Friday, March 30, 2012

Android MySQL Client (Part 1)

This is a simple implementation of Android MySQL connection. The idea is to read data from a MySQL database through the internet using a simple Android application & a java web service.

Program has three main parts.
1. Database table(MySQL)
2. Java web service.
3. Android application.

Concept is simple, Java web service deployed on Tomcat server has a method which can run a quarry on database to retrieve data & this method returns results as a string output. To connect web service & database I have used JDBC bridge.
The Android application calls that web service method remotely using ksoap library. Then web service runs a query on database table to retrieve data & returns data as a string to Android app. Android app display this data.

1. Creating the database.

First we need to create a new database & customer table. We will access customer table in Android application. In order to create database & customer table run following sql queries.
1. Create the database
CREATE DATABASE retailer;
2.Create table customers
CREATE TABLE customers(
name varchar(20),
C_ID int NOT NULL AUTO_INCREMENT,
address  varchar(20),
email varchar(50),
PRIMARY KEY(C_ID)
);
3. Populate the database
INSERT INTO customers(name,address,email)
VALUES ('Chathura','221B,Akuressa','priyankarahac@gmail.com');
Here I have used auto increment customer ID & it is the primary key of the table. I'm going read data from customer table where C_ID has maximum value.


2. Java web service

package com.retailer.ws;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.PreparedStatement;

public class RetailerWS {
 public String customerData(){
  String customerInfo = "";
  try{
  Class.forName("com.mysql.jdbc.Driver");
  Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/retailer","root","chathura");
  //Find customer information where the customer ID is maximum
  PreparedStatement statement =  con.prepareStatement("SELECT * FROM customers WHERE C_ID = (SELECT MAX(C_ID) FROM customers)");
  ResultSet result = statement.executeQuery();
  
   while(result.next()){
    customerInfo = customerInfo + result.getString("name") + "&" + result.getString("C_ID") + "&"+result.getString("address") + "&"+result.getString("email");
  //Here "&"s are added to the return string. This is help to split the string in Android application 
   }
  }
  
  catch(Exception exc){
   System.out.println(exc.getMessage());
   }
  
  return customerInfo;
  }

}
This java web service has JDBC connector to access the database. Click here to download the connector.Import JDBC connector to your project. This tutorial is about importing the ksaop library. In the same way you can import JDBC library also. It is simple
You can implement the web service easily by following my these
1. Create java web service in Eclipse using Axis2 (Part 01) 
2. Create java web service in Eclipse using Axis2 (Part 02) 

3. Android application.

The Android application uses ksoap2 library to access java web service. You can find More details about implementation of Android client applications from here. If you are planning to use new Android version read this tutorial.

Here is the code for Android application.
package com.retailer.client;

import android.app.Activity;
import android.os.Bundle;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.widget.TextView;

public class RetailerActivity extends Activity {
    private static final String SOAP_ACTION = "http://ws.retailer.com/customerData";
    private static final String METHOD_NAME = "customerData";
    private static final String NAMESPACE = "http://ws.retailer.com/";
    private static final String URL = "http://175.157.234.156:8085/ForBlog/services/RetailerWS?wsdl";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);  
        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
         
        envelope.setOutputSoapObject(request);
 
        HttpTransportSE ht = new HttpTransportSE(URL);
        try {
            ht.call(SOAP_ACTION, envelope);
            SoapPrimitive response = (SoapPrimitive)envelope.getResponse();
            SoapPrimitive s = response;
            String str = s.toString();
            String resultArr[] = str.split("&");//Result string will split & store in an array
           
            TextView tv = new TextView(this);
      
            for(int i = 0; i<resultArr.length;i++){
            tv.append(resultArr[i]+"\n\n");
           }
            setContentView(tv);
   
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Result :



The Android application shows details about the customer which has maximum customer ID

Database table :


You can download updated Android project here . Password : tomcat  
You can download webservice project here. Password : tomcat

This tutorial demonstrate how we can insert data to a MySQL database using an Android application.
If you find this post helpful don't forget to leave a comment. your comments encourage me to write more!

91 comments:

  1. I want connect android to web service but the issue error.
    - Could not find class 'org.ksoap2.serialization.SoapObject', referenced from method service.android.service.ReceiveData

    ReplyDelete
    Replies
    1. Create a directory named lib in your project root and paste ksoap2 jar file to lib directory. Then add ksoap2 to your java build path.

      Delete
    2. Still the problem persists. What can be done?

      Delete
    3. I tried same code with web service using netBeans Ide but i am getting getting exceptions and in return statement the string taking which is we initialized starting like here space(" ")
      and returning space value i don't know why i getting like that

      Delete
  2. Very nice tutorials.In my mac system your application is downloaded but it is not opened..it is getting error...so please post me main.xml file.

    ReplyDelete
  3. i want to get data as a list from mysql database when i clicked a button. how to do.i am a beginner for android app development.so will plz help me n show me the code with result.

    ReplyDelete
    Replies
    1. First you need to store data retrieved from the database in an array, Then you can easily add array elements to a list view. For more details please contact me on priyankarahac@gmail.com

      Delete
  4. superb macha.... keep it up!!!

    ReplyDelete
  5. machan, i got an exception in class RetailerWS.. its the db connection error i guess..("System.out.println(exc.getMessage());")<< this exception.

    I entered the mysql username and password properly.
    I used phpmyadmin to create and to populate the db (hope it won't be a problem)
    so machan,if you can please help me to solve this thing.. :(

    ReplyDelete
    Replies
    1. Can you please send me the error stack trace... my gmail id is priyankarahac

      Delete
  6. HI!) thanks for tutorial!)
    I tried to make app like this. but I have some problem and I don`t known a solution.
    I did all steps that you had recommended. I added driver, ksoap2 lib.
    Web service works good. Get data from db.
    Android app don`t get this data.
    I will be grateful.:)


    there are my logCat with ERRORS:

    07-10 19:16:35.393: E/vold(27): Error opening switch name path '/sys/class/switch/test' (No such file or directory)
    07-10 19:16:35.393: E/vold(27): Error bootstrapping switch '/sys/class/switch/test' (No such file or directory)
    07-10 19:16:35.393: E/vold(27): Error opening switch name path '/sys/class/switch/test2' (No such file or directory)
    07-10 19:16:35.393: E/vold(27): Error bootstrapping switch '/sys/class/switch/test2' (No such file or directory)
    07-10 19:17:38.843: E/BatteryService(66): usbOnlinePath not found
    07-10 19:17:38.843: E/BatteryService(66): batteryVoltagePath not found
    07-10 19:17:38.853: E/BatteryService(66): batteryTemperaturePath not found
    07-10 19:17:38.893: E/SurfaceFlinger(66): Couldn't open /sys/power/wait_for_fb_sleep or /sys/power/wait_for_fb_wake
    07-10 19:18:28.363: E/EventHub(66): could not get driver version for /dev/input/mouse0, Not a typewriter
    07-10 19:18:28.363: E/EventHub(66): could not get driver version for /dev/input/mice, Not a typewriter
    07-10 19:18:29.246: E/System(66): Failure starting core service
    07-10 19:18:29.246: E/System(66): java.lang.SecurityException
    07-10 19:18:29.246: E/System(66): at android.os.BinderProxy.transact(Native Method)
    07-10 19:18:29.246: E/System(66): at android.os.ServiceManagerProxy.addService(ServiceManagerNative.java:146)
    07-10 19:18:29.246: E/System(66): at android.os.ServiceManager.addService(ServiceManager.java:72)
    07-10 19:18:29.246: E/System(66): at com.android.server.ServerThread.run(SystemServer.java:176)
    07-10 19:18:29.263: E/AndroidRuntime(66): Crash logging skipped, no checkin service
    07-10 19:18:51.450: E/ActivityThread(119): Failed to find provider info for android.server.checkin
    07-10 19:18:54.419: E/ActivityThread(119): Failed to find provider info for android.server.checkin
    07-10 19:18:54.819: E/ActivityThread(119): Failed to find provider info for android.server.checkin
    07-10 19:18:55.749: E/ActivityThread(119): Failed to find provider info for android.server.checkin
    07-10 19:18:55.970: E/ActivityThread(119): Failed to find provider info for android.server.checkin
    07-10 19:19:13.078: E/AndroidRuntime(163): ERROR: thread attach failed
    07-10 19:19:22.439: E/AndroidRuntime(212): ERROR: thread attach failed

    ReplyDelete
    Replies
    1. Please mail your Android project, I'll check (priyankarahac@gmail.com)

      Delete
  7. I want to access data from mysql database which is located on server.then where to deploy the web service on my machine or on server machine?
    Please reply soon!!

    ReplyDelete
    Replies
    1. Place web service on the server, but your server must support for java web services.

      Delete
  8. thanx a lot bro!!

    ReplyDelete
  9. i tried your tutorial but nothing is returned to ANDROID .MYsql gets connected data is fetched but only return is a problem
    AND when i use soapPrimitive it gives ClassCastException and when i change it to SoapObject it returns me anyType(); .
    if i return a simple string every thing just goes fine.
    I couldnt figure out as much could u suggest me something please......

    ReplyDelete
    Replies
    1. I am getting the same result. It returns me anytype(). Were you able to resolve it?

      Delete
  10. Nice tutorial

    http://pavanhd.blogspot.in/

    ReplyDelete
  11. Fantastic example bro.........
    It really help me a lot..........
    Thank u so much.........

    ReplyDelete
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  50. STEP BY STEP ANDROID TUTORIALS

    VISIT:www.androidituts.blogspot.com

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  51. Hi am new in android development , i want to make an android " client server app " that allow student to know his semester result by entering his index number via android phone .

    here is more explanation for what i want :

    http://www.fileden.com/files/2012/8/28/3341857/Android%20Assignment.docx

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  52. Hello Chathura I am getting System error Called "android.os.NetworkOnMainThreadException"
    Its related to SyncThread ..Currently I am using Android version 4.1
    Please help me ..

    ReplyDelete
    Replies
    1. Please look at this tutorial
      http://codeoncloud.blogspot.com/2013/07/android-web-service-access-using-async.html

      Delete
  53. I have created database in phpmyadmin..How can i connect it with my android application..Thanks in advance.

    ReplyDelete
  54. I have created my Db in phpMyadmin..How can i connect my app with it..any tutorials? Thanks in advance

    ReplyDelete
    Replies
    1. You need to have a web service which acts as a middle layer and responsible for fetching data from the database. This web service can be created in any language you prefer.

      Delete
  55. Thanks for this tutorial, while i display bulk of records from table means what i do. Exactly When i use ARRAYLIST in web service means how can i use in android.

    ReplyDelete
  56. Hi, I'm new developing Apps. How do I get the following parameters:

    SOAP_ACTION, NAMESPACE and URL.

    Thanks for your help.

    ReplyDelete
    Replies
    1. URL is the link for your WSDL. You have to open the targeted WSDL first which defines the web service that you are going to access. In that WSDL you can find SOAP_ACTION, NAMESPACE. You can see a example WSDL here :::

      http://2.bp.blogspot.com/-Rxhr4ua9gIU/Ucka5tYud8I/AAAAAAAAATg/74mIq5KOcZQ/s1600/Android+java+web+service+access01.PNG

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  57. Hi, I'm new at programming. Can you please tell me where did you take SOAP_ACTION, NAMESPACE and URL?

    Thanks!

    ReplyDelete
  58. This is working in emulator ,but not in android device.I have used public IP instead of local host ,so from external browser the wsdl file is opening(since the public IP has been translated to my local IP),but application is not running.Please help.

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  64. I am using a dot net webservice..but when i run it i am getting this
    Hello World RetailerActivity..nothing from my web service..where am i going wrong??
    package com.retailer.client;

    import android.app.Activity;
    import android.os.Bundle;
    import org.ksoap2.SoapEnvelope;
    import org.ksoap2.serialization.SoapObject;
    import org.ksoap2.serialization.SoapPrimitive;
    import org.ksoap2.serialization.SoapSerializationEnvelope;
    import org.ksoap2.transport.HttpTransportSE;
    import android.widget.TextView;

    public class RetailerActivity extends Activity {
    private static final String SOAP_ACTION = "http://tempuri.org/";
    private static final String METHOD_NAME = "GetEmployessXML";
    private static final String NAMESPACE = "http://tempuri.org/";
    private static final String URL = "http://my machine ip/WS/Service.asmx?wsdl";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
    envelope.dotNet = true;
    envelope.setOutputSoapObject(request);

    HttpTransportSE ht = new HttpTransportSE(URL);
    try {
    ht.call(SOAP_ACTION, envelope);
    SoapPrimitive response = (SoapPrimitive)envelope.getResponse();
    SoapPrimitive s = response;
    String str = s.toString();
    String resultArr[] = str.split("&");//Result string will split & store in an array

    TextView tv = new TextView(this);

    for(int i = 0; i<resultArr.length;i++){
    tv.append(resultArr[i]+"\n\n");
    }
    setContentView(tv);

    } catch (Exception e) {
    e.printStackTrace();
    }
    }
    }

    ReplyDelete
  65. Well it supposes that there's a website, wich is the MySQL client. Your Android application is not a MySQL client, it is a "web client"..

    ReplyDelete
  66. Thanks for sharing your info. I really appreciate your efforts and I will be waiting for your further write
    Kizi 123|
    Friv 234|
    Friv|

    ReplyDelete
  67. How to connect google cloud sql to android eclipse??

    ReplyDelete