get data from database and display it on android application

Question

I have design my database on MySQL and link it through php. how can i get it on android application by using HTTP GET method??? i used JSON Parsing for this purpose to get data from MYSQL but i fails to display:(( Now i want to get data from HTTP GET request so how can i use it?? does i upload my database on server??? how can i upload it?? and what is the method for it. i'll be thankful to you for help

MySQL database is:

    <?php
// read_My_Task.php


/*
 * Following code will get single task details
 * A task_detail is identified by task id (cid)
 */
 // 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["cid"])) {
    $cid = $_GET['cid'];

    // get a task from my-task table
    $result = mysql_query("SELECT *FROM my_task WHERE cid = $cid");

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

            $result = mysql_fetch_array($result);

            $my_task = array();
            $my_task["cid"] = $result["cid"];
            $my_task["cus_name"] = $result["cus_name"];
            $my_task["contact_number"] = $result["contact_number"];
            $my_task["ticket_no"] = $result["ticket_no"];
            $my_task["task_detail"] = $result["task_detail"];

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

            array_push($response["my_task"], $my_task);
            // echoing JSON response
            echo json_encode($response);         
             }            

        else {
            // no task found
            $response["success"] = 0;
            $response["message"] = "No task found";

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

?>

LogCat errors are:

12-17 11:00:39.180: W/System.err(10667): org.apache.http.conn.ConnectTimeoutException: Connect to /198.168.0.29:80 timed out
12-17 11:00:39.180: W/System.err(10667):    at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121)
12-17 11:00:39.180: W/System.err(10667):    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
12-17 11:00:39.180: W/System.err(10667):    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
12-17 11:00:39.180: W/System.err(10667):    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
12-17 11:00:39.180: W/System.err(10667):    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:359)
12-17 11:00:39.180: W/System.err(10667):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
12-17 11:00:39.180: W/System.err(10667):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
12-17 11:00:39.180: W/System.err(10667):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
12-17 11:00:39.180: W/System.err(10667):    at com.example.visit.record.JSONParser.makeHttpRequest(JSONParser.java:62)
12-17 11:00:39.180: W/System.err(10667):    at com.example.visit.record.My_Task$GetTaskDetails.doInBackground(My_Task.java:170)
12-17 11:00:39.180: W/System.err(10667):    at com.example.visit.record.My_Task$GetTaskDetails.doInBackground(My_Task.java:1)
12-17 11:00:39.180: W/System.err(10667):    at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-17 11:00:39.180: W/System.err(10667):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
12-17 11:00:39.180: W/System.err(10667):    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
12-17 11:00:39.180: W/System.err(10667):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
12-17 11:00:39.180: W/System.err(10667):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
12-17 11:00:39.190: W/System.err(10667):    at java.lang.Thread.run(Thread.java:1027)
12-17 11:00:39.190: E/Buffer Error(10667): Error converting result java.lang.NullPointerException
12-17 11:00:39.190: E/JSON Parser(10667): Error parsing data org.json.JSONException: End of input at character 0 of 
12-17 11:00:39.190: W/dalvikvm(10667): threadid=9: thread exiting with uncaught exception (group=0x400205a0)
12-17 11:00:39.200: E/AndroidRuntime(10667): FATAL EXCEPTION: AsyncTask #1
12-17 11:00:39.200: E/AndroidRuntime(10667): java.lang.RuntimeException: An error occured while executing doInBackground()
12-17 11:00:39.200: E/AndroidRuntime(10667):    at android.os.AsyncTask$3.done(AsyncTask.java:200)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at java.lang.Thread.run(Thread.java:1027)
12-17 11:00:39.200: E/AndroidRuntime(10667): Caused by: java.lang.NullPointerException
12-17 11:00:39.200: E/AndroidRuntime(10667):    at com.example.visit.record.My_Task$GetTaskDetails.doInBackground(My_Task.java:174)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at com.example.visit.record.My_Task$GetTaskDetails.doInBackground(My_Task.java:1)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-17 11:00:39.200: E/AndroidRuntime(10667):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
12-17 11:00:39.200: E/AndroidRuntime(10667):    ... 4 more
12-17 11:00:39.510: E/WindowManager(10667): Activity com.example.visit.record.My_Task has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4054caf0 that was originally added here
12-17 11:00:39.510: E/WindowManager(10667): android.view.WindowLeaked: Activity com.example.visit.record.My_Task has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4054caf0 that was originally added here
12-17 11:00:39.510: E/WindowManager(10667):     at android.view.ViewRoot.<init>(ViewRoot.java:277)
12-17 11:00:39.510: E/WindowManager(10667):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
12-17 11:00:39.510: E/WindowManager(10667):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
12-17 11:00:39.510: E/WindowManager(10667):     at android.view.Window$LocalWindowManager.addView(Window.java:433)
12-17 11:00:39.510: E/WindowManager(10667):     at android.app.Dialog.show(Dialog.java:288)
12-17 11:00:39.510: E/WindowManager(10667):     at com.example.visit.record.My_Task$GetTaskDetails.onPreExecute(My_Task.java:149)
12-17 11:00:39.510: E/WindowManager(10667):     at android.os.AsyncTask.execute(AsyncTask.java:391)
12-17 11:00:39.510: E/WindowManager(10667):     at com.example.visit.record.My_Task.onCreate(My_Task.java:108)
12-17 11:00:39.510: E/WindowManager(10667):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
12-17 11:00:39.510: E/WindowManager(10667):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785)
12-17 11:00:39.510: E/WindowManager(10667):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1842)
12-17 11:00:39.510: E/WindowManager(10667):     at android.app.ActivityThread.access$1500(ActivityThread.java:132)
12-17 11:00:39.510: E/WindowManager(10667):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
12-17 11:00:39.510: E/WindowManager(10667):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-17 11:00:39.510: E/WindowManager(10667):     at android.os.Looper.loop(Looper.java:143)
12-17 11:00:39.510: E/WindowManager(10667):     at android.app.ActivityThread.main(ActivityThread.java:4268)
12-17 11:00:39.510: E/WindowManager(10667):     at java.lang.reflect.Method.invokeNative(Native Method)
12-17 11:00:39.510: E/WindowManager(10667):     at java.lang.reflect.Method.invoke(Method.java:507)
12-17 11:00:39.510: E/WindowManager(10667):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-17 11:00:39.510: E/WindowManager(10667):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-17 11:00:39.510: E/WindowManager(10667):     at 

it gives error:

Status Code: 404 Not Found
Accept-Ranges: bytes
Content-Language: en
Content-Type: text/html; charset=iso-8859-1
Date: Mon, 17 Dec 2012 06:40:56 GMT
Keep-Alive: timeout=5, max=100
Proxy-Connection: Keep-Alive
Server: Apache/2.2.17 (Win32) mod_ssl/2.2.17 OpenSSL/0.9.8o PHP/5.3.4 mod_perl/2.0.4 Perl/v5.10.1
Transfer-Encoding: chunked
Vary: accept-language,accept-charset


Method: POST
URL: http://192.168.0.29/mobile/read_mytask.php?cid=1
Body: 
cid=cid &
cus_name=c
& contact_no=n
& ticket_no=t
& taskdetail=td

Answer 1

I'll give you an overview on how client-server data retrieval works in Android. You can tailor it to your specific requirements from there since your question indicates large foundational knowledge gaps to me.

You'll have to create REST API's (by writing server side code using a language like PHP, Ruby, Python etc) that your Android app can consume to obtain the data from your MySQL database.

There are other options that avoid REST API's as well. See:

How to get from a MySql server to an Android app?

See here for a beginners tutorial on REST:

http://net.tutsplus.com/tutorials/other/a-beginners-introduction-to-http-and-rest/

Once you have your API's written. You can query them using HTTP GET request and parse the result. If you are returning the data in JSON format, here's a tutorial on how to parse it:

http://www.vogella.com/articles/AndroidJSON/article.html

Now you can store the parsed data on your local database using the native android methods. See db tutorial here:

http://www.vogella.com/articles/AndroidSQLite/article.html

Once all this is over. You can do CRUD operations on your local database to read/manipulate your data and display them to the user using the XML based Android UI.

Answer 2

public class JsonHelper 
{
    static String response = null;
    String jsonRes = "";
    public JSONObject JObj=null;
    public final static int GET = 1;
    public final static int POST = 2;

//  public final static String fullUrl = "http://10.0.2.2/fluentcmsonline/";

public JsonHelper()
    {

    }

    public JSONObject MakeJsonCall(String Url,int method)
    {
        return this.MakeJsonCall(Url, method, null);
    }

    public JSONObject MakeJsonCall(String Url,int method, List<NameValuePair> params)
    {
        try
        {
            DefaultHttpClient HttpClient = new DefaultHttpClient();
            HttpEntity httpentity = null;
            HttpResponse httprespo = null;
            if(method==POST)
            {
                 HttpPost httppost = new HttpPost(fullUrl+Url);
                //HttpPost httppost = new HttpPost(Url);
                if(params != null)
                {
                    httppost.setEntity(new UrlEncodedFormEntity(params));
                }

                httprespo = HttpClient.execute(httppost);
            }
            else
            {
                if(params != null)
                {
                    String paramString = URLEncodedUtils.format(params, HTTP.UTF_8);

                    Url += "?"+paramString;     
                }

                 HttpGet httpget = new HttpGet(fullUrl+Url);
                //HttpGet httpget = new HttpGet(Url);

                httprespo = HttpClient.execute(httpget);
            }
            httpentity = httprespo.getEntity();

            if(httpentity != null)
            {
                InputStream is = httpentity.getContent();
                BufferedReader buffer = new BufferedReader(new InputStreamReader(is,"UTF-8"),8);

                StringBuilder Sb = new StringBuilder();
                String Line = null;

                while((Line = buffer.readLine())!=null)
                {
                    Sb.append(Line+"\n");
                }
                is.close();
                jsonRes = Sb.toString();

            }

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

        try
        {
            JObj = new JSONObject(jsonRes);
            Log.e("Data", jsonRes);
        }
        catch(JSONException e)
        {
            e.printStackTrace();
        }

        return JObj;
    }

}