.

package com.example.androidhive;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class EditProductActivity extends Activity {

	EditText txtName;
	EditText txtPrice;
	EditText txtDesc;
	EditText txtCreatedAt;
	Button btnSave;
	Button btnDelete;

	String pid;

	// Progress Dialog
	private ProgressDialog pDialog;

	// JSON parser class
	JSONParser jsonParser = new JSONParser();

	// single product url
	private static final String url_product_detials = "https://api.androidhive.info/android_connect/get_product_details.php";

	// url to update product
	private static final String url_update_product = "https://api.androidhive.info/android_connect/update_product.php";

	// url to delete product
	private static final String url_delete_product = "https://api.androidhive.info/android_connect/delete_product.php";

	// JSON Node names
	private static final String TAG_SUCCESS = "success";
	private static final String TAG_PRODUCT = "product";
	private static final String TAG_PID = "pid";
	private static final String TAG_NAME = "name";
	private static final String TAG_PRICE = "price";
	private static final String TAG_DESCRIPTION = "description";

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.edit_product);

		// save button
		btnSave = (Button) findViewById(R.id.btnSave);
		btnDelete = (Button) findViewById(R.id.btnDelete);

		// getting product details from intent
		Intent i = getIntent();

		// getting product id (pid) from intent
		pid = i.getStringExtra(TAG_PID);

		// Getting complete product details in background thread
		new GetProductDetails().execute();

		// save button click event
		btnSave.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View arg0) {
				// starting background task to update product
				new SaveProductDetails().execute();
			}
		});

		// Delete button click event
		btnDelete.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View arg0) {
				// deleting product in background thread
				new DeleteProduct().execute();
			}
		});

	}

	/**
	 * Background Async Task to Get complete product details
	 * */
	class GetProductDetails extends AsyncTask<String, String, String> {

		/**
		 * Before starting background thread Show Progress Dialog
		 * */
		@Override
		protected void onPreExecute() {
			super.onPreExecute();
			pDialog = new ProgressDialog(EditProductActivity.this);
			pDialog.setMessage("Loading product details. Please wait...");
			pDialog.setIndeterminate(false);
			pDialog.setCancelable(true);
			pDialog.show();
		}

		/**
		 * Getting product details in background thread
		 * */
		protected String doInBackground(String... params) {

			// updating UI from Background Thread
			runOnUiThread(new Runnable() {
				public void run() {
					// Check for success tag
					int success;
					try {
						// Building Parameters
						List<NameValuePair> params = new ArrayList<NameValuePair>();
						params.add(new BasicNameValuePair("pid", pid));

						// getting product details by making HTTP request
						// Note that product details url will use GET request
						JSONObject json = jsonParser.makeHttpRequest(
								url_product_detials, "GET", params);

						// check your log for json response
						Log.d("Single Product Details", json.toString());

						// json success tag
						success = json.getInt(TAG_SUCCESS);
						if (success == 1) {
							// successfully received product details
							JSONArray productObj = json
									.getJSONArray(TAG_PRODUCT); // JSON Array

							// get first product object from JSON Array
							JSONObject product = productObj.getJSONObject(0);

							// product with this pid found
							// Edit Text
							txtName = (EditText) findViewById(R.id.inputName);
							txtPrice = (EditText) findViewById(R.id.inputPrice);
							txtDesc = (EditText) findViewById(R.id.inputDesc);

							// display product data in EditText
							txtName.setText(product.getString(TAG_NAME));
							txtPrice.setText(product.getString(TAG_PRICE));
							txtDesc.setText(product.getString(TAG_DESCRIPTION));

						}else{
							// product with pid not found
						}
					} catch (JSONException e) {
						e.printStackTrace();
					}
				}
			});

			return null;
		}

		/**
		 * After completing background task Dismiss the progress dialog
		 * **/
		protected void onPostExecute(String file_url) {
			// dismiss the dialog once got all details
			pDialog.dismiss();
		}
	}

	/**
	 * Background Async Task to  Save product Details
	 * */
	class SaveProductDetails extends AsyncTask<String, String, String> {

		/**
		 * Before starting background thread Show Progress Dialog
		 * */
		@Override
		protected void onPreExecute() {
			super.onPreExecute();
			pDialog = new ProgressDialog(EditProductActivity.this);
			pDialog.setMessage("Saving product ...");
			pDialog.setIndeterminate(false);
			pDialog.setCancelable(true);
			pDialog.show();
		}

		/**
		 * Saving product
		 * */
		protected String doInBackground(String... args) {

			// getting updated data from EditTexts
			String name = txtName.getText().toString();
			String price = txtPrice.getText().toString();
			String description = txtDesc.getText().toString();

			// Building Parameters
			List<NameValuePair> params = new ArrayList<NameValuePair>();
			params.add(new BasicNameValuePair(TAG_PID, pid));
			params.add(new BasicNameValuePair(TAG_NAME, name));
			params.add(new BasicNameValuePair(TAG_PRICE, price));
			params.add(new BasicNameValuePair(TAG_DESCRIPTION, description));

			// sending modified data through http request
			// Notice that update product url accepts POST method
			JSONObject json = jsonParser.makeHttpRequest(url_update_product,
					"POST", params);

			// check json success tag
			try {
				int success = json.getInt(TAG_SUCCESS);

				if (success == 1) {
					// successfully updated
					Intent i = getIntent();
					// send result code 100 to notify about product update
					setResult(100, i);
					finish();
				} else {
					// failed to update product
				}
			} catch (JSONException e) {
				e.printStackTrace();
			}

			return null;
		}

		/**
		 * After completing background task Dismiss the progress dialog
		 * **/
		protected void onPostExecute(String file_url) {
			// dismiss the dialog once product uupdated
			pDialog.dismiss();
		}
	}

	/*****************************************************************
	 * Background Async Task to Delete Product
	 * */
	class DeleteProduct extends AsyncTask<String, String, String> {

		/**
		 * Before starting background thread Show Progress Dialog
		 * */
		@Override
		protected void onPreExecute() {
			super.onPreExecute();
			pDialog = new ProgressDialog(EditProductActivity.this);
			pDialog.setMessage("Deleting Product...");
			pDialog.setIndeterminate(false);
			pDialog.setCancelable(true);
			pDialog.show();
		}

		/**
		 * Deleting product
		 * */
		protected String doInBackground(String... args) {

			// Check for success tag
			int success;
			try {
				// Building Parameters
				List<NameValuePair> params = new ArrayList<NameValuePair>();
				params.add(new BasicNameValuePair("pid", pid));

				// getting product details by making HTTP request
				JSONObject json = jsonParser.makeHttpRequest(
						url_delete_product, "POST", params);

				// check your log for json response
				Log.d("Delete Product", json.toString());

				// json success tag
				success = json.getInt(TAG_SUCCESS);
				if (success == 1) {
					// product successfully deleted
					// notify previous activity by sending code 100
					Intent i = getIntent();
					// send result code 100 to notify about product deletion
					setResult(100, i);
					finish();
				}
			} catch (JSONException e) {
				e.printStackTrace();
			}

			return null;
		}

		/**
		 * After completing background task Dismiss the progress dialog
		 * **/
		protected void onPostExecute(String file_url) {
			// dismiss the dialog once product deleted
			pDialog.dismiss();

		}

	}
}
android edit product
android delete product

JSON Parser Class

I used a JSON Parser class to get JSON from URL. This class supports two http request methods GET and POST to get json from url.

package com.example.androidhive;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONParser {

	static InputStream is = null;
	static JSONObject jObj = null;
	static String json = "";

	// constructor
	public JSONParser() {

	}

	// function get json from url
	// by making HTTP POST or GET mehtod
	public JSONObject makeHttpRequest(String url, String method,
			List<NameValuePair> params) {

		// Making HTTP request
		try {

			// check for request method
			if(method == "POST"){
				// request method is POST
				// defaultHttpClient
				DefaultHttpClient httpClient = new DefaultHttpClient();
				HttpPost httpPost = new HttpPost(url);
				httpPost.setEntity(new UrlEncodedFormEntity(params));

				HttpResponse httpResponse = httpClient.execute(httpPost);
				HttpEntity httpEntity = httpResponse.getEntity();
				is = httpEntity.getContent();

			}else if(method == "GET"){
				// request method is GET
				DefaultHttpClient httpClient = new DefaultHttpClient();
				String paramString = URLEncodedUtils.format(params, "utf-8");
				url += "?" + paramString;
				HttpGet httpGet = new HttpGet(url);

				HttpResponse httpResponse = httpClient.execute(httpGet);
				HttpEntity httpEntity = httpResponse.getEntity();
				is = httpEntity.getContent();
			}			

		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(
					is, "iso-8859-1"), 8);
			StringBuilder sb = new StringBuilder();
			String line = null;
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}
			is.close();
			json = sb.toString();
		} catch (Exception e) {
			Log.e("Buffer Error", "Error converting result " + e.toString());
		}

		// try parse the string to a JSON object
		try {
			jObj = new JSONObject(json);
		} catch (JSONException e) {
			Log.e("JSON Parser", "Error parsing data " + e.toString());
		}

		// return JSON String
		return jObj;

	}
}

Run your project and test the application. You might get lot of errors. Always use Log Cat to debug your application, and if you couldn’t solve your errors please do comment here.

This image is for thumbnail purpose
android connecting to mysql php
Ravi is hardcore Android programmer and Android programming has been his passion since he compiled his first hello-world program. Solving real problems of Android developers through tutorials has always been interesting part for him.
  • Ann

    How did you get the URL? and does your codes are available to android version 4.4 above?

    • pawan kumar

      yourservername/databasename/filename.php

  • Abhinav Varshney

    everything is working fine but not able to fetch records in android

  • Amina chermiti

    when i test the php file this message is shown “”Oops! An error occurred.” .. i can’t insert any row,, how i fix that ??

    • Check Log Cat or apache log cat for php errors

      • Sicnarf Omsare

        Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject

      • Sicnarf Omsare

        07-30 01:03:49.048: E/JSON Parser(12422): Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
        07-30 01:03:49.048: E/JSON Parser(12422): Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
        07-30 01:03:49.048: W/dalvikvm(12422): threadid=12: thread exiting with uncaught exception (group=0x41707bc0)
        07-30 01:03:49.048: E/AndroidRuntime(12422): FATAL EXCEPTION: AsyncTask #1
        07-30 01:03:49.048: E/AndroidRuntime(12422): Process: com.example.androidhive, PID: 12422
        07-30 01:03:49.048: E/AndroidRuntime(12422): java.lang.RuntimeException: An error occured while executing doInBackground()
        07-30 01:03:49.048: E/AndroidRuntime(12422): at android.os.AsyncTask$3.done(AsyncTask.java:300)
        07-30 01:03:49.048: E/AndroidRuntime(12422): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
        07-30 01:03:49.048: E/AndroidRuntime(12422): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
        07-30 01:03:49.048: E/AndroidRuntime(12422): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
        07-30 01:03:49.048: E/AndroidRuntime(12422): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        07-30 01:03:49.048: E/AndroidRuntime(12422): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        07-30 01:03:49.048: E/AndroidRuntime(12422): at java.lang.Thread.run(Thread.java:841)
        07-30 01:03:49.048: E/AndroidRuntime(12422): Caused by: java.lang.NullPointerException
        07-30 01:03:49.048: E/AndroidRuntime(12422): at com.example.androidhive.NewProductActivity$CreateNewProduct.doInBackground(NewProductActivity.java:99)
        07-30 01:03:49.048: E/AndroidRuntime(12422): at com.example.androidhive.NewProductActivity$CreateNewProduct.doInBackground(NewProductActivity.java:1)

        • Seems you have php errors. Ht the urls from postman to see the errors (php error reporting)

          • Sicnarf Omsare

            Hi Ravi.. after using the postman on create_product file postman say’s {“success”: 0, “message” : “Required field(S) is missing”}

            On my logcat it points out
            Error Parsing data.org.json.JSONException: Value<!DOCTYPE of type java.lang.String cannot be converted to JSONObject

            It points out on CreateNewProduct.doInBackground in line 99

            Which is
            Log.d("Create Response", json.toString());

            I think almost everyone got the same issue on the CreateNewProduct as well as the GetAllProducts

          • Check raw response in postman. There might be php errors.

          • Sicnarf Omsare

            Ive seen the problem Ravi, thats why the parser returns<!Doctype because the response in postman is this: https://uploads.disquscdn.com/images/94252f1fcb6c7b871c248f31ff63799c7228e8196d4f25f644faacb388a61842.png

            the warning causes the response to throw an error,..

            It say Deprecated mysql functions

  • Kishan Yadav

    What will we place at the place of URL
    // single product url
    private static final String url_product_detials = “https://api.androidhive.info/android_connect/get_product_details.php”;

    // url to update product
    private static final String url_update_product = “https://api.androidhive.info/android_connect/update_product.php”;

    // url to delete product
    private static final String url_delete_product = “https://api.androidhive.info/android_connect/delete_product.php”;

  • Syed Adib

    Hi Ravi! I got a question. Instead of displaying at listview, can I display the data in a textview?can you share the code to do so?

  • Pau Chittaro

    Hello Ravi, i found this tutorial extremely useful. I have a question, what are the asyncTask String parameters for? Has to do anything with the name, price, description?

  • Pau Chittaro

    I’ve got another problem. In the create_product file, the isset condition for the variables in the if loop are never true. I get {“success”:0,”message”:”Required field(s) is missing”}.
    Actually, none of the fields are missing, but it seems that i can’t successfully set the values for the variables.
    I tried print_r ($_POST); but all i get is: Array(), i saw a lot of people had this problem, but i couldn’t get anything helpful to solve the problem. I’ve been stacked with this a lot of time. I hope you can help me! Thanks!

    • Antigoni Karabillie

      Hello. I have the same problem. Did you find the solution?

  • Malacosh

    Hello, the app closes instantly after opening it, any idea why? i get no errors when i try start the app. Thanks

    PS: I try to start the app on my Phone (HTC One M9)

  • adminanto

    Thanks again for well written article.

    This is exactly I need for. After fix some errors, finally I can run it in AVD.
    But application just crash everytime sistem call any function, such as view products or add new products.
    With dummy data I’ve added to the table, still the app crash when click on view products button.

    Any Idea?

  • Sicnarf Omsare

    Since the mysql functions were deprecated the response would be html type thats why everybody got those errors

    • Danish Bawany

      can you plz mention here which codes need to change

  • Swapnil

    Hi Mr. Ravi,

    Actually i wanted to learn database connectivity using php and mysql in android so tried the above code but i am getting errors in the following activities 1.NewProductActivity.java and 2.EditProductActivity.java
    (in doInBackground method) it is saying that

    Method getText must be called from the UI thread, currently inferred thread is worker

    Here is the code EditProductActivity.java
    class SaveProductDetails extends AsyncTask{

    @Override
    protected void onPreExecute() {
    super.onPreExecute();
    super.onPreExecute();
    pDialog = new ProgressDialog(EditProductActivity.this);
    pDialog.setMessage(“Saving product …”);
    pDialog.setIndeterminate(false);
    pDialog.setCancelable(true);
    pDialog.show();

    }
    @Override
    protected String doInBackground(String… args) {

    String name = txtName.getText().toString();
    String price = txtPrice.getText().toString();
    String description = txtDesc.getText().toString();

    List params = new ArrayList();
    params.add(new BasicNameValuePair(TAG_PID,pid));
    params.add(new BasicNameValuePair(TAG_NAME,name));
    params.add(new BasicNameValuePair(TAG_PRICE,price));
    params.add(new BasicNameValuePair(TAG_DESCRIPTION,description));

    JSONObject json = JSONParser.makeHttpRequest(url_update_product,”POST”,params);

    try {
    int success = json.getInt(TAG_SUCCESS);

    if (success == 1){
    Intent i = getIntent();
    setResult(100,i);
    finish();
    }else{
    Toast.makeText(getApplicationContext(),”Failed to save product details, Try Again!!!”,Toast.LENGTH_LONG).show();
    }
    } catch (JSONException e) {
    e.printStackTrace();
    }
    return null;
    }

    __________________________________________________________________________________________________________________________________________________________________________

    NewProductActivity.java

    class CreateNewProduct extends AsyncTask{
    @Override
    protected void onPreExecute() {
    super.onPreExecute();
    pDialog = new ProgressDialog(NewProductActivity.this);
    pDialog.setMessage(“Creating Product..”);
    pDialog.setIndeterminate(false);
    pDialog.setCancelable(true);
    pDialog.show();
    }
    @Override
    protected String doInBackground(String… args) {

    String name = inputName.getText().toString();
    String price = inputPrice.getText().toString();
    String description = inputDesc.getText().toString();

    List params = new ArrayList();
    params.add(new BasicNameValuePair(“name”,name));
    params.add(new BasicNameValuePair(“price”,price));
    params.add(new BasicNameValuePair(“description”,description));

    JSONObject json = jsonParser.makeHttpRequest(url_create_product,”POST”,params);

    Log.d(“Create Responnce”,json.toString());

    try {
    int success = json.getInt(TAG_SUCCESS);

    if (success == 1){

    Intent i = new Intent(getApplicationContext(),AllProductsActivity.class);
    startActivity(i);

    finish();
    }else {
    Toast.makeText(getApplicationContext(),”Failed to create product,Try Again”,Toast.LENGTH_LONG).show();
    }
    } catch (JSONException e) {
    e.printStackTrace();
    }

    return null;
    }

    how to resolve this error.

    Thanks in Advance.
    Swapnil Janrao.
    you can find me at swapneel.janrao@gmail.com

  • Antigoni Karabillie

    Thank you. Can u suggest any tutorial for PDO because I am a beginner? Thanks!

    • Pau Chittaro

      Mmm… didn’t use any specific tutorial to make that file, just the PDO documentation from the PHP website.
      But there are a lot of tutorials and documentation available searching in google.

      • Sicnarf Omsare

        Hi Pau, can you post your connect.php code that uses PDO? thanks,

  • Kit

    Dear,
    i tried above code into android studio. and list product and add product is work. but the get product detail can’t run. i think the problem is allproductactivity can’t send the “pid” to editproductactivity. i tried create new activity for receive the “pid”. But still fail. So i think the “pid” is not send to editproductactivity.

    • You can echo the post / get params in php script to see if they are actually received or not.

      • Kit

        i tried use toast show the “pid” into listproduct activity is ok. and then, i tried create new activity to receive the “pid”. but still fail.

  • prashu Gupta

    http://localhost/phpmyadmin/ wants to be login,what can i do

  • Leopoldo CAstro

    Hola que tal mi nombre es leo castro soy diseñador de aplicaciones android novato y solicito de tu ayuda para una aplicacion basada en coordenas lo que necesito es que me muestre mi ubicacion actual y queme permita gusrdar los datos en un grid para poderlos posteriormente pasarlos a google map y tener mi ruta de clientes georeferenciada me podrias ayudar mi correo es leopoldo.ernestoc@gmail.com whatsapp +50377486783

  • Check your code. You are calling some node by using 'product' node name which is not there. I am assuming its 'products'

  • Sicnarf Omsare

    Hi Pau, can you post your connect.php code that uses PDO? thanks, Also I got syntax error in your code, thanks btw

  • Sicnarf Omsare

    Hi Ravi, can you post the php with PDO functions since mysql is deprecated… thanks

  • Danish Bawany

    hi,
    i want to know 2 things.
    1. instead of setting up php on my own lappy i want to do it completely on my website , can you please guide me which code i need to change
    2. if i do all in android studio which things i need to do.
    thanks 🙂

  • Chastity

    Hello, i would like to know if i can run the same code on netbeans and android studio?
    thanks in advance 🙂

    • Why you want to use Netbeans for this?

      • Chastity

        Because im more comfortable working with netbeans over eclipes. But it’s okay, android studio?

        • Android Studio is strongly suggested for android. Netbeans is not good for android development.

          • Chastity

            okay thank you

          • You are welcome 🙂

  • sirisha karnati

    hello,
    how to send data messages of having any changes in mysql database can send notification to android app without using firebase console and php backend

    • You can use nodejs and socket io to send notifications.

      • sirisha karnati

        can u please send me the code of how to send data messages of having any changes in mysql database can send notification to android app without using firebase console and php coding.
        can u send the code of node js and socket io

      • Henry Ejemuta

        I would appreciate a guide on this if it is more efficient that draining user device resource for checking over and over again.

        Thanks in advance

  • sirisha karnati

    can u please send me the code of how to send data messages of having any changes in mysql database can send notification to android app without using firebase console and php coding.
    can u send the code of node js and socket io

  • Akshay

    Plz send me the updated code for the error as “Method getText must be called from the UI thread, currently inferred thread is worker” in your code.
    at akshaygayale@gmail.com

  • Henry Ejemuta

    I’m just starting off with android and your tutorials has been helpful… Thanks alot..
    I tried using this tutorial and a couple of classes in the JSONParser are deprecated without any hint on alternatives.. I would appreciate if you could review the class an make recommendations.

    Thanks in Advance! https://uploads.disquscdn.com/images/c2fe8620aed01da1157f66bfd96cff29e7b31f78a76444322e4504b3f0d18a7d.png